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hexavalent chromium 2

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Leersia hexandra Swartz 1

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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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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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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: pre-reduction with ferric sulfate (FeSO4), sodium sulfide (Na2S), or citric acid (C6H8O7) in stabilizing hexavalentchromium (Cr(VI)) in highly contaminated soil.This 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 mineralsHowever, 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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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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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: The 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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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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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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Effects of phosphorus concentration on Cr(VI) sorption onto phosphorus-rich sludge biochar

DING Wenchuan,PENG Wenlong,ZENG Xiaolan,TIAN Xiumei

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 3,   Pages 379-385 doi: 10.1007/s11783-013-0606-0

Abstract: Biochar produced from sludge with phosphorus concentration of 20 mg·g gave the largest chromium sorptionThe chromium loaded biochar was analyzed using Fourier Transform Infrared Spectroscopy and X-ray Diffraction

Keywords： phosphorus     biochar     sewage sludge     hexavalent chromium     adsorption    

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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: Abstract • FeS/carbon fibers were in situ synthesized with Fe-carrageenan hydrogel fiber. • The double helix structure of carrageenan is used to load and disperse Fe. • Pyrolyzing sulfate groups enriched carrageenan-Fe could easily generate FeS. • The adsorption mechanisms include reduction and complexation reaction. Iron sulfide (FeS) nanoparticles (termed FSNs) have attracted much attention for the removal of pollutants due to their high efficiency and low cost, and because they are environmentally friendly. However, issues of agglomeration, transformation, and the loss of active components limit their application. Therefore, this study investigates in situ synthesized FeS/carbon fibers with an Fe-carrageenan biomass as a precursor and nontoxic sulfur source to ascertain the removal efficiency of the fibers. The enrichment of sulfate groups as well as the double-helix structure in ι-carrageenan-Fe could effectively avoid the aggregation and loss of FSNs in practical applications. The obtained FeS/carbon fibers were used to control a Cr(VI) polluted solution, and exhibited a relatively high removal capacity (81.62 mg/g). The main mechanisms included the reduction of FeS, electrostatic adsorption of carbon fibers, and Cr(III)-Fe(III) complexation reaction. The pseudo-second-order kinetic model and Langmuir adsorption model both provided a good fit of the reaction process; hence, the removal process was mainly controlled by chemical adsorption, specifically monolayer adsorption on a uniform surface. Furthermore, co-existing anions, column, and regeneration experiments indicated that the FeS/carbon fibers are a promising remediation material for practical application.

Keywords： Carrageenan     FeS     Double-helix structure     Hexavalent chromium    

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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: As a new technology used for the cleaning of chromium-contaminated soil, worldwide interest in eletrokineticHowever, owing to the fact that chromium exists as both cationic and anionic species in the soil, itTwo bench-scale experiments to remove chromium from contaminated soil were performed, one using a fixedAfter 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,

Keywords： approaching anodes     chromium-contaminated soil     electrokinetics     chromium fractionation    

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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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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: A soil remediation method combining in situ reduction of Cr(VI) with approaching anodes electrokinetic (AAs-EK) remediation is proposed. EK experiments were conducted to compare the effect of approaching anodes (AAs) and fixed electrodes (FEs) with and without sodium bisulfite (NaHSO ) as a reducing agent. When NaHSO was added to the soil before EK treatment, 90.3% of the Cr(VI) was reduced to Cr(III). EK experiments showed that the adverse effect of contrasting migration of Cr(III) and Cr(VI) species, which limits the practical application of this technique, was eliminated in the presence of the reducing agent. Furthermore, Tessier fractionation analysis indicated that the reducing agent changed the distribution of the chemical forms of Cr. The AAs-EK method was shown to acidize the soil as the anode moved toward the cathode and this acid front pushed the “focusing” region toward the cathode. After remediation, the pH of the soil was between 1.8 and 5.0 in AAs-EK experiments. The total Cr removal efficiency was 64.4% (except in the “focusing” region) when the reduction reaction was combined with AAs-EK method. We conclude that AAs-EK remediation in the presence of NaHSO is an appropriate method for Cr-contaminated soil.

Keywords： chromium     reduction reaction     contrasting migration     approaching anode     electrokinetic    

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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: The objectives of this study were to investigate the influence of chromium nanoparticles (Cr NPs) on

Keywords： Chromium nanoparticles (Cr NPs)     Metagenomic analysis     Metatranscriptomic analysis     Molecular ecological    

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Chromium steel from chromite ore processing residue----A valuable construction material from a waste

Jay N. MEEGODA, Wiwat KAMOLPORNWIJIT

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2,   Pages 159-166 doi: 10.1007/s11783-011-0325-3

Abstract: The primary objective of this study is to demonstrate an efficient and optimum way to recover chromiumIn this research, COPR was thermally treated to recover iron with chromium by applying techniques usedperformed using a Thermo-Gravimetric Analyzer (TGA) and bench scale tests to thermally treat the processed chromiumthermodynamic properties of the mixture to ensure good phase separation, least amounts of iron and chromiumoxides in the slag and minimum variability of final product (steel or iron with chromium).

Keywords： chromite ore processing residue     chromium steel     reduction     thermal treatment     beneficial use    

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Title Author Date Type Operation

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

Luman Zhou, Chengyang Wu, Yuwei Xie, Siqing Xia

Journal Article

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

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

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

Kinetics of hexavalent chromium reduction by iron metal

QIAN Huijing, WU Yanjun, LIU Yong, XU Xinhua

Journal Article

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

Journal Article

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

Haizhou Liu, Xuejun Yu

Journal Article

Effects of phosphorus concentration on Cr(VI) sorption onto phosphorus-rich sludge biochar

DING Wenchuan,PENG Wenlong,ZENG Xiaolan,TIAN Xiumei

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

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

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

Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN

Journal Article

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

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

Chromium steel from chromite ore processing residue----A valuable construction material from a waste

Jay N. MEEGODA, Wiwat KAMOLPORNWIJIT

Journal Article