摘要
为了开发一种新型除磷吸附剂,将二价金属离子(Mg2+、Zn2+、Cu2+、Ni2+、Co2+)和三价金属离子(Al3+、Fe3+)分别组合,用共沉淀法制备了不同金属组成的类水滑石,研究了类水滑石及其焙烧产物的磷吸附效果。结果表明:Zn/Al摩尔投料比为2∶1的类水滑石300℃焙烧4 h,得到的吸附剂对城市污水处理厂污泥脱水液中磷的吸附容量最高,约40.77 mg/g;在pH中性和弱碱性条件下,Zn-Al-2-300对水中磷的吸附效果较好,吸附动力学符合假二级动力学方程,吸附等温线符合Langmuir吸附等温式;5%NaOH+10%Na2CO3溶液对载磷类水滑石的磷解吸效果最好,其解吸率约为91.17%。
A series of hydrotalcite-like compounds（HTALs） were made by coprecipitation with divalent ions（Mg^2＋,Zn^2＋,Cu^2＋,Ni^2＋ and Co^2＋） and trivalent ions（Al^3＋ and Fe^3＋）in order to be applied in phosphate adsorption as a new sorbent.With Zn-Al molar ratio of 2∶1 and calcinations treatment at 300℃ for 4 hrs,Zn-Al HTALs showed the most effective capacity as adsorbent to uptake phosphate up to 40.77 mg/g in sewage sludge filtrate with initial concentration of around 20.0 mg/L.Under neutral or weak base condition,Zn-Al-2-300 indicated higher stability and capacity of phosphate adsorption.The adsorption kinetics followed pseudo second-order equation quite accurately and the isotherm was suggested as Langmuir-type.In addition,the highest desorption rate of 91.17% for phosphate from used HTALs was achieved when using 5% NaOH＋10%Na2CO3 as the desorption solution.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2009年第2期128-132,共5页
Journal of Beijing Forestry University
基金
"973"国家重点基础研究发展计划项目(2004CB418505)
黑龙江省杰出青年基金项目(2005)
关键词
类水滑石
磷吸附
污泥脱水液
解吸
HTALs
phosphate adsorption
sewage sludge filtrate
desorption
