Kitae Baek

Kitae Baek
Jeonbuk National University (former )Chonbuk National University

Ph.D.

About

241
Publications
43,440
Reads
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6,914
Citations
Introduction
* Associate Editor, Environmental Geochemistry & Health (SCIE) * Subject Editor, Journal of Soils and Sediments (SCIE) * Associate Editor, Korean Journal of Chemical Engineers (Environmental Engineering) (SCIE) * Topical Editor, Environmental Engineering Research (SCIE) * Associate Editor, Energy & Environment (SSCI) * Editor, Environmental Science and Pollution Research (SCIE) * Editorial Board Member, Journal of Hazardous Materials
Additional affiliations
April 2016 - present
Chonbuk National University
Position
  • Professor (Full)
November 2015 - present
Soil Environment Research Center
Position
  • Managing Director
March 2012 - March 2016
Chonbuk National University
Position
  • Professor (Associate)

Publications

Publications (241)
Article
It has been well recognized that the Fenton reaction requires a rigorous pH control and suffers from the fast self-degradation of H2O2. In an effort to resolve the technical demerits of the conventional Fenton reaction, particular concern on the use of CaO2-based Fenton reaction was paid in this study. To realize the practical use of CaO2 in the Fe...
Article
Polycyclic aromatic hydrocarbons (PAHs) are known as a hazardous group of pollutants in the soil which causes many challenges to the environment. In this study, the potential of biochar (BC), as a carbonaceous material, is evaluated for the immobilization of PAHs in soils. For this purpose, various bonding mechanisms of BC and PAHs, and the strengt...
Article
Seeking a technically reliable disposal platform for milk sludge has drawn particular concern considering its hazardous potential to our environment. Milk sludge from the dissolved air flotation process has abundant calcium because of the naturally available calcium in milk and lime addition as a coagulant. No previous study on its ability to remov...
Article
The mobilization of As in paddy soils is affected by iron redox cycles. In this regard, calcium peroxide (CaO2) can be used as an alternative to maintaining oxidizing conditions by liberating oxygen under flooding environments. Nevertheless, the problem of increase in pH by CaO2 dissolution remains unresolved. In this study, the encapsulation of Ca...
Article
Full-text available
Nanomaterials are threatening the environment and human health, but there has been little discussion about the stability and mobility of nanoparticles (NPs) in saturated porous media at environmentally relevant concentrations of surfactants, which is a knowledge gap in exploring the fate of engineered NPs in groundwater. Therefore, the influences o...
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Among the chlorinated aliphatic hydrocarbons, 1,2-dichloroethane (1,2-DCA) is widely used for the synthesis of vinyl chloride monomers. Despite the high demand for 1,2-DCA, it poses a risk to the environment because it is persistent and carcinogenic. Therefore, in this study, several reagents (dithionite, hydrosulfide, sulfite, persulfate, sulfate...
Article
Total organic carbon (TOC), total nitrogen (TN), and total phosphorous (TP) are the most common indicators of water quality. The analytical processes of the indicators require oxidation of any type of C, N, and P to carbon dioxide, nitrate, and phosphate as final products. Persulfate is the recommended oxidant for these transformations. In this stu...
Article
The Antarctic krill, referring to Euphausia superba, feeds phytoplankton, grown up with photosynthesis for CO2 fixation. Therefore, the use of krill as a raw feedstock for energy production is a highly carbon negative approach, not disturbing the food supply chain of human. Although the krill has high lipid content (up to 40 wt.%, dry basis), its u...
Article
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This review summarizes the mechanisms for desorbing and extracting cesium (Cs+) from clay minerals and soil. Most techniques use ion exchange with acids, cations, polymers, and surfactants. Some improve desorption of Cs+ from clay minerals, while surfactants and polymers expand the interlayer. Mixtures of acids/polymers, acids/surfactants, cations/...
Article
Nitrate is the most common contaminant in groundwater in Korea, as well as across the world. Reduction of nitrate to ammonia is one of the options available to remediate groundwater. In this study, nitrate in groundwater was removed using a zero-valent iron (ZVI) containing biochar synthesized by co-pyrolyzing iron oxide and sawdust biomass. Among...
Article
The growing consumption of plastic materials has increased hazardous threats to all environmental media, since current plastic waste management methods release microplastics and toxic chemicals. As such, massive generation of plastic derived pollutants leads to significant public health and environmental problems. In this work, an environmentally s...
