| 煅烧阴离子粘土(LDO)对低浓度活性艳橙X-GN的吸附研究 |
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| 引用本文： | 张钱,吴平霄.煅烧阴离子粘土(LDO)对低浓度活性艳橙X-GN的吸附研究[J].环境科学学报,2011,31(4):770-776. |
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| 作者姓名： | 张钱 吴平霄 |
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| 作者单位： | 华南理工大学环境科学与工程学院,工业聚集区污染控制与生态修复教育部重点实验室,广州,510006 |
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| 基金项目： | 国家自然科学基金项目 (No. 41073058, 40973075, 40730741, 40573064); 教育部新世纪优秀人才支持计划 (No. NCET20620747);广东省科技计划项目 (No. 2006B36601004, 2008B30302036, 2009B050900005);广东省自然科学基金项目 (No. 06025666, 9351064101000001);中央高校基本科研业务费专项资金(No. 2009ZZ0048, 2009ZZ0073, 2009ZM0202); 高 |
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| 摘 要： | 以不同Mg/Al比(物质的量比)的合成阴离子粘土为原料,在500℃条件下煅烧制备了煅烧阴离子粘土(LDO),研究其对低浓度活性艳橙X-GN的吸附行为,并用XRD、FTIR、XRF、BET等对LDO进行表征,通过研究解吸行为验证其吸附机理.实验表明,Mg/Al比为4∶1的LDO的吸附效果比2∶1的LDO好,Mg/Al比为...
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| 关 键 词： | 阴离子粘土 煅烧阴离子粘土 活性染料 吸附机理 表征 |
| 收稿时间： | 7/21/2010 4:32:14 PM |
| 修稿时间： | 2010/8/27 0:00:00 |
Adsorption of reactive brilliant orange X-GN from aqueous solutions by layered mixed oxides |
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| ZHANG Qian and WU Pingxiao.Adsorption of reactive brilliant orange X-GN from aqueous solutions by layered mixed oxides[J].Acta Scientiae Circumstantiae,2011,31(4):770-776. |
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| Authors: | ZHANG Qian and WU Pingxiao |
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| Institution: | College of Environmental Science and Engineering, South China University of Technology, the Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006 and College of Environmental Science and Engineering, South China University of Technology, the Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006 |
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| Abstract: | Layered double hydroxides (LDH) with Mg/Al molar ratios of 2:1 and 4:1 were prepared by co-precipitation.The mixed oxides,also called calcined layered double hydroxides (LDO),were obtained by calcining the LDHat 773 Kfor 4 h.The obtained materials were characterized by powder X-ray diffraction (XRD) spectra,Fourier transform infrared (FTIR) spectra,X-ray fluorescence (XRF) spectra,and BETanalysis.Batch experiments were carried out to investigate the effects of contact time,pH,and initial dye concentration on the adsorption of reactive brilliant orange X-GNby the 2:1 LDO and 4:1 LDO.The results showed that the optimum pHvalue of the dye adsorption was 3.0.At pH3.0 and 298 K,the adsorption capacities of reactive brilliant orange X-GNby the 2:1 LDO and the 4:1 LDO were 195.66 mg·g-1 and 492.75 mg·g-1,respectively.The kinetics of the dye adsorption fit the Pseudo-second-order model.The adsorption equilibrium data were analyzed by the Langmuir,Freundlich,and Redlich-Peterson models.The Langmuir and Redlich-Peterson models provided better correlations to the equilibrium data than the Freundlich model,indicating that the mechanism of dye adsorption on the LDOwas mainly due to monolayer adsorption.XRD and FTIR analysis after dye adsorption showed that the adsorption on the 2:1 LDO was mainly due to ion exchange and the adsorption of 4:1 LDOwas mainly attributed to the structural "memory effect" of the LDO.Desorption of the reactive dye by 2:1 LDOand 4:1 LDO were also investigated,providing evidence to support the conclusions of the XRD and FTIRanalyses. |
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| Keywords: | layered double hydroxides layered mixed oxides reactive dye adsorption mechanism characterization |
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