Jianmeng Chen

Zhejiang University of Technology, Hang-hsien, Zhejiang Sheng, China

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Publications (103)309.47 Total impact

  • Runye Zhu · Yubo Mao · Liying Jiang · Jianmeng Chen
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    ABSTRACT: A nonthermal plasma catalysis reactor was developed as pretreatment technology for a biotrickling filter (BTF), which was adopted to enhance removal of poorly soluble and recalcitrant volatile organic compounds. The performance of this pretreatment process was evaluated under various technological parameters, including discharge voltage, initial concentration, and residence time. Experimental results show that the system afforded higher efficiency of removal and selectivity to CO2 compared with those obtained with the control plasma process at discharge voltages of 5-9 kV and residence times of 3-15 s. Increasing the discharge voltage and residence time increased the removal efficiency. The activity of catalysts followed the order CeO2/HZSM-5 > CuO/MnO2 > Ag/TiO2. Furthermore, the solubility and biodegradability of degradation products were examined and analyzed. The main products of chlorobenzene degradation were O3, COx, benzene derivatives, and nitrogenous organics. The amounts of nitrogenous byproducts and O3 concentration during the reaction decreased significantly in the plasma catalysis reactor. This pretreatment technology greatly enhanced the solubility and biodegradability of byproducts. The results provide fundamental data for a feasible plasma catalytic system used as pretreatment technology for a BTF.
    Chemical Engineering Journal 11/2015; 279:463-471. DOI:10.1016/j.cej.2015.05.043 · 4.32 Impact Factor
  • Liying Jiang · Lu Liu · Shaodan Xiao · Jianmeng Chen
  • Liying Jiang · Shaodan Xiao · Jianmeng Chen
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    ABSTRACT: An amorphous Fe–Mn binary oxide adsorbent was developed using simultaneous oxidation and coprecipitation, and characterized by Brunauer–Emmett–Teller analysis, X-ray diffractometry, scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The removal behavior of the prepared absorbent for cobalt (II) was studied. Results showed that iron and manganese in adsorbent existed mainly in the +III and +IV oxidation states, respectively. The adsorbent exhibited the best depletion of Co(II) at pH 6–8, and the best removal ability at an ionic strength of 0.01 mmol L−1. The Freundlich isotherm model fitted the Co(II) adsorption data best. The FTIR spectra of the absorbent before and after Co(II) adsorption showed that the surface hydroxyl groups, Mn–OH and Fe–OH, existed at the surface and formed Mn–O–Co or Fe–O–Co. The iron oxide was the main adsorbent, and the manganese oxide also showed adsorption and oxidation ability. The XPS spectra confirmed that the Mn in the absorbent was reduced whereas the Fe showed no difference after reaction with Co(II). The XPS measurements of cobalt adsorbed on the adsorbent indicate that Co(II) has been oxidized to Co(III).
    Colloids and Surfaces A Physicochemical and Engineering Aspects 08/2015; 479. DOI:10.1016/j.colsurfa.2015.03.055 · 2.75 Impact Factor
  • Yijing Xia · Qizhou Dai · Jianmeng Chen
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    ABSTRACT: The novel nickel modified PbO2 electrodes were successfully prepared via electrodeposition in nitrate solution. The influence of nickel content on the physico-chemical properties and electrocatalytic performance of PbO2 electrodes was investigated. The electrodes were characterized by SEM, EDX and XRD techniques. A limited amount of doping nickel could produce a more compact PbO2 film and diminish the size of the crystal grains. The steady-state polarization curves and the cyclic voltammetry analysis showed that the 1% Ni–PbO2 electrode had the highest oxygen evolution potential and the optimal electrochemical oxidation ability. The cyclic voltammograms with various scan rates showed that the oxidation of aspirin on these PbO2 electrodes was a typical diffusion-controlled electrochemical process. Stability tests of different PbO2 electrodes showed that 1% Ni–PbO2 electrode had the highest electrochemical stability. In addition, nickel modified PbO2 electrodes were used to degradation aspirin in aqueous solution, which gave the direct evidence of the electrocatalytic capabilities of these electrodes. The results showed that 1% Ni–PbO2 electrode obtained the highest kinetic rate constant, chemical oxygen demand (COD) and total organic carbon (TOC) removals, which were 1.41, 1.22, 1.20 times than those of undoped PbO2 electrode, respectively. Moreover, the energy required for the treatment of 1 m3 aspirin solution significantly decreased and the hydroxyl radical utilization rate was enhanced after appropriate nickel doping. As a result, the 1% Ni–PbO2 electrode is a promising anode for the treatment of organic pollutants.
