CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Junyan Liu,Jingxiao Liu,Fei Shi,Chuangchuang Ma,Tianci Li,Chaofan Chen,Muhammad Wasim,Keya Zhu,Huijun Sun,Ziwei Tian
Silica aerogels have fascinating prospects in the field of energy-saving and environmental purification, however, it is crucial to accurately control the pore structure of aerogel so as to achieve its super heat-insulation and adsorption performance. In this work, two pore size controllable methods were proposed to construct rigid/flexible silica aerogels with an extensive range of pore size by controlling the binding modes among the gel network using methyltriethoxysilane (MTES) as silica source. With the decrease of aerogel pore size from 20.8 µm to 82 nm, the visible light transmittance of wet gel increases from 0.1 % to 34 %. Correspondingly, the thermal conductivity decreases from 0.0567 W/(m·K) to 0.0383 W/(m·K) and then increases to 0.0410 W/(m·K), maintaining a low thermal conductivity in general and showing an excellent thermal insulation and heat preservation performance. In addition, the saturation adsorption capacity of volatile organic compounds (VOCs) such as dichloromethane, dimethylformamide and hexane increases with the increase of pore size of aerogel. The proposed pore size control strategy and the relationship between the pore structure and macroscopic performance of silica aerogels are very helpful for fabricating tailored rigid/flexible silica aerogels suitable for specialized applications.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yingguang Zhang,Muyan Wu,Yifei Wang,Yu Ho Kwok,Wending Pan,Wai Szeto,Haibao Huang,Dennis Y.C. Leung
The particular role of fluorine (F) doping in the photocatalytic activity of nanocrystalline titanium dioxide (TiO 2 ) towards toluene degradation was systematically studied. TiO 2 nanosheet catalysts doped with different amounts of F − (denoted by F-TiO 2 ) were synthesized by hydrothermal method. For comparison, calcination was performed on the catalyst to remove F - . The photocatalytic oxidation (PCO) of toluene over F-TiO 2 was found to be much higher than those of TiO 2 and commercial P25 under the irradiation of vacuum ultraviolet (VUV) light, with a high toluene degradation efficiency of about 90 %. Moreover, the toluene degradation efficiency increased to 96 % with the addition of only 1 wt.% α-MnO 2 nanowires, and the residual ozone (O 3 ) in the system can be completely eliminated. In addition, four different substrates were explored for catalyst coating to facilitate the operation and minimize catalyst loading, which can provide a promising strategy for practical volatile organic compounds (VOCs) abatement in industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ruijie Xie,Jian Ji,Kaiheng Guo,Dongxue Lei,Qingjuan Fan,Dennis Y.C. Leung,Haibao Huang
In this study, wet scrubber coupled with UV/peroxymonosulfate (PMS) was used as a semi-batch process for removing gaseous VOCs. Both ethyl acetate and toluene could be removed efficiently using this coupled process due to the generation of SO 4 − and HO . The mass-transfer coefficients in this coupled process were larger than in wet scrubbing only process. The roles of SO 4 − and HO were investigated, in which SO 4 − acted as the predominant radical for toluene degradation while HO was major for ethyl acetate. This could be further confirmed by simultaneous degradation of ethyl and toluene. Moreover, the reaction solution reused at least four times still showed excellent performance for VOCs removal via re-adding PMS. A possible mechanism on toluene degradation was proposed based on the evolutions of intermediates during the process. This study clarified the roles of non-selective radical (i.e. HO ) and selective radical (i.e. SO 4 − and Cl ) in the removal of a continuous-flow gaseous VOCs by this coupled process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 19
·5826-5831
·
IF 3.969
Keyong Hou,Fanglong Li,Wendong Chen,Ping Chen,Yuanyuan Xie,Wuduo Zhao,Lei Hua,Kemei Pei,Haiyang Li
