摘要
以城市污水厂脱水污泥为原料,采用添加发泡剂辅助的方法制备了污泥基吸附剂,并对部分污泥基吸附剂进行3 mol/L HNO3改性,研究了2种改性污泥基吸附剂对Cr(Ⅵ)的吸附行为.结果表明:HNO3改性改善了污泥基吸附剂对Cr(Ⅵ)的吸附性能,p H是影响污泥基吸附剂吸附去除Cr(Ⅵ)的关键因素,最适p H在1.0-3.0,最佳吸附时间为3 h.25℃下改性污泥基吸附剂吸附Cr(Ⅵ)符合Langmuir吸附模型,准二级动力学模型能很好地描述HNO3改性前后污泥基吸附剂的吸附行为。
Using the dewatered sludge from municipal wastewater treatment plant( WWTP),the sludge-based adsorbent( SBA) was prepared by means of carbonization with the addition of foaming agent,and the prepared adsorbent was further modified with 3 mol / L nitric acid. The adsorption behavior of two SBAs was compared for Cr( Ⅵ)removal. The results showed that the adsorption performance of SBA modified with nitric acid was improved. The p H value was a key factor for Cr( Ⅵ) removal by SBA and the optimum p H value was in the range of 1. 0 to 3. 0,the optimum adsorption time was 3 h. The SBA modified with nitric acid for Cr( Ⅵ) removal fitted well with the Langmuir isotherm model at 25℃. The sorption kinetic data fitted well with a pseudo-second-order model for two SBAs.
出处
《华南师范大学学报(自然科学版)》
CAS
北大核心
2015年第1期50-54,共5页
Journal of South China Normal University(Natural Science Edition)
基金
国家自然科学基金项目(41372050)
广东省高校优秀青年创新人才培养计划资助项目(2012LYM_0050)