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利用茶叶渣和膨润土为原料,通过水热合成法制备新型复合材料,评价该材料对饮水中硝酸盐的吸附效果。试验结果表明,材料的制备条件对硝酸盐去除率有较大影响,茶叶渣和膨润土经5%盐酸酸化后,将1.5g的混合粉末(茶叶渣和膨润土的质量比为1∶1)加入到100mL浓度为1.0mol/L的氯氧化锆溶液中,经0.03mol/L的十六烷基三甲基溴化铵修饰后制备的复合材料,对25mg/L硝酸盐的吸附效果最好,其最大去除率为44.9%。相对原材料,硝酸盐去除率分别提高6.4倍和7.9倍。另外,溶液特征也对硝酸盐去除率有一定影响,当pH为2.0、吸附剂剂量为20g/L、反应时间为120min、硝酸盐初始浓度为150mg/L时,改性茶叶渣/膨润土复合材料对硝酸盐的最大吸附量为13.07mg/g。
Using tea leaves and bentonite as raw materials, a new type of composite material was prepared by hydrothermal synthesis, and the adsorption effect of this material on nitrate in drinking water was evaluated. The test results show that the preparation conditions of the materials have a significant impact on the removal rate of nitrate. After the tea leaves and bentonite are acidified with 5% hydrochloric acid, 1.5 g of the mixed powder (the mass ratio of tea leaves and bentonite is 1: 1) 100mL 1.0mol / L zirconium oxychloride solution, 0.03mol / L cetyltrimethylammonium bromide modified composite prepared by the best 25mg / L nitrate adsorption effect, which The maximum removal rate is 44.9%. Relative to raw materials, nitrate removal rate increased 6.4 times and 7.9 times. In addition, the characteristics of the solution also affected the nitrate removal rate. When the pH value was 2.0, the adsorbent dosage was 20 g / L, the reaction time was 120 min and the initial nitrate concentration was 150 mg / L, the modified tea leaves / bentonite composites The maximum adsorption of nitrate was 13.07 mg / g.