化学预处理氧化铝自溶液中吸附SCN^-的研究

Adsorption Study of Anion SCNTrom Solution on Chemically Pretreated Alumina

用不同浓度的HNO_3预处理Al_2O_3,制取pH为3.7～6.6的Al_2O_3吸附剂,在不同pH、浓度、时间、温度、共存电解质的条件下研究了Al_2O_3吸附SCN^-的规律和特性,并用离子交换机理所解释。近年来、对于氧化铝吸附含氧酸根SeO_4^(2-),CrO_4^(2-),PO_4^(3-)等的研究在国外已有报道,但对于HNO_3预处理氧化铝吸附SCN^-的研究尚未见到。而Al_2O_3大量存在于自然界中,SCN^-性质与卤素相似,能与许多金属络合。故我们用HNO_3预处理层析氧化铝研究了Al_2O_3在不同条件下吸附SCN^-的特性,并推断出该体系主要为离子交换吸附机理。这对于研究其他体系有所启示,并在分离提取、环境保护等实际应用中具有一定意义。

alumina Samples of surface pH 3.7- 6.6 were prepared by treatingchromatographic alumina with varying concentratings of nitric acid. The adsorption characteristics of anion SCN from solution on these sugstrates under a variety of conditions pf pH, concentrations, time, temperature and in presence of the electrolytes was investigated. The process have been interpreted by a predominant ion-exchange mechanism.