摘要
为探讨低分子量有机酸对黑碳吸附重金属离子的影响,由玉米秸秆燃烧物提取黑碳,用平衡吸附技术研究了有机酸对黑碳吸附铅(Pb2+)和镉(Cd2+)的影响。结果表明:柠檬酸和酒石酸在浓度低于10 mmol.L-1时能促进黑碳对Pb2+的吸附,且柠檬酸的促进作用强于酒石酸;草酸和水杨酸则抑制黑碳对Pb2+的吸附,草酸的抑制作用强于水杨酸;柠檬酸、酒石酸和草酸在浓度低于400 mmol.L-1时能促进黑碳对Cd2+的吸附,促进作用为柠檬酸>酒石酸>草酸;浓度低于4 mmol.L-1的水杨酸也能促进黑碳对Cd2+的吸附;当有机酸促进Pb2+和Cd2+吸附时,随有机酸浓度的提高,Pb2+和Cd2+的吸附量先升高后下降,且有机酸对黑碳吸附重金属离子的影响随有机酸和重金属离子的特性而异。
To study the effect of low molecular weight organic carboxylic acids on the adsorption of heavy metal ions on black carbon, the adsorption of Pb^2＋ and Cd^2＋ on black carbon with the four organic acids was investigated using the equilibrium sorption technique. The results showed that citric and tartaric acids （〈10 mmol·L^-1） significantly enhanced the adsorption of Pb^2＋, the enhancement of citric acid was stronger than that of tartaric acid; while, salicylic and oxalic acids could restrain the adsorption of Pb^2＋, the restraint of oxalic acid was stronger than that of salicylic acid. Citric, tartaric and oxalic acids （〈400 mmol ·L^-1） could significantly enhance the adsorption of Cd^2＋, the enhancement of the citric acid was the strongest, the tartaric acid was second and the oxalic acid was the least. The salicylic acid （〈4 mmol· L^-1） could significantly enhance the adsorption of Cd^2＋. The adsorption amount of Pb^2＋ and Cd^2＋ on black carbon first increased and then decreased with the concentration of organic acids increasing when organic acids significantly enhanced the adsorption of Pb^2＋ and Cd^2＋ on black carbon.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2006年第5期1383-1387,共5页
Journal of Agro-Environment Science
基金
山东省自然科学基金资助项目(Y2003B04)
关键词
有机酸
黑碳
PB
CD
吸附
organic acid
black carbon
lead
cadmium
adsorption
