摘要
以CaCl2,二乙基三胺五乙酸(DTPA)和三乙胺TEA(TEA)作为提取剂,用简化的3步连续提取法对铬渣中铬的形态进行分析,研究了活性炭的用量、活性炭的类型、浸提液pH值、吸附温度以及吸附时间对浸提液中的铬吸附的影响。结果表明,铬渣中的铬主要以可活动态和残渣态的形式存在。处理3 g铬渣,硝酸改性活性炭用量为0.3 g,在20℃,pH值为4,吸附时间为60 min时活性炭对铬的吸附效果最佳。
Speciation of Cr in Chromium slag was evaluated using a short three-step sequential extraction procedure with CaC12, DTPA and TEA as leaching agent. In addition, the effects of the amount of activated carbon, the type of activated carbon, pH values of leaching agent, the temperature and time of adsorption on the adsorption of chromium were studied. The results showed that Chromium in the chromium slag mainly exists in the form of residual and mobilized fractions. The optimal adsorption conditions are as follows： the temperature is 20 ℃, pH value is 4, the amount of nitric acid modified activated carbon is 0.3 g / 5 g chromium slag, and adsorption time is 60 minutes.
出处
《环境科技》
2013年第2期43-45,49,共4页
Environmental Science and Technology
基金
武汉科技大学国家自然科学基金预研项目(2012XG007)
国家自然科学基金项目(51204125)
关键词
铬渣
活性炭
形态分析
吸附
Chromium slag
Activated carbon
Speciation analysis
Adsorption
