吸附
吸附剂
吉布斯自由能
化学
焓
朗缪尔吸附模型
傅里叶变换红外光谱
吸热过程
解吸
朗缪尔
核化学
分析化学(期刊)
材料科学
吸附
化学工程
物理化学
色谱法
热力学
物理
工程类
作者
Hamza Shehzad,Zahoor H. Farooqi,Ejaz Ahmed,Ahsan Sharif,Muhammad Imran Din,Muhammad Arshad,Jan Nisar,Limin Zhou,Yun Wang,Imran Nawaz,Maroosh Hadayat,Kibrya Shahid
标识
DOI:10.1016/j.ijbiomac.2020.02.259
摘要
A novel hybrid biocomposite based on amino-thiocarbamate derivative of alginate, carboxymethyl chitosan and TiO2 (TiO2/TSC-CMC) was fabricated and characterized using Fourier transform Infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX). The TiO2/TSC-CMC mass ratio (5.0–30.0%) was optimized and 3TiO2/TSC-CMC (hydrogel beads with TiO2/TSC-CMC mass ratio of 20.0%) was selected as the best sorbent for effective biosorption of Ni(II). Batch sorption experiments were conducted, instantaneous and equilibrium sorption capacities were investigated as function of pH, sorbent dose, initial metal concentration, contact time and temperature. Kinetic data could be well explained through pseudo second order rate equation (PSORE) depicting that the rate determining step involves the transfer of electron density from sorbent functional sites to central metal ion. Langmuir model fitted well with isothermal sorption data and maximum monolayer sorption capacity (qm) was computed as 172 mg/g at pH 6.0 and temperature 298 K. The values of thermodynamic parameters such as standard enthalpy change (16.94 kJ/mol) and standard Gibbs energy change (−18.67, −19.48, −20.57, and −21.38 kJ/mol) and standard entropy change (0.12 kJ/mol·K) concluded that sorption process is endothermic, spontaneous and resulted with increase in randomness. Hence, 3TiO2/TSC-CMC was found efficient and reusable sorbent.
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