Gopal V, Elango K P
Tamil Nadu Water Supply and Drainage Board, District Water Testing Laboratory, Theni 625 531, India.
J Hazard Mater. 2007 Mar 6;141(1):98-105. doi: 10.1016/j.jhazmat.2006.06.099. Epub 2006 Jul 1.
Batch sorption system using plaster of Paris as an adsorbent was investigated to remove fluoride ions from aqueous solutions. The system variables studied include initial concentration of the sorbate, agitation time, adsorbent dose, pH, co-ions and temperature. The experimental data fitted well to the Freundlich and Langmuir isotherms. Thermodynamic parameters such as DeltaH degrees , DeltaS degrees and DeltaG degrees were calculated indicating that the adsorption was a spontaneous and exothermic. Kinetic studies reveal that the adsorption is first order. A mechanism involving three stages (external surface adsorption, intraparticle diffusion and final equilibrium) has been proposed for the adsorption of F(-) onto plaster of Paris. XRD patterns of the adsorbent were recorded to get a better in sight into the mechanism of adsorption process.
研究了以巴黎石膏作为吸附剂的间歇吸附系统，用于从水溶液中去除氟离子。所研究的系统变量包括被吸附物的初始浓度、搅拌时间、吸附剂剂量、pH值、共存离子和温度。实验数据与Freundlich和Langmuir等温线拟合良好。计算了诸如ΔH°、ΔS°和ΔG°等热力学参数，表明吸附是自发且放热的。动力学研究表明吸附为一级吸附。已提出了一个涉及三个阶段（外表面吸附、颗粒内扩散和最终平衡）的F(-)在巴黎石膏上吸附的机制。记录了吸附剂的XRD图谱，以便更好地洞察吸附过程的机制。