    Journal of electroanalytical chemistry 05/2015; 744. DOI:10.1016/j.jelechem.2015.01.021 · 2.73 Impact Factor
  • Qizhou Dai · Liling Chen · Wei Chen · Jianmeng Chen
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    ABSTRACT: This study aims to investigate degradation mechanisms and kinetics of phenoxyacetic acid by ozonation in aqueous solution. The optimized operating condition was achieved by phenoxyacetic acid and total organic carbon (TOC) removal based on the studies of the effects of various parameters, such as pH value (4–12), the initial concentration of phenoxyacetic acid (100–2000 mg L−1) and the ozone dosage (16–48 mg min−1). A series of intermediates were formed in the ozonation process and detected by GC/MS and HPLC analysis, such as phenyl formate, salicylic acid, phenol, oxalic acid and small molecule acids. A possible degradation pathway of phenoxyacetic acid was proposed. The kinetic analysis showed that phenoxyacetic acid degradation was in slow kinetic regime based on the results of Ha. This paper can provide basic data and theoretical reference for pharmaceutical wastewater treatment by ozonation.
    Separation and Purification Technology 03/2015; 142. DOI:10.1016/j.seppur.2014.12.045 · 3.09 Impact Factor
  • Jun Chen · Lei Wang · Ji Zheng · Jianmeng Chen
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    ABSTRACT: Chemical absorption-biological reduction (BioDeNOx), which uses Fe(II)(EDTA) as a complexing agent for promoting the mass transfer efficiency of NO from gas to water, is a promising technology for removing nitric oxide (NO) from flue gases. The carbon source and pH are important parameters for Fe(II)(EDTA)-NO (the production of absorption) reduction and N2O emissions from BioDeNOx systems. Batch tests were performed to evaluate the effects of four different carbon sources (i.e., methanol, ethanol, sodium acetate, and glucose) on Fe(II)(EDTA)-NO reduction and N2O emissions at an initial pH of 7.2 ± 0.2. The removal efficiency of Fe(II)(EDTA)-NO was 93.9 %, with a theoretical rate of 0.77 mmol L(-1) h(-1) after 24 h of operation. The highest N2O production was 0.025 mmol L(-1) after 3 h when glucose was used as the carbon source. The capacities of the carbon sources to enhance the activity of the Fe(II)(EDTA)-NO reductase enzyme decreased in the following order based on the C/N ratio: glucose > ethanol > sodium acetate > methanol. Over the investigated pH range of 5.5-8.5, the Fe(II)(EDTA)-NO removal efficiency was highest at a pH of 7.5, with a theoretical rate of 0.88 mmol L(-1) h(-1). However, the N2O production was lowest at a pH of 8.5. The primary effect of pH on denitrification resulted from the inhibition of nosZ in acidic conditions.
    Bioprocess and Biosystems Engineering 02/2015; 38(7). DOI:10.1007/s00449-015-1378-7 · 2.00 Impact Factor
  • Qizhou Dai · Liling Chen · Shijie Zhou · Jianmeng Chen
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    ABSTRACT: In this study, the kinetics and mechanism study of direct ozonation organics in aqueous solution was explored. Phenoxyacetic acid was selected as the model pollutant and ozonation experiments were performed in the bubble batch reactor in order to determine the rate constants for the direct reaction. Two kinetic methods were used for the determination of different kinetic rate constants (kapp and ki). The first group of the results showed the degradation of phenoxyacetic acid followed the pseudo-first-order kinetics. A simplified model related to the operational parameters on phenoxyacetic acid degradation was derived and the apparent rate constant kapp was obtained. The reaction was proved in the slow kinetics of gas-liquid reaction and the kinetic constant ki was built. The kapp and ki influenced by the pH value, the O3 dosage and the initial phenoxyacetic acid concentration were carefully analyzed.
