Synthesis, characterization, and potential application of Mn2+-intercalated bentonite in fluoride removal: adsorption modeling and mechanism evaluation
作者： Rabelani Mudzielwana , Wilson M. Gitari , Segun A. Akinyemi , Titus A. M. Msagati
DOI: 10.1007/S13201-017-0608-3
关键词:
摘要: The study synthesizes a low-cost adsorbent made from Mn2+-modified bentonite clay for groundwater defluoridation. clays were characterized using X-ray diffraction, fluorescence, scanning electron microscopy, and Fourier transform infrared techniques. fluoride adsorption capacity of the modified was evaluated batch experiments. kinetics results showed that optimum (F−) uptake achieved within 30 min’ contact time. data fitted well to pseudo-second-order reaction indicating F− occurred via chemisorption. In addition, isotherm Langmuir model on mono-layered surface. Maximum removal 57% with an initial concentration 5.4 mg L−1 natural pH 8.6 dosage 1 g/100 mL. Fluoride through ligands ion exchange mechanisms. synthesized successfully regenerated up five times. shows Mn2+-intercalated has potential application in defluoridation groundwater.
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