School of Chemistry, Key Laboratory of Rare-scattered Elements of Liaoning Province, Liaoning University, Shenyang 110036, PR China.
J Hazard Mater. 2011 Feb 28;186(2-3):1855-61. doi: 10.1016/j.jhazmat.2010.12.077. Epub 2010 Dec 22.
Astringent persimmon was chemically cross-linked by formaldehyde to obtain a novel kind of adsorption gel, which was named as APF gel. The adsorption behaviors of Mo(VI) and Re(VII) along with other coexisting metals onto the APF gel were studied in the present paper. The APF gel was found to be effective for the adsorption of Mo(VI) while the gel is almost completely inert toward rhenium and calcium over the whole hydrochloric acid concentration region. The APF gel has a low affinity for iron, copper, lead, nickel, manganese and zinc ions when the concentration of HCl is higher than 1 mol/L. The gel exhibited selectivity only for Mo(VI) with a remarkably high adsorption capacity 1.05 mol/kg, and the adsorption behavior obeys the Langmuir model. According to the thermodynamic and kinetic studies, the endothermic adsorption process followed pseudo-second order kinetics. Also, its excellent adsorption characteristics for Mo(VI) were confirmed by the adsorption and elution tests using a column packed with the APF gel. The result provides a new approach for the recovery of Mo(VI) from a industrial waste effluent.
涩柿子通过甲醛化学交联得到一种新型吸附凝胶，命名为 APF 凝胶。本文研究了 Mo(VI)和 Re(VII)以及其他共存金属在 APF 凝胶上的吸附行为。APF 凝胶对 Mo(VI)的吸附是有效的，而在整个盐酸浓度区域内，凝胶对铼和钙几乎完全惰性。当 HCl 浓度高于 1mol/L 时，凝胶对铁、铜、铅、镍、锰和锌离子的亲和力较低。凝胶对 Mo(VI)表现出选择性，吸附容量高达 1.05mol/kg，吸附行为符合朗缪尔模型。根据热力学和动力学研究，吸附过程是吸热的，遵循准二级动力学。此外，通过使用填充有 APF 凝胶的柱进行的吸附和洗脱试验，证实了其对 Mo(VI)的优异吸附特性。该结果为从工业废水中回收 Mo(VI)提供了一种新方法。
