载零价铁壳聚糖纳米球——一种从水系统中去除总无机砷的新型吸附剂。
Zerovalent iron encapsulated chitosan nanospheres - a novel adsorbent for the removal of total inorganic arsenic from aqueous systems.
机构信息
Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, UP 208 016, India.
出版信息
Chemosphere. 2012 Jan;86(2):150-5. doi: 10.1016/j.chemosphere.2011.10.003. Epub 2011 Nov 12.
Evaluation of Chitosan zerovalent Iron Nanoparticle (CIN) towards arsenic removal is presented. Addition of chitosan enhances the stability of Fe(0) nano particle. Prepared adsorbent was characterized by FT-IR, SEM EDX, BET and XRD. It was found that, with an initial dose rate of 0.5 g L(-1), concentrations of As (III) and As (V) were reduced from 2 mg L(-1) to <5 μg L(-1) in less than 180 min and the adsorbent was found to be applicable in wide range of pH. Langmuir monolayer adsorption capacity was found to be 94±1.5 mg g(-1) and 119±2.6 mg g(-1) at pH 7 for As (III) and As (V) respectively. Major anions including sulfate, phosphate and silicate did not cause significant interference in the adsorption behavior of both arsenite and arsenate. The adsorbent was successfully recycled five times and applied to the removal of total inorganic arsenic from real life groundwater samples.
本文介绍了壳聚糖零价铁纳米颗粒（CIN）对砷去除的评估。壳聚糖的添加提高了 Fe(0)纳米颗粒的稳定性。通过 FT-IR、SEM EDX、BET 和 XRD 对制备的吸附剂进行了表征。结果表明，在初始剂量率为 0.5 g L(-1)的条件下，浓度为 2 mg L(-1)的 As(III)和 As(V)在 180 分钟内减少到 <5 μg L(-1)，且该吸附剂适用于较宽的 pH 范围。在 pH 7 时，对 As(III)和 As(V)的单层吸附容量分别为 94±1.5 mg g(-1)和 119±2.6 mg g(-1)。硫酸盐、磷酸盐和硅酸盐等主要阴离子对亚砷酸盐和砷酸盐的吸附行为没有造成显著干扰。该吸附剂已成功回收 5 次，并应用于从实际地下水样品中去除总无机砷。
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