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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Arsenic Removal Using a Biopolymer Chitosan Sorbent
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Arsenic Removal Using a Biopolymer Chitosan Sorbent

机译：使用生物聚合物壳聚糖吸附剂去除砷

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摘要

An agricultural waste, chitosan, was converted to bead form to evaluate the feasibility of its use to remove As(Ⅲ) and As(V) from water in both batch and continuous operations. In batch tests, the effect of pH, temperature, coexisting ions, and arsenic concentrations were studied. Studies of kinetic adsorption, recovery of arsenic by desorption solution, and reuse of chitosan beads were also carried out. Additionally, wastewater containing arsenic discharged from the manufacturing of GaAs supports was treated in a continuous operation. Results indicated that chitosan beads favored the adsorption of As(V), but not As(Ⅲ). The optimal pH value for As(Ⅲ) and As(V) removal was near 5. The insignificant difference for As(V) and As(Ⅲ) adsorption by chitosan beads was found in the 25-40℃ range. Ion coexistence below 50 mg/L did not affect arsenic removal. The optimal desorption solution for the arsenic recovery was H_2SO_4 with a 71% efficiency for As(V), which was amenable to efficient regeneration for multiple reuse (about 15 times). In continuous tests, the chitosan bead column exhibited excellent arsenic removal from actual wastewater without any pretreatment. The results provide strong evidence of the promise the application of chitosan bead has for arsenic removal.
机译：将农业废弃物壳聚糖转化为珠粒形式，以评估其在间歇和连续操作中从水中去除As（Ⅲ）和As（V）的可行性。在批处理测试中，研究了pH，温度，共存离子和砷浓度的影响。还进行了动力学吸附，解吸溶液中砷的回收以及壳聚糖珠的再利用的研究。另外，以连续操作方式处理了从制造GaAs载体中排出的含砷废水。结果表明，壳聚糖珠粒有利于As（V）的吸附，而不是As（Ⅲ）的吸附。去除As（Ⅲ）和As（V）的最佳pH值接近5。壳聚糖珠粒对As（V）和As（Ⅲ）的吸附差异不明显，在25-40℃范围内。低于50 mg / L的离子共存不会影响砷的去除。砷回收的最佳解吸溶液是H_2SO_4，As（V）的效率为71％，适于多次再生（约15次）的有效再生。在连续测试中，壳聚糖微珠柱在不进行任何预处理的情况下，即可从实际废水中去除砷。结果提供了有力的证据证明应用壳聚糖微珠具有去除砷的前景。

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