新型镓基金属有机凝胶的快速室温制备及吸附四环素性能

Rapid Room-temperature Synthesis and Tetracycline Adsorption of Novel Ga-based Metal-organic Gels

采用一种快速简便的策略在室温下合成了一种镓基金属有机凝胶(Ga-TATB).Ga-TATB具有较大的比表面积、独特的分级多孔结构和优良的结构稳定性,能够有效去除水溶液中的四环素(TC).吸附过程符合拟二级动力学模型和Freundlich等温线模型,在pH=6.00,25℃条件下的最大吸附量可达149.92mg/g.考察了溶液pH、计量比、离子强度、共存的无机离子、接触时间和初始TC浓度等因素对吸附过程的影响,并结合实验结果提出了Ga-TATB吸附四环素可能的机理.值得注意的是,较强的抗干扰能力和稳定的重复利用性使得Ga-TATB在四环素类抗生素废水修复中具有良好的应用前景.

In this research,Ga-based metal-organic gels(Ga-TATB)were synthesized at room temperature through a rapid and simple strategy.Ga-TATB could effectively remove tetracycline(TC)from aqueous solution due to the large specific surface area,unique porous structure and excellent structural stability.The adsorption process of TC by Ga-TATB kept well to the pseudo-second-order kinetic model and the Freundlich isotherm model,and the maximum adsorption capacity could reach 149.92 mg/g at pH=6.00 and 25℃.Furthermore,the effect of solution pH,Ga-TATB dosage,ionic strength,coexisting inorganic ions,contact time and TC concentration on the adsorption process was systematically investigated,and the possible mechanism of Ga-TATB adsorption towards TC was proposed based on the experimental results.It is worth noting that the strong anti-interference ability and stable reusability make Ga-TATB a good application prospect in tetracycline antibiotic wastewater remediation.