Kong Lingzhen, Liang Xingtang, Zhan Yanjun, Jiao Shufei, Zhen Yunying, Liu Min, Tan Jisuan, Yin Yanzhen
Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, Beibu Gulf University, Qinzhou 515000, China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 515000, China.
Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, Beibu Gulf University, Qinzhou 515000, China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 515000, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127458. doi: 10.1016/j.ijbiomac.2023.127458. Epub 2023 Oct 14.
In this study, an amine-rich gel (ARAS) was prepared by chemically altering Acacia senegal (AS). ARAS acts as an adsorbent for selenium. Owing to the introduction of amino functional groups and a remarkable specific surface area (91.89 g/m), ARAS shows maximum adsorption capacities at 75 and 130 mg g for Se(IV) and Se(VI), respectively. The removal efficiency of ARAS is higher (ω = 98.2 % and ω = 98.6 %) at lower concentrations (C = 100 ppm and C = 95 ppm) and the adsorption equilibrium is achieved within 60 min. The adsorption process of Se (IV) and Se (VI) via ARAS is elucidated using the Quasi-Second-Order kinetic and Langmuir models. The enhanced adsorption capacity of the adsorbent could be attributed to the synergistic effects of electrostatic attraction, hydrogen bonding, and specific physicochemical properties. Thermodynamic studies reveal that the surface adsorption process is spontaneous and exothermic. Notably, ARAS maintains remarkable adsorption stability under a variety of solution conditions, including variable pH (4-11), NaCl concentrations (0-1 M), and the presence of organic solvents. It retains approximately 60 % of its initial adsorption capacity for Se(IV) and Se(VI) after three adsorption cycles. Therefore, ARAS with its cost-effectiveness and exceptional performance shows considerable potential for applications in water treatment.
在本研究中，通过对阿拉伯胶（AS）进行化学改性制备了一种富含胺的凝胶（ARAS）。ARAS作为硒的吸附剂。由于引入了氨基官能团和显著的比表面积（91.89 g/m），ARAS对Se(IV)和Se(VI)的最大吸附容量分别为75和130 mg/g。在较低浓度（C = 100 ppm和C = 95 ppm）下，ARAS的去除效率更高（ω = 98.2%和ω = 98.6%），且在60分钟内达到吸附平衡。使用准二级动力学和朗缪尔模型阐明了ARAS对Se(IV)和Se(VI)的吸附过程。吸附剂吸附容量的提高可归因于静电吸引、氢键和特定物理化学性质的协同作用。热力学研究表明，表面吸附过程是自发的且放热的。值得注意的是，ARAS在各种溶液条件下都保持着显著的吸附稳定性，包括不同的pH值（4 - 11）、NaCl浓度（0 - 1 M）以及有机溶剂的存在。经过三次吸附循环后，它对Se(IV)和Se(VI)仍保留约60%的初始吸附容量。因此，具有成本效益和卓越性能的ARAS在水处理应用中显示出巨大的潜力。
