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Effects of reducing agent and approaching anodes on chromium removal in electrokinetic soil remediation

Xiaona WEI,Shuhai GUO,Bo WU,Fengmei LI,Gang LI

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 2,   Pages 253-261 doi: 10.1007/s11783-015-0791-0

Abstract: The total Cr removal efficiency was 64.4% (except in the “focusing” region) when the reduction reaction

Keywords： chromium     reduction reaction     contrasting migration     approaching anode     electrokinetic    

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Hyperbranched magnetic polymer: highly efficient removal of Cr(VI) and application in electroplating

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1568-1580 doi: 10.1007/s11705-023-2303-2

Abstract: magnetic adsorbent polymer (TTCA/THT@Fe3O4) was synthesized to achieve the efficient removalNotably, the removal efficiency can approach 98.9%, even at the lower concentration of 20 mg∙L‒1reduction enhances the adsorption performance of TTCA/THT@Fe3O4 for Cr(VI) and total chromium

Keywords： magnetic polymer     chromium removal     hydrogen bonding     recyclability     actual wastewater    

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from metagenomic, metatranscriptomic, and molecular ecological network analyses into the effects of chromium

Quan Zheng, Minglu Zhang, Tingting Zhang, Xinhui Li, Minghan Zhu, Xiaohui Wang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 4, doi: 10.1007/s11783-020-1239-8

Abstract: Abstract • Cr NPs significantly promoted the denitrifying process and phosphorus removal. • The quantitiesThe objectives of this study were to investigate the influence of chromium nanoparticles (Cr NPs) onthe nitrogen and phosphorus removal performance and the bacterial structures of an activated sludge (the change of the functional genes and their expression patterns related to nitrogen and phosphorus removalThe relative abundance of denitrifying and phosphorus removal microorganisms, such as Denitratisoma,

Keywords： Chromium nanoparticles (Cr NPs)     Metagenomic analysis     Metatranscriptomic analysis     Molecular ecologicalnetworks (MENs)     Nitrogen and phosphorus removal    

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In situ synthesis of FeS/Carbon fibers for the effective removal of Cr(VI) in aqueous solution

Rongrong Zhang, Daohao Li, Jin Sun, Yuqian Cui, Yuanyuan Sun

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 4, doi: 10.1007/s11783-020-1247-8

Abstract: Iron sulfide (FeS) nanoparticles (termed FSNs) have attracted much attention for the removal of pollutantscarbon fibers with an Fe-carrageenan biomass as a precursor and nontoxic sulfur source to ascertain the removalFeS/carbon fibers were used to control a Cr(VI) polluted solution, and exhibited a relatively high removalkinetic model and Langmuir adsorption model both provided a good fit of the reaction process; hence, the removal

Keywords： Carrageenan     FeS     Double-helix structure     Hexavalent chromium    

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Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction

Luman Zhou, Chengyang Wu, Yuwei Xie, Siqing Xia

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 2, doi: 10.1007/s11783-019-1206-4

Abstract: • Pd nanoparticles could be reduced and supported by activated sludge microbes. • The effect of biomass on Pd adsorption by microbes is greater than Pd reduction. • More biomass reduces Pd particle size, which is more dispersed on the cell surface. • When the biomass/Pd add to 6, the catalytic reduction rate of Cr(VI) reaches stable. Palladium, a kind of platinum group metal, owns catalytic capacity for a variety of hydrogenations. In this study, Pd nanoparticles (PdNPs) were generated through enzymatic recovery by microbes of activated sludge at various biomass/Pd, and further used for the Cr(VI) reduction. The results show that biomass had a strong adsorption capacity for Pd(II), which was 17.25 mg Pd/g sludge. The XRD and TEM-EDX results confirmed the existence of PdNPs associated with microbes (bio-Pd). The increase of biomass had little effect on the reduction rate of Pd(II), but it could cause decreasing particle size and shifting location of Pd(0) with the better dispersion degree on the cell surface. In the Cr(VI) reduction experiments, Cr(VI) was first adsorbed on bio-Pd with hydrogen and then reduced using active hydrogen as electron donor. Biomass improved the catalytic activity of PdNPs. When the biomass/Pd (w/w) ratio increased to six or higher, Cr(VI) reduction achieved maximum rate that 50 mg/L of Cr(VI) could be rapidly reduced in one minute.

