Lanthanum hydroxide: a highly efficient and selective adsorbent for arsenate removal from aqueous solution
作者： Yulong Wang , Yanhong Liu , Tianqi Guo , Hupeng Liu , Jiale Li
DOI: 10.1007/S11356-020-10240-1
关键词:
摘要: In the present work, a lanthanum hydroxide adsorbent was prepared by simple precipitation process, and its arsenic removal performances adsorption mechanisms were investigated batch experiments various techniques including field emission scanning electron microscopy with energy-dispersive X-ray spectrophotometry (FESEM-EDX), Brunauer-Emmett-Teller (BET) analysis, powder diffraction (p-XRD), Fourier transform infrared spectroscopy (FTIR), photoelectron (XPS). The influence of pH on showed that can effectively remove As(V) from solution, whereas As(III) very low, indicating selectively but not As(III). isotherm study maximum capacities at 5.0 9.0 299.4 192.3 mg/g, respectively, much higher than those widely used ferrihydrite. Significant interference caused presence phosphate natural organic acids (NOAs), such as citric acid. Powder XRD, FTIR, XPS analysis almost transformed into arsenate after 4.0, while portion remained 6.0 9.0. Furthermore, ligand exchange between hydroxyl groups formation inner-sphere surface complexes could play central role in which needs further investigation.
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