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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 被引量:4

Absorption of Cd^(2+) at Low Concentration by Wheat Straw and Wheat Straw Derived-biochar
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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.
出处 《灌溉排水学报》 CSCD 北大核心 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)
关键词 小麦秸秆 生物质炭 吸附 Cd2+ wheat straw absorption biochar Cd2+
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