Keywords： Palladium nanoparticles     Activated sludge     Hexavalent chromium    

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Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated

Haiyan Mou, Wenchao Liu, Lili Zhao, Wenqing Chen, Tianqi Ao

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1353-7

Abstract: with ferric sulfate (FeSO4), sodium sulfide (Na2S), or citric acid (C6H8O7) in stabilizing hexavalent chromiumThis combined treatment greatly improved the stabilization efficiency of chromium because the reductionof Cr(VI) into Cr(III) decreased the mobility of chromium and made it more easily encapsulated in mineralsthe formation of new Cr-containing compounds, which significantly decreased subsequent leaching of chromiumHowever, without reduction treatment, chromium continued to leach from the soil even after being sintered

Keywords： Chromium     Heavy contaminated soil     Reduction     Sintering     Stabilization     Speciation    

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Concurrent adsorption and reduction of chromium(VI) to chromium(III) using nitrogen-doped porous carbon

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 5, doi: 10.1007/s11783-021-1491-6

Abstract:

• A high-efficiency N-doped porous carbon adsorbent for Cr(VI) was synthesized.

Keywords： Chromium(VI)     Nitrogen-doped porous carbon     Adsorption     Reduction     Loofah sponge    

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Enhanced electrokinetic remediation of chromium-contaminated soil using approaching anodes

Shucai LI, Tingting LI, Gang LI, Fengmei LI, Shuhai GUO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 869-874 doi: 10.1007/s11783-012-0437-4

Abstract: paper reports upon a study in which a process using approaching anodes (AAs) was used to enhance the removalefficiency of chromium by eletrokinetics.After remediation, soil pH, total chromium, and fractionation of chromium in the soil were determinedThe average removal efficiency of total chromium was 11.32% and 18.96% in the FA and AAs experiments,removal from soil.

Keywords： approaching anodes     chromium-contaminated soil     electrokinetics     chromium fractionation    

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Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal

Yixin Zhang, Lu Zhou, Liqing Chen, Yang Guo, Fanhui Guo, Jianjun Wu, Baiqian Dai

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 3,   Pages 518-527 doi: 10.1007/s11705-020-1926-9

Abstract: The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by 2021. It has mainly been disposed as solid waste by landfill. There is lack of study focused on its utilization. In this paper, the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an adsorbent. The effects of synthesis conditions on the cation exchange capacity (CEC) of zeolite were investigated. The results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the CEC. When the synthesized zeolite with the highest CEC (275.5 meq/100 g) was used for the adsorption of Cr(VI) from aqueous solution, the maximum adsorption capacity for Cr(VI) was found to be 17.924 mg/g. The effects of pH, contact time and initial concentration on the adsorption of Cr(VI) were also investigated. The adsorption kinetics and isotherms can be well described by the pseudo-second-order model and Langmuir isotherm model, respectively.

Keywords： coal fly ash     gasification     zeolite     Na-P1     chromium(VI)    

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Effects of irradiation on chromium’s behavior in ferritic/martensitic FeCr alloy

Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 181-183 doi: 10.1007/s11708-009-0025-x

Abstract: The effects of irradiation on chromium performance under different temperatures in Fe-20at%Cr were modeledChromium precipitation was observed in FeCr alloy after irradiation; interstitial Chromium atoms arethe preferred formation of mixed Fe-Cr dumbbells in the direction of<110>and<111>; interstitial chromium

Keywords： irradiation     Fe-20at%Cr alloy     chromium segregation    

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Electroreduction of hexavalent chromium using a porous titanium flow-through electrode and intelligent

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 8, doi: 10.1007/s11783-023-1697-x

Abstract:

● Titanium-based flow-through electrode achieved high Cr(VI) reduction efficiency.

