[논문]그래핀 기반 광촉매 담지 세라믹필터에서 질소산화물(NOx)의 제거

김용석; 김영호

doi:10.14478/ace.2022.1104

그래핀 기반 광촉매 담지 세라믹필터에서 질소산화물(NOx)의 제거
Removal of NOx from Graphene based Photocatalyst Ceramic Filter 원문보기

공업화학 = Applied chemistry for engineering, v.33 no.6, 2022년, pp.600 - 605

김용석 (한경대학교 식품생명화학공학부 화학공학전공) , 김영호 (한경대학교 식품생명화학공학부 화학공학전공)

초록
AI-Helper

V₂O₅-WO₃-TiO₂ 촉매를 담지하여 그래핀(graphene) 기반 세라믹필터를 제조하였으며, 이를 활용하여 질소산화물(NO_x)의 제거실험을 수행하였다. 산화그래핀(graphene oxide, GO)은 흑연(graphite)을 이용하여 Hummer's method에 의해 제조하였고 환원제로 히드라진(N2H4)을 통해 환원 산화그래핀(reduced graphene oxide, rGO)을 제조하였다. 제조된 그래핀을 세라믹필터 표면에 유-무기 하이브리드 원리를 이용하여 코팅하였으며, 여기에 광촉매물질을 담지하였다. 광촉매물질은 바나듐(V), 텅스텐(W), 티타늄(Ti)를 사용하여 sol-gel법에 의해 코팅 후 350 ℃ 소성 공정을 통하여 광촉매담지 세라믹필터를 제조하였다. UV광을 제조된 필터에 조사하여 NO_x의 제거 실험을 수행하였으며, NO_x의 제거 효율은 기존의 세라믹필터보다 GO 및 rGO가 코팅된 경우가 우수하였다. 이는 코팅된 그래핀에 의한 흡착성의 향상 때문으로 판단되며, 그래핀의 농도가 증가함에 따라 보다 높은 NO_x의 제거효율을 확인하였다.

Abstract ▼ AI-Helper

In this study, nitrogen oxide (NOx) removal experiments were performed using a graphene based ceramic filter coated with a V2O5-WO3-TiO2 catalyst. Graphene oxide (GO) was prepared by Hummer's method using graphite, and the reduced graphene oxide was produced by reducing with hydrazine (N2H4). Vanadium (V), Tungsten (W), and Titanium (Ti) were coated by the sol-gel method, and then a metal oxide-supported filter was prepared through a calcination process at 350 ℃. A NOx removal efficiency test was performed for the catalytic ceramic filters with UV light in a humid condition. When graphene oxide (GO) and reduced graphene oxide (rGO) were present on the filter, the NOx removal efficiency was superior to that of the conventional ceramic filter. Most likely, this is due to an improvement in the adsorption properties of NOx molecules on graphene coated surfaces. As the concentration of graphene increased, higher NOx removal efficiency was confirmed.

주제어

표/그림 (6)

그림 Figure 1. Schematic of NO_x reduction efficiency reactor.
그림 Figure 2. Comparison of the FT-IR spectrum of GO and rGO and Graphite.
그림 Figure 3. EDS analysis of (a) Ceramic filter, (b) rGO-Ceramic filter, (c) V/W/Ti@rGO-Ceramic filter.
그림 Figure 4. NO_x removal efficiency by according to type of ceramic, (a) base, metal, GO, rGO, (b) base, metal / GO@Ceramic, metal / rGO@Ceramic, (c) concetration by 1, 5, 10wt% GO, (d) concentration by metal and 5wt% GO, (e) concentration by 1, 5, 10wt% rGO, (f) concentration by metal and 5wt% rGO.
표 Table 1. Atomic(%) of Ceramic Filter by EDS Analysis
표 Table 2. NO_x Reduction Efficiency Results

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