ZnAlLa類水滑石對污泥脫水液中磷酸根的吸附

摘要：通過共沉淀法合成了ZnAlLa三元類水滑石,并考察了其結構特征和對磷酸根的吸附性能.結果表明,在保持類水滑石層狀結構的條件下,La的適量摻雜可增強吸附劑對磷酸根的吸附.當Zn∶Al∶La摩爾比為2.00∶0.90∶0.10時,ZnAlLa類水滑石在24h內對污泥脫水液中磷酸根的吸附量為35.15 mg P·g~(-1),比無La時的吸附量提高了41.9%.300℃焙燒處理后,ZnAlLa樣品轉化為亞穩(wěn)態(tài)的復合金屬氧化物,同時比表面積明顯增加,其磷酸根吸附量約為焙燒前的1.48倍.ZnAlLa對磷酸根的吸附在pH變化及競爭離子存在時表現(xiàn)出較強的穩(wěn)定性.該吸附劑對污泥脫水液中磷酸根的吸附符合假二級吸附動力學;吸附等溫線表現(xiàn)為Langmuir型.Abstract：A series of ZnAlLa layered double hydroxides (LDHs) were synthesized by the coprecipitation method,and their structure and phosphate adsorption capacities were studied.The results showed that the layered structure was maintained when a proper amount of La was added as a trivalent cation into ZnAl LDHs.At the Zn∶Al∶La molar ratio of 2.00∶0.90∶0.10,the phosphate adsorption by the obtained ZnAlLa LDHs in 24 h was 35.15 mg P·g~(-1),which was 41.9% higher than that by the La-free LDHs.After calcination at 300℃,the ZnAlLa LDHs were transformed to metastable mixed metal oxides with a higher specific surface area.The phosphate adsorption by the calcined LDHs was 1.48-fold higher when compared with that by the raw material.The phosphate adsorption by the ZnAlLa showed a high stability against pH variation and competing ions in the solution.The adsorption kinetics followed a pseudo-second-order model and the isotherms were of the Langmuir type. 作者： 程翔[1]黃新瑞[1]王興祖[2]孫德智[2] Author： CHENG Xiang[1]  HUANG Xinrui[1]  WANG Xingzu[2]  SUN Dezhi[2] 作者單位： 哈爾濱工業(yè)大學市政環(huán)境工程學院,黑龍江,哈爾濱,150090北京林業(yè)大學環(huán)境科學與工程學院,北京,100083 期 刊： 化工學報   ISTICEIPKU Journal： CIESC JOURNAL 年，卷(期)： 2010, 61(4) 分類號： X703 關鍵詞： ZnAlLa類水滑石    污泥脫水液    磷酸根    吸附    Keywords： ZnAlLa layered double hydroxides    excess sludge filtrate    phosphate    adsorption    機標分類號： TQ4 O6 機標關鍵詞： 三元類水滑石    污泥脫水    磷酸根    吸附量    excess sludge    phosphate adsorption    layered double hydroxides    LDHs    coprecipitation method    adsorption kinetics    layered structure    specific surface    Langmuir型    復合金屬氧化物    吸附劑    molar ratio    mixed metal    吸附動力學    吸附性能    吸附等溫 基金項目： 國家高技術研究發(fā)展計劃(863計劃)

【ZnAlLa類水滑石對污泥脫水液中磷酸根的吸附】相關文章：

Zn-Al類水滑石吸附污泥脫水液中磷的研究04-25

磷酸銨鎂法回收污泥脫水液中磷的研究04-26

焙燒水滑石吸附脫除水中硫酸根離子的研究04-29

類水滑石材料在污染控制中的應用05-02

Mg-Al型水滑石對水溶液中F-的吸附04-25

Mg-Al型水滑石對水溶液中F-的吸附04-28

亞硝酸根離子在P(DMAEMA/HEMA)水凝膠中的吸附和擴散性能04-26

水滑石及其焙燒產物對陰離子染料酸性藍-80的吸附04-25

CPAM在污泥脫水工藝中的絮凝效果研究及應用04-29

洗毛廢水蒸餾處理塔中污泥的改性及其對污泥脫水效果的影響04-28