中药渣生物炭对水中活性蓝19的吸附去除

Removal of Reactive Blue 19 using traditional Chinese medical residue-derived biochar

以中药渣(TCMR)为原料,采用真空热解方式制备中药渣生物炭,通过扫描电镜(SEM)、比表面积及孔径分析仪、傅里叶红外光谱(FTIR)等表征手段进行分析。中药渣生物炭的BET比表面积为808.6 m;/g,平均孔径是0.97 nm,表面有大量活性官能团。静态吸附实验结果表明,pH=7时中药渣生物炭对活性蓝19的吸附量最高;中药渣生物炭对活性蓝19的吸附过程符合准二级动力学模型(R;>0.994)和Langmuir吸附等温线(R;>0.996),最大吸附量达到85.47 mg/g。热力学分析表明该吸附过程是自发、吸热的,吸附机理可能包括孔填充、氢键与π-π共轭。采用真空热解方式制备的中药渣生物炭能够有效去除水中的活性蓝19。

The biochar was prepared from traditional Chinese medicine residue(TCMR) by vacuum pyrolysis, and analyzed by scanning electronic microscope, specific surface area and pore size analyzer, and Fourier infrared spectroscopy. The Brunauer-Emmett-Teller(BET) specific surface area of TCMR-derived biochar was 808.6 m;/g, the average pore diameter was 0.97 nm, and there were a large number of active functional groups on the surface. The results of static adsorption experiment showed that the adsorption capacity of Reactive Blue 19 by the TCMR-derived biochar was the highest when pH=7. The adsorption process accorded with the quasi second-order kinetic model(R;>0.994) and Langmuir adsorption isotherm(R;>0.996), and the maximum adsorption capacity reached 85.47 mg/g. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic, and the adsorption mechanism may include pore filling, hydrogen bond and π-π conjugation. The TCMR-derived biochar prepared by vacuum pyrolysis could effectively remove the Reactive Blue 19 from water.