Yangtao Wu

Yangtao Wu
Hunan University · Department of Water Science and Engineering

About

36
Publications
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517
Citations

Publications

Publications (36)
Article
For effective removal and recovery of carcinogenic hexavalent chromium (Cr(VI)), we synthesized sulfidated nanoscale zerovalent [email protected] polymeric substances ([email protected]) with the aim of combining the respective advantages of EPS and SnZVI. EPS was introduced during the synthesis of SnZVI and successfully covered SnZVI, resulting in...
Article
As a neurotoxin produced by cyanobacteria, 2,4-diaminobutyric acid (DAB) posed a significant threat to human health and served as an important precursor to disinfection by-products (DBPs). In this study, ClO2 showed the highest DAB oxidation efficiency among the four oxidants, in the order of ClO2 (86%) > HOCl (80%) > KMnO4 (20%) > NH2Cl (13%). The...
Article
UV/sodium percarbonate (UV/SPC) advanced oxidation process is an efficient and green technology to remove contaminants of emerging concern (CECs), with the simultaneous formation of hydroxyl radical (•OH) and carbonate radical (CO3•−). This study investigated the degradation of eight CECs in UV/SPC process, including phenol, atrazine, bisphenol A,...
Article
UV/chlorine is an emerging process that can simultaneously control waterborne bacteria and disinfection byproducts (DBPs). In this study, performance of UV365/chlorine process on bacterial inactivation was comprehensively investigated, which showed better performance than UV365 alone and chlorine alone processes. The better performance could be att...
Article
Pre-oxidation has been reported to be an effective way to remove algal cells in water, but the released algal organic matter (AOM) could be oxidized and lead to the increment in disinfection by-product (DBP) formation. The relationship between pre-oxidation and AOM-derived DBP formation needs to be approached more precisely. This study compared the...
Article
2,4-diaminobutyric acid (DAB) is a common non-protein amino acid with extremely high neurotoxicity in water environment, posing a serious threat to human health and animal welfare around the world. Therefore, it is necessary to take appropriate measures to remove it. In this paper, degradation of DAB in UV and UV/chlorine system were studied, and t...
Article
Eutrophication is a globally concerned issue, which brings algal cells and algal organic matter (AOM) into drinking water treatment plants. AOM is an important branch of nitrogenous disinfection byproduct (N-DBP) precursors. The variation of AOM composition in UV-LEDs/chlorine process, and its relationship with N-DBP formation still remain much unc...
Article
Iron-based materials, especially ferrous sulfide (FeS), effectively remediate chromium pollution. However, the agglomeration of FeS reduces its reactivity to chromium. Herein, carboxymethyl cellulose stabilized ferrous [email protected] polymeric substance ([email protected]) was developed to remove hexavalent chromium (Cr(VI)) from water. [email p...
Article
Simultaneous removal of chlorite (ClO2⁻) and organic micro-pollutants (OMPs) by the irradiation of UV is a novel process. In this study we used UV light emitting diode (UV-LED) as a new UV source to systematically investigate the effect of UV wavelength (255, 285, 365 nm) on the simultaneous removal of carbamazepine (CBZ) and ClO2⁻. Removal of both...
Article
Release of algal organic matter (AOM) from algae poses great threats to drinking water safety. As organic nitrogen in AOM is relatively higher compared to natural organic matter (NOM), the organic chloramine formation during chlorination cause overestimation of effective chlorine, which may lead to a biological risk. This study compared the organic...
Article
Organic chloramines of little disinfection efficacy commonly exist in disinfection process (chlor(am)ination) due to the wide presence of organic amines in water, of which N-chlorodimethylamine (CDMA) is a typical one. For the first time, UV photolysis for the activation of CDMA was investigated. UV photolysis caused the cleavage of N-Cl bond in CD...
Article
Epigallocatechin-3-gallate/peroxymonosulfate (EGCG/PMS) process was investigated as a process and evaluated for its performance to degrade emerging contaminants such as bisphenol S (BPS). Results showed that BPS degradation followed a two-stage kinetics process (i.e., a fast stage followed by a slow stage), and both stages obeyed the pseudo-first o...
Article
Copper ion (Cu²⁺), a common corrosion product released from copper pipes, is widely present in water distribution system (WDS). Cu²⁺ was confirmed to be capable to catalyze the decay of monochloramine (NH2Cl), which is a commonly used disinfectant and need to maintain a minimum concentration in WDS. Cu²⁺ and NH2Cl form a system in WDS and their int...
Article
Quantitative insight into the HCO3⁻-dependent degradation kinetics is critical to improve understanding of the UV processes for the most-cost effective application. In this study, we developed a kinetic model to precisely predict the kinetics in UV/H2O2 and UV/chlorine processes. The second-order rate constants of HO, Cl, ClO, Cl2⁻, and CO3⁻ with c...
Article
The wide application of nitrogenous fertilizers and herbicides in agricultural activities leads to the common co-existence of nitrate (NO3⁻) and diuron in agricultural runoffs, which are exposed to solar light irradiation. Previous studies reported that generation of reactive species and degradation of emerging contaminants can be induced by the ph...
Article
It is well known that using chlorine dioxide (ClO2) as a disinfectant inevitably produces a common disinfection byproducts chlorite (ClO2‒). In this study, we found that UV photolysis after ClO2 disinfection can effectively eliminate both ClO2‒ and contaminants of emerging concern (CECs). However, the kinetic mechanisms of UV/ClO2‒ process destruct...
Article
