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首页> 外文期刊>Journal of Environmental Science and Health >Adsorption and removal of arsenic (Ⅴ) using crystalline manganese (Ⅱ,Ⅲ) oxide: Kinetics, equilibrium, effect of pH and ionic strength
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Adsorption and removal of arsenic (Ⅴ) using crystalline manganese (Ⅱ,Ⅲ) oxide: Kinetics, equilibrium, effect of pH and ionic strength

机译：结晶锰（Ⅱ，Ⅲ）对砷（Ⅴ）的吸附和脱除：动力学，平衡，pH和离子强度的影响

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摘要

Manganese (Ⅱ,Ⅲ) oxide (Mn_3O_4) crystalline powder was evaluated as a potential sorbent for removal of arsenic (Ⅴ) from water. Adsorption isotherm experiments were carried out to determine the adsorption capacity using de-ionized (DI) water, a synthetic solution containing bicarbonate alkalinity, and two natual groundwater samples. Adsorption isotherm data followed the Langmuir and Freundlich equations, indicating favorable adsorption of arsenic (Ⅴ) onto Mn_3O_4, while results from the Dubinin-Radushkevich equation were suggestive of chemisorption of arsenic (Ⅴ). When normalized to the sorbent surface area, the maximum adsorption capacity of Mn_3O_4 for arsenic (Ⅴ) was 101 μg m~(-2), comparable to that of activated alumina. Arsenic (Ⅴ) adsorption onto Mn_3O_4 followed pseudo-second-order kinetics. Adsorption of arsenic (Ⅴ) was greatest at pH 2, while adsorption at pH 7-9 was within 91% of maximum adsorption, whereas adsorption decreased to 32% of maximum adsorption at pH 10. Surface charge analysis confirmed the adsorption of arsenic (Ⅴ) onto the acidic surface of the Mn_3O_4 sorbent with a pH_(PZC) of 7.32. The presence of coexisting ions bicarbonate and phosphate resulted in a decrease in arsenic (Ⅴ) uptake. Comparable adsorption capacities were obtained for the synthetic solution and both groundwater samples. Overall, crystalline Mn_3O_4 was an effective and viable sorbent for removal of arsenic (Ⅴ) from natural water, removing greater than 95% of arsenic (Ⅴ) from a 1 mg L~(-1) solution within 60 min of contact time.
机译：氧化锰（Ⅱ，Ⅲ）（Mn_3O_4）结晶粉末被评价为从水中去除砷（Ⅴ）的潜在吸附剂。使用去离子水，含有碳酸氢盐碱度的合成溶液和两个天然地下水样品进行吸附等温线实验，以确定吸附容量。吸附等温线数据遵循Langmuir和Freundlich方程，表明砷（Ⅴ）在Mn_3O_4上的吸附良好，而Dubinin-Radushkevich方程的结果表明砷（Ⅴ）的化学吸附。当以吸附剂表面积标准化时，Mn_3O_4对砷（Ⅴ）的最大吸附容量为101μgm〜（-2），与活性氧化铝相当。砷（Ⅴ）在Mn_3O_4上的吸附遵循伪二级动力学。在pH 2时，砷（Ⅴ）的吸附最大，而在pH 7-9时，砷的吸附在最大吸附的91％以内，而在pH 10时，吸附量下降到最大吸附的32％。 ）转移到pH_（PZC）为7.32的Mn_3O_4吸附剂的酸性表面上。碳酸氢根离子和磷酸根离子共存会导致砷（Ⅴ）吸收减少。对于合成溶液和两个地下水样品，获得了可比的吸附能力。总体而言，结晶型Mn_3O_4是一种从天然水中去除砷（Ⅴ）的有效且可行的吸附剂，在60分钟的接触时间内从1 mg L〜（-1）溶液中去除了95％以上的砷（Ⅴ）。

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  • 来源
    《Journal of Environmental Science and Health》 |2014年第14期|1462-1473|共12页
  • 作者

    KAMEL BABAEIVELNI; AMID P. KHODADOUST; DORIN BOGDAN;

  • 作者单位

    Department of Civil and Materials Engineering, University of Illlinois at Chicago, Chicago, Illinois, USA;

    Department of Civil and Materials Engineering, University of Illlinois at Chicago, Chicago, IL 60607, USA;

    Department of Civil and Materials Engineering, University of Illlinois at Chicago, Chicago, Illinois, USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Manganese oxide; arsenic (Ⅴ); arsenate; adsorption; pH; ionic strength;

    机译：氧化锰砷（Ⅴ）;砷吸附pH值离子强度;

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