Influence of humidity on the photo-catalytic degradation of acetaldehyde over TiO₂ surface under UV light irradiation

Seo, Hyun Ook,Park, Eun Ji,Kim, Il Hee,Han, Sang Wook,Cha, Byeong Jun,Woo, Tae Gyun,Kim, Young Dok Elsevier 2017 CATALYSIS TODAY - Vol.295 No.-

<P><B>Abstract</B></P> <P>We have studied the influence of water vapors on the activity of the photo-catalytic oxidation of acetaldehyde on the surface of TiO<SUB>2</SUB> film under UV light (365nm) irradiation. Photo-catalysis experiments were performed at atmospheric conditions under various humidity levels (0, 16.8, and 33.6 relative humidity%) using a high vacuum chamber equipped with online gas-chromatography as a batch-type reactor. Acetaldehyde and H<SUB>2</SUB>O molecules competitively adsorbed on the surface of TiO<SUB>2</SUB> film and the increase in the humidity decreased both the acetaldehyde removal and CO<SUB>2</SUB> evolution rates. The rate of CO<SUB>2</SUB> evolution was even more influenced by the humidity level of the gas mixture compared to the acetaldehyde removal rate, particularly over the certain level of relative humidity. We evidenced that the total oxidation of acetaldehyde was majorly mediated by oxygen molecules rather than H<SUB>2</SUB>O vapor under our experimental conditions. It is suggested that photo-catalytic total oxidation of acetaldehyde was promoted by the presence of large active sites ensemble near the adsorbed acetaldehyde, which were available to oxygen. Increase of humidity level disturbed this large ensemble, resulting in the reduction of photo-catalytic degradation rate of acetaldehyde under UV light irradiation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Higher humidity level decreased the photo-catalytic mineralization of acetaldehyde. </LI> <LI> The total mineralization of acetaldehyde was majorly mediated by O<SUB>2</SUB>. </LI> <LI> Water vapor was competitively adsorbed on TiO<SUB>2</SUB> surface with acetaldehyde and O<SUB>2</SUB>. </LI> <LI> Water molecules inhibited the adsorption of the acetaldehyde and O<SUB>2</SUB>. </LI> <LI> Active sites ensemble promoted the total mineralization of acetaldehyde. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Co-application of liquid phase plasma process for hydrogen production and degradation of acetaldehyde over NiTiO₂ supported on porous materials

Chung, Kyong-Hwan,Jeong, Sangmin,Lee, Heon,Kim, Sun-Jae,Jeon, Ki-Joon,Park, Young-Kwon,Jung, Sang-Chul Elsevier 2017 International journal of hydrogen energy Vol.42 No.38

<P><B>Abstract</B></P> <P>Photocatalytic decomposition of acetaldehyde-contained wastewater was assessed for the degradation of pollutants and the production of hydrogen. Liquid phase plasma was applied in the photoreaction as a light source. The evolution of hydrogen and acetaldehyde degradation were characterized by the photocatalytic decomposition system. Ni-loaded TiO<SUB>2</SUB> photocatalysts and various porous materials were introduced to the photocatalytic reaction. The photochemical decomposition by irradiation of the liquid phase plasma without photocatalysts produced some hydrogen evolution with the degradation of acetaldehyde, which was attributed to the decomposition of the reactant by active species generated by the irradiation of liquid phase plasma. The Ni loading on TiO<SUB>2</SUB> brought out an enhancement of acetaldehyde degradation and hydrogen evolution. In the photocatalysis of acetaldehyde-contained wastewater using the liquid phase plasma, hydrogen evolution was accelerated due to the additional hydrogen production by the photocatalytic decomposition of acetaldehyde. The porous materials could be used as an effective photocatalytic support. MCM-41 mesoporous material has acted as a highly efficient photocatalytic support to the TiO<SUB>2</SUB> photocatalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The decomposition using liquid phase plasma was assessed in acetaldehyde-containing wastewater. </LI> <LI> The effects of irradiation of the liquid phase plasma were evaluated over Ni-loaded TiO<SUB>2</SUB>. </LI> <LI> The acetaldehyde was degraded gradually with the progress of the photochemical reaction. </LI> <LI> The Ni/TiO<SUB>2</SUB> brought out an enhancement of acetaldehyde degradation and hydrogen evolution. </LI> <LI> Hydrogen evolution was increased not only from the photocatalytic decomposition of acetaldehyde. </LI> </UL> </P>

