小麦秸秆和小麦秸秆生物质炭对低质量浓度Cd^(2+)的吸附特性研究  

Absorption of Cd^(2+) at Low Concentration by Wheat Straw and Wheat Straw Derived-biochar

作　　者：高青[1,2,3] 齐学斌[1,2] 赵志娟[1,3] 李中阳[1,2] 樊涛[1,3] 

机构地区：[1]中国农业科学院农田灌溉研究所,河南新乡453002 [2]中国农业科学院河南新乡农业水土环境野外科学观测试验站,河南新乡453002 [3]中国农业科学院农业水资源高效安全利用重点开放实验室,河南新乡453002

出　　处：《灌溉排水学报》2017年第2期12-19,共8页Journal of Irrigation and Drainage

基　　金：公益性行业(农业)科研专项经费资助项目(201203077);国家863计划项目(2012AA101404);中央级公益性科研院所基本科研业务费专项(0032015035)

摘　　要：针对再生水灌溉镉污染问题,研发新型低成本高效重金属吸附材料。以农业废弃小麦秸秆和小麦秸秆生物质炭为研究对象,研究了麦秆和小麦秸秆生物质炭对低质量浓度Cd^(2+)的吸附性能及影响因素。结果表明,麦秆和小麦秸秆生物质炭对Cd^(2+)的吸附特性符合Langmuir方程,且吸附作用主要发生在吸附开始的10 min,试验条件下,生物质炭对Cd^(2+)去除率达90%以上,麦秆对Cd^(2+)去除率为70%左右;pH值对麦秆吸附Cd^(2+)影响显著,对生物质炭吸附Cd^(2+)影响极显著,pH值为3~6时生物质炭对Cd^(2+)的吸附效果较好。温度显著影响麦秆对Cd^(2+)的吸附,温度对生物质炭吸附Cd^(2+)无显著影响,当吸附材料投加量大于0.5 g/L即固液比大于0.45 g/mg时,增大二者投加量对其吸附Cd^(2+)没有显著影响。Wheat straw and wheat straw derived-biochar were taken as the research object. Adsorption property and its influential factors of Cd2＋ at low concentration to the wheat straw and wheat straw derived-biochar in aque- ous solution were investigated. The results indicated that adsorption isotherm fit well with Langmiur equation, ad- sorption equilibrium of Cd2＋on wheat straw and wheat straw derived-biochar almost reached in 10 minutes. Under the experimental condition, the removal rate of Cd2＋ on biochar was over 90%, which was 70% on wheat straw. There was significant effect of pH values on adsorption of Cd2＋ by the biochar and wheat straw, temperature had effects on adsorption of Cd2＋ by wheat straw, but there was no significant effect of temperature on adsorption of Cd2＋ by the biochar. When 0.5 g/L wheat straw or bioehar were used, there was no effect of different dosing quan- tity on adsorption of Cd2＋ by wheat straw and its derived-biochar.

关 键 词：小麦秸秆 生物质炭 吸附 Cd2+ 

分 类 号：X703[环境科学与工程—环境工程]