Article
Polychlorinated biphenyls (PCBs) are hazardous organic contaminants threatening human health and environmental safety due to their toxicity and carcinogenicity. Biochar (BC) is an eco-friendly carbonaceous material that can extensively be utilized for the remediation of PCBs-contaminated soils. In the last decade, many studies reported that BC is b...
Article
Fenton reaction using hydrogen peroxide (H2O2) has been widely applied to achieve the in-situ chemical oxidation of contaminated soil and groundwater. However, injecting and transporting H2O2 to a contaminated zone consumes the chemical through reactions with other substances and self-decomposition. Additionally, Fe(II), an activator for the Fenton...
Article
The decommissioning of old nuclear power plants is a worldwide issue and the removal of radioactive materials from soil is challenging. In this study, we proposed a hybrid process that combines soil washing for extraction and selective adsorption for Cs-containing washing wastewater to treat cesium (Cs⁺)-contaminated soil. To extract Cs⁺ from the s...
Article
In-situ chemical oxidation (ISCO) is commonly practiced to degrade organic pollutants in various fields. However, ISCO is deteriorated the oxidation efficiency due to the non-selective and self-decomposition of reagents. Therefore, in-situ generation of oxidants is being proposed to compensate for the demerits of conventional ISCO. In this study, t...
Article
Powder adsorbents perform well due to their large surface area but are difficult to use because of aggregation and channeling. In this study, pelletization of adsorbents was proposed as a solution to these operating problems. A three-component mixture was extruded into pellets and calcined under air or nitrogen conditions The pellet adsorbent remov...
Article
Powder adsorbents show an excellent adsorption capacity for arsenic(As) due to the large specific surface area. However, the performance of powder adsorbents decreases significantly by channeling in the adsorption bed, and the powder is released from the bed. Pelletization of power adsorbent can solve the problems, and bentonite was proposed as a b...
Article
To improve soil quality, contaminated-soil can be amended with biochar, but the stability of biochar due to the exposure to the environment is not well elucidated. Furthermore, with the emerging introduction of CO2 as a reaction medium to increase the stability of biochar, a strategic study of reactive media for pyrolysis on biochar stability is re...
Article
Wastewater treatment plants (WWTPs) are important sources of microplastics (MPs), having a high daily discharge of MPs despite a relatively high removal efficiency of MPs. Recently, MPs have been detected in drinking water purification facilities (DWPFs), indicating a direct threat to humans. In this review, we summarize published papers on the occ...
Article
Objective:This study proposed the simultaneous multi-oxidation of total organic carbon, total nitrogen, and total phosphorous using modified wet chemical oxidation method. Methods:The multi oxidation process was based on the dual radical system with sulfate and hydroxyl radicals. The sodium persulfate (Na2S2O8) and sodium hydroxide (NaOH) were act...
Article
Arsenic (As) is uptaken more readily by rice over wheat and barley. The exposure of As to humans being in the rice-consuming regions is a serious issue. Thus, an effective practice to reduce the translocation of As from soil to rice grain should be implemented. During a flooding period, the water layer greatly limits the transport of oxygen from at...
Article
Total organic carbon (TOC) has been suggested and utilized as an index of organic matter in aqueous phases. The overall performance of TOC is highly dependent on the method of oxidation of organic matter to carbon dioxide, such as high-temperature combustion (HTC) and wet chemical oxidation (WCO). HTC requires more energy and maintenance cost, it i...
Article
The concrete building and paved roads in the urban areas can be exposed to cesium (Cs⁺) in case of the accidental release to environment. The adsorption kinetics of Cs⁺ onto concrete powder was well-represented by the pseudo-second-order kinetic model and intra-particle diffusion model. Both Langmuir and Freundlich isotherm models adequately descri...
Article
In-situ chemical oxidation (ISCO) requires an injection of oxidants into a contaminated site. However, the oxidants decompose and react with contaminants during transport to the contaminated region, which causes oxidant over-consumption. In-situ oxidant generation can solve this problem, and electrochemical methods can be applied to achieve this. E...
Article
Iron-modified graphitic carbon nitride (FG materials) was prepared through a simple and cost-effective method using iron oxide and melamine to achieve simultaneous oxidation and adsorption of arsenic. We hypothesized that graphitic carbon nitride oxidizes As(III) to As(V) under light irradiation, and the converted As(V) is adsorbed by the amorphous...