Transient receptor potential A1 mediates acetaldehyde-evoked pain sensation

Bang, Sangsu,Kim, Kyung Yoon,Yoo, Sungjae,Kim, Yoon Gyoon,Hwang, Sun Wook Published on behalf of the European Neuroscience A 2007 The European journal of neuroscience Vol.26 No.9

<P>Abstract</P><P>Six transient receptor potential (TRP) ion channels expressed in the sensory afferents play an important role as body thermosensors and also as peripheral pain detectors. It is known that a number of natural compounds specifically activate those sensory neuronal TRP channels, and a well-known example is cinnamaldehyde for TRPA1. Here we show that human and mouse TRPA1 are activated by acetaldehyde, an intermediate substance of ethanol metabolism, in the HEK293T cell heterologous expression system and in cultured mouse trigeminal neurons. Acetaldehyde failed to activate other temperature-sensitive TRP channels expressed in sensory neurons. TRPA1 antagonists camphor and gadolinium, and a general TRP blocker ruthenium red inhibited TRPA1 activation by acetaldehyde. Camphor, gadolinium and ruthenium red also suppressed the acute nociceptive behaviors induced by the intradermal administration of acetaldehyde into the mouse footpads. Intradermal co-application of prostaglandin E2 and acetaldehyde greatly potentiated the acetaldehyde-induced nociceptive responses, and this effect was reversed by treatment with the TRPA1 antagonist camphor. These results suggest that acetaldehyde causes nociception via TRPA1 activation. Our data may also help elucidate the mechanisms underlying acetaldehyde-related pathological symptoms such as hangover pain.</P>

Acetaldehyde의 해독에 대한 glutathione의 영향

이완구,박용훈 내무부 국립과학수사연구소 2000 國立科學搜査硏究所年報 Vol.32 No.-

에탄올과 에탄올의 대사산물이 방광근의 수축에 미치는 영향

김형지,문현,이길호 大韓泌尿器科學會 1998 Korean Journal of Urology Vol.39 No.9

TiO₂ 광촉매를 이용한 아세트알데히드 제거

김수진 ( Su-jin Kim ),서성규 ( Seong-gyu Seo ),김상채 ( Sang-chai Kim ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.2

아세트 알데히드의 광촉매산화를 조사하기 위하여 보통의 졸-겔 법으로 TiO₂ 광촉매를 합성하고 450, 650와 850 ℃온도에서 소성하여 제조하였다. TiO₂ 광촉매의 구조적 특성은 XRD와 FE-SEM으로 조사하였다. TiO₂ 광촉매의 XRD 분석 결과는 450 ℃에서 소성한 촉매에서는 아나타제상만 형성 되었고 650 ℃에서는 루타일과 아나타제의 혼합상이 형성되었으며 850 ℃에서는 루타일 상만 나타났다. 유량과 아세트 알데히드 농도를 변화시키면서 고정층 광반응기을 이용하여 TiO₂ 광촉매의 제거효율을 평가하였다. 광원으로는 UV-A(15W, black light, 365nm)와 UV-C(15W, germicidal, 254nm)를 이용하였다. 소성온도에 따른 광촉매의 활성순서는 650 ℃>450 ℃>850 ℃이었다. 실험결과는 TiO₂ 광촉매의 활성은 루타일과 아나타제 구조의 혼합상과 밀접한 관계가 있었다. 아세트알데히드의 광촉매산화는 유량 그리고 광원, 농도와 같은 여러 조작인자에 크게 의존함을 알 수 있었다. 즉, 광촉매성능은 유량과 유입농도를 을 감소시키면 향상되었다. 특히, 아세트 알데히드의 완전제거는 800ppm 농도이하에서 이루어졌고 UV-A에 비하여 UV-C가 아세트알데히드의 분해를 현저히 향상시켰다. 더욱이 수증기의 첨가는 아세트알데히드의 제거를 촉진시켰다. In order to investigate the photocatalytic oxidation of acetaldehyde, the TiO₂ photo catalyst was synthesized by using a conventional sol-gel method at three different calcination temperatures (450, 650, and 850℃). XRD and FE-SEM were used to examine the structural characteristics of the prepared TiO₂ photo catalyst. XRD patterns of TiO₂ samples revealed that the anatase type phase formed at 450 ℃ and then started to occur the rutile-anatase coupled phase at 650 ℃ and finally changed into the rutile structure at 850 ℃. A fixed bed photo reactor was used to assess the removal efficiency of acetaldehyde by varying flow rate and concentrations. Two different light sources UV-A (15W, black light, 365 nm) and UV-C (15W, germicidal, 254 nm) have been employed for the comparison of photo catalytic ability. The order of photo catalytic activity for the oxidation of acetaldehyde with respect to the calcinations temperature were 650 ℃ > 450 ℃ > 850 ℃. The experimental result supported that TiO₂ photo catalytic activity was closely related to the combination between rutile and anatase structure. The photocatalytic oxidation of acetaldehyde was strongly dependent on several operating factors such as flow rates, light sources, and feed concentrations. In other words, the photocatalytic performance was improved by decreasing the feed flow rate and the inlet concentration. Especially, complete removal of acetaldehyde could be achieved below the concentration of 800 ppm and the UV-C with 254 nm intensity greatly enhanced the decomposition of acetaldehyde compared to that of the case of UV-A with black light. Furthermore, the addition of water vapor into the feed gave a favorable enhancement for the removal of acetaldehyde.

