制革污泥活性炭的特性及其在偶氮活性染料去除中的应用。
Characterization of tannery sludge activated carbon and its utilization in the removal of azo reactive dye.
机构信息
Department of Civil Engineering, SMBS, VIT University, Vellore 632 014, India.
出版信息
Environ Sci Pollut Res Int. 2012 Mar;19(3):656-65. doi: 10.1007/s11356-011-0608-z. Epub 2011 Sep 11.
INTRODUCTION
The removal of azo Reactive Red 31(RR31) from synthetic dye solution using tannery sludge-developed activated carbon (TSC) was investigated.
METHODS
TSC was prepared from a combination of physical and chemical activation. The developed TSC was characterized by FT-IR, SEM, TG-DTA, specific surface area and zero point charge of pH (pH(zpc)). The isotherm models, kinetic models and thermodynamic parameters were also analysed to describe the adsorptive behaviour of TSC. The effect of contact time, initial dye concentration, carbon dosage, agitation speed, initial pH and temperature were carried out for batch adsorption studies. The isotherm plot of the dye RR31 on TSC fitted better with the Langmuir adsorption isotherm than the Freundlich model.
RESULTS
The maximum monolayer adsorption capacity of TSC in the removal of RR31 ranged from 23.15 to 39.37 mg/g. The thermodynamic parameters showed the endothermic and physical nature of the Reactive Red 31 adsorption on TSC. The entropy and enthalpy values were 181.515 J/Kmol and 5.285 kJ/mol, respectively.
CONCLUSION
The developed cationic tannery sludge carbon was found to be an effective adsorbent in the removal of the anionic azo reactive dye RR31.
简介
本研究采用制革污泥制备的活性炭（TSC）去除合成染料溶液中的偶氮活性红 31（RR31）。
方法
TSC 是通过物理和化学联合活化制备的。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、热重-差示热分析（TG-DTA）、比表面积和零电荷点 pH 值（pH(zpc)）对所制备的 TSC 进行了表征。还分析了等温线模型、动力学模型和热力学参数，以描述 TSC 的吸附行为。进行了批处理吸附研究，考察了接触时间、初始染料浓度、碳剂量、搅拌速度、初始 pH 值和温度对吸附的影响。RR31 在 TSC 上的等温线图更符合 Langmuir 吸附等温线，而不是 Freundlich 模型。
结果
在去除 RR31 方面，TSC 的最大单层吸附容量范围为 23.15 至 39.37mg/g。热力学参数表明，RR31 在 TSC 上的吸附是吸热和物理性质的。熵和焓值分别为 181.515 J/Kmol 和 5.285 kJ/mol。
结论
开发的阳离子制革污泥碳被发现是一种有效去除阴离子偶氮活性染料 RR31 的吸附剂。
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