Article
Biochar is widely used material whose physical and chemical characteristics been widely investigated. Nevertheless, dissolved organic matter (DOM) released from biochar has received relatively little attention. In particular, little research has been conducted to understand the effects of feedstock biomass components on biochar DOM release. To cont...
Article
Korea Ministry of Environment regulates the soil quality based on the pseudo-total content of metals extracted by aqua-regia, and the concentration of metals has been used in the risk assessment of the contaminated site. The pseudo-total content of metals can be accepted conservatively as a potentially risky concentration of metals in the soil. How...
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Full-text available
Elevated level of arsenic (As) in marine sediment via deposition and accumulation presents long-term ecological risks. This study proposed a sustainable stabilization/solidification (S/S) of As-contaminated sediment via novel valorization of red mud waste, blast furnace slag and calcined clay mineral, which were selected to mitigate the increased l...
Article
Powder type of adsorbent has a huge surface area, but the powders are aggregated, which lowers the adsorption of arsenic(As) dramatically due to preferential flow in the adsorption bed. Pellet adsorbent to remove As was prepared to solve the problems of powder type adsorbent using dewatered alum sludge and molasses as a binder. The pellet was treat...
Article
The oxidation of trivalent arsenic (As(III)) to pentavalent arsenic (As(V)) is a common pretreatment to remove As(III) from the aqueous phase. The graphitic carbon nitride as a photocatalyst can transform As(III) to As(V), but the photocatalyst does not adsorb any species of arsenic. In this study, a new composite material to achieve the simultaneo...
Article
Employing biochar for environmental remediation has been widely practiced. Nonetheless, the reduction mechanisms of hexavalent chromium (Cr(VI)) in the presence of biochar have not been fully elucidated (i.e., direct or indirect reduction of Cr(VI) by biochar). In particular, the effect of light on Cr(VI) reduction by biochar was rarely reported. T...
Article
Dissolved organic matter (DOM) elucidated from biochars enhances the dissolution of iron oxides and reduction of iron. However, given that reduction mechanism of iron (Fe(III)) in the practical biochar applications for soil amendment and environmental remediation have not been fully elucidated, this study laid great emphasis on the photo-induced Fe...
Article
Up to date, despite the massive generation of crude oil sludge (COS), the technical completeness for disposing COS has not been fully achieved. Considering its harmfulness and the high content of hydrocarbon species, establishing an environmentally benign platform for the simultaneous waste disposal and energy recovery will be greatly important. To...
Article
The fate and transport of cesium (Cs⁺) is strongly related to the presence of clay minerals in soils, and their weathering due to natural cycles of wetting and drying. In this study, the adsorption characteristics of Cs⁺ under repeated wetting and drying conditions were investigated using the 1:1 lattice clay mineral, kaolinite, the non-expanding 2...
Article
An adsorbent of bead type to remove arsenic (As) was developed by calcination of sodium alginate and polyvinyl alcohol containing a powder form of alum sludge. The adsorbent was evaluated in terms of adsorption kinetics, capacities in batch tests and by a column study. The calcination process created rough surface and increased the surface area of...
Article
Oxalic acid can effectively extract arsenic bound to amorphous iron oxides via dissolution of iron oxides containing arsenic. Therefore, soil washing with oxalic acid is a promising method to remediate arsenic-contaminated soil, since arsenic is often associated with amorphous iron oxides in soil. However, high cost of oxalic acid compared to the o...
Article
Full-text available
The retention of radioactive cesium (Cs) in soil is significantly related to the types of clay minerals, while the weathering process affects the irreversible adsorption sites in clay minerals. In this study, the effect of weathering (exposure duration of Cs and repeated wetting and drying cycles) on fractionation of Cs in soils was investigated us...
Article
In this study, we reviewed the selective adsorption and irreversible fixation of cesium (Cs ⁺ ) on clay minerals. The selective adsorption of Cs ⁺ results from reactions with frayed edge sites (FES) of clay minerals. The content of FES is about 0.1–2.0% of the total cation exchange capacity (CEC). The fractionation of Cs ⁺ in actual accident sites...
Article
Recycling waste materials as adsorbents for stabilising contaminated marine sediment is a low-cost and sustainable remediation method. The objective of this research was to evaluate the efficacy of organic (lignite and green waste compost) and inorganic wastes (acid mine drainage sludge (AMDS) and coal fly ash (CFA)) on metal stabilisation and asse...
