摘要
活性炭吸附法是重金属废水处理的重要方法。利用廉价的稻壳,选择氢氧化钠和磷酸作活化剂制备活性炭,测定了稻壳基活性炭的比表面积、亚甲基蓝吸附值、碘吸附值、苯酚吸附值和等电点。利用制备的稻壳基活性炭吸附溶液中的Cd、Cu、Zn,研究了不同稻壳基活性炭对Cd、Cu、Zn的吸附差异,并利用X射线衍射仪分析了稻壳基活性炭中微晶体结构。结果表明,氢氧化钠作活化剂时,浸渍方式不影响稻壳基活性炭品质,2种活化方式(即氢氧化钠颗粒直接混合后烧制和氢氧化钠浸渍后烧制)所制备的稻壳基活性炭达到或接近木质净水用活性炭一级品标准,对Cd、Cu、Zn吸附量基本表现为Cu>Cd>Zn;磷酸作活化剂时,制备的稻壳基活性炭受稻壳粉碎粒径影响显著,粒径越小,越不利于对重金属的吸附,这与活性炭的等电点和含硅量有关。
Series of rice husk based active carbon（AC） was prepared by chemical activation with NaOH and H3PO4 as activator.These obtained ACs were applied for adsorption of heavy metals in solution,their difference in adsorption of Cd,Cu and Zn were compared.The specific surface area,methylene blue adsorption value,iodine adsorption value,phenol adsorption value and pHpzc of the prepared ACs were determined,and the crystal structure of ACs was also analyzed by an X-ray diffraction.Results showed when NaOH was used as activator,the activation method had little effect on the quality of rice husk-based ACs,they all achieved excellent adsorption performance,their adsorption capacity for heavy metals followed the order of CuCdZn.Particle size had significant effect on adsorption capacity of H3PO4 activated ACs,smaller particle size result in low heavy metal adsorption capacity.This was related to the isoelectric point and the silicon content of the ACs.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2011年第1期41-45,51,共6页
Environmental Pollution & Control
基金
南京农业大学高层次引进人才科研基金资助项目(No.804082)
关键词
稻壳
活性炭
化学活化
重金属
吸附
rice husk
activated carbon
chemical activation
heavy metal
adsorption
