黄界颍;胡宏祥;伍震威;徐晓春;丁小龙;

• 1:安徽农业大学资源与环境学院
• 2:安徽省环境监测中心站
• 3:合肥工业大学资源与环境工程学院

摘要(Abstract)：

为了解水稻秸秆和油菜秸秆对废水中Cd2+的吸附特性,研究了吸附时间、初始离子质量浓度、秸秆投加量、初始p H值和振荡速率对溶液中Cd2+去除率与吸附量的影响,通过动力学、热力学模型拟合和扫描电镜(SEM)、红外光谱(FTIR)分析,探讨其吸附机理。结果表明:水稻和油菜秸秆具有良好的Cd2+吸附效果,p H值为4⁷时,Cd2+吸附率均可达到50%以上;在投加量为10 g/L、初始p H值为6、振荡速率为150 r/min、温度为25℃的条件下,处理200 mg/L含Cd2+废水时,水稻和油菜秸秆对Cd2+的去除率分别达到66.5%和68.2%,吸附平衡时间约为90 min;其吸附动力学过程以准二级动力学方程拟合效果最好,等温吸附模型符合Langmuir方程,在25℃下油菜秸秆和水稻秸秆的最大吸附量理论值分别为14.28 mg/g和13.76 mg/g;结合SEM和FTIR分析推断,两种秸秆吸附Cd2+主要发生在吸附剂表层,吸附过程以化学吸附为主。研究表明,油菜秸秆和水稻秸秆是具有潜在利用价值的Cd2+吸附剂。

关键词(KeyWords)： 环境工程学;水稻秸秆;油菜秸秆;镉;吸附特性

Abstract:

Keywords:

基金项目(Foundation): 国家水污染控制与治理科技重大专项子项目(2013ZX07103006-004);; 安徽省自然科学基金项目(1208085QD76,090415204);; 安徽农业大学稳定和引进人才科研资助项目(Wd2013-3)

作者(Authors): 黄界颍;胡宏祥;伍震威;徐晓春;丁小龙;

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