    RSC Advances 02/2015; 5(31). DOI:10.1039/C4RA16681G · 3.84 Impact Factor
  • Jianmeng Chen · Yijing Xia · Qizhou Dai
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    ABSTRACT: This study presents an electrochemical method for the degradation of chloramphenicol (CAP) in aqueous solution with a novel Al doped PbO2 electrode. The Al-doped PbO2 electrode showed high electrochemical activity, oxygen evolution potential, radical utilization rate, reusability and safety. The influence factors on CAP degradation with the Al-doped PbO2 electrode were investigated in detail, and under the optimal conditions the removal rates of CAP and TOC reached 87.30% and 52.06% in acid conditions after 2.5 h electrolysis with a 0.2 mol dm−3 Na2SO4 at a current density of 30 mA cm−2, respectively. The electrochemical degradation of CAP at Al-doped PbO2 electrode electrode followed pseudo-first-order kinetics. The degradation mechanism was proposed by cyclic voltammograms tests and it was deduced that hydroxyl radicals generated in the electrochemical process played a key role in oxidizing CAP. Finally, based on the reaction products identified, a possible degradation pathway including radical reaction, ring open and mineralization was proposed.
    Electrochimica Acta 02/2015; 165. DOI:10.1016/j.electacta.2015.02.029 · 4.50 Impact Factor
  • Zhiqiao He · Lixian Jiang · Da Wang · Jianping Qiu · Jianmeng Chen · Shuang Song
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    ABSTRACT: A series of fluorinated anatase TiO2 nanosheets with dominant {001} facets were synthesized to oxidize p-chlorophenol (PCP) and reduce Cr(VI) simultaneously under visible light. The {001}/{101} surface facets ratio of TiO2 was controlled by varying the initial HF concentration, and fluorine-free samples were obtained by alkaline-washing. A synergistic effect among TiO2, Cr(VI), and PCP was observed, which is ascribed to effective trapping of photogenerated electrons and holes by Cr(VI) and PCP, respectively. A maximum synergistic effect was obtained at a molar ratio of [PCP] to [Cr(VI)] of one. Using X-ray diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller analyses, the optimum ratio of exposed {001} to {101} facets for TiO2 was determined to be 80:20 because of selective transfer and charge balance of photogenerated carriers. Surface fluorination facilitates the formation of oxygen vacancies and unsaturated Ti atoms, which is useful for visible light activity induction, extending the lifetime of photogenerated electron-hole pairs, and enhancing the rate of PCP oxidation and Cr(VI) reduction.
    Industrial & Engineering Chemistry Research 01/2015; 54(3):808-818. DOI:10.1021/ie503997m · 2.59 Impact Factor
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    Liying Jiang · Runye Zhu · Yubo Mao · Jianmeng Chen · Liang Zhang
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    ABSTRACT: The combination of chemical oxidation methods with biotechnology to removal recalcitrant VOCs is a promising technology. In this paper, the aim was to identify the role of key process parameters and biodegradability of the degradation products using a dielectric barrier discharge (DBD) reactor, which provided the fundamental data to evaluate the possibilities of the combined system. Effects of various technologic parameters like initial concentration of mixtures, residence time and relative humidity on the decomposition and the degradation products were examined and discussed. It was found that the removal efficiency of mixed VOCs decreased with increasing initial concentration. The removal efficiency reached the maximum value as relative humidity was approximately 40%-60%. Increasing the residence time resulted in increasing the removal efficiency and the order of destruction efficiency of VOCs followed the order styrene > o-xylene. Compared with the single compounds, the removal efficiency of styrene and o-xylene in the mixtures of VOCs decreased significantly and o-xylene decreased more rapidly. The degradation products were analyzed by gas chromatography and gas chromatography-mass spectrometry, and the main compounds detected were O3, COx and benzene ring derivatives. The biodegradability of mixed VOCs was improved and the products had positive effect on biomass during plasma application, and furthermore typical results indicated that the biodegradability and biotoxicity of gaseous pollutant were quite depending on the specific input energy (SIE).
