Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 17
·8171-8194
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IF 11.301
Yuanzhi Li,Shaowen Wu,Jichun Wu,Qianqian Hu,Chongyang Zhou
CO and volatile organic compounds (VOCs) as main air pollutants are discharged in large quantities from various industrial processes. They are not only hazardous to human health, but also harmful to the air environment. Currently, catalytic combustion using supported noble metal catalysts is commercially used for the abatement of air pollutants in various industrial processes due to high catalytic efficiency and long-term durability. The major challenge for catalytic combustion is large energy consumption. Photocatalytic oxidation provides a low energy consumption approach as it utilizes inexhaustible solar energy. The major challenges for photocatalytic oxidation are low catalytic efficiency and prone deactivation. Photothermocatalytic oxidation provides a very promising approach for the abatement of air pollutants. It perfectly combines the advantages of catalytic combustion and photocatalytic oxidation. Photothermocatalytic abatement of air pollutants follows a mechanism of light-driven thermocatalytic oxidation, which is considerably enhanced by a novel photoactivation that is completely different from photocatalysis on semiconductor photocatalysts. This review will discuss the light-driven thermocatalytic oxidation mechanism and the novel photoactivation, and summarize several strategies of designing efficient photothermocatalysts such as nanostructured transition metal oxides, supported noble metal catalysts, nanocomposites of transition metal oxides and semiconductor photocatalysts, and so on.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·908
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IF 5.3
Renjun Si,Yan Li,Jie Tian,Changshu Tan,Shaofeng Chen,Ming Lei,Feng Xie,Xin Guo,Shunping Zhang
In this work, we studied the influence of cross-interference effects between VOCs and NO on the performance of SnO2and Pt-SnO2-based gas sensors. Sensing films were fabricated by screen printing. The results show that the response of the SnO2sensors to NO under air is higher than that of Pt-SnO2, but the response to VOCs is lower than that of Pt-SnO2. The Pt-SnO2sensor was significantly more responsive to VOCs in the NO background than in air. In the traditional single-component gas test, the pure SnO2sensor showed good selectivity to VOCs and NO at 300 °C and 150 °C, respectively. Loading noble metal Pt improved the sensitivity to VOCs at high temperature, but also significantly increased the interference to NO sensitivity at low temperature. The explanation for this phenomenon is that the noble metal Pt can catalyze the reaction between NO and VOCs to generate more O−, which further promotes the adsorption of VOCs. Therefore, selectivity cannot be simply determined by single-component gas testing alone. Mutual interference between mixed gases needs to be taken into account.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
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2023
·Vol. 43
·期 6
·1651-1672
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IF 3.6
Zhang Lei,Zou Zhuorui,Lei Zhang,Jia Yang
In this research, xylene was utilized as a simulated gas, γ-Al 2 O 3 pellets were selected as catalyst carriers, and FeO x , MnO x , CeO x , and CuO x were used as active components to analyze the synergistic treatment of VOCs–O 3 by low-temperature plasma combined with supported catalysts. Different metal oxides and other factors influence the synergistic treatment of VOCs–O 3 . The results showed that the catalytic effect of Fe–Mn/γ-Al 2 O 3 prepared by the equivalent volumes of consecutive impregnation method was better than that of Fe–Mn/γ-Al 2 O 3 prepared by co-impregnation method. When combined with low temperature plasma technology, high-energy electron collision reaction and oxidation reaction between free radicals occurs, which played a synergistic role in the degradation of VOCs–O 3 . The total removal rate of xylene was 94.88%, and the depletion rate of ozone was 84.1%.
