Department of Chemistry, KPR Institute of Engineering and Technology, Arasur, Coimbatore, 641407, India.
Department of Chemistry, PSG College of Technology, Peelamedu, Coimbatore, 641004, India.
Environ Sci Pollut Res Int. 2018 Sep;25(26):26182-26191. doi: 10.1007/s11356-018-2675-x. Epub 2018 Jul 4.
Palm fruit husk, a lignocellulosic material, is an agricultural solid waste. Since raw palm fruit husk does not adsorb V (V), it was subjected to surface modification with a cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The surface-modified palm fruit husk showed adsorption capability for V (V). The maximum adsorption of V (V) takes place at pH 4. Adsorption equilibrium data were fitted to Langmuir, Freundlich, and Dubinin Radushkevich (D-R) isotherm models. Kinetic studies showed that the adsorption data fit second-order kinetic model better than first order. Desorption of V (V) proved that it is feasible to recover V (V) from the spent adsorbent. Effect of coexisting anions like Molybdate, sulfate, nitrate, phosphate, and thiocyanate on the adsorption of V (V) was also studied and the foreign ions compete for the adsorption sites with V (V) anionic species. Quantitative removal of V (V) was achieved from synthetic wastewater.
棕榈果壳是一种木质纤维素材料，是农业固体废物。由于原棕榈果壳不吸附 V(V)，因此用阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）对其进行了表面改性。表面改性后的棕榈果壳具有吸附 V(V)的能力。在 pH 4 时，V(V)的最大吸附量最大。吸附平衡数据拟合了 Langmuir、Freundlich 和 Dubinin Radushkevich（D-R）等温模型。动力学研究表明，吸附数据更符合二级动力学模型，而不是一级动力学模型。V(V)的解吸证明从废吸附剂中回收 V(V)是可行的。还研究了钼酸盐、硫酸盐、硝酸盐、磷酸盐和硫氰酸盐等共存阴离子对 V(V)吸附的影响，这些阴离子与 V(V)阴离子物种竞争吸附位点。从合成废水中实现了 V(V)的定量去除。