The ultraviolet (UV)/free chlorine process is a very promising treatment technology to remove persistent organic contaminants (POCs, e.g., pharmaceutical and personal care products) from water. The radical chain reactions involved in the UV/free chlorine process are very complicated, and the reaction pathways for organic contaminants degradation ar...
Article
The UV/monochloramine (NH2Cl) process is an advanced oxidation process that can effectively remove emerging contaminants (ECs). However, the degradation mechanisms of reactive radicals with ECs are not clear. In this work, we combined theoretical calculations with experimental studies to investigate the kinetics and mechanism of radical-mediated de...
Article
The study investigated the degradation kinetic and transformation mechanism of ibuprofen (IBP) in UV/H2O2 process from both experimental and theoretical aspects. Impacts of H2O2 dosage, solution pH, quenching agent, and concentration of nitrite (NO2⁻) on IBP degradation in UV/H2O2 process were evaluated. Both experimental results and theoretical ca...
Article
Chloramine under UV photolysis could not only produce the widely known hydroxyl radical (HO•) and reactive chlorine species (RCS; e.g., ClO•, Cl2•− and Cl•), but also produce reactive nitrogen species (RNS; e.g., •NH2, •NO and •NO2). In this study, the kinetic mechanisms, degradation products, N-Nitrosodimethylamine (NDMA) formation of RAN in the U...
Article
Advanced oxidation processes (AOPs) are ideal alternative to remove contaminants of emerging concern (CECs). Nitrate and nitrite commonly co-exist with CECs in surface water, groundwater, and agricultural runoffs, which impact the performance of AOPs. Interests in investigation on the impacts of nitrate/nitrite on CEC degradation in AOPs have grown...
Article
Accelerated oxidation of emerging contaminants by permanganate (PM) in the presence of reducing reagents or ligands was reported in previous studies. Epigallocatechin gallate (EGCG) is a novel reagent used in water treatment, with simultaneous reducing and chelating ability. Therefore, EGCG was applied to enhance PM oxidation of bisphenol A (BPA) i...
Article
Transition metals to activate peroxymonosulfate (PMS) has promising prospect to remove emerging organic contaminants, among which copper is an alternative because of its relatively high regulated concentration in drinking water and wide use of organic copper pesticide. Cu(I) shows good performance on the activation of PMS, while Cu(II) is reported...
Article
The presence of nitrite (NO2⁻) is inevitable with concentrations of several mg L⁻¹ in some typical water bodies. In this study, UV at wavelength of 365 nm was investigated to degrade contaminants of emerging concern (CECs) in the presence of NO2⁻ at environmentally relevant concentrations (0.1–5.0 mg L⁻¹). Six selected CECs with different structure...
Article
Metal sulfide precipitation by sulfate-reducing bacteria (SRB) is considered to be a promising method for antimony (Sb) removal from wastewater. Moreover, the addition of ferrous ions (Fe(II)) to the SRB system is expected to increase the metabolic activity of SRB. In this study, batch microcosms of SRB, with 0–600 mg/L Fe(II), are used to assess t...
Article
In this study, the potential formation of trichloronitromethane (TCNM) from model organic compounds in ammonia-containing water treated by UV/chlorine process was evaluated. Monochloramine generated from the reaction of chlorine and ammonia can be photolyzed to produce NO2- and reactive nitrogen species (RNS), which play important roles in the form...
Article
Microcystin-LR (MC-LR) is the most widely distributed and harmful variant toxins released by cyanobacteria, which poses potential threaten to people and aquatic animals when entering natural water. In our research, solar/chlorine process was comprehensively investigated to degrade and detoxify MC-LR. Under the chlorine concentration of 1.0 mg L-1,...
Article
The UV/persulfate (PS) process is a promising water treatment technology, and it can not only effectively degrade contaminants of emerging concern, but also control formation of disinfection byproducts (DBPs). In this study, we investigated the potential and mechanisms of chloropicrin (i.e. trichloronitromethane, TCNM) formation during chlorination...
Article
This study compared the degradation efficiency of diatrizoate (DTA) by UV/chlorine and UV/chloramine processes. DTA could be effectively degraded by the UV/chlorine and UV/chloramine processes compared with chlorination and chloramination solely. Although the UV/chlorine process was more sensitive to the variations of oxidant dosages, solution pH,...
Article
Vaccum-ultraviolet (VUV) is effective for elimination of organic contaminants in aqueous environment and degradation of carbamazepine (CBZ) by VUV irradiation was systematically investigated in this study. A dynamic kinetic model was developed to simulate the destruction of CBZ that is mainly initiated by hydroxyl radicals (HO[rad]). The second-ord...
Article
The electro-activation of persulfate (PS)by graphite felt (GF)electrode is a novel advanced oxidation process applied for the degradation of contaminants of emerging concern (CECs). Both GF anode and cathode can electro-activate PS to degrade CECs, including atrazine (ATZ), bisphenol S, ethinylestradiol, and ibuprofen. The study examines the remova...
Article
Full-text available
The vacuum ultraviolet (VUV) process, which can directly produce hydroxyl radical from water, is considered to be a promising oxidation process in degrading contaminants of emerging concern, because of no need for extra reagents. In this study, the influencing factors and mechanism for degradation of diethyl phthalate (DEP) by the VUV process were...
Article
UV/monochloramine (NH2Cl) process has attracted some attention for the elimination of contaminants of emerging concern as a novel advanced oxidation process. However, there is still much uncertainty on the performance and mechanisms of UV/NH2Cl process because of its complexity and generation of various species of radicals, including NH2•, HO•, Cl•...