LDH的制备及其对水环境中低含量磷的吸附研究  

PREPARATION OF LDH AND THEIR ADSORPTIVE REMOVAL CAPACITY OF LOW CONCENTRATION OF PHOSPHORUS IONS IN WATER ENVIRONMENT

作　　者：李琦[1] 付格娟 李剑超[3] 

机构地区：[1]长安大学,710054 [2]西安市环境监测站,710054 [3]陕西师范大学,陕西西安710062

出　　处：《水处理技术》2013年第8期47-51,共5页Technology of Water Treatment

基　　金：国家自然科学基金(50309011);陕西省攻关计划项目(2011K17-03-06)

摘　　要：用共沉淀法制备了Mn-Fe-LDH、Mg-Mn-LDH、Ca-Fe-LDH,采用环境扫描电镜和傅立叶变换红外光谱仪对材料进行分析,研究其对水中磷酸根的吸附性能和机制。结果表明,材料孔隙结构发达,是良好的吸附材料;与吸附前的LDH相比,吸附后的3种材料红外光谱都出现了P-O振动吸收峰,从而验证了有磷酸根离子作为附加阴离子进入LDH层间;材料用量1 mL,处理质量浓度2 mg/L的40 mL磷溶液,处理时间1 h,此时Mn-Fe-LDH、Mg-Mn-LDH、Ca-Fe-LDH对磷的去除率分别达到了97.41%、82.41%和97.00%;共存离子对材料的除磷效果有不同程度的影响。Mn-Fe-LDH,Mg-Mn-LDH and Ca-Fe-LDH were synthesized by a coprecipitation method.The samples were characterized by environmental scanning electron microscopy and FT-IR to investigate the performance and mechanism of phosphate adsorption.The results show that The LDHs can be well used as adsorptive materials for developed pore structure;Compare to LDH before adsorption,after adsorption,the materials appear the P-O vibration absorption peak,indicate that inorganic phosphate as additional anion into the LDH interlayer;Mn-Fe-LDH,Mg-Mn-LDH,Ca-Fe-LDH on phosphorus removal rate can reach 97.41%,82.41% and 97.00% on conditions of material amount 1 mL,40 mL phosphorus solution of 2 mg/L,processing time 1 h;Coexisting ions have effect on phosphorus removal at different levels.

关 键 词：层状双金属复合氢氧化物（LDH） 低含量 磷 吸附 

分 类 号：TQ424[化学工程]