摘要
利用废弃蛋壳为原料,水热法合成碳羟基磷灰石(CHAP)吸附剂,用它去除含铬废水中六价铬,研究了pH、六价铬初始质量浓度、吸附时间等对吸附效果的影响。结果表明:常温下,溶液pH为3、碳羟基磷灰石用量为5 g/L时,对100 mL50 mg/L的六价铬吸附速度较快,30 min基本上达到吸附平衡,去除率为98.3%,最大吸附量高达29.85 mg/g。用Langmuir和Freundlich方程拟合碳羟基磷灰石对六价铬的吸附等温式,相关系数分别为0.998 4和0.922 6,说明这两个方程都较好地描述吸附过程。通过氢氧化钠或硫酸浸泡和微波加热处理对吸附后的碳羟基磷灰石进行再生试验,再生率高达94.3%和94.8%。
Carbonate hydroxylapatite （CHAP） sorbent has been synthesized by hydrothermal method with abandoned eggshell as raw material, which was used to eliminate hexavalent chrome in wastewater. Factors, such as pH, adsorption time, and initial concentration of hexavalent chrome in wastewater that might influence the adsorption performance, were investigated. Results showed that the removal rate of hexavalent chrome by CHAP sorbent was increased to 98.3% and the maximum adsorption capacity was up to 29.85 mg/g when pH was 3.0, adsorption time was 30 min, dosage of CHAP was 5 g/L and the initial concentration of hexavalent chrome in wastewater was 100 mL 50 mg/L at room temperature. Basically, it was 30 min to reach adsorption equilibrium. The adsorption isotherms for hexavalent chrome could be well fitted by both Langmuir and Freundlich equations,which could be used to describe the adsorption behavior. Their correlation coefficients were 0. 998 4 and 0. 922 6, respectively. After adsorption, CAHP could be regenerated quantificationally with NaOH or H2SO4 and regeneration ratio could reach 94.3% and 94.8% respectively under microwave heating.
出处
《无机盐工业》
CAS
北大核心
2009年第1期44-47,共4页
Inorganic Chemicals Industry
基金
国家高技术研究发展计划(863)项目(2004AA649370)
国家杰出青年科学基金项目(50425927,50225926)
湖南省自然科学基金项目(07JJ6013)
关键词
碳羟基磷灰石
吸附
六价铬
carbonate hydroxyapatite
adsorption
hexavalent chrome
