Dovi Evans, Aryee Aaron Albert, Liu Mingyu, Zhang Xiaoting, Kani Alexander Nti, Li Jianjun, Han Runping, Qu Lingbo
College of Chemistry, Green Catalysis Center, Zhengzhou University, No 100 of Kexue Road, Zhengzhou, 450001, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Dec;29(60):90530-90548. doi: 10.1007/s11356-022-22081-1. Epub 2022 Jul 23.
Recent progress has been made in the application of novel zirconium-loaded amine-grafted walnut shells as multifunctional adsorbents for the remediation of Alizarin red (AR) and bacteria in aqueous solutions. The morphology and functional groups of ACWNS@Zr were studied using Brunauer-Emmett-Teller (BET) techniques, X-ray diffraction (XRD), pH point of zero charges (pHpzc), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. Adsorption and regeneration tests were carried out in batch and column mode. The ACWNS@Zr had a Langmuir maximum capacity of 415.5 ± 6.1 mg g at 303 K. The spread plate technique was used to evaluate the adsorbent's antimicrobial properties against Staphylococcus aureus and Escherichia coli. ACWNS@Zr exhibited inhibitory potential towards S. aureus and E. coli in the suspensions by 53.3% and 15.0%, respectively. Electrostatic interaction and complexation interaction could be the key mechanisms governing AR dye removal. Equilibrium isotherms fit Langmuir models better for both batch and column studies, while adsorption kinetics to pseudo-second-order and Thomas models for batch and column studies, respectively. Thermodynamic studies indicated that the adsorption process was endothermic and spontaneous. Furthermore, columns' mass transfer capacity (B) increased as the concentration increased due to the enhanced driving force for AR adsorption onto ACWNS@Zr. Regeneration with NaOH solution of AR-loaded ACWNS@Zr was remarkable.
新型负载锆的胺接枝核桃壳作为多功能吸附剂用于修复水溶液中的茜素红（AR）和细菌，近来已取得进展。采用布鲁诺尔-埃米特-泰勒（BET）技术、X射线衍射（XRD）、零电荷点pH值（pHpzc）、扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）光谱对ACWNS@Zr的形态和官能团进行了研究。以分批和柱模式进行了吸附和再生试验。在303K时，ACWNS@Zr的朗缪尔最大吸附量为415.5±6.1mg/g。采用平板涂布技术评估吸附剂对金黄色葡萄球菌和大肠杆菌的抗菌性能。ACWNS@Zr对悬浮液中的金黄色葡萄球菌和大肠杆菌的抑制潜力分别为53.3%和15.0%。静电相互作用和络合相互作用可能是控制AR染料去除的关键机制。对于分批和柱研究，平衡等温线都更符合朗缪尔模型，而对于分批和柱研究，吸附动力学分别符合拟二级和托马斯模型。热力学研究表明吸附过程是吸热且自发的。此外，由于AR吸附到ACWNS@Zr上的驱动力增强，随着浓度增加，柱的传质容量（B）增大。用氢氧化钠溶液对负载AR的ACWNS@Zr进行再生效果显著。
