Vivek Vardhan C M, Srimurali M
Department of Civil Engineering, Sri Venkateswara University, Tirupati, Andhra Pradesh 517501 India.
Springerplus. 2016 Aug 26;5(1):1426. doi: 10.1186/s40064-016-3112-6. eCollection 2016.
A novel sorbent, Lanthanum-Impregnated Bauxite (LIB), was prepared to remove fluoride from water. To understand the surface chemical composition and morphology, LIB was characterized using X-ray diffraction and scanning electron microscopy techniques. Experiments were performed to evaluate the sorption potential, dose of sorbent, kinetics, equilibrium sorption capacity, pH and influence of anions for defluoridation by LIB. Equilibrium isothermal studies were conducted to model the sorption and regeneration studies were carried out to evaluate the reusability of LIB. The results showed that LIB, at a dose of 2 g/L could remove 99 % of fluoride from an initial concentration of 20 mgF/L. Kinetic studies revealed the best fit of pseudo second order model. The sorption followed Langmuir isotherm model and the maximum sorption capacity of LIB for removal of fluoride was found to be 18.18 mg/g. Naturally occurring pH of water was found to be favorable for sorption. Usually occurring anions in water except nitrates influenced sorption of fluoride by LIB.
制备了一种新型吸附剂镧浸渍铝土矿（LIB）用于去除水中的氟化物。为了解其表面化学成分和形态，采用X射线衍射和扫描电子显微镜技术对LIB进行了表征。进行实验以评估LIB的吸附潜力、吸附剂剂量、动力学、平衡吸附容量、pH值以及阴离子对脱氟的影响。进行平衡等温线研究以模拟吸附过程，并开展再生研究以评估LIB的可重复使用性。结果表明，剂量为2 g/L的LIB能够从初始浓度为20 mgF/L的水中去除99%的氟化物。动力学研究表明伪二级模型拟合效果最佳。吸附遵循朗缪尔等温线模型，LIB去除氟化物的最大吸附容量为18.18 mg/g。发现水的天然pH值有利于吸附。水中除硝酸盐外通常存在的阴离子会影响LIB对氟化物的吸附。
