改性柚子皮对镉离子的吸附及动力学研究  

Study on Adsorption and Kinetics of Cadmium Ion on Modified Grapefruit Peel

作　　者：刘立华[1] 刘爽[1] 沈玉龙[1] 贾静娴[1] 刘会媛[1] Liu Lihua;Liu Shuang;Shen Yulong;Jia Jingxian;Liu Huiyuan(Department of Chemistry,Tangshan Normal College,Tangshan 063000,China)

机构地区：[1]唐山师范学院化学系,河北唐山063000

出　　处：《南开大学学报（自然科学版）》2020年第2期38-44,共7页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：河北省高等教育教学改革研究与实践项目(2016GJJG181);唐山师范学院项目(2014001031)。

摘　　要：以生物质废弃物柚子皮为原料对工业废水中的镉离子进行吸附.考察金属离子初始浓度、吸附剂用量、溶液pH、吸附温度和吸附时间对镉离子的吸附情况,从而确定最佳的吸附条件,并对吸附性能进行动力学研究.结果表明,吸附温度为25℃、溶液pH=5、吸附剂的用量为7 g·L^-1、吸附时间为120 min、镉离子的初始浓度100 mg·L^-1条件下,柚子皮对镉离子的吸附率达到96.45%以上;通过用准一级动力学模型和准二级动力学模型进行数据拟合,结果显示吸附反应符合准二级动力学方程;红外光谱结果显示,参与吸附反应的主要官能团为羟基、羰基和羧基.Cadmium ion in industrial wastewater was adsorbed by biomass waste grapefruit peel. To determine the best adsorption conditions, the initial concentration of metal ions, the amount of adsorbent,pH of solution, the adsorption temperature and and the adsorption time were investigated in the paper. The adsorption kinetics was studied at the same time. The experimental results showed that under the conditions of adsorption temperature 25 ℃, solution p H 5, adsorbent dosage 7 g · L^-1, adsorption time 120 min and initial concentration of cadmium ion 100 mg · L^-1, the adsorption rate of cadmium ion from grapefruit peel was above 96.45%. By using the quasi-first-order kinetic model and the quasi-second-order kinetic model, the results showed that the adsorption reaction accords with the quasi-second-order kinetic equation. The infrared spectra showed that the main functional groups involved in the adsorption reaction were hydroxyl, carbonyl and carboxyl groups.

关 键 词：柚子皮 镉离子 吸附 

分 类 号：O657.32[理学—分析化学]