Al-Ghamdi Youssef O, Jabli Mahjoub, Soury Raoudha, Ali Khan Shahid
Department of Chemistry, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi Arabia.
Chemistry Department, Faculty of Science of Hail, University of Hail, Hail 81451, Saudi Arabia.
Polymers (Basel). 2020 Oct 30;12(11):2539. doi: 10.3390/polym12112539.
Cellulose substrate waste has demonstrated great potential as a biosorbent of pollutants from contaminated water. In this study, fruit, an agricultural waste biomaterial, was used for the biosorption of methylene blue from synthetic solution. Fourier-transform infrared (FTIR) spectroscopy indicated the presence of the main absorption peak characteristics of cellulose, hemicellulose, and lignin compositions. X-ray diffraction (XRD) pattern exhibited peaks at 2θ = 14.9° and 2θ = 22°, which are characteristics of cellulose . Scanning electron microscopy (SEM) showed a rough and heterogeneous surface intercepted by some cavities. Thermogravimetric analysis (TGA) showed more than a thermal decomposition point, suggesting that fruit is composed of cellulose and noncellulosic matters. The pH value of surface was experimentally determined to be 6.2. dosage, pH, contact time, dye concentration, and temperature significantly affected the adsorption capacity. The adsorption capacity reached 259 mg/g at 19 °C. The mean free energy ranged from 74.53 to 84.52 KJ mol, suggesting a chemisorption process. Thermodynamic parameters define a chemical, exothermic, and nonspontaneous mechanism. The above data suggest that fruit can be used as an excellent biomaterial for practical purification of water without the need to impart chemical functionalization on its surface.
纤维素底物废料已展现出作为受污染水中污染物生物吸附剂的巨大潜力。在本研究中，水果这种农业废弃生物材料被用于从合成溶液中生物吸附亚甲基蓝。傅里叶变换红外（FTIR）光谱表明存在纤维素、半纤维素和木质素成分的主要吸收峰特征。X射线衍射（XRD）图谱在2θ = 14.9°和2θ = 22°处出现峰，这是纤维素的特征峰。扫描电子显微镜（SEM）显示表面粗糙且不均匀，有一些孔洞。热重分析（TGA）显示有多个热分解点，表明水果由纤维素和非纤维素物质组成。通过实验测定其表面pH值为6.2。剂量、pH值、接触时间、染料浓度和温度对吸附容量有显著影响。在19°C时吸附容量达到259 mg/g。平均自由能范围为74.53至84.52 KJ/mol，表明是一个化学吸附过程。热力学参数定义了一个化学、放热且非自发的机制。上述数据表明，水果可作为一种出色的生物材料用于实际水净化，而无需对其表面进行化学功能化处理。
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