优化制备钢渣基生态活性炭及其降解甲醛性能

Optimizing Preparation and Formaldehyde Degradation Performance of Steel Slag-Based Ecological Activated Carbon

以钢渣与活性炭制备钢渣基生态活性炭。基于正交试验设计和极差分析研究助磨剂用量、活性炭用量和无水乙醇用量对钢渣基生态活性炭降解甲醛性能的影响,对钢渣基生态活性炭配方进行优化。利用X-射线荧光光谱仪、激光粒度仪和比表面积及孔径测定仪对优化钢渣基生态活性炭进行表征。结果表明,影响钢渣基生态活性炭降解甲醛性能的主次因素依次为助磨剂用量>活性炭用量>无水乙醇用量>空白因素,助磨剂用量、活性炭用量与无水乙醇用量为独立作用因素。钢渣基生态活性炭的优化配方为助磨剂用量6 g、活性炭用量33 g和无水乙醇用量50g,12 h降解甲醛效率为61.7%。钢渣超细粉中磁性Fe2O3与催化性MnO的含量较高,有利于对甲醛进行吸附-催化。

Steel slag-based ecological activated carbon was prepared by steel slag and activated carbon. The effect of amount of grinding aid, amount of activated carbon and amount of absolute ethyl alcohol on formaldehyde degradation performance of steel slag-based ecological activated carbon were studied by orthogonal experimental design and range analysis, then, the preparation of steel slag-based ecological activated carbon was optimized. The optimal steel slag-based ecological activated carbon was characterized by X-ray fluorescence spectrometer, laser particle analyzer and specific surface area and pore size distribution analyzer. The results showed that the primary and secondary factors affecting the performance are respectively: amount of grinding aid>amount of activated carbon>amount of absolute ethyl alcohol>blank factors, the amount of grinding aid, amount of activated carbon and amount are independent with each other. The optimized program of steel slag-based ecological activated carbon is grinding aid 6 g, activated carbon 33 g and absolute ethyl alcohol 50 g, the formaldehyde degradation efficiency is 61.7% after 12 h. The contents of magnetic Fe2O3 and catalytic MnO in steel slag ultrafine powder were higher, which are benefit for adsorption-catalysis degradation of formaldehyde.