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(qiáng)吸附劑對磷酸根的吸附.當(dāng)Zn∶Al∶La摩爾比為2.00∶0.90∶0.10時(shí),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(shí)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(fù)合金屬氧化物,同時(shí)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(shí)表現(xiàn)出較強(qiáng)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(xué);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(xué)市政環(huán)境工程學(xué)院,黑龍江,哈爾濱,150090北京林業(yè)大學(xué)環(huán)境科學(xué)與工程學(xué)院,北京,100083 期 刊： 化工學(xué)報(bào)   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(jī)標(biāo)分類號： TQ4 O6 機(jī)標(biāo)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(fù)合金屬氧化物    吸附劑    molar ratio    mixed metal    吸附動力學(xué)    吸附性能    吸附等溫 基金項(xiàng)目： 國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)

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