Fathy Mahmoud, Selim Hanaa, Shahawy Abeer E L
Department of Petroleum Application, Core Lab Analysis Center, Egyptian Petroleum Research Institute Cairo Nasr City P.B. 11727 Egypt
Department of Analysis and Evaluation, Central Lab, Egyptian Petroleum Research Institute Cairo Nasr City P.B. 11727 Egypt
RSC Adv. 2020 Jun 19;10(39):23417-23430. doi: 10.1039/d0ra02960b. eCollection 2020 Jun 16.
A new hybrid mesoporous nanocomposite (CMCM-48) based on chitosan and silica MCM-48 was considered as a potential adsorbent for removing phenol from aqueous solutions (toxic liquid waste) in a batch process. The new composite adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and nitrogen adsorption-desorption isotherms. The adsorption isotherm studies were analyzed using linear and nonlinear Langmuir, Freundlich and Dubinin-Radushkevich models for the optimum conditions when the initial phenol concentration, pH, adsorption temperature and time were 10-500 mg L, 3-10, 25.5 °C and 300 min, respectively. It was revealed that the experimental results agree well with the Dubinin-Radushkevich model, the correlation coefficient was 0.983085. The adsorption kinetics was modeled with linear and nonlinear pseudo-first-order, pseudo-second-order and intra particle diffusion kinetic models. The pseudo-second-order model was the best for describing the adsorption process with a correlation coefficient = 0.99925. The stability of the equilibrium data was studied for a phenol sorbent with a maximum adsorption capacity of 149.25 mg g. The results verified that the synthesized CMCM-48 was an efficient adsorbent for removing phenol from aqueous solutions.
一种基于壳聚糖和二氧化硅MCM - 48的新型混合介孔纳米复合材料（CMCM - 48）被视为在间歇过程中从水溶液（有毒废液）中去除苯酚的潜在吸附剂。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT - IR）、X射线衍射（XRD）和氮吸附 - 解吸等温线对新型复合吸附剂进行了表征。在初始苯酚浓度、pH值、吸附温度和时间分别为10 - 500 mg/L、3 - 10、25.5℃和300 min的最佳条件下，使用线性和非线性朗缪尔、弗伦德利希和杜宾宁 - 拉杜舍维奇模型对吸附等温线研究进行了分析。结果表明，实验结果与杜宾宁 - 拉杜舍维奇模型吻合良好，相关系数为0.983085。用线性和非线性拟一级、拟二级和颗粒内扩散动力学模型对吸附动力学进行了建模。拟二级模型最适合描述吸附过程，相关系数R² = 0.99925。对最大吸附容量为149.25 mg/g的苯酚吸附剂的平衡数据稳定性进行了研究。结果证实，合成的CMCM - 48是从水溶液中去除苯酚的有效吸附剂。
