摘要
以木材防腐剂CCA中的重金属铬、砷和铜为研究对象,评价了氧化铝对3种重金属的同时吸附去除效果,并对3种重金属在氧化铝上相互作用机理进行了探讨。结果表明,铬对氧化铝去除砷和铜均无显著影响;砷显著抑制氧化铝对铬的去除,但促进铜的去除;铜促进氧化铝对铬和砷的去除;铬主要通过外层作用(静电吸附,离子交换等方式)吸附在氧化铝的表面上;而砷主要通过内层吸附(专性吸附)在氧化铝的表面上,因而引起氧化铝的等电点朝较低的pH移动;铜主要通过专性吸附和沉淀作用得以去除。总体上,在中性环境下,氧化铝对3种重金属可同时具有较好的去除效果。
An evaluation on adsorption removal of chromium, arsenic, and copper from wood preservative CCA by alumina, associated with interactions among three heavy metals on alumina, was studied. Results showed that chromium has no effects on removal of arsenic and copper by alumina. Arsenic significantly inhibits the removal of chromium while enhances that of copper. Copper enhances the removal of chromium and arsenic by alumina. Chromium mainly adsorbs on the surface of alumina by out-sphere adsorption （electrostatic adsorption, ion exchange, et al.）, while arsenic mainly adsorbs by forming inner-sphere complexes （specific adsorption）, resulting in the shift of isoelectric point of alumina to lower pH. Copper is removed mainly by specific adsorption and precipitation. To sum up, alumina simultaneously has higher removal efficiency to chromium, arsenic, and copper at neutral pH environment.
出处
《水处理技术》
CAS
CSCD
北大核心
2009年第12期71-74,共4页
Technology of Water Treatment
基金
上海市教委优青基金项目(gjd-07013)
关键词
氧化铝
CCA
铬
砷
铜
吸附
去除
alumina
wood preservative
CCA
chromium copper arsenic
adsorption removal
