生物炭—壳聚糖制备凝胶颗粒对水中四环素的高效去除

Adsorption Behavior of Chlortetracycline on the Biochar-Based Magnetic Gel Balloon

以污泥生物炭和壳聚糖制备凝胶颗粒并在其上负载磁性Fe_(3)O_(4)颗粒,得到磁性含生物炭的凝胶SCB,可以实现对水中四环素(TC)的高效去除。实验结果表明,SCB对TC具有优异的吸附性能,在25℃时其吸附量可达184.31mg/g,明显好于污泥生物炭的吸附性能,并借助FTIR、XPS等表征手段分析了SCB分别对TC的吸附机理,主要归因于空间填充、静电吸引、氢键结合、离子交换以及络合作用;吸附TC的过程遵循准二级动力学和Langmuir模型,表明该过程以物理化学综合吸附为主,TC在生物炭和SCB上的吸附是一个吸热过程,升高温度有利于TC吸附。本研究可望为高浓度TC废水的吸附处理提供方法参考,并为污泥的无害化处理提供一种有效方法。

Using sludge-based biochar and chitosan as the precursor to prepare gel particles on the Fe_(3)O_(4) powder,the magnetic gel SCB containing the biochar was obtained.The SCB achieve efficient removal of tetracycline(TC)in water.The experimental results showed that the SCB has excellent adsorption capacity for TC.Its adsorption capacity can reach 184.31 mg/g at 25℃,significantly better than sludge biochar.The adsorption mechanism of the SCB for TC was analyzed by FTIR,XPS,and other characterization methods.The adsorption mechanism was mainly due to the space filling,electrostatic attraction,hydrogen bond binding,ion exchange,and complexation.The process of TC adsorption follows pseudo second-order kinetics and the Langmuir model,indicating that the process was dominated by physical and chemical comprehensive adsorption.The adsorption of TC on biochar and SCB was an endothermic process,and the increased temperature was conducive to the adsorption of TC.This study provided a reference for the adsorption treatment of the high TC concentration and the sludge's harmless treatment.