Wen Yiping, Xie Zhengfeng, Xue Songsong, Long Jie, Shi Wei, Liu Yucheng
Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, Southwest Petroleum University, Chengdu 610500, China.
Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, Southwest Petroleum University, Chengdu 610500, China.
Int J Biol Macromol. 2023 Apr 15;234:123700. doi: 10.1016/j.ijbiomac.2023.123700. Epub 2023 Feb 16.
Herein, a novel environmentally friendly benzenesulfonyl hydrazone modified guar gum (DGH) that carries excellent adsorption performance towards dyes was facilely prepared through oxidation and condensation. The structure, morphology, and physics-chemical of DGH were fully characterized by multiple analysis techniques. The as-prepared adsorbent yielded highly efficient separating performance towards multiple anionic and cation dyes, including CR, MG, and ST with the maximum adsorption capacity of 1065.3839 ± 10.5695, 1256.4467 ± 2.9425, and 1043.8140 ± 0.9789 mg/g at 298.15 K, respectively. The adsorption process well fitted the Langmuir isotherm models and the pseudo-second-order kinetic models. The adsorption thermodynamics revealed that the adsorption of dyes onto DGH was spontaneous and endothermic. The adsorption mechanism indicated that the hydrogen bonding and electrostatic interaction participated in the fast and efficient removal of dyes. Furthermore, the removal efficiency of DGH still remained above 90 % after six adsorption-desorption cycles, and the presence of Na, Ca, and Mg have weakly impacted the removal efficiency of DGH. The phytotoxicity assay was conducted via the germination of mung bean seeds, which confirmed the adsorbent can effectivity decreased the toxicity of dyes. Overall, the modified gum-based multifunctional material has good promising applications for wastewater treatment.
在此，通过氧化和缩合简便地制备了一种对染料具有优异吸附性能的新型环保苯磺酰腙改性瓜尔胶（DGH）。采用多种分析技术对DGH的结构、形貌和物理化学性质进行了全面表征。所制备的吸附剂对多种阴离子和阳离子染料具有高效的分离性能，包括CR、MG和ST，在298.15 K时的最大吸附容量分别为1065.3839±10.5695、1256.4467±2.9425和1043.8140±0.9789 mg/g。吸附过程很好地拟合了朗缪尔等温线模型和准二级动力学模型。吸附热力学表明，染料在DGH上的吸附是自发的且吸热的。吸附机理表明，氢键和静电相互作用参与了染料的快速高效去除。此外，经过六次吸附-解吸循环后，DGH的去除效率仍保持在90%以上，Na、Ca和Mg的存在对DGH的去除效率影响较弱。通过绿豆种子发芽进行了植物毒性试验，证实该吸附剂能有效降低染料的毒性。总体而言，这种改性的基于胶的多功能材料在废水处理方面具有良好的应用前景。
