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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(jié)構(gòu)特征和對磷酸根的吸附性能.結(jié)果表明,在保持類水滑石層狀結(jié)構(gòu)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(nèi)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(zhuǎn)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(guān)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(guān)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(shù)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(guān)文章：
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