Abstract:

In this study,bamboo charcoal was modified with Fe³⁺/TiO₂ through percolation and high-temperature roasting treatments,and the final product was characterized by SEM and XRD. In the above-mentioned process,bamboo charcoal powder was used as carrier,and TiO₂ sol was prepared by a sol-gel method and then intermingled with Fe³⁺. Both a single factor test and an orthogonal experiment were applied in the investigation to explore the effects of the baking temperature,the Fe³⁺ content and the number of loading layers on the removal rate of formaldehyde. Based on the data analysis,an optimum process of Fe³⁺/TiO₂ modified bamboo charcoal was then determined. The results showed that bamboo charcoal,TiO₂ sol and Fe³⁺ can be well compounded according to SEM observation and XRD analysis. Among the three chosen factors,baking temperature had the most significant effect on the formaldehyde removal rate. The optimal preparation parameters for the modified bamboo charcoal were as follows: the baking temperature was 450 ℃,the number of load layers were 2,and the Fe³⁺ content was 1% to achieve the highest formaldehyde removal rate of 61%. This rate is higher than those of bamboo charcoal itself,and modified bamboo charcoal with TiO₂ only,which indicates that bamboo charcoal,Fe³⁺ and TiO₂ have a synergistic reaction driving the degradation of formaldehyde.

Key words: bamboo charcoal, TiO₂, Fe³⁺, sol-gel method, formaldehyde