Department of Water Supply and Sewerage, Panipokhari, Kathmandu, Nepal.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(13):1533-8. doi: 10.1080/10934529.2011.609376.
Adsorption is a technology used to remove arsenic from water contaminated at levels above drinking water standards. In this study, New Zealand Iron-Sand (NZIS), a naturally-available adsorbent was investigated for its efficiency in removing both As (III) and As (V). Several batch tests were conducted with different concentrations of arsenic at different pH conditions. During the batch tests, the maximum adsorption of As (III) occurred at a pH of 7.5, while As (V) adsorption reached its maximum value at a pH of 3. Both Langmuir and Freundlich adsorption models were found to fit with R(2) values greater than 0.92. From the Langmuir adsorption model, the maximum adsorption capacity of NZIS for As (III) and As (V) were estimated to be 1,250 and 500 μg/g, respectively. These values were substantial enough to consider NZIS a promising new adsorbent for arsenic removal.
吸附技术用于去除饮用水标准以上污染水中的砷。在这项研究中，研究了一种天然存在的吸附剂新西兰铁砂（NZIS），以评估其去除砷（III）和砷（V）的效率。在不同 pH 值条件下，进行了不同浓度砷的多批实验。在批处理实验中，在 pH 值为 7.5 时，砷（III）的最大吸附发生，而砷（V）的吸附在 pH 值为 3 时达到最大值。两种 Langmuir 和 Freundlich 吸附模型均拟合度良好，R(2) 值大于 0.92。从 Langmuir 吸附模型，估计 NZIS 对砷（III）和砷（V）的最大吸附容量分别为 1,250 和 500 μg/g。这些值足以考虑 NZIS 是一种很有前途的新型砷去除吸附剂。