구미국가산업단지의 아세트알데히드 악취모델링

이은주 ( Eun Ju Lee ),무하매드사이드 ( Muhammad Saeed Akhtar ),임광희 ( Kwang Hee Lim ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.1

본 연구에서는 CALPUFF 모델링을 수행하여 구미국가산업단지 공단지역에 악취로 인한 주민의 민원이 빈번한 지역과 아세트알데히드 배출 주요 점오염원인 구미국가산업단지 공단지역 합성섬유제조업체 악취배출시설과의 상관관계를 정립하고자 하였다. 본 연구의 CALPUFF 모델링 결과로서 T사 배출설비 개선 후에 구미공단의 아세트알데히드 농도의 최대값이 T사 배출설비 개선 전보다 O (10-5 g/m3)에서 O (10-6 g/m3)으로 저감되고 겨울(1월)과 봄(4월)에 구미 1공단의 아세트알데히드 농도가 개선되어서 구미 3공단에서 자주 아세트알데히드 농도의 구미공단 내 최대값이 도출되었다. 또한 T사 배출설비 개선 후에 도출된 아세트알데히드 농도의 구미공단 내 최대값 예측범위는 T사 배출설비 개선 전의 구미공단 내 최대값 예측범위보다 개선되었다. 이와 같은 총괄 점오염원의 아세트알데히드 기여도 평가 예측을 위한 CALPUFF 모델링 최대값은 ‘구미대구지역 HAPs 조사연구’의 측정 최대값 결과와 비교하였을 때에 상호비교할 수 있는 비슷한 값을 보였고 민원추세와도 잘 일치하였다. 따라서 본 연구에서 총괄 점오염원의 아세트알데히드 기여도 평가 예측에 대한 유효성을 보여주었다. 한편 총괄 점오염원에서의 아세트알데히드 배출에 의하여 확산된아세트알데히드 농도에 대한 T사 점오염원의 상대적 기여도가 T사 배출설비 개선 후에 개선 전보다 대부분 배 이상낮아짐이 예측되었다. 반면에 이에 대한 W사 점오염원의 상대적 기여도는 T사 배출설비 개선 후가 T사 배출설비 개선 전보다 배 이상 증가하였다. 이것은 T사 배출설비 개선에 의하여 상대적으로 W사 점오염원의 아세트알데히드 기여도가 커졌음을 의미하였다. In this study CALPUFF modeling was performed to establish a correlation between regions of frequent civil odor complaints near Gumi national industrial complex and odor-emission facilities of synthetic fiber manufacturers in the same area as main acetaldehyde-emission point sources. As a result of the CALPUFF modeling, the maximum concentration of acetaldehyde in Gumi national industrial complex was reduced from O (10-5 g/m3) to O (10-6 g/m3) upon improving emission facilities of T company so that the maximum concentrations of acetaldehyde frequently appeared in complex 3. In addition, the predicted range of the maximum acetaldehyde concentration in Gumi national industrial complex was also improved in comparison with that prior to improving emission facilities of T company. These maximum concentrations of acetaldehyde obtained to estimate the expected contribution of total acetaldehyde point source by CALPUFF modeling showed the similar values to those measured in ‘HAPs investigation in the region of Gumi-Daegu’ and were consistent to the trend of civil odor complaints. Therefore, the expected contribution of total acetaldehyde point source was validated. The relative contribution of T company upon improving its emission facilities was predicted to be lowered by more than factor of two, compared to that prior to improving its emission facilities. To the contrary, the relative contribution of W company upon improving emission facilities of T company was predicted to be increased by more than factor of two, compared to that prior to improving emission facilities of T company. This indicates that the contribution of aldehyde point sources of W company was relatively increased upon improving emission facilities of T company.

