摘要
利用废弃蛋壳制备碳羟磷灰石(简称CHAP),并用作去除废水中Pb2+的吸附剂。考查了pH值、吸附时间、温度、吸附剂用量以及Pb2+初始浓度等因素对吸附效果的影响。结果表明:0.6 g/L的CHAP对750 mg/L的Pb2+的去除率高达99.9%,吸附容量达到1243.75 mg/g。CHAP对Pb2+吸附的吸附等温线均符合Freund lich和Langmu ir两种模式,从Freund lich方程中的常数1/n=0.0184可知,该吸附反应为吸热自发反应,且反应速率快。
Carbonate hydroxylapatite （ CHAP）, prepared from abandoned eggshell, was used to remove Pb^2＋ from simulated wastewater. The factors that might influent the adsorption performance of CHAP were investigated, such as pH values, adsorption time, reaction temperature, CHAP dosage and the initial concentration of Pb^2＋. The results showed that when CHAP dosage was 0.6g/L and initial concentration of Pb^2＋ was at 750 mg/L, the removal ratio of Pb^2＋ by CHAP adsorption could reach up to 99.9%, and the adsorption capacity was up to1243. 75 mg/g. The adsorption isotherms for Pb^2＋ could be well fitted by both Fretmdlich and Langmuir equation. According to the constant the 1/n = 0.0184 in the Fretmdlich equation, a conclusion could be made that the adsorption reaction was an easily spontaneous endothermic process with high reaction rote.
出处
《矿业研究与开发》
CAS
北大核心
2007年第2期35-38,50,共5页
Mining Research and Development
基金
863项目(2004AA649370)
国家杰出青年科学基金项目(50425927
50225926)
衡阳师范学院青年基金项目(2005A02)
关键词
碳羟磷灰石
PB^2+
吸附
影响因素
吸附等温线
Carbonate hydroxylapatite, Pb^2＋ , Adsorption, Influencing factor, Adsorption isotherm
