羟基磷灰石合成及吸附铅离子研究  

Synthesis of Hydroxyapatite and Application in Pb(Ii) Removal

作　　者：张浩 张思文 黄晓佩 Zhang Hao;Zhang Siwen;Huang Xiaopei(Xinyang Environmental Monitoring Station,Xinyang 464000;Xinyang Forestry Science Research Institute,Xinyang 464000;Anji Environmental Monitoring Station,Anji 313300,China)

机构地区：[1]信阳市环境监测站,河南信阳464000 [2]信阳市林业科学研究所,河南信阳464000 [3]安吉市环境保护监测站,浙江安吉313300

出　　处：《广东化工》2018年第16期93-96,共4页Guangdong Chemical Industry

摘　　要：以脐橙皮为模板、贝壳粉为原料合成羟基磷灰石(HAP)并用于去除水溶液中的Pb2+。探讨了HAP投放量、pH、反应时间、初始浓度、温度等因素对HAP吸附Pb2+的影响。结果表明,HAP的最佳用量为0.1 g,最佳pH为5.0,平衡时间2 h。等温吸附较好的符合Freundlich模型,15℃、25℃、35℃下的饱和吸附量分别为83.37 mg/g、90.06 mg/g、109.44 mg/g。吸附的机理主要是离子交换,孔内扩散是速控步骤。Hydroxyapatite（HAP） was synthesized with navel orange peel as biological template and used as adsorbent to remove Pb2＋ in solution. The extent of adsorption was studied as a function of pH, time, initial concentration, temperature. Results showed that the optimum dosage of HAP was 0.1 g and the optimal adsorption of pH was 5.0. The isotherm sorption data was better fitted with Freundlich equation. The adsorption capacity was 83.37 mg/g, 90.06 mg/g, 109.44 mg/g at 15 ℃, 25 ℃, 35 ℃, respectively. The adsorption energy（Es） calculated based on the analysis of D-R model at 15 ℃,, 25 ℃,, 35 ℃, were 17.64 k J/mol, 18.73 k J/mol, 19.74 k J/mol, which indicated the adsorption mechanism is mainly chemsorption with intra-pore diffusion as rate control step. The desorption ratio was 40.67 % when the concentration of the desorption reagent was 3 mol/L at the temperature of 60 ℃.

关 键 词：羟基磷灰石 脐橙皮 等温吸附 解吸 

分 类 号：X703.1[环境科学与工程—环境工程]