Ahmad Waqas, Qaiser Shanif, Ullah Rahman, Mohamed Jan Badrul, Karakassides Michael A, Salmas Constantinos E, Kenanakis George, Ikram Rabia
Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Pakistan.
Department of Chemical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Materials (Basel). 2020 Dec 23;14(1):34. doi: 10.3390/ma14010034.
The present study focuses on fabrication of magnetic activated carbon (M-AC) using tire waste and its potential investigation for adsorption of Cr (VI) from wastewater. The composite material (M-AC) was synthesized by pyrolysis followed by in situ magnetization method, and characterized by FTIR, FESEM, EDX, and XRD analysis. The maximum adsorption of Cr (VI) ion over composite adsorbent was found (99.5%) to occur at pH 2, sample volume 10 mL, adsorbent dose 100 mg, contact time 30 min. The adsorption process was endothermic, feasible, spontaneous, and was found to follow pseudo second order of the reaction. The Cr ion could be completely desorbed (99.3%) from the composite adsorbent by using 20 mL of 2 M NaOH solution. The composite adsorbent was regenerated by continuous adsorption and desorption for 5 consecutive cycles by using 10 mL 0.1 M HCl solution. M-AC also performed well in case of tannery wastewater by removing about 97% of Cr (VI).
本研究聚焦于利用废旧轮胎制备磁性活性炭（M-AC）及其对废水中Cr（VI）吸附潜力的研究。采用热解后原位磁化法合成复合材料（M-AC），并通过傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜（FESEM）、能谱分析（EDX）和X射线衍射（XRD）分析对其进行表征。发现复合吸附剂对Cr（VI）离子的最大吸附量（约99.5%）出现在pH值为2、样品体积为10 mL、吸附剂剂量为100 mg、接触时间为30 min时。吸附过程是吸热的、可行的、自发的，且遵循准二级反应。通过使用20 mL 2 M的氢氧化钠溶液，Cr离子可从复合吸附剂上完全解吸（约99.3%）。通过使用10 mL 0.1 M的盐酸溶液连续进行5个循环的吸附和解吸，复合吸附剂得以再生。在制革废水处理中，M-AC也表现良好，能去除约97%的Cr（VI）。