An in-source, stretched, hollow fiber membrane (HFM) inlet has been developed to improve the sensitivity of on-line time-of-flight mass spectrometry (TOFMS) with a vacuum ultraviolet (VUV) lamp based single photon ionization (SPI) source for the direct analysis of liquid samples. A 2-cm HFM was stretched to 8 cm in length, and placed in the ion source and directly under the VUV lamp window with a distance of 15 mm. Compared with the conventional flow-through configuration under the same experimental conditions, the signal intensities of selected volatile organic compounds (VOCs) of methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), benzene, toluene and p-xylene were increased over 5-fold in magnitude, and the response time was shortened to one-third. The limits of detection (LOD) of MTBE, ETBE, benzene, toluene and p-xylene ranged from 0.25 to 1.3 μg L−1 with a measurement time of 60 s, and three orders of linear range were obtained with correlation coefficients of 0.9972–0.9992. The present results suggest that the in-source stretched HFM is a simple and effective way to increase the sensitivity and shorten response time of the membrane inlet, and we believe that it will also be beneficial to other types of on-line mass spectrometer for the on-line analysis of VOCs in water with a VUV lamp based SPI ion source.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuo Yang,Zhiwei Shao,Ling N. Jin,Liuwen Chen,Xiang Zhang,Mingliang Fang,Dan Li,Jianmin Chen
Volatile organic compounds (VOCs) are significant pollutants found in various environments, posing health risks. Traditionally, the gaseous VOCs are adsorbed and eluted in liquid phases, and then subjected to toxicity testing, which deviates from the actual exposure scenarios of gaseous VOCs. How the physical states of VOCs (gaseous or liquid) affect their toxicity has not been well understood. This study examined the baseline toxicity of VOCs in both gaseous and liquid phases using a self-assembled passive colonization hydrogel (SAPCH) with luminous bacteria ( Vibrio fischeri ). The findings revealed that gaseous VOCs exhibited higher baseline toxicity than their liquid counterparts, attributed to the higher free energy and electronic activity of gaseous VOC molecules. Furthermore, the study elucidated that the differences in electronic transitions and energy gaps significantly impact the combined toxicity of VOC mixtures in different phases. Understanding these differences is crucial for assessing the real-world impact of VOCs on health and the environment.
研究领域:
环境生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Li,Tongtong Xia,Jiacheng Xu,Chunle Zhang,Li Xu,Zuliang Wu,Shuiliang Yao
CeO 2 /γ-Al 2 O 3 catalysts with distinct crystallite sizes were synthesized by changing the precursors of ceria. CeO 2 /γ-Al 2 O 3 prepared by cerium nitrate (CN) had smaller crystalline size than samples prepared by cerium chloride or cerium acetate. They were evaluated in the plasma catalytic oxidation reaction of n -undecane (C11), which is one of the representative long-chain alkane volatile organic compounds (VOCs). CeO 2 (CN)/γ-Al 2 O 3 displayed a higher C11 conversion of 100 % with 72 % of CO 2 selectivity under ambient conditions with an energy density of 205 J/L, while samples with larger crystalline sizes showed lower activities. X-ray photoelectron spectroscopy analysis confirmed that more concentration of adsorbed oxygen species and higher ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) existed on the surface of CeO 2 /γ-Al 2 O 3 samples with smaller crystalline size. Chemisorption experiments further verified that surface oxygen vacancies resulted in the different catalytic activities. In situ diffuse reflectance infrared Fourier transform spectroscopy analyses showed that the oxidation capability of intermediates by-products enhanced with the decrease of crystalline size. Results revealed that the crystallite size of CeO 2 had a significant effect on the redox properties. This research provides an insight into the regulation of oxygen vacancy in transition metal oxides to facilitate the plasma catalytic performance of alkane VOCs under mild reaction conditions.