아세트알데하이드 흡착을 위한 활성탄의 첨착 및 개질 효과

박진찬,김동민,이종대 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3

In this study, the acetaldehyde removal characteristics of activated carbon (AC) for air purifier filters were investigated using metal catalysts-impregnation and functional group-modification method. The AC with a high specific surface area(1700 m2/g) and micropores was prepared by KOH activation of coconut charcoal and the efficiency of catalyst and functional group immobilization was examined by varying the drying conditions within the pores after immersion. The physical properties of the prepared activated carbon were analyzed by BET, ICP, EA, and FT-IR, and the acetaldehyde adsorption performances were investigated using gas chromatography (GC) at various impregnation and modified conditions. As the concentration of impregnation solution increased, the amount of impregnated metal catalysts increased, while the specific surface area showed a decreasing trend. The adsorption tests of the metal catalyst- impregnated and functional group-modified activated carbons revealed that excellent adsorption performance in compositions MgO10@AC, CaO10@AC, EU10@AC, and H-U3N1@AC, respectively. The MgO10@AC, which showed the highest adsorption performance, had a breakthrough time of 533.8 minutes and adsorption capacity of 57.4 mg/g for acetaldehyde adsorption. It was found that the nano-sized MgO catalyst on the activated carbon improved the adsorption performance by interacting with carbonyl groups of acetaldehyde.

Efficacy Verification of Four Hangover Cure Products for Reducing Blood Alcohol and Acetaldehyde Concentrations in Sprague–Dawley Rats

한민지,진유정,정세영 한국생명과학회 2022 생명과학회지 Vol.32 No.2

Recently, many hangover cure products containing natural ingredients have been made available in the market that are effective for alcohol-related liver damage or for improved liver function. However, the cure for of liver damage or medication for improved liver function are different from hangover cure. Therefore, the efficacy hangover cure products needs to be verified. In this study, we investigated and compared the ameliorating effect of four commercially available hangover cure products on acute ethanol-induced hangover in Sprague–Dawley rats. The four samples were labeled as C, M, R, and S. The efficacy of the samples was evaluated based on the serum concentration and area under the curve (AUC) of blood ethanol and acetaldehyde concentrations to quantitatively assess the hangover cure effect. Ethanol administration to the rats significantly raised the serum alcohol and acetaldehyde levels. The Cmax reduction rates of ethanol for the samples C, M, R, and S were 5.9%, 3.1%, 8.4%, and 11.7%, and the AUC were 8.9%, 2.2%, 12.1%, and 19.6%, respectively, whereas the Cmax reduction rates of acetaldehyde were 14.2%, 15.2%, 28.2%, and 35.0%, and the AUC were 21.6%, 7.5%, 22.4%, and 29.9%, respectively. In conclusion, all samples showed a tendency to relieve hangover in the order of S, R, C, and M in terms of the ethanol concentration, but only sample S showed a statistically significant decrease in both Cmax and AUC for ethanol and acetaldehyde. These results suggest that an objective method for verifying the efficacy of hangover cure products is lacking.

연구보문 : 수질환경 ; 먹는샘물의 보관 기간에 따른 formaldehyde 및 acetaldehyde의 농도 변화

이연희 ( Youn Hee Lee ),이준배 ( Jun Bae Lee ),박주현 ( Ju Hyun Park ),최자윤 ( Ja Yoon Choi ),안경희 ( Kyung Hee Ahn ),안혜실 ( Hye Sil Ahn ),권오상 ( Oh Sang Kwon ),김태승 ( Tae Seung Kim ),한진석 ( Jin Suk Han ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.3

BACKGROUND: According to Korean regulations, bottled waters (BWs) can not be treated with chemical disinfectants like chlorine, so UV and ozone disinfection is applied. During the past several years, chemicals were detected in some BWs, and the public was concerned about the safety of BWs. METHODS AND RESULTS: Mineral waters were stored for 180 days at 25℃ and 50℃, tested acetaldehyde and formaldehyde by HPLC. When mineral waters were put in a PET bottles, the formaldehyde level ranged from 5 to 66 μg/L during 180 days at 50℃. While the acetaldehyde level ranged from 31 to 221 μg/L, it was low than 16 μg/L in glass bottle. CONCLUSION(s): This result showed that formaldehyde and acetaldehyde were detected higher in PET bottles than glass bottles, these also increased depending on the time of storage. Concentration of formaldehyde and acetaldehyde could be significantly influenced by the time of storage and temperature.