Steel slag ultrafine powder was prepared with steel slag and grinding aid, it was used to modify activated carbon to obtain steel slag modified activated carbon. The influences of types of steel slag, amount of grinding aid and amount of steel slag ultrafine powder on formaldehyde degradation performance of steel slag modified activated carbon were studied. Chemical composition of steel slag, particle size distribution and structure of steel slag ultrafine powder, and microstructure of steel slag modified activated carbon were characterized by XRF, LPSA, FT-IR, BET and SEM, respectively. The results showed that the steel slag modified activated carbon prepared under the conditions of steel slag was hot braised slag, amount of grinding aid (ethylene glycol, triethanolamine and absolute ethyl alcohol mixed with volume ratio 1:1:1) was 6 g, amount of steel slag ultrafine powder was 10 g, amount of activated carbon was 30 g and amount of absolute ethyl alcohol was 50 g had good formaldehyde degradation performance, degradation rate of formaldehyde after 12 h was 60.9%. The high contents of Fe2O3 and MnO in hot braised slag were conducive to formaldehyde enrichment and catalytic degradation in activated carbon with porous structure. Appropriate amount of grinding aid could significantly reduce the particle size and improve the particle size distribution uniformity of steel slag ultrafine powder, which was beneficial to increase the contact area of steel slag ultrafine powder, activated carbon and formaldehyde. Appropriate amount of steel slag ultrafine powder could offset activated carbon adsorption performance decline due to the decrease of porosity and specific surface area, improve the formaldehyde degradation performance of steel slag modified activated carbon.
Hao ZHANG Yuandi XU Lei ZHANG Xiuyu LIU
. Preparation of steel slag modified activated carbon and its formaldehyde degradation performance[J]. The Chinese Journal of Process Engineering, 2019
, 19(6)
: 1228
-1233
.
DOI: 10.12034/j.issn.1009-606X.219132
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