JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jianle Wang,Xueming Liu,Zhihua Zhu,Le Yuan,Dongye Zhao,Hong Deng,Zhang Lin
High concentrations of Cr(VI) are often detected in contaminated soil. Yet, cost-effective remediation technologies have been lacking. In this study, we prepared a type of FeS x based on commercial FeSO 4 .7H 2 O and CaS x and tested a microwave-assisted technology based on FeS x for reductive immobilization of high concentrations of Cr(VI) in a field contaminated soil. The as-prepared FeS x particles appeared as a honeycomb-like and highly porous structure. The microwave-assisted FeS x reduction process was able to rapidly reduce the TCLP-based reachability of Cr(VI) from 391.8 to 2.6 mg·L -1 . The dosage of FeS x , S/Fe molar ratio, initial moisture content, microwave power, and irradiation time can all affect the treatment effectiveness. After 500 days curing under atmospheric conditions, the TCLP-leached concentration of Cr remained below the regulatory limit of 5 mg·L -1 , while other treatments failed to meet the goal. S x 2- or S 2- served as the primary electron donors, whereas Fe facilitated the microwave absorption and the formation of the stable final product of FeCr 2 O 4 . S and Fe are mostly precipitated in soil. The microwave-assisted FeS x reduction was shown to be an effective approach to rapidly reduce the leachability of Cr(VI) in contaminated soil, especially in heavily contaminated soil.
研究领域:
环境科学
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土壤修复
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Miao Jiang,Kun Wang,Gen Li,Qingliang Zhao,Weiye Wang,Junqiu Jiang,Yipeng Wang,Luzi Yuan
Co-contamination of As, Sb, and Pb in soil has aroused public concern due to their wide application in industries. However, the efficient stabilization materials with simultaneous cations and anions stabilization capacities are still lacking and remain a challenge. Herein, a new type of montmorillonite modified by amorphous ferrihydrite ( [email protected] ) was synthesized and the immobilization performance of [email protected] for As, Sb, and Pb in soil was investigated comprehensively, mainly by TCLP, SBET, and DTPA extraction. The stabilization efficiency assessed by TCLP reached 86.28 % for Sb and 94.60 % for Pb after 56 days, and the As could not be detected in the leachate after 10 days. For As, Sb and Pb, the SBET method achieved a reduction of 87.34 %, 54.59 % and 17.59 % respectively. The DTPA extractable content of the metal(loid)s also declined significantly, especially for As. By applying [email protected] , the soil properties as well as the bacterial richness and diversity in the soil were obviously improved. The [email protected] adsorption data are well fitted to the Langmuir model and the pseudo-second-order model. The principal stabilization mechanisms were ascribed to inner-sphere complexation, surface precipitation and co-precipitation, and structural incorporation into [email protected] This is the first study to exhibit the feasibility of [email protected] as an effective and environmentally friendly stabilizer for remediation of As/Sb/Pb co-contaminated soils.
研究领域:
环境科学
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土壤修复
·
地球化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2015
·Vol. 32
·期 9
·816-823
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IF 0.991
Yafeng Ren,Jianxin Zhu
A large volume of waste mercury chloride catalyst (HgCl2) is generated by calcium carbide-based polyvinyl chloride production in China, which accounts for 30% of global mercury consumption. However, there are few studies on the leaching behavior and risk control of waste catalyst where mercury is in the form of HgCl2, which is more soluble than metal mercury and poses great threat to human health and environment. This study investigated mechanochemical stabilization and leaching behavior of waste mercury catalyst using sulfur as additive. We found that mercuric sulfide (HgS) formed through mechanical milling, although the reaction between HgCl2 and S is not thermodynamically favored. Moreover, toxicity characteristic leaching procedure (TCLP) results showed mercury leaching values are lower than the TCLP limit value of 0.2 mg/L after mechanochemical treatment. Results of sequential extraction procedure showed that ball mill could transfer more than 99.9% of the Hg in the catalyst to the least mobile fraction.
