Khan Moonis Ali, Siddiqui Masoom Raza, Otero Marta, Alshareef Shareefa Ahmed, Rafatullah Mohd
Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, 14300, Penang, Malaysia.
Polymers (Basel). 2020 Feb 24;12(2):500. doi: 10.3390/polym12020500.
Herein, commercially available Dowex 5WX8, a cation exchange polymeric resin, was modified through solvent impregnation with t-butyl phosphate (TBP) to produce a solvent impregnated resin (SIR), which was tested for the removal of rhodamine B (RhB) from water in batch adsorption experiments. The effect of SIR dosage, contact time, and pH on RhB adsorption was studied and optimized by response surface methodology (RSM), interaction, Pareto, and surface plots. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were respectively used for characterizing SIR surface morphology and identifying active binding sites before and after RhB adsorption. SEM showed that the pristine SIR surface was covered with irregular size and shape spots with some pores, while RhB saturated SIR surface was non-porous. FTIR revealed the involvement of electrostatic and π-π interactions during RhB adsorption on SIR. Dosage of SIR, contact time, and their interaction significantly affected RhB adsorption on SIR, while pH and its interaction with dosage and contact time did not. The optimum identified experimental conditions were 0.16 g of SIR dose and 27.66 min of contact time, which allowed for 98.45% color removal. Moreover, RhB adsorption equilibrium results fitted the Langmuir isotherm with a maximum monolayer capacity () of 43.47 mg/g.
在此，通过用磷酸叔丁酯（TBP）进行溶剂浸渍对市售的阳离子交换聚合物树脂Dowex 5WX8进行改性，以制备溶剂浸渍树脂（SIR），并在分批吸附实验中测试其从水中去除罗丹明B（RhB）的性能。通过响应面法（RSM）、相互作用图、帕累托图和表面图研究并优化了SIR用量、接触时间和pH对RhB吸附的影响。分别使用扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）来表征SIR的表面形态，并识别RhB吸附前后的活性结合位点。SEM显示，原始SIR表面覆盖着大小和形状不规则的斑点以及一些孔隙，而RhB饱和的SIR表面无孔。FTIR揭示了RhB吸附在SIR上过程中静电和π-π相互作用的参与。SIR用量、接触时间及其相互作用对RhB在SIR上的吸附有显著影响，而pH及其与用量和接触时间的相互作用则没有。确定的最佳实验条件为SIR剂量0.16 g和接触时间27.66分钟，可实现98.45%的脱色率。此外，RhB吸附平衡结果符合朗缪尔等温线，最大单层吸附容量（）为43.47 mg/g。
