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Effect of pH on the adsorption of arsenic(V) and antimony(V) by the black soil in three systems: Performance and mechanism.
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.ecoenv.2019.110145
Yurui Fan 1 , Chunli Zheng 2 , Hongxia Liu 1 , Chi He 1 , Zhenxing Shen 1 , Tian C Zhang 3
Affiliation  

Arsenic (As) and antimony (Sb) are listed as the priority pollutants by the U.S. Environmental Protection Agency (EPA) and the European Union (EU) due to their toxicity and potential carcinogenicity. It is necessary to investigate their adsorption over soil as such a behavior affects their mobility and bioavailability. In this study, the effect of pH on the adsorption of As(V) and Sb(V) by the black soil was investigated with three systems: the Single system, Binary system, and Sequence system. The operating pH was set at 4.0, 7.0 and 10.0. Based on the Langmuir isothermal and the pseudo-second-order kinetic models, the adsorption for As(V) was always better than Sb(V) in the whole pH range; the best adsorption performance for the two sorbates was achieved at pH of 4.0, followed by 7.0 and 10.0 in the three systems. The reasons could be that the atomic radius of arsenic is smaller than that of antimony, and the positively charged functional groups carried by the inorganic colloids in the soil contributed to binding with the negatively charged As(V)/Sb(V). A lower pH promoted the inorganic colloids to carry more positive charges. Compared to Single system, the maximum adsorption capacity (qm) and the initial adsorption rates (k2qe,cal2) of As(V) and Sb(V) in Binary system decreased obviously, suggesting competitive adsorption occurred when As(V) and Sb(V) coexisted. The findings of this workimprove the understanding of As(V)/Sb(V) adsorption behavior in soil under different situations and would facilitate a comprehensive evaluation on the risk assessment of arsenic and antimony.

中文翻译:

pH对黑土在三个系统中吸附砷(V)和锑(V)的影响:性能和机理。

砷(As)和锑(Sb)由于其毒性和潜在的致癌性,被美国环境保护署(EPA)和欧盟(EU)列为主要污染物。有必要研究它们在土壤上的吸附,因为这种行为会影响其迁移率和生物利用度。在这项研究中,研究了pH对黑土吸附As(V)和Sb(V)的影响,采用三种系统:单系统,二元系统和顺序系统。操作pH设定为4.0、7.0和10.0。基于Langmuir等温和拟二级动力学模型,在整个pH范围内,As(V)的吸附始终优于Sb(V)。在4.0的pH值下,两种吸附剂的最佳吸附性能达到最佳,然后在三个系统中分别达到7.0和10.0。原因可能是砷的原子半径小于锑的原子半径,并且土壤中无机胶体携带的带正电的官能团有助于与带负电的As(V)/ Sb(V)结合。较低的pH值促进了无机胶体携带更多的正电荷。与单体系相比,二元体系中As(V)和Sb(V)的最大吸附容量(qm)和初始吸附率(k2qe,cal2)明显降低,表明当As(V)和Sb( V)共存。这项工作的发现增进了人们对不同情况下土壤中As(V)/ Sb(V)吸附行为的理解,并有助于对砷和锑的风险评估进行综合评估。土壤中无机胶体携带的带正电的官能团有助于与带负电的As(V)/ Sb(V)结合。较低的pH值促进了无机胶体携带更多的正电荷。与单体系相比,二元体系中As(V)和Sb(V)的最大吸附容量(qm)和初始吸附率(k2qe,cal2)明显降低,表明当As(V)和Sb( V)共存。这项工作的发现增进了人们对不同情况下土壤中As(V)/ Sb(V)吸附行为的理解,并有助于对砷和锑的风险评估进行综合评估。土壤中无机胶体携带的带正电的官能团有助于与带负电的As(V)/ Sb(V)结合。较低的pH值促进了无机胶体携带更多的正电荷。与单体系相比,二元体系中As(V)和Sb(V)的最大吸附容量(qm)和初始吸附率(k2qe,cal2)明显降低,表明当As(V)和Sb( V)共存。这项工作的发现增进了人们对不同情况下土壤中As(V)/ Sb(V)吸附行为的理解,并有助于对砷和锑的风险评估进行综合评估。较低的pH值促进了无机胶体携带更多的正电荷。与单体系相比,二元体系中As(V)和Sb(V)的最大吸附容量(qm)和初始吸附率(k2qe,cal2)明显降低,表明当As(V)和Sb( V)共存。这项工作的发现增进了人们对不同情况下土壤中As(V)/ Sb(V)吸附行为的理解,并有助于对砷和锑的风险评估进行综合评估。较低的pH值促进了无机胶体携带更多的正电荷。与单体系相比,二元体系中As(V)和Sb(V)的最大吸附容量(qm)和初始吸附率(k2qe,cal2)明显降低,表明当As(V)和Sb( V)共存。这项工作的发现增进了人们对不同情况下土壤中As(V)/ Sb(V)吸附行为的理解,并有助于对砷和锑的风险评估进行综合评估。
更新日期:2020-01-15
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