研究领域:
环境科学
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化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Kun Jiang,Aihua Xiang,Kun Liu,Qian Peng
Pb and Zn pollution for soil are becoming more and more serious, strengthening the treatment of contaminated soils is conducive to the sustainable development of soil. In this study, the humus-like substances modified montmorillonite (HLS-MMT) were synthesized to remediate the Pb and Zn-contaminated soils. The application of HLS-MMT in simulated and actual contaminated soil were carried, and the long-term stability of HLS-MMT was evaluated. The results showed that the mobility, bioavailability and leachability of heavy metals (HMs) significantly decreased after remediating by HLS-MMT. Compared with MMT, the TCLP leaching ratio ( TLr ) of Pb and Zn reduced by 9.27–13.96% and 10.3–13.18%, while the DTPA effectiveness ( DEr ) Pb and Zn reduced by 9.11% and 8.76% in simulated soil, respectively. Moreover, the aging experiments proved that HLS-MMT possessed a stability to resistance the freeze-thaw cycles, wet and dry alternation, and acid rain leaching. This article provides some theoretical basis for the soil remediation .
研究领域:
环境科学
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土壤学
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污染控制
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Le Yuan,Jianle Wang,Zuqi Zhong,Jiguang Li,Hong Deng
Sb(III) is often detected in contaminated soil and groundwater. Hence, high-efficiency technology is needed. In this study, bimetallic organic frameworks were used for the first time to immobilize Sb(III) from contaminated soil and groundwater. The materials were synthesized by the hydrothermal method. Both ends of the prepared material were hexagonal tip rods, and the length became shorter as the ratio of Fe/Mg decreased. The bimetallic organic framework with a Fe/Mg feeding ratio of 0.5 was the optimum material for Sb(III) removal, which could effectively immobilize Sb(III). The adsorption isotherm was fitted well with the Freundlich model, and the optimal adsorption capacity can reach 106.97 mg/g. The adsorption capacity of 84% can be completed in 10 min, which conformed to the pseudo-second-order kinetics. The Fe 3+ could enhance the stability of the material, and the Mg 2+ was conducive to freeing up adsorption sites for binding Sb(III) and forming stable chemical adsorption. Ion exchange is the predominant mechanism to remove Sb(III). After 14 days of remediation of Sb(III) contaminated soil, the Toxicity Characteristic Leaching Procedure (TCLP)-leached concentrations of Sb(III) were reduced by 86%, 91% and 94% when the material dosages were 1%, 2% and 3%, respectively. Immobilization of Sb(III) in soil resulted in a conversion of antimony speciation from more easily bioavailable species to less bioavailable species, further contributing to reduce the environmental risk of antimony. The results indicate that ferro-magnesium bimetallic organic frameworks may serve as a kind of promising materials for the immobilization of Sb(III) in contaminated soil and groundwater.
研究领域:
环境科学
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Miao Jiang,Kun Wang,Ruiyuan Xue,Qingliang Zhao,Long Wang,Weiye Wang,Jing Ding
Antimony (Sb) finds its wide application in industries, however, the research on Sb solidification/stabilization (S/S) in the Sb-contaminated soil is currently insufficient, particularly in seasonal freezing regions. Here six composite materials of Fe/Fe 2+ -fly ash-concrete additive (Fe-FA-CA) were employed and optimized to remediate the Sb-contaminated soil subject to 40 freezing-thawing (F-T) cycles. After remediation, FeSO 4 -fly ash-calcium lignosulfonate (FFC) exhibited the best resistance performance to F-T. The stabilization efficiency was evaluated with TCLP at 92.92%. Meanwhile, Sb concentration met the criteria of landfill for inert waste assessed with the compliance test for leaching (CT) of European Standard . The S/S efficiency of Sb dropped slightly from 92.68% to 88.22% (TCLP) and from 97.18% to 93.37% (CT), respectively, after aging 40 F-T cycles. The fraction of residual Sb in the soil treated by FFC was increased by 10.41%, and the strength of the S/S soil was much higher than 350 kPa, the requirement of landfills in the U.S. during F-T cycles. Additionally, the poorly crystalline Fe in the soil remediated by FFC was increased by 4.54 g/kg, suppressing Sb migration. The feasibility and effectiveness of FFC in S/S of Sb demonstrated its potential to remediate Sb-contaminated soil in seasonal freezing regions.
研究领域:
环境科学
·
土壤学
·
材料科学
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）