    International journal of environmental research and public health 01/2015; 12(2):1334-50. DOI:10.3390/ijerph120201334 · 2.06 Impact Factor
  • Journal of The Electrochemical Society 01/2015; 162(10):E258-E262. DOI:10.1149/2.0351508jes · 3.27 Impact Factor
  • Xiangqian Wang · Chao Wu · Nan Liu · Sujing Li · Wei Li · Jianmeng Chen · Dongzhi Chen
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    ABSTRACT: A Pseudomonas sp. strain WL2 that is able to efficiently metabolize ethyl mercaptan (EM) into diethyl disulfide (DEDS) through enzymatic oxidation was isolated from the activated sludge of a pharmaceutical wastewater plant. One hundred percent removal of 113.5 mg L−1 EM and 110.3 mg L−1 DEDS were obtained within 14 and 32 h, respectively. A putative EM degradation pathway that involved the catabolism via DEDS was proposed, which indicated DEDS were further mineralized into carbon dioxide (CO2), bacterial cells, and sulfate (SO4 2−) through the transformation of element sulfur and ethyl aldehyde. Degradation kinetics for EM and DEDS with different initial concentrations by strain WL2 were evaluated using Haldane-Andrews model with maximum specific degradation rates of 3.13 and 1.33 g g−1 h−1, respectively, and maximum degradation rate constants of 0.522 and 0.175 h−1 using pseudo-first-order kinetic model were obtained. Results obtained that aerobic degradation of EM by strain WL2 was more efficient than those from previous studies. Substrate range studies of strain WL2 demonstrated its ability to degrade several mercaptans, disulfides, aldehydes, and methanol. All the results obtained highlight the potential of strain WL2 for the use in the biodegradation of volatile organic sulfur compounds (VOSCs).
    Applied Microbiology and Biotechnology 11/2014; 99(7). DOI:10.1007/s00253-014-6208-3 · 3.34 Impact Factor
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    ABSTRACT: In the present study, we investigated ozone-assisted photodegradation (UV254nm) of two common VOCs in a mixture, ethylbenzene (EB) and chlorobenzene (CB). Our results demonstrated that the photodegradation method was most efficient when ozone was introduced into the reaction system. When using this system, a significant combined effect from ozone and hydroxyl radicals was observed in the conversion of targets. The Cl radicals could suppress ozone and hydroxyl radical reactions, and thus the inhibition on EB conversion caused by higher relative humidity (RH) levels was not present. When the ratio of ozone to VOCs was 2 and RH was 75-80%, many lighter carbonyls (benzoic acid, benzaldehyde, formic acid, etc.) were observed. Under these conditions their contributions to the carbon mass balance was 43.2%. According to the toxicity results, the optimal reaction condition was the same as the condition which generated the largest amount of total organic carbon. Here, the main product was chlorophenol and thus must be controlled.
    Separation and Purification Technology 08/2014; 132:62–69. DOI:10.1016/j.seppur.2014.05.005 · 3.09 Impact Factor
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    Zhiqiao He · Da Wang · Huiying Fang · Jianmeng Chen · Shuang Song
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    ABSTRACT: Ag supported on AgIO3 (Ag/AgIO3 particles), a plasmonic photocatalyst, was synthesized through a facile solid-state ion-exchange procedure followed by reduction with hydrazine hydrate. The particles displayed high activity and stability in the photocatalytic conversion of CO2 to CH4 and CO using water vapor under visible-light irradiation (> 400 nm wavelength).
    Nanoscale 07/2014; 6(18). DOI:10.1039/C4NR02450H · 7.39 Impact Factor
  • Qizhou Dai · Jiayu Wang · Liling Chen · Jianmeng Chen
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    ABSTRACT: The degradation of p-acetamidophenol (APAP), which is a typical component in pharmaceuticals and personal care products (PPCPs), in aqueous solution by ozonation process was studied. The effects of factors that affected the reaction rate, including the initial concentration of APAP, pH value, and O3 dosage were investigated, and the degradation products and mechanism of ozonation were also discussed. The results showed that the degradation of APAP was affected by the initial concentration of APAP, pH value, and O3 dosage. The optimized degradation condition was observed at pH 12.0. Under the same condition, increasing the pH value and ozone dosage would improve the degradation efficiency of APAP, while the degradation rate of APAP increased as the initial concentration of APAP decreased. Under the conditions of pH 2.0-12.0, an ozone dosage of 16-64 mg min-1, a pollutant concentration of 200-3000 mg L-1, and a temperature of 25 °C, the degradation followed the pseudo-first-order kinetics. Moreover, the kinetic model was proposed with the function of C = C0 exp(−11.359QO31.3475C0-0.8487[OH-]0.0343t).
