Chemical Engineering Area, Central Leather Research Institute, Council of Scientific & Industrial Research, Adyar, Chennai, India.
Environ Sci Pollut Res Int. 2012 Jun;19(5):1687-95. doi: 10.1007/s11356-011-0666-2. Epub 2011 Dec 9.
Biosorption is an emerging, eco-friendly and economical method for treating the wastewater effluents. Compared to many other biological materials, algae biomass proved to be the better biosorbent due to the presence of cell wall polymers in them.
Algal biomasses namely Enteromorpha flexuosa and Gracilaria corticata were dried, crushed and used as biosorbents. Ponceau S, a diazo dye was used as a model adsorbate for the biosorption studies. The biosorbents were characterized by Scanning Electron Microscopy, FT-IR and zero point charge. Batch studies were performed by varying pH, biosorbent dosage and initial dye concentrations. Adsorption isotherms, kinetic and thermodynamic analyses were carried out. The effect of electrolytes was also studied. Batch desorption studies were also carried out using various reagents.
Isotherm data were tested with Langmuir and Freundlich isotherm models and the results suggested that the Freundlich isotherm fitted the data well. Kinetic studies were performed with varying initial dye concentrations and the data were incorporated with pseudo first-order and pseudo second-order kinetic equations and was found that the studied biosorption processes followed pseudo second-order kinetic equation. Thermodynamic parameters were evaluated at three different temperatures 293 K, 300 K and 313 K. About 95% of the dye could be desorbed from both the biosorbents.
Both the algal biomasses had heterogeneous surfaces and followed pseudo second-order chemical kinetics. Thermodynamic parameters proved that the biosorption by both the biomasses were spontaneous, feasible and endothermic processes. Desorption studies proved the worth of the algal biomasses as biosorbents in industrial level.
生物吸附是一种新兴的、环保且经济的方法，可用于处理废水。与许多其他生物材料相比，藻类生物质由于其细胞壁聚合物的存在，被证明是更好的生物吸附剂。
将藻类生物质（即皱波角叉菜和石莼）干燥、粉碎并用作生物吸附剂。使用酸性红 27（一种偶氮染料）作为模型吸附物进行生物吸附研究。通过扫描电子显微镜、傅里叶变换红外光谱和零电荷点对生物吸附剂进行了表征。通过改变 pH 值、生物吸附剂用量和初始染料浓度进行批量研究。进行了吸附等温线、动力学和热力学分析。还研究了电解质的影响。使用各种试剂进行了批量解吸研究。
等温线数据用朗缪尔和弗雷德里希等温线模型进行了测试，结果表明，弗雷德里希等温线更适合拟合数据。动力学研究是在不同的初始染料浓度下进行的，数据与伪一阶和伪二阶动力学方程相结合，结果表明，所研究的生物吸附过程遵循伪二阶动力学方程。在三个不同的温度 293 K、300 K 和 313 K 下评估了热力学参数。大约 95%的染料可以从两种生物吸附剂中解吸。
两种藻类生物质都具有不均匀的表面，遵循伪二阶化学动力学。热力学参数证明，两种生物质的吸附都是自发、可行和吸热的过程。解吸研究证明了藻类生物质作为生物吸附剂在工业水平上的价值。
