Chemically Modified Sawdust as Renewable Adsorbent for Arsenic Removal from Water
Chemically Modified Sawdust as Renewable Adsorbent for Arsenic Removal from Water
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DOI：
10.1021/sc500458x
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发表时间：
2014-11
影响因子：
8.4
通讯作者：
D. Setyono;S. Valiyaveettil
中科院分区：
文献类型：
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作者：
D. Setyono;S. Valiyaveettil
为了去除地下水中的污染物，需要环境友好且具有成本效益的砷提取吸附材料。在这里，镧或锆氧化物纳米颗粒掺入木屑用于从水中去除砷阴离子。对化学改性木屑进行了充分的表征，并用于从水中提取砷。研究了离子强度、pH值和干扰离子对砷离子萃取效率的影响，并探讨了其机理。ZrO 2-锯末对亚砷酸根和砷酸根阴离子的萃取能力分别为29和12 mg/g，而La 2 O3-锯末对亚砷酸根和砷酸根阴离子的萃取能力分别为22 mg/g和28 mg/g。对表面改性的锯末进行解吸研究，以检查可回收性。La_2O_3-木屑可以完全再生，除砷效率没有变化，而ZrO_2-木屑保留约50%的吸附效率。这种改性的可再生生物吸附剂是有用的。
Environmentally friendly and cost-effective adsorbent materials for arsenic extraction are needed for removing pollutants from groundwater. Here, lanthanum or zirconium oxide nanoparticle-incorporated sawdust was used for the removal of arsenic anions from water. The chemically modified sawdust was fully characterized and used for extraction of arsenic from water. The influences of ionic strength, pH, and interfering ionic pollutants toward the extraction efficiency of arsenic anions were investigated to understand the mechanism. ZrO2-sawdust showed extraction capacities of 29 and 12 mg/g for arsenite and arsenate anions, respectively, while La2O3-sawdust extracted arsenite (22 mg/g) and arsenate (28 mg/g) anions efficiently. Desorption studies were performed on surface-modified sawdust to check the recyclability. La2O3-sawdust can be fully regenerated with no change in arsenic removal efficiency, while ZrO2-sawdust retains ∼50% of its adsorption efficiency. Such modified renewable bioadsorbents are usefu...