Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide
Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide
复制标题
利用明矾渣生产氢氧化铝和层状双氢氧化物
DOI：
10.1016/j.ceramint.2014.07.012
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发表时间：
2014-12
影响因子：
5.2
通讯作者：
ZHOU Chun Hui
中科院分区：
文献类型：
--
作者：
WANG Ling Yun;TONG Dong Shen;ZHAO Li Zhi;LIU Feng Guo;AN Ning;YU Wei Hua;ZHOU Chun Hui
研究了以矾渣为铝源，制备氢氧化铝（Al（OH）3）和层状双氢氧化物（LDH）的工艺。考察了酸处理、碳酸氢钠中和和CO2中和对Al（OH）3产物的影响。采用X射线粉末衍射、傅里叶变换红外光谱、热分析、扫描电镜、X射线能谱和N2吸附-脱附等方法对Al（OH）3样品进行了表征。当10 g明矾渣与15 ml 16 mol/L硫酸在170 °C下反应1 h，分离Fe（OH）3和Al（OH）3时，Al（OH）3的产率最高可达87.23%。在不同的萃取和沉淀条件下，Al（OH）3产物以勃姆石和三羟铝石或它们的混合物的形式存在。不同的中和度影响Al（OH）3产物的纯度、产率、形貌和织构。用CO2气体中和得到非晶态Al（OH）3，用NaHCO 3水溶液中和得到纤维状结晶Al（OH）3。通过添加外部镁源，可以通过共沉淀和水热法将所得Al（OH）3转化为结晶层状双氢氧化物（LDH）。结果表明，晶态和非晶态Al（OH）3均能发生分解，并与Mg物种重新组装形成晶态LDH。
The present work dealt with the utilization of alum sludge, which acted as an aluminum source, for producing aluminum hydroxide (Al(OH)3) and layered double hydroxide (LDH). The effects of the acid treatment and the neutralization with an aqueous sodium bicarbonate (NaHCO3) solution or with CO2gas on the Al(OH)3products were investigated. The Al(OH)3samples were characterized by powder X-ray diffraction, Fourier transform-infrared spectroscopy, thermal analysis, scanning electron microscopy, X-ray energy dispersive spectroscopy and N2adsorption–desorption. A maximum 87.23% yield of Al(OH)3was achieved under conditions as follows: the treatment of 10 g of alum sludge with 15 ml of sulfuric acid (16 mol/L) at 170 °C for 1 h, followed by the separation of Fe(OH)3and Al(OH)3. Depending upon the conditions of extraction and precipitation, the Al(OH)3products appeared to be in the form of boehmite and bayerite or their mixture. Varying neutralization influenced the purity, yield, morphology, and texture of the Al(OH)3products. Amorphous Al(OH)3was obtained by using CO2gas for the neutralization, whereas fiber-like crystalline Al(OH)3was obtained by using an aqueous NaHCO3solution for the neutralization. With addition of an external magnesium source, the resultant Al(OH)3can then be converted into crystalline layered double hydroxide (LDH) by a coprecipitation and hydrothermal method. The results indicated that crystalline and amorphous Al(OH)3can both undergo decomposition and subsequent reassembly with Mg species to form crystalline LDH.
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影响因子：
5.6
作者：
C. Zhou
通讯作者：
C. Zhou
DOI：
10.1016/s0965-9773(97)00201-8
发表时间：
1997-08
期刊：
Nanostructured Materials
影响因子：
--
作者：
C. Shek;J. Lai;T. Gu;G. M. Lin
通讯作者：
C. Shek;J. Lai;T. Gu;G. M. Lin
DOI：
10.2166/wst.2009.609
发表时间：
2009-12
期刊：
Water science and technology : a journal of the International Association on Water Pollution Research
影响因子：
--
作者：
Y. Yang;Y. Q. Zhao;A. Babatunde;P. Kearney
通讯作者：
Y. Yang;Y. Q. Zhao;A. Babatunde;P. Kearney
影响因子：
8.6
作者：
Huaiyong Zhu;J. Riches;J. Barry
通讯作者：
Huaiyong Zhu;J. Riches;J. Barry
影响因子：
4.2
作者：
Antonyraj, Churchil A.;Gandhi, Mohini;Kannan, S.
通讯作者：
Kannan, S.