摘要
以木材防腐剂CCA中的重金属离子铬、砷、铜为研究对象,讨论了3种重金属离子在水合铁氧化物上的相互作用机理,评价了该铁氧化物对3种重金属离子的吸附去除效果,并探讨了腐殖酸对铁氧化物去除3种重金属离子的影响。结果表明,铁氧化物对单一砷和铬的去除率均随溶液pH的增加而降低,对单一铜的去除率随溶液pH增加而增加;砷和铬在铁氧化物上的吸附相互抑制;砷和铬均促进铁氧化物对铜的去除,铜也促进铁氧化物对砷和铬的去除;在腐殖酸存在下,铁氧化物对铬、砷、铜的去除效果均显著降低。竞争性吸附、协同吸附、沉淀作用、络合作用等机理被用来解释以上试验现象。
An evaluation on adsorption removal of chromium,arsenic,and copper from wood preservative CCA by hydrous ferric oxides （HFO）, associated with effects of humie acid, was studied in this paper. Results showed that removal percentage of single chromium and arsenic by/-IFO increased with pH of solutions, while that of single copper by HFO decreased. Adsorption of chromium and arsenic on HFO inhibited each other. Removal of copper by HFO was enhanced by chromium and arsenic. Copper enhanced removal of chromium and arsenic by HFO. In the presence of humie acid, removal percentage of chromium, arsenic, and copper by HFO significantly decreased compared to that in the absence ofhumic acid. Competitive adsorption, synergetic adsorption, precipitation, complexation, et al. were employed to explain the phenomena observed above.
出处
《水处理技术》
CAS
CSCD
北大核心
2009年第8期31-34,共4页
Technology of Water Treatment
基金
上海市教委优青基金项目(gjd07013)
关键词
铁氧化物
木材防腐剂
CCA
铬砷铜
去除
hydrous iron oxides
wood preservative
CCA
chromium copper arsenic
removal
