钢渣/活性炭复合材料催化过硫酸盐降解盐酸四环素

Catalytic degradation of tetracycline hydrochloride with persulfate catalyzed by composite of carbon and steel slag

选用商用活性炭(AC)为载体,通过改变钢渣(GZ)的添加比例制备了系列GZ/AC复合材料。采用N2吸附/脱附、XRF、XRD和H_(2)-TPR等手段对制备的GZ/AC的孔结构与表面性质进行了表征,并将其用于活化过硫酸钠处理盐酸四环素废水。结果表明,活性炭在复合过程中对钢渣具有还原作用,从而提高了零价金属的含量,进而增强了其催化活性。在反应温度为65℃时,催化剂60%GZ/AC对盐酸四环素(100 mg/L)的去除率可达97%。整个降解过程是催化剂表面自由基、硫酸根自由基(SO_(4)^(·-))和羟基自由基(·OH)共同参与反应的准二级动力学过程。

Commercial activated carbon(AC)was used as carrier,series of GZ/AC composites were prepared by changing the addition ratio of steel slag(GZ). The pore structure and surface properties of GZ/AC were characterized by N2 adsorption/desorption,XRF,XRD and H_(2)-TPR. The prepared materials were used to degrade tetracycline hydrochloride(TC)wastewater by sodium persulfate activated. The results showed that the activated carbon had a reducing effect on steel slag during material preparation,thereby increased the content of zero-valence metals,and enhanced its catalytic activity. When the reaction temperature was 65 ℃,the removal rate of TC(100 mg/L)by 60%GZ/AC catalyst was 97%. The entire degradation process was a quasi-second-order kinetic process in which radicals on the catalyst surface,sulfate radicals(SO_(4)^(·-))and hydroxyl radicals(·OH)participated in the reaction.