Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils

Qiao, Jiangtao; Liu, Tongxu; Wang, Xiang-Qin; Lv, Yahui; Cui, Jianghu; Xiao-duo, Zeng; Yuan, Yuzhen; Liu, Chuanping

doi:10.1016/j.chemosphere.2017.12.081

Cited by 300 publications

(70 citation statements)

References 83 publications

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“…These were chosen as reference criteria because no general guidelines for water-extractable concentrations exist. Other studies that have explored the use of novel iron-modified biochars have found them to be comparable, or even more effective at reducing extractable fractions of As (Qiao et al, 2018;, Cu (Yang et al, 2018a), or Cr (Lyu et al, 2018;Mandal et al, 2017;Zhang et al, 2017); however, none of them looked into the combined effect on CCA-contaminated soil.…”

Section: Effects Of Soil Amendments On Soil Qualitymentioning

confidence: 99%

“…Full remediation is often only possible by excavation, but due to the sheer number and size of contaminated sites worldwide, this approach is seldom feasible (Nielsen et al, 2016). Hence, insitu stabilization by application of different soil amendments has been proposed as a more economical approach for reducing the mobility and toxicity of trace element contaminants (Bolan et al, 2014;Maurice et al, 2007), but the challenge remains to identify suitable soil amendments for multi-element contaminated sites, as the individual elements may respond differently to soil treatments (Kumpiene et al, 2008;Qiao et al, 2018;Silvetti et al, 2014;Zhou and Haynes, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

Frick

Tardif

Kandeler

et al. 2019

Science of The Total Environment

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Highlights  Chromate copper arsenate (CCA) contaminated soils pose risks to the environment  In-situ stabilization of CCA contaminated soil was tested with biochar and ZVI  Soil remediation was evaluated based on chemical and microbiological techniques  Biochar reduced bioavailable (Cu bio), but not water-extractable Cu (Cu water)  Combination of biochar and ZVI most effectively reduced toxic effects of CCA

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Section: Effects Of Soil Amendments On Soil Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

Frick

Tardif

Kandeler

et al. 2019

Science of The Total Environment

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“…The anaerobic conditions in paddy soils favor the mobilization of arsenite, which can be further taken up by rice roots, thus increasing As bioavailability (Qiao et al 2018a;Takahashi et al 2004). In contrast, Cd bioavailability may decrease in flooded paddy soils due to increased pH, precipitation with reduced sulfur or the reduction of Fe(III) oxides in the rhizosphere (Qiao et al 2018b;Yu et al 2016;Zhang et al 2012). Hence, how to simultaneously reduce As and Cd accumulation in rice grain in As-and Cd-contaminated paddy fields remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

“…Biochar and zero-valent iron (ZVI) have been widely used for the remediation of metal-contaminated soils by sorption and immobilization Cantrell et al 1995;Chen et al 2019;Zhang et al 2013;Zou et al 2016). Nevertheless, it seems that single biochar application to As-and Cd-contaminated soil can only immobilize Cd and might increase As bioavailability (Beesley and Marmiroli 2011;Méndez et al 2012;Qiao et al 2018b;Rocco et al 2018). Moreover, single ZVI amendment may result in uncertain consequences for As and Cd bioavailability due to the pH effect and iron corrosion (Kumpiene et al 2006;Qiao et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, it seems that single biochar application to As-and Cd-contaminated soil can only immobilize Cd and might increase As bioavailability (Beesley and Marmiroli 2011;Méndez et al 2012;Qiao et al 2018b;Rocco et al 2018). Moreover, single ZVI amendment may result in uncertain consequences for As and Cd bioavailability due to the pH effect and iron corrosion (Kumpiene et al 2006;Qiao et al 2018b). For remediation of cocontaminated sites, simultaneously reducing metal and metalloid bioavailability is crucial.…”

Section: Introductionmentioning

confidence: 99%

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The applicability of biochar and zero-valent iron for the mitigation of arsenic and cadmium contamination in an alkaline paddy soil

Qiao

Wang

et al. 2019

Biochar

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In paddy fields, the opposing transformation of arsenic (As) and cadmium (Cd) poses many challenges for their simultaneous remediation. In our previous study, we reported that combined biochar and zero-valent iron (ZVI) amendment had great potential for the simultaneous alleviation of As and Cd bioavailability in contaminated acid paddy soil. In this study, an As-and Cd-contaminated alkaline paddy soil was further studied, and the same ZVI-biochar mixtures amendments were applied to evaluate the impact of the mixtures on As and Cd transformation and translocation in the soil-rice system by performing pot experiments with rice. In line with our previous study, the ZVI-biochar composites significantly reduced As and Cd accumulation in different rice tissues, leading to a 42% and 47% decrease in rice grain As and Cd levels, respectively, compared with the control values. The ZVI-biochar mixtures exhibited synergistic effects of biochar and ZVI by enhancing the transformation of bioavailable As and Cd fractions into less bioavailable fractions, and by increasing iron plaque formation to reduce As and Cd bioavailability. Although the bioaccumulation and translocation factors of As and Cd in alkaline paddy soil were generally lower than those in acid paddy soil, particularly in the presence of the ZVI-biochar mixtures, the grain As and Cd levels did not achieve the desired food safety standard levels, probably related to the high soil As content and the small changes in soil pH. Nevertheless, for treating lightly and moderately contaminated paddy soils, ZVI-biochar mixtures can still be a good choice in the future.

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Metal‐Loaded Biochar for the Removal of Arsenic from Water: A Critical Review on Overall Effectiveness, Governing Mechanisms, and Influential Factors

et al. 2022

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Arsenic (As) contamination in water sources is a serious threat to safe drinking water afflicting many developed and developing nations. Among the different water treatment techniques, arsenic removal using metal‐loaded biochar has gained considerable interest as an efficient environmentally sustainable adsorbent. This review critically focuses on an in‐depth analysis of different adsorption mechanisms and various physicochemical properties such as pH, surface area and surface charge, porosity, and functional groups of the metal‐loaded biochar that are significant for As adsorption, which has not been previously described. It centers on addressing the overall effectiveness, governing mechanisms, and influential factors of metal‐loaded biochars for As removal from the aqueous medium. Special consideration on oxidation of arsenite to arsente and its removal was given. The oxidation processes are also effective in reducing arsenic toxicity by oxidation of arsenite to arsenate. A comprehensive insight into the utility of biochar for As removal for future field applications of biochar is delineated.

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Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils

Cited by 300 publications

References 83 publications

Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

The applicability of biochar and zero-valent iron for the mitigation of arsenic and cadmium contamination in an alkaline paddy soil

Metal‐Loaded Biochar for the Removal of Arsenic from Water: A Critical Review on Overall Effectiveness, Governing Mechanisms, and Influential Factors

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