Mg-doped nano ferrihydrite-A new adsorbent for fluoride removal from aqueous solutions
Mg-doped nano ferrihydrite-A new adsorbent for fluoride removal from aqueous solutions
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DOI：
10.1016/j.apsusc.2011.12.047
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发表时间：
2012-03-01
影响因子：
6.7
通讯作者：
Mishra, B. K.
中科院分区：
文献类型：
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作者：
Mohapatra, M.;Hariprasad, D.;Mishra, B. K.
本研究评估了合成的镁掺杂纳米水铁矿粉末作为从水溶液中去除 F 的吸附剂。在受控条件下采用共沉淀法制备了高比表面积镁掺杂水铁矿。通过在 0.39-1.12% 范围内改变 Mg 含量来制备样品。初步测试工作表明，在相似条件下，随着掺杂水铁矿中Mg含量从0.39%增加到0.98%，F-吸附%从66%增加到91%。因此，该样品通过 XRD、TEM、SAED 和 TG-DTA 进行了表征。通过改变接触时间（30-480 分钟）、初始 pH（1.0-10）、初始氟化物浓度（10-150 mg/L）、吸附剂剂量（0.5-4 g/L）、温度（20-45 摄氏度）和 Cl- 或 SO42- 浓度（无至 50 mg/L）进行批量吸附实验。结果表明，0.98% Mg 掺杂的水铁矿是一种优异的氟化物吸附剂，最大吸附容量为 64 mg/g。时间数据很好地符合伪二级动力学模型。等温数据遵循 Langmuir 模型。热力学参数证实吸附过程是自发且吸热的。使用 1 M NaOH 可以从上样样品中解吸 89% 的氟化物。 (C) 2011 Elsevier B.V. 保留所有权利。
The present study evaluates synthesized Mg-doped nano ferrihydrite powder as an adsorbent for F- removal from aqueous solutions. High surface area Mg-doped ferrihydrite was prepared by co-precipitation method under controlled conditions. Samples were prepared by varying Mg content in the range of 0.39-1.12%. Preliminary test work revealed that under similar conditions, with the increase in Mg content from 0.39 to 0.98% in doped ferrihydrite, % F- adsorption increased from 66 to 91%. Hence this sample was characterized by XRD, TEM, SAED and TG-DTA. Batch adsorption experiments were carried out by varying contact time (30-480 min), initial pH (1.0-10), initial fluoride concentration (10-150 mg/L), adsorbent dose (0.5-4 g/L), temperature (20-45 degrees C) and Cl- or SO42- concentrations (nil to 50 mg/L). The results showed 0.98% Mg-doped ferrihydrite to be an excellent fluoride adsorbent giving maximum adsorption capacity of 64 mg/g. The time data fitted well to pseudo second order kinetic model. The isothermal data followed Langmuir model. Thermodynamic parameters confirmed the adsorption process to be spontaneous and endothermic. 89% of fluoride could be desorbed from loaded sample using 1 M NaOH. (C) 2011 Elsevier B.V. All rights reserved.