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首页> 外文期刊>Environmental Science & Technology >Groundwater Arsenic Adsorption on Granular TiO_2: Integrating Atomic Structure, Filtration, and Health Impact
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Groundwater Arsenic Adsorption on Granular TiO_2: Integrating Atomic Structure, Filtration, and Health Impact

机译：TiO_2颗粒对地下水砷的吸附：原子结构，过滤和健康影响的综合

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摘要

A pressing challenge in arsenic (As) adsorptive filtration is to decipher how the As atomic surface structure obtained in the laboratory can be used to accurately predict the field filtration cycle. The motivation of this study was therefore to integrate molecular level As adsorption mechanisms and capacities to predict effluent As from granular TiO_2 columns in the field as well as its health impacts. Approximately 2,955 bed volumes of groundwater with an average of 542μg/L As were filtered before the effluent As concentration exceeded 10μg/L, corresponding to an adsorption capacity of 1.53 mg As/g TiO_2. After regeneration, the TiO_2 column could treat 2,563 bed volumes of groundwater, resulting in an As load of 1.36 mg/g TiO_2. Column filtration and EXAFS results showed that among coexisting ions present in groundwater, only Ca~(2+), Si(OH)_4, and HCO_3~- would interfere with As adsorption. The compound effects of coexisting ions and molecular level structural information were incorporated in the PHREEQC program to satisfactorily predict the As breakthrough curves. The total urinary As concentration from four volunteers of local residences, ranging from 972 to 2,080μg/L before groundwater treatment, decreased to the range 31.7-73.3μg/L at the end of the experimental cycle (15- 33 days).
机译：砷（As）吸附过滤的一个紧迫挑战是破译如何在实验室获得的As原子表面结构可用于准确预测现场过滤周期。因此，这项研究的目的是整合分子水平As的吸附机理和预测本领域颗粒TiO_2柱中废水As的能力及其对健康的影响。在废水中As的浓度超过10μg/ L之前，过滤了约2955床体积的平均542μg/ L As的地下水，相当于1.53 mg As / g TiO_2的吸附量。再生后，TiO_2色谱柱可处理2,563床体积的地下水，导致As负载为1.36 mg / g TiO_2。柱过滤和EXAFS结果表明，在地下水中共存的离子中，只有Ca〜（2 +），Si（OH）_4和HCO_3〜-会干扰As的吸附。 PHREEQC程序结合了共存离子的复合效应和分子水平的结构信息，可以令人满意地预测As突破曲线。在实验周期结束时（15-33天），来自四名当地居民的尿液总砷浓度在地下水处理之前为972至2,080μg/ L，降至31.7-73.3μg/ L。

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  • 来源
    《Environmental Science & Technology》 |2015年第16期|9707-9713|共7页
  • 作者

    Shan Hu; Qiantao Shi; Chuanyong Jing;

  • 作者单位

    State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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