TiO_(2)-BiVO_(4)-RGO复合催化剂与等离子体协同脱除空气中甲醛的研究

Synergistic Removal of Formaldehyde from Air by TiO_(2)-BiVO_(4)-RGO Composite Catalyst and Plasma

甲醛是室内空气污染物(VOCs)的典型代表,严重影响人体健康。将二氧化钛和钒酸铋两种光催化剂通过溶剂热法与还原氧化石墨烯复合制备出TiO_(2)-BiVO_(4)-RGO复合催化剂,并将其与等离子体结合进行脱除甲醛研究,常温下,空速为16500 h-1时,甲醛的脱除率高达91.4%,产生了较强的协同作用。实验结果表明,TiO_(2)-BiVO_(4)-RGO复合催化剂在等离子体的作用下产生了较高的催化活性,说明等离子体产生的富能电子、活性自由基能够与TiO_(2)-BiVO_(4)-RGO复合光催化剂作用使其产生大量的电子和空穴,实现甲醛的氧化脱除。在同样条件下,溶剂热法制备的TiO_(2)-BiVO_(4)复合催化剂与等离子体结合对甲醛的脱除率为87.1%,表明还原氧化石墨烯在脱除甲醛的过程中起到了重要的促进作用。

Formaldehyde is the representative of typical indoor air pollutants(VOCs),which seriously affects human health.TiO_(2)-BiVO_(4)-RGO composite catalyst was prepared by solvothermal method and reduction of graphene oxide by titanium dioxide and bismuth vanadate photocatalyst,combining with plasma to study the removal of formaldehyde.At room temperature,the space velocity was 16500 h-1,the removal rate of formaldehyde was as high as 91.4%,resulting in a strong synergistic effect.The experimental results show that TiO_(2)-BiVO_(4)-RGO composite photocatalyst has high catalytic activity under the action of plasma,indicating that the energyrich electrons and active free radicals produced by plasma can interact with TiO_(2)-BiVO_(4)-RGO composite photocatalyst to produce a large number of electrons and holes to achieve the oxidative removal of formaldehyde.Under the same conditions,the removal rate of formaldehyde by the combination of TiO_(2)-BiVO_(4) composite catalyst prepared by solvothermal method and plasma is 87.1%,indicating that the reduction of graphene oxide plays an important role in the removal of formaldehyde.