Department of Applied Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
J Hazard Mater. 2013 Dec 15;263 Pt 2:342-52. doi: 10.1016/j.jhazmat.2013.04.017. Epub 2013 Apr 17.
Hydrous bismuth oxides (HBOs) have been investigated as a possible adsorbent for fluoride removal from water. Apart from bismuth trioxide (Bi2O3) compound, three additional HBOs, named as HBO1, HBO2, and HBO3 were synthesized in the laboratory and examined for their relative potentials for fluoride removal from aqueous solutions. HBO1 was observed to have highest fluoride removal at 10mg/L initial concentration in aqueous environment. Among competitive anions, sulfate and chloride affect the fluoride removal by HBO1 more adversely than bicarbonate. Characterization of HBOs using X-ray diffraction (XRD) pattern analyses indicated crystalline structures, and the broad chemical composition of materials showed successive increase of Bi(OH)3 from HBO1 to HBO3, with decrease of BiOCl in the same order. Fourier Transform Infrared (FTIR) spectroscopy analyses indicated presence of Bi-O bond and successively increasing number of peaks corresponding to OH ion from HBO1 to HBO3. Scanning Electron Microscopic (SEM) images of HBOs show rough and porous structure of the materials. Presence of higher proportion of chloride compound in HBO1 with respect to others appears to be the factor responsible for its better performance in fluoride removal from aqueous solutions.
水合氧化铋（HBOs）已被研究作为一种可能的吸附剂，用于从水中去除氟化物。除了三氧化二铋（Bi2O3）化合物外，实验室还合成了另外三种 HBOs，分别命名为 HBO1、HBO2 和 HBO3，并研究了它们对水溶液中氟化物去除的相对潜力。在初始浓度为 10mg/L 的水溶液环境中，HBO1 表现出最高的氟化物去除率。在竞争阴离子中，硫酸盐和氯化物对 HBO1 去除氟化物的影响比碳酸氢盐更不利。使用 X 射线衍射（XRD）图谱分析对 HBOs 进行的表征表明了结晶结构，材料的广泛化学成分显示出从 HBO1 到 HBO3 的 Bi(OH)3 连续增加，而在同一顺序中 BiOCl 减少。傅里叶变换红外（FTIR）光谱分析表明存在 Bi-O 键，并且从 HBO1 到 HBO3 的 OH 离子的峰数逐渐增加。HBOs 的扫描电子显微镜（SEM）图像显示出材料的粗糙多孔结构。与其他 HBOs 相比，HBO1 中存在更高比例的氯化物化合物，这似乎是其在水溶液中去除氟化物性能更好的原因。