研究领域:
催化
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yaru Wang,Jiaqin He,Xunxun Li,Mengmeng Wang,Yuanbo Zhou,Jun Xiao,Dongyun Chen,Jianmei Lu
MnO2 nanotubes loaded with Pt and Ni–Fe spinel were synthesized using simple hydrothermal and sol–gel techniques. After loading with Ni–Fe spinel, the specific surface area of the material increases 3-fold. This change helped to provide more active sites and facilitated the association between the catalyst and volatile organic compounds (VOCs). X-ray photoelectron spectroscopy determined that the adsorbed oxygen concentrations were all greatly increased after Pt loading, indicating that Pt promoted the adsorption of oxygen and so accelerated the combustion process. The performance of the catalyst after loading with 2 wt % Pt was greatly improved, such that the T90 for benzene decomposition was decreased to 113 °C. In addition, the 2% Pt/2Mn@NFO exhibited excellent low-temperature catalytic activity when reacting with low concentrations of toluene and ethyl acetate. This work therefore demonstrates a viable new approach to the development of Mn-based catalysts for the low temperature catalytic remediation of VOCs.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Miaomiao Ye,Ningyao Tao,Xiaojiao Zhou,Xingyuan Wang,Wen Jin,Tuqiao Zhang,Xiaowei Liu
Salt accumulation and volatile organic compounds (VOCs) entering condensed freshwater are two main drawbacks in the new approach of solar-driven seawater desalination. In this work, a super-hydrophilic honeycomb activated carbon (SHHAC) evaporator was fabricated for simultaneous salt rejection and VOCs removal. The optimal water evaporation rate of the SHHAC evaporator was as high as 1.50 kg·m −2 ·h −1 under one sun illumination with the corresponding photothermal conversion efficiency of 99.4 %. Due to the super-hydrophilic properties, high water absorption capacity, fast water absorption rate and unique honeycomb structure of SHHAC, the salt-rejection property of the SHHAC evaporator was achieved by flowing back the concentrated brine to the underneath seawater. Simultaneously, the distillation concentration ratio (R D ) of phenol was reduced from 75 % to 0 % by the SHHAC evaporator resulting in zero phenol entering condensed freshwater. Finally, the potential application of the SHHAC evaporator was demonstrated by an expanded outdoor experiment using the real seawater as the feedwater.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 4
·239
·
IF 4.2
Yanjia Ma,Ming Hou,Li Yang,Jiyun Gao,Guozhu Zhang,Ronghui Guo,Shenghui Guo
In this study, we report on the rapid preparation of WO3nanoplates decorated with noble metals and evaluate their gas-sensing performance using a high-throughput screening technique. The incorporation of Pd significantly enhanced the gas-sensing properties, and, among all of the samples tested, the WO3nanoplate containing 0.3 mol% Pd exhibited the highest response to 100 ppm xylene at 250 °C (Ra/Rg= 131.2), which was almost 56 times greater than that of the pure WO3sample. Additionally, this sample demonstrated rapid response and recovery times (τresponse= 3.9 s andτrecovery= 189.2 s, respectively). The nanoplate samples were also classified and screened using cluster analysis, and the selected samples were optimized for use in a sensor array. By applying principal component analysis and Fisher discriminant analysis, four typical gases were identified and a potential sensitization mechanism was elucidated.Keywords:high-throughput screening;volatile organic compounds;WO3;surface modification;array optimization
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Yongsheng Jia,Donghang Chen,Zhongyu Jiang,Xiaolong Wang,Zhaoyu Zhou,Long Zhao,Limin Guo