    Industrial & Engineering Chemistry Research 07/2014; 53(29):11593-11600. DOI:10.1021/ie501616r · 2.59 Impact Factor
  • Zhiqiao He · Lina Wen · Da Wang · Yijun Xue · Qianwen Lu · Cuiwei Wu · Jianmeng Chen · Shuang Song
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    ABSTRACT: Photocatalytic reduction of carbon dioxide can activate chemically inert carbon dioxide by the use of renewable energy. In the present work, the main products of photocatalytic reduction of CO2 in aqueous TiO2 suspensions were found to be methane, methanol, formaldehyde, carbon monoxide, and H2. Anatase TiO2 catalysts with various morphologies, such as nanoparticle, nanotube, and nanosheet, were synthesized through a hydrothermal method. The TiO2 nanosheets were more active than the nanotubes or nanoparticles in the reduction of CO2 in aqueous solution. This is because the photogenerated carriers prefer to flow to the specific facets. The TiO2 sheet with high-energy exposed {001} facets facilitates the oxidative dissolution of H2O with photogenerated holes, leaving more photogenerated electrons available for the reduction of CO2 on {101} facets. Moreover, surface fluorination promotes the formation of Ti3+ species, which is helpful in the reduction of CO2 to CO2– and in extending the lifetime of photogenerated electron–hole pairs. The optimum ratio of exposed {001} to {101} facets for surface-fluorinated TiO2 nanosheets was found to be 72:28, which corresponds to an initial F/Ti ratio of 1. From our analysis of the effect of adding of known intermediates on the photocatalytic reduction of CO2, we propose that the photocatalytic reduction of CO2 with H2O on surface-fluorinated TiO2 nanosheets proceeds via a mechanism involving generation of hydrogen radicals and carbon radicals.
    Energy & Fuels 06/2014; 28(6):3982–3993. DOI:10.1021/ef500648k · 2.79 Impact Factor
  • Qizhou Dai · Yijing Xia · Chen Sun · Mili Weng · Jun Chen · Jiade Wang · Jianmeng Chen
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    ABSTRACT: Electrochemical degradation of levodopa in aqueous solution was investigated over PbO2 electrode, La-PbO2 electrode, Gd-PbO2 electrode and La-Gd-PbO2 electrode. The degradation efficiencies of these four electrodes were investigated and it was found that the catalytic effect decreased in the following order: La-Gd-PbO2 electrode > La-PbO2 electrode > Gd-PbO2 electrode > PbO2 electrode. The main influencing factors on electrochemical decomposition of levodopa over La-Gd-PbO2 electrode were evaluated as a function of electrolyte concentration, initial levodopa concentration and current density. The results indicated that the maximum removal of levodopa, COD and TOC reached 100%, 79.20% and 65.31% respectively, after 120 min electrolysis at an initial 100 mg L-1 levodopa concentration at constant current density of 50 mA cm(-2) with a 0.1 mol L-1 Na2SO4 supporting electrolyte solution. The degradation mechanism of levodopa in electrochemical oxidation system is analyzed and a possible degradation pathway for the anodic oxidation of levodopa is proposed based on the intermediates identified. (C) 2014 Published by Elsevier B.V.