研究领域:
環境科學
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化學工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Yongsheng Jia,Donghang Chen,Yan Li,Enze Li,Long Zhao,Limin Guo
In this study, CO 2 was converted to activated carbon by the molten salt CO 2 capture and electrochemical conversion (MSCC-EC) method, and the surface oxygen content of the activated carbon was further modified for the adsorption of polar molecules (chlorobenzene) and nonpolar molecules (toluene), the role of the pore structure and surface O-containing functional groups of the adsorbents in contributing to the adsorption process was systematically investigated. The results showed that MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 have rich pore structures with specific surface areas of 811.56 m 2 /g, 835.35 m 2 /g, 1249.104 m 2 /g, and surface oxygen contents of about 10 %, 15 %, 15 %, respectively. The toluene adsorption capacity of MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 was 203.82 mg/g, 229.72 mg/g, and 358.97 mg/g, respectively, and was dominated by pore adsorption, which was positively proportional to the specific surface areas and pore volumes, the adsorption process belonged to the pseudo-first-order kinetic model. The adsorption amounts of chlorobenzene by MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 were 287.98 mg/g, 363.11 mg/g, and 495.41 mg/g, respectively. In addition to the pore adsorption, the oxygen content on the surface of the adsorbents had a non-negligible promotion effect on the adsorption of chlorobenzene, mainly because chlorobenzene is a polar molecule, and the asymmetric electrons on its surface have strong interactions with the O-containing functional groups on the surface of the adsorbents. Moreover, the prepared adsorbents were thermally stable, and the decay rate of adsorption performance was less than 5 % after five adsorption–desorption cycles.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Jun Liu,Daiyong Ye
In order to remove VOCs in paints and coatings as more as possible, photo-curable waterborne polyurethane acrylates (WPUAs) were synthesized and an easy process to obtain low VOCs and low odor by the devolatilization technology was investigated. It was found that VOCs contents and WPUAs odors were significantly reduced by using the deionized water as the devolatilization aid chemical. With the conditions that the temperature was 75 °C, vacuum degree was 0.085 MPa, and the added deionized water content was 3 wt%, the VOCs content of WPUA was 33.6 mg/g with odor level 2 after devolatilization. Moreover, in the process of devolatilization, the increasing temperature strengthened the mass transfer process, thus the removal efficiency of VOCs was improved. Comparison with the WPUA coatings without devolatilization, the photo-cured films of deodorized WPUA coatings showed good thermal stability and excellent mechanical properties due to most of the solvents and small molecular impurities were removed. The WPUA coatings with low VOCs not only reduced environmental pollution, but also improved their coatings quality. At the same time, the devolatilization technology had the characteristics of simplicity and efficiency. Therefore, it was suitable for industrial production of organic photo-curable coatings in order to protect both environment and people's health as much as possible.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
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IF 1.193
Lei CHEN,Yu ZHANG,Bin SUN,Juan HE,Shuai KANG,Zhong-Qiu HUA,Chen TIAN
The production of a large number of metal oxide semiconductor materials is more for design needs, while theoretical exploration is relatively less concerned. In this work, WO 3 nanoparticles were prepared by the tungstic acid thermolysis method, and the catalysts of Pt and Ru were loaded on the surface of nanoparticles with a wet impregnation method. As expected, the sensitive responses were enhanced significantly with the additional loading of Pt, which revealed that bimetallic loading could achieve better properties with a smaller loaded amount than single metal. According to the power-law response to oxygen and H 2 -TPR results, the sensitization mechanism of noble metals loaded WO 3 to acetone as the typical VOCs was investigated. The results showed that the sensing processes were dominated by oxygen adsorption behavior and there was no difference with the loading of Ru. Furthermore, the power-law coefficient n became smaller with Pt loading. It is proposed that oxygen adsorbates on the surface become more active due to Pt. We would like to propose further a perspective, i.e., polymetallic loading that utilizes the properties of different metals to achieve synergism.
研究领域:
材料科学
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传感器技术
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表面化学
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DOI
高影响因子
Separations
·
2025
·Vol. 12
·期 4
·86
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IF 2.7
Wenlin Hang,Jiaxing Sun,Ronghang Zhao,Heng Chen,Jinjin Li
The presence of abundant water vapor in industrial organic waste gases greatly reduces the