秸秆生物质炭吸附溶液中Cu^(2+)的影响因素研究  

Influencing Factors of Cu^(2+) Sorption to Straw-derived Biochar

作　　者：贾明云[1] 王芳[1] 卞永荣[1] 杨兴伦[1] 谷成刚[1] 宋洋[1] 蒋新[1] 

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

出　　处：《土壤》2014年第3期489-497,共9页Soils

基　　金：国家自然科学基金项目(41030531;41271464);农业部公益性行业专项(201203045);中国科学院知识创新工程青年人才类重要方向项目(KZCX2-EW-QN403)资助

摘　　要：生物质炭在吸附土壤中重金属和有机污染物方面发挥着重要作用,然而关于生物质炭吸附重金属的影响因素研究较少。以小麦和玉米秸秆为原料制备生物质炭,分析了生物质炭和溶液性质对水溶液中Cu2+吸附的影响。结果表明生物质炭可有效吸附Cu2+,且不易解吸。Cu2+吸附量随pH和Cu2+初始浓度的升高而增加;高温炭对Cu2+的吸附随离子强度增强而增大;柠檬酸抑制低温炭对Cu2+的吸附,而腐植酸促进Cu2+吸附;生物质炭灰分对Cu2+吸附无显著影响。Biochar plays important roles in the retention of heavy metals and organic contaminants in soil. However, little attention has been paid to the factors that affect the sorption of heavy metals to biochar. Environmental factors influencing on the sorption of copper to wheat and maize-straw-derived biochars pyrolysis at different temperatures were analyzed in aqueous solution. The results showed that, biochar was an effective sorbent to retain Cu2＋, and the retained Cu2＋ was not easy to be desorbed. The amount of Cu2＋ adsorbed increased as the increasing of pH and initial concentration of Cu2＋ in solution. As the solution ionic strength increase, sorption amount of Cu2＋ to high temperature produced biochar increased. Small molecular organic ligand like citric acid suppressed the sorption, but humic acid slightly enhanced the sorption of Cu2＋ to low temperature produced biochar. However, the ash content of biochar has no significant effect on the sorption of Cu2＋.

关 键 词：热解 络合作用 沉淀作用 离子交换 

分 类 号：X53[环境科学与工程—环境工程]