Article
The enhanced thermolysis of heavy oil contaminated soil using CO2 as reaction medium for the simultaneous soil remediation and energy recovery was investigated. To avoid any complexities arising from the heterogeneous matrix of soil, heavy oil contaminated soil was artificially mimicked by means of homogenizing sand and bunker C (the mass ratio of...
Article
In order to reduce landfill disposal of waterworks sludge (alum sludge) and incinerated sewage sludge ash (ISSA), this study proposed an innovative approach for upcycling them into value-added controlled low-strength materials (CLSM). Waterworks sludge interfered with cement hydration reaction and delayed the stiffening time of CLSM (> 10 h) due to...
Article
This study highlights a novel method for the production of bioalcohols, like 1-butanol, from organic waste-derived volatile fatty acids (VFAs) via non-biological pathways. A strategic two-step process was conducted to afford the bioalcohols. The process consists of esterification of VFAs to form VFA methyl esters (VFAMEs) followed by hydrogenation...
Article
Disposal of significant amounts of dredged contaminated sediment poses an economic and environmental problem worldwide. Transforming contaminated sediment into value-added construction materials using low-carbon MgO cement is a sustainable option; however, the weak mechanical strength and unreliable water-solubility of MgO cement restrict its pract...
Article
Sediments nearby harbors are dredged regularly, and the sediments require the stringent treatment to meet the regulations on reuse and mitigate the environmental burdens from toxic pollutants. In this study, FeCl3 was chosen as an extraction agent to treat marine sediment co-contaminated with Cu, Zn, and total petroleum hydrocarbons (TPH). In chemi...
Article
Management of dredged sediment has been a worldwide challenge. Conventional off-site marine disposal of contaminated sediment incurs substantial cost implications and secondary pollution risks. This study developed value-added and time-effective approaches that transform contaminated sediment into construction materials to be used as fill materials...
Article
Co-pyrolysis of chicken manure and biomass was investigated in this study. The pyrolysis of individual samples was characterized by thermogravimetric analysis (TGA) under N2 and CO2 atmospheres. This demonstrated that the impact of CO2 content on the physical aspects of pyrolysis such as onset and end temperatures, and residual mass was negligible....
Article
In this study, we introduce a low-cost, efficient, porous catalytic material produced from chicken manure by pyrolysis (i.e., chicken manure biochar) for converting waste cooking oil into fatty acid methyl esters (FAME, i.e., biodiesel) via transesterification. Chicken manure can be pyrolysed at different temperatures (350, 450, 550, and 660 °C), a...
Article
To date, studies on the mobility of arsenic (As) in soil amended with biochar have primarily relied on broad empirical observations, resulting in a gap between the behavior of As in amended soil and the chemical mechanisms controlling that behavior. This study focuses on the influence of abiotic factors in As mobility in As-contaminated soils amend...
Article
Stabilization/solidification (S/S) is a low-cost and time-efficient method for soil remediation, however, delayed hydration reactions and high carbon footprint are major limitations for the treatment of high-Pb contaminated soil. This study develops a novel and low-carbon approach that combines ground granulated blast furnace slag (GGBS) and ordina...
Article
Biological wastewater treatment produces biowaste (sludge), which contains a high portion of organic matter. The organic matter comes from microorganisms, and the biowaste can be converted into biochar, a carbon-rich, fine-grained, and porous substance. Granular sludge from upflow anaerobic sludge blanket contains more organic matter (80 wt% of dry...
Article
To extract As bound to amorphous and crystalline iron oxides, this study proposed simultaneous application of oxalic acid and dithionite, which was observed to induce synergistic effect and accomplish effective extraction of As bound to both iron oxides. However, the formation of arsenic sulfide decreased overall removal of As because the insoluble...
Article
Chelant-enhanced soil washing, such as EDTA (ethylenediaminetetraacetic acid) and biodegradable EDDS ([S,S]-ethylene-diamine-disuccinic acid), has been widely studied, however, EDTA is persistent under natural conditions while EDDS has a low efficiency for Pb extraction. Therefore, we investigated the efficacy of mixed chelants (EDDS and EDTA mixtu...
Article
For removing potentially toxic elements (PTEs) from field-contaminated soils, cost-effective soil remediation has been a worldwide concern. As one of the widely employed techniques, chelant-enhanced phytoremediation can remove PTEs with marginal impact on the soil properties, yet the newly formed metal-chelant complexes cannot be completely capture...
Article
This study explored the mechanistic features of CO2 in the thermolysis of PVC to modify the pyrogenic products. The mechanistic role of CO2 in the thermolysis of PVC was varied on the pyrolytic temperature. For example, CO participated the unknown reactions to form CO at temperature higher than 600 ˚C, where CO2 played a role for an oxygen donor (n...
Article
Clay minerals could reduce Cr(VI) to Cr(III) in the soil, but the mechanisms and influential factors for the reduction reaction have not been clearly reported. In this study, it was hypothesized that the Fe(II) released from the clay minerals or adsorbed on the clay surface plays a crucial role in the reduction of Cr(VI). The Fe(II) released from c...
Article
The management and disposal of alum sludge generated from water treatment works is a worldwide issue. This study proposed an innovative method to utilize alum sludge as a partial replacement of recycled fine aggregate for producing controlled low strength material (CLSM). Various supplementary cementitious materials (SCMs) and accelerators were inc...
Article
Full-text available
Purpose Cr(VI) could be reduced in nature by citric acid, Mn(II), and montmorillonite. However, the co-presence of each material could enhance or inhibit Cr(VI) reduction. In this study, the synergistic interaction of citric acid, Mn(II), and montmorillonite on reduction of Cr(VI) was evaluated by experimental design. Materials and methods The int...
Article
Alum sludge from water treatment facilities is composed mainly of aluminum hydroxide or aluminum oxide, which can adsorb As(V). However, microorganisms and organic/inorganic matter agglomerated together with raw alum sludge inhibit the adsorption of As(V) onto the material. Calcination was used to remove organic matter and activate the material, an...
Article
In this study, soil washing and stabilization as a two-step soil remediation strategy was performed to remediate Pb- and Cu-contaminated soils from shooting range and railway sites. Ferric nitrate (Fe(NO3)3) and [S,S]-ethylenediamine disuccinate (EDDS) were used as washing agents, whereas three types of sludge-derived biochars and phosphogypsum wer...
Article
Remediation of CCA-contaminated soil (Cr, Cu, and As) by biodegradable chelant-enhanced washing (EDDS, S,S-ethylene-diamine-disuccinic-acid) needs further enhancement. This study investigated the effectiveness of coupling with pre-treatment by selective dissolution and post-treatment by soil amendments, respectively. Three groups of reagents (reduc...
Article
In this study, we evaluated the feasibility of using ferric salts including FeCl3 and Fe(NO3)3 as extracting and oxidizing agents for a soil washing process to remediate Pb-contaminated soils. We treated various Pb minerals including PbO, PbCO3, Pb3(CO3)2(OH)2, PbSO4, PbS, and Pb5(PO4)3(OH) using ferric salts, and compared our results with those ob...
Article
Most of radioactive nuclides emitted into the air eventually fall to the ground, after then 80% of cesium fallout is fixed in soil and the other 20% is mobile as exchangeable fraction. It is most difficult to remove cesium from the soil after contamination because of the strong adsorption onto clay mineral especially illite, compared to other radio...
Article
Full-text available
Biochar has attracted significant attention for its potential as a carbon-neutral biowaste treatment and adsorbent. However, the adsorbed contaminants should be treated further. This study is intended to degrade or mineralize adsorbed contaminants using biochar. Among biowaste, nitrogen rich materials can produce graphitic carbon nitride (g-C3N4) w...
Article
Full-text available
Electrokinetic remediation (EKR) is the most efficient technique for remediation of fine-grained soil. The primary removal mechanisms of heavy metal in EKR are the electromigration and electroosmosis flow under appropriate electric gradients. Most EKR studies have researched the variation according to the electrolyte and electric voltage. Also, EKR...
Article
Full-text available
Persulfate (PS) can be activated by transition metal to generate a sulfate radical and oxidize persistent organic pollutants. However, activation with excessive Fe(II) causes unnecessary self-degradation of PS. In this study, Fe(II) was slowly and continuously injected electrochemically using an iron anode to minimize the self-degradation of PS. Ad...
Article
Full-text available
Cesium (Cs) generated by nuclear accidents is one of the most hazardous radionuclides because of its gamma radiation and long half-life. Especially, when Cs is exposed on the soil environments, Cs is mainly adsorbed on the topsoil and is strongly combined with tiny soil particle including clay minerals. The adsorption of Cs onto soil can vary depen...