碳羟基磷灰石的合成对水中Cd^(2+)的去除特性研究  

Study on the removal characteristics of Cd^(2+) from aqueous solutions by synthetic carbonated hydroxyapatite

作　　者：兰兴梅 王昌全 李冰 杨兰 李萌 徐强 董琴 LAN Xing-mei;WANG Chang-quan;LI Bing;YANG Lan;LI Meng;XU Qiang;DONG Qin(College of resources,Sichuan agricultural university,Chengdu 611130,China;Agriculture bureau of Youxian County,Mianyang 621000,China)

机构地区：[1]四川农业大学资源学院,四川成都611130 [2]绵阳市游仙区农业局,四川绵阳621000

出　　处：《化学研究与应用》2018年第4期478-484,共7页Chemical Research and Application

基　　金：国家科技支撑课题(2012BAD14B00)资助;西南地区种养业废弃物循环利用技术集成与示范项目(2012BAD14B18)

摘　　要：本文以鸡蛋壳为原料,采用凝胶-溶胶法合成碳羟基磷灰石(CHAP)并以羟基磷灰石(HAP)为对照,探讨了CHAP对水中镉(Cd^(2+))的吸附去除特性。结果表明:(1)鸡蛋壳和磷盐在75℃下反应成功合成CHAP,通过FTIR分析,合成CHAP结构具有HAP的结构特征,且掺杂了CO_3^(2-)(2)CHAP对Cd^(2+)的吸附符合Langmuir和Freundlich等温式,饱和吸附量为44.44 mg·g^(-1),高于HAP对Cd^(2+)的饱和吸附量(29.93 mg·g^(-1))48%。(3)CHAP对Cd^(2+)的吸附符合准二阶动力学方程,在60 min时吸附量达到最大值并趋于平衡。(4)当反应p H为6,温度为35℃,吸附剂用量为1.5 g·L^(-1)时,CHAP对Cd^(2+)的去除效率最佳。综上,凝胶-溶胶法合成的CHAP对水体Cd^(2+)去除效果好,成本低,可作为去除水中Cd^(2+)的低成本吸附剂,既节约资源又保护环境。In this paper,by taking eggshell as the raw material,the adsorption and removal characteristics of cadmium(Cd2+)in the water were studied by using the gel-sol method for CHAP with hydroxyapatite(HAP)as the control group.The results showed that(1)The eggshell and phosphate are successfully synthesized at 75℃,and the composite structure of CHAP carries the structural characteristics of HAP through FTIR analysis,and it mingles with CO 3 2-(2)CHAP’s absorption of Cd 2+was in accordance with Langmuir and Freundlich,and the capacity is 44.44 mg·g-1,which was higher than that of HAP on saturated adsorption capacity of Cd 2+(29.93 mg·g-1)48%.(3)The adsorption of Cd 2+of CHAP is in accordance with the quasi-second order kinetic equation,and the adsorption capacity reaches the maximum at 60 min and tends to be balanced.(4)The removal efficiency of Cd 2+was the optimum when the reaction pH was 6,the temperature 35℃and the adsorbent 1.5 g·L-1.In conclusion,CHAP synthesized through the gel-sol method is better at removing Cd 2+in the water.As it is low in cost,it can be used as a low-cost adsorbent for removing Cd 2+in water,which is both energy-conserving and environment-friendly.

关 键 词：碳羟基磷灰石 凝胶-溶胶法 Cd2+ 

分 类 号：O614.24[理学—无机化学]