The conversion of CO 2 into activated carbon (AC) for the adsorption of volatile organic compounds (VOCs) is a green strategy to treat waste by waste. In this study, CO 2 was converted into a series of mesopore-enriched AC (MS-AC 500 , MS-AC 550 , and MS-AC 600 ) by molten salt (MS) electrochemical method under different temperatures, and the prepared adsorbents were employed for the rapid adsorption of VOCs. The results showed that MS-AC 500 , MS-AC 550 , and MS-AC 600 had a rich internal pore structure with specific surface area and pore volume of 816.70, 1062.05, 1255.50 m 2 /g and 0.58, 0.73, 0.84 cm 3 /g, respectively. The pore structures and surface chemistry of the adsorbents were positively correlated with the adsorption capacity , the adsorption amounts of MS-AC 500 , MS-AC 550 , and MS-AC 600 were 244.89, 306.38, 414.39 mg/g for toluene and 279.29, 366.19, 460.10 mg/g for chlorobenzene , respectively. The superior adsorption capacity for chlorobenzene is mainly because chlorobenzene is a polar molecule and the C-O bonds inside the adsorbents have an attractive effect on the unpaired electrons inside the polar molecule. Simulation of the adsorption process of the adsorbents confirmed that the adsorption of both toluene and chlorobenzene was a physical adsorption process. Moreover, the adsorption-desorption cycle of chlorobenzene was more stable than that of toluene, and the durability of the adsorbent was above 95% after 5 cycles. This study can remove VOCs while reducing CO 2 greenhouse gas, providing a feasible green route to treat waste by waste.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Qiyi Lu,Bingying Gao,Xiazhang Li,Feng Xiong,Chenxi Zhuang,Chao Yao
Significant advances have been made in the treatment of volatile organic compounds (VOCs), but effective adsorption in humid environments remains a critical challenge. A trade–off typically exists between improving hydrophobicity and maintaining adsorption capacity. In this work, we present an innovative approach to enhance hydrophobicity without compromising adsorption performance. Palygorskite (Pal) was coated with a molecular sieve (type: MCM–41) via an in–situ growth method, and the resulting composite (Pal/M) was further modified with 3–aminopropyl triethoxysilane (APTES) to prepare NH 2 –Pal/M through post–synthesis modification. By increasing the silicon content, reducing hydroxyl groups, and introducing amine groups, the hydrophobicity of the material was significantly enhanced while preserving its adsorption properties. NH 2 –Pal/M exhibited superior adsorption capacity compared to pure Pal and MCM–41, achieving a maximum adsorption capacity of 291 mg·g −1 for formaldehyde and 322 mg·g −1 for acetaldehyde in static adsorption tests. In dynamic experiments at 0 % humidity, NH 2 –Pal/M achieved breakthrough times of 67 min (breakthrough adsorption capacity: 3.946 mg·g −1 ) for formaldehyde and 49 min (8.420 mg·g −1 ) for acetaldehyde. Even at 80 % humidity, it retained breakthrough times of 24 min (1.399 mg·g −1 ) for formaldehyde and 18 min (3.122 mg·g −1 ) for acetaldehyde, demonstrating its hydrophobic nature and effective performance in humid conditions. This study highlights a cost–effective approach to synthesizing adsorbent materials from natural porous minerals, providing a practical solution for VOCs treatment in water vapor–rich environments such as industrial emissions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yueping Wang,Yequn Huang,Lianping Song,Hong Wang,Li Wan,Jinqian Pang,Wenjuan Liang
Insight investigation on both edible pulps and inedible parts involving inflorescence axis and shreds of Artocarpus heterophyllus Lam were carried out, a total of 98 VOCs and 201 masses were identified by the combination of HS-SPME-GC–MS and PTR-TOF-MS. Among them, according to the consistency of OAV and results of VIP > 1, p < 0.05, compounds methyl isovalerate ( A2 ), 3-methylbutyl acetate ( A5 ) and octanoic acid, ethyl ester ( A21 ) were recognized as aroma markers to distinguish the pulps, shreds and inflorescence axis. Meanwhile, the inflorescence axis (IC 50 : 1.82 mg/mL) and shreds (IC 50 : 16.74 mg/mL) exhibited more excellent antioxidant potency than pulps (IC 50 : 17.43 mg/mL) in vitro . These findings validated the feasibility of coupling HS-SPME-GC–MS and PTR-TOF-MS for rapid detection of characteristic VOCs of this plant, and offered new prospect of fragrance utilization and waste management of the edible and inedible parts of A. heterophyllus fruit.
研究领域:
植物科学
·
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）