    Chemical Engineering Journal 06/2014; 245:359-366. DOI:10.1016/j.cej.2013.08.036 · 4.32 Impact Factor
  • Jianming Yu · Wenji Cai · Zhuowei Cheng · Jianmeng Chen
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    ABSTRACT: A strain Pandoraea pnomenusa LX-1 that uses dichloromethane (DCM) as sole carbon and energy source has been isolated and identified in our laboratory. The optimum aerobic biodegradation of DCM in batch culture was evaluated by response surface methodology. Maximum biodegradation (5.35 mg/(L·hr)) was achieved under cultivation at 32.8°C, pH 7.3, and 0.66% NaCl. The growth and biodegradation processes were well fitted by Haldane's kinetic model, yielding maximum specific growth and degradation rates of 0.133 hr−1 and 0.856 hr−1, respectively. The microorganism efficiently degraded a mixture of DCM and coexisting components (benzene, toluene and chlorobenzene). The carbon recovery (52.80%–94.59%) indicated that the targets were predominantly mineralized and incorporated into cell materials. Electron acceptors increased the DCM biodegradation rate in the following order: mixed > oxygen > iron > sulfate > nitrate. The highest dechlorination rate was 0.365 mg Cl−/(hr·mg biomass), obtained in the presence of mixed electron acceptors. Removal was achieved in a continuous biotrickling filter at 56%–85% efficiency, with a mineralization rate of 75.2%. Molecular biology techniques revealed the predominant strain as P. pnomenusa LX-1. These results clearly demonstrated the effectiveness of strain LX-1 in treating DCM-containing industrial effluents. As such, the strain is a strong candidate for remediation of DCM coexisting with other organic compounds.
    Journal of Environmental Sciences 05/2014; 26(5):1108–1117. DOI:10.1016/S1001-0742(13)60538-0 · 2.00 Impact Factor
  • Qizhou Dai · Jiayu Wang · Jun Chen · Jianmeng Chen
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    ABSTRACT: The catalyst of cerium supported on activated carbon (Ce/AC) for ozonation was prepared and the catalytic activity was evaluated by the degradation of p-toluenesulfonic acid (p-TSA). The results showed that Ce/AC catalyst could not only greatly enhance the degradation of p-TSA but also significantly increase the efficiency of COD removal by ozonation. The COD removal could reach 74.1% with the Ce/AC catalyst at 60 min, while the effects of activated carbon (AC) catalyst and without catalyst were only 62.4% and 50.8%, respectively. The superiority of Ce/AC catalyst was attributed to the fact that cerium increased the generation of hydroxyl radicals (OH), which could react with p-TSA and intermediate to form oxidized products rapidly. Based on the intermediates detected by GC/MS, IC and HPLC, a possible degradation pathway of p-TSA was proposed. Our aim is to provide basic data and theoretical support for pharmaceutical wastewater treatment by catalytic ozonation.
    Separation and Purification Technology 04/2014; 127:112–120. DOI:10.1016/j.seppur.2014.01.032 · 3.09 Impact Factor
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    ABSTRACT: Fe3O4 magnetic nanoparticles (MNPs) were employed for electro-Fenton (Fe3O4–electro-Fenton) degradation of C.I. Reactive Blue 19 (RB19) in an undivided electrochemical reactor with an activated carbon fiber felt cathode and a platinum anode. On the basis of physicochemical characterization of the Fe3O4 MNPs as well as quantitative measurements of iron leaching and H2O2 generation, it is concluded that the Fe3O4 MNPs facilitated the decomposition of H2O2 to generate hydroxyl radicals (•OH). Moreover, the cathodic electro-Fenton facilitated electro-regeneration of ferrous ion and maintained continuous supply of H2O2. The effect of several operational parameters such as pH, current density, amount of added Fe3O4 MNPs, initial RB19 concentration, and temperature on the removal of total organic carbon was investigated. It was found that the Fe3O4–electro-Fenton degradation of RB19 followed two-stage first-order kinetics with an induction period and a rapid degradation stage. Mineralization of RB19 proceeded rapidly only at pH 3.0. Increasing the current density and the dosage of Fe3O4 MNPs enhanced the rate of RB19 degradation. However, higher current densities and Fe3O4 dosages inhibited the reaction. The rate of RB19 degradation decreased with the increase in initial RB19 concentration and increased with the increase in temperature. The removal efficiency of total organic carbon reached 87.0% after 120 min of electrolysis at an initial pH of 3.0, current density of 3.0 mA/cm2, 1.0 g/L concentration of added Fe3O4 MNPs, 100 mg/L initial dye concentration, and 35 °C temperature. On the basis of the analytical results for the intermediate products and the assumption that •OH radicals are the major reactive species, we propose a possible pathway of RB19 degradation during the cathodic electro-Fenton process using Fe3O4 MNPs as iron source.
    Industrial & Engineering Chemistry Research 02/2014; 53(9):3435–3447. DOI:10.1021/ie403947b · 2.59 Impact Factor