Keywords： Flow-through electrode     Hexavalent chromium     Heavy metals     Neural network     Artificial intelligence    

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Hexavalent chromium in drinking water: Chemistry, challenges and future outlook on Sn(II)- and photocatalyst-based

Haizhou Liu, Xuejun Yu

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 5, doi: 10.1007/s11783-020-1267-4

Abstract: Chromium (Cr) typically exists in either trivalent and hexavalent oxidation states in drinking water,drinking water, with a strong dependence on groundwater sources, mainly due to naturally weathering of chromium-containing

Keywords： Chromium     Chemistry     Treatment     Future outlook    

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Reduction of hexavalent chromium with scrap iron in a fixed bed reactor

Yin WANG, Xuejiang WANG, Xin WANG, Mian LIU, Siqing XIA, Daqiang YIN, Yalei ZHANG, Jianfu ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 761-769 doi: 10.1007/s11783-012-0413-z

Abstract: The reduction of hexavalent chromium by scrap iron was investigated in continuous long-term fixed bedIn addition to iron oxides and hydroxide species, iron-chromium complex was also observed on the reacted

Keywords： hexavalent chromium     scrap iron     reduction capacity     drinking water    

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Chromium phytoextraction and physiological responses of the hyperaccumulator Swartz to plant growth-promoting

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 1, doi: 10.1007/s11783-023-1609-0

Abstract:

● Improved Cr phytoextration efficiency was achieved by B. cereus inoculation.

Keywords： Hexavalent chromium     Hyperaccumulator     Rhizobacteria     Leersia hexandra Swartz     Bacillus cereus    

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Kinetics of hexavalent chromium reduction by iron metal

QIAN Huijing, WU Yanjun, LIU Yong, XU Xinhua

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 51-56 doi: 10.1007/s11783-008-0010-3

Abstract: Nearly 86.8% removal efficiency for Cr(VI) was achieved when Fe concentration was 6 g/L (using commercialThe reduction of hexavalent chromium took place on the surface of the iron particles following pseudo-first

Keywords： Different     process     surface     Electrochemical analysis     concentration    

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Title Author Date Type Operation

Effects of reducing agent and approaching anodes on chromium removal in electrokinetic soil remediation

Xiaona WEI,Shuhai GUO,Bo WU,Fengmei LI,Gang LI

Journal Article

Hyperbranched magnetic polymer: highly efficient removal of Cr(VI) and application in electroplating

Journal Article

from metagenomic, metatranscriptomic, and molecular ecological network analyses into the effects of chromium

Quan Zheng, Minglu Zhang, Tingting Zhang, Xinhui Li, Minghan Zhu, Xiaohui Wang

Journal Article

In situ synthesis of FeS/Carbon fibers for the effective removal of Cr(VI) in aqueous solution

Rongrong Zhang, Daohao Li, Jin Sun, Yuqian Cui, Yuanyuan Sun

Journal Article

Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction

Luman Zhou, Chengyang Wu, Yuwei Xie, Siqing Xia

Journal Article

Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated

Haiyan Mou, Wenchao Liu, Lili Zhao, Wenqing Chen, Tianqi Ao

Journal Article

Concurrent adsorption and reduction of chromium(VI) to chromium(III) using nitrogen-doped porous carbon

Journal Article

Enhanced electrokinetic remediation of chromium-contaminated soil using approaching anodes

Shucai LI, Tingting LI, Gang LI, Fengmei LI, Shuhai GUO

Journal Article

Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal

Yixin Zhang, Lu Zhou, Liqing Chen, Yang Guo, Fanhui Guo, Jianjun Wu, Baiqian Dai

Journal Article

Effects of irradiation on chromium’s behavior in ferritic/martensitic FeCr alloy

Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN

Journal Article

Electroreduction of hexavalent chromium using a porous titanium flow-through electrode and intelligent

Journal Article

Hexavalent chromium in drinking water: Chemistry, challenges and future outlook on Sn(II)- and photocatalyst-based

Haizhou Liu, Xuejun Yu

Journal Article

Reduction of hexavalent chromium with scrap iron in a fixed bed reactor

Yin WANG, Xuejiang WANG, Xin WANG, Mian LIU, Siqing XIA, Daqiang YIN, Yalei ZHANG, Jianfu ZHAO

Journal Article

Chromium phytoextraction and physiological responses of the hyperaccumulator Swartz to plant growth-promoting

Journal Article

Kinetics of hexavalent chromium reduction by iron metal

QIAN Huijing, WU Yanjun, LIU Yong, XU Xinhua

Journal Article