使用新型去铁胺或二乙烯三胺五乙酸硅胶偶联物从水溶液中去除铬。
Chromium removal from aqueous solutions using new silica gel conjugates of desferrioxamine or diethylenetriaminepentaacetic acid.
机构信息
Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad, Azad Kashmir, 13100, Pakistan.
Department of Fundamental Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, SP, 05508-000, Brazil.
出版信息
Environ Sci Pollut Res Int. 2020 May;27(13):15635-15644. doi: 10.1007/s11356-020-08097-5. Epub 2020 Feb 20.
Desferrioxamine (DFO) and diethylenetriaminepentaacetic acid (DTPA) conjugated with silica gel (IDFOSG and IDTPASG, respectively) were evaluated as adsorbents for chromium in aqueous solutions. Different parameters affecting adsorption such as pH, sorbent dosage, contact time, sample volume and potential of interfering ions have been optimized. The optimum pH for chromium binding was 4 for 100 mg of adsorbents at 5 min of table shaking with 5 mL sample volume of chromium solutions. Langmuir adsorption model described the removal of chromium ions. The adsorption capacity for chromium was 90% for IDFOSG and 83% for IDTPASG in single solutions, and at least 75% in multielemental solutions. Considering the removal efficacy, regeneration and stability, DFO-grafted silica gel was generally superior to its DTPA counterpart and may be applied to the removal of traces of chromium species from natural waters.
去铁胺（DFO）和二乙三胺五乙酸（DTPA）与硅胶偶联（分别为 IDFOSG 和 IDTPASG）被评估为水溶液中铬的吸附剂。研究了影响吸附的各种参数，如 pH 值、吸附剂用量、接触时间、样品体积和潜在干扰离子的电位。对于 100mg 吸附剂，在 5min 表振和 5mL 铬溶液样品体积下，铬结合的最佳 pH 值为 4。Langmuir 吸附模型描述了铬离子的去除。在单一组分溶液中，IDFOSG 对铬的吸附容量为 90%，IDTPASG 为 83%，在多元素溶液中至少为 75%。考虑到去除效率、再生和稳定性，DFO 接枝硅胶通常优于其 DTPA 对应物，可用于从天然水中去除痕量铬物种。
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