Biswas Biplob Kumar, Inoue Katsutoshi, Ghimire Kedar Nath, Ohta Shingo, Harada Hiroyuki, Ohto Keisuke, Kawakita Hidetaka
Department of Applied Chemistry, Saga University, Honjo 1, Saga 840-8502, Japan.
J Colloid Interface Sci. 2007 Aug 15;312(2):214-23. doi: 10.1016/j.jcis.2007.03.072. Epub 2007 Apr 6.
Phosphate removal from an aquatic environment was investigated using La(III)-, Ce(III)- and Fe(III)-loaded orange waste. The adsorption isotherm, the kinetics of adsorption and the effect of pH on the removal of phosphate have been examined. The % removal of phosphate using La(III)- and Ce(III)-loaded orange waste gel increases with increasing pH within the range of 5-7 but decreases when the pH is increased beyond this range. The equilibrium sorption was observed to be in accordance with Langmuir type adsorption and the maximum adsorption capacity was evaluated as 13.94 mg P/g of dry gel for all the three types of gels. Kinetic studies revealed that 15 h is enough to reach equilibrium in batch experiments. Fixed bed sorption experiments confirmed the continuous phosphate adsorption and elution capability of such simply modified gels. Due to their low cost, availability and significantly high adsorption capability, metal-loaded SOW gels can be effectively employed for the removal of phosphate from water.
使用负载镧（III）、铈（III）和铁（III）的橙子废料研究了从水生环境中去除磷酸盐的情况。研究了吸附等温线、吸附动力学以及pH对磷酸盐去除效果的影响。在5 - 7范围内，使用负载镧（III）和铈（III）的橙子废料凝胶对磷酸盐的去除率随pH升高而增加，但当pH超过此范围时则下降。观察到平衡吸附符合朗缪尔型吸附，所有三种类型的凝胶的最大吸附容量评估为13.94 mg P/g干凝胶。动力学研究表明，在间歇实验中15小时足以达到平衡。固定床吸附实验证实了这种简单改性凝胶对磷酸盐的连续吸附和洗脱能力。由于其低成本、易获得性和显著高的吸附能力，负载金属的橙子废料凝胶可有效地用于从水中去除磷酸盐。
