Reduction of toxic Cr(VI)-humic acid in an ionic liquid

Huang, Hsin-Liang; Huang, Hsin‐Hung; Wei, Yu Jhe

doi:10.1016/j.sab.2017.04.007

Cited by 18 publications

(2 citation statements)

References 35 publications

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“…Two of the most stable oxidation forms of Cr, trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)), are abundant in diverse environments [ 3 ]. Cr(VI) is more soluble, mutagenic, and toxic than Cr(III), which has aroused increasing public concern [ 4 , 5 ]. Biotransformation of Cr(VI) has thereby appeared and rapidly developed [ 6 , 7 , 8 ] as it is environment-friendly and cost-effective [ 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of TOC Concentration of Humic Substances as an Electron Shuttle on Redox Functional Groups Stimulating Microbial Cr(VI) Reduction

Zhang

Duan

Jiang

et al. 2022

IJERPH

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Humic substances as an electron shuttle play an essential role in the biogeochemistry processes. However, the influence of total organic carbon (TOC) concentrations of humic substances on microbial Cr(VI) reduction remains unclear. In this study, the rates and extents of Cr(VI) reduction by Shewanella oneidensis MR-1 in the presence of Leonardite humic acids (LHA) and Pahokee peat humic acids (PPHA) with different TOC concentrations were evaluated. We found that the enhanced reduction in Cr(VI) was associated with TOC concentrations of 2.5–50 mg C/L of HA samples. The result shows that HA as an electron shuttle impacted both rates and extents of microbial Cr (VI) reduction, which delivered differently in terms of low TOC concentration range of 2.5 to 15 mg C/L and high concentration range of 15–50 mg C/L. The rates of Cr(VI) reduction significantly enhanced in the low TOC concentration range of HA compared to a high concentration range. The highest acceleration rate of Cr(VI) reduction was achieved at 15 mg C/L of HA. The quinone-like fluorophore was responsible for the main redox-active functional groups of HA by the three-dimensional excitation-emission spectroscopy. The fluorescence intensity of quinone-like fluorophore of HA in the low TOC concentration range was positively correlated with its acceleration coefficient, corresponding to the highest microbial Cr(VI) reduction rate obtained in 15 mg C/L of HA. These findings highlighted the effect of the TOC concentration of HA on microbial Cr(VI) reduction processes. It emphasized that the low TOC concentration of HA contributed to the high rates of Cr(VI) reduction, which is critical for better understanding the fate of Cr(VI) and evaluating the effectiveness of Cr(VI) restoration strategies in the future.

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Section: Introductionmentioning

confidence: 99%

Effect of TOC Concentration of Humic Substances as an Electron Shuttle on Redox Functional Groups Stimulating Microbial Cr(VI) Reduction

Zhang

Duan

Jiang

et al. 2022

IJERPH

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“…At the same time, HA is a kind of environment-friendly substance with abundant source, low price, safety and non-toxicity [ 23 ]. HA is composed of aromatic rings, bridges (including alkylene, ether or ester linkages) and side chains (including alkyl, carboxyl and hydroxyl groups) [ 24 ], and it has high chemical reactivity in soil, such as ion exchange, complexation and oxidation-reduction, due to its various active groups and large specific surface area [ 25 ], thus it can be introduced into the SAPs to improve water absorbency and salt resistance of the polymer to enhance the water retention capacity and chemical properties of the soil, such as its ability to adsorb soluble salts in the soil, hinder harmful cations, reduce soil salt concentration and so on [ 26 ]. Furthermore, Shen et al [ 27 ] showed that bentonite was modified by introducing HA into the interlayer space of bentonite, which exhibited a much higher adsorption capacity to NH 4 + -N and NO 3 − -N in soil.…”

Section: Introductionmentioning

confidence: 99%

Water-Preserving and Salt-Resistant Slow-Release Fertilizers of Polyacrylic Acid-Potassium Humate Coated Ammonium Dihydrogen Phosphate

Yang

Cao

et al. 2021

Polymers

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Polyacrylic acid (PAA) has high water absorbency but poor salt resistance. Humic acid (HA) extracted from lignite was introduced into the cross-linked copolymer systems of AA to improve the water absorbency and salt-tolerance. A polyacrylic acid-potassium humate (PAA-KHA) coated ammonium dihydrogen phosphate (ADP) fertilizer with water-preserving, salt-resistant and slow-release properties was prepared. The main properties of HA extracted from lignite oxidized by H2O2 were studied. Furthermore, the synthesis process, water absorbency of PAA-KHA in deionized water and in NaCl solution, morphologies of PAA-KHA, and the slow-release performance of the fertilizer (ADP@PAA-KHA) were investigated. The results showed PAA-KHA had a layered interpenetrating network, which can provide sufficient storage space for water and nutrients. The salty water absorbency of PAA-KHA increased by about 3 times compared to PAA. Both the PO43− and NH4+ cumulative release of ADP@PAA-KHA with a coating rate of 10% in deionized water, were less than 20% within 24 h, and were 55.71% and 28.04% after the 15th day, respectively. The weight change of ADP@PAA-KHA before and after absorbing water was about 53 times in deionized water and about 4 times in 1 wt% of NaCl salty water. The results show that ADP@PAA-KHA has excellent properties of water retention, salt resistance and slow-release. This will efficiently improve the utilization of fertilizer and reduce the irrigation water consumption at the same time.

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Speciation of Chromium Compounds from Zsm-5 into an Ionic Liquid

Huang

Wei

2021

J Appl Spectrosc

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Reduction of toxic Cr(VI)-humic acid in an ionic liquid

Cited by 18 publications

References 35 publications

Effect of TOC Concentration of Humic Substances as an Electron Shuttle on Redox Functional Groups Stimulating Microbial Cr(VI) Reduction

Effect of TOC Concentration of Humic Substances as an Electron Shuttle on Redox Functional Groups Stimulating Microbial Cr(VI) Reduction

Water-Preserving and Salt-Resistant Slow-Release Fertilizers of Polyacrylic Acid-Potassium Humate Coated Ammonium Dihydrogen Phosphate

Speciation of Chromium Compounds from Zsm-5 into an Ionic Liquid

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