Gupta Vinod Kumar, Agarwal Shilpi, Ahmad Rais, Mirza Anam, Mittal Jyoti
Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
Int J Biol Macromol. 2020 May 7. doi: 10.1016/j.ijbiomac.2020.05.025.
In the present study, a potential Guar gum/activated carbon nanocomposite as an adsorbent was synthesized and utilized for the sequestration of toxic congo red dye from synthetic wastewater. The nanocomposite was characterized using different techniques such as SEM, EDX, TEM, FTIR and XRD. Various physico-chemical parameters such as influence of contact time, pH, adsorbent dose, temperature and initial dye concentration were investigated to optimize conditions for maximum adsorption of congo red. Equilibrium data fitted well with Langmuir isotherm model having maximum adsorption capacity of 831.82 mgg at 313 K. The kinetic studies demonstrated that the adsorption followed a pseudo-second order kinetic model. The thermodynamic study showed that the adsorption of congo red onto nanocomposite was spontaneous, exothermic with decreased in randomness at solid/liquid interface. The regeneration study indicated that the nanocomposite could be reused successfully upto five consecutive cycles. Therefore, the present material can be effectively and efficiently urilized for the removal of congo red dye from aqueous solution as well as industrial wastewater.
在本研究中，合成了一种潜在的瓜尔胶/活性炭纳米复合材料作为吸附剂，并用于从合成废水中螯合有毒的刚果红染料。使用扫描电子显微镜（SEM）、能量散射X射线光谱（EDX）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）等不同技术对该纳米复合材料进行了表征。研究了各种物理化学参数，如接触时间、pH值、吸附剂剂量、温度和初始染料浓度的影响，以优化刚果红最大吸附的条件。平衡数据与朗缪尔等温线模型拟合良好，在313K时最大吸附容量为831.82mg/g。动力学研究表明，吸附遵循准二级动力学模型。热力学研究表明，刚果红在纳米复合材料上的吸附是自发的、放热的，且固/液界面处的随机性降低。再生研究表明，该纳米复合材料可以成功重复使用多达五个连续循环。因此，本材料可有效且高效地用于从水溶液以及工业废水中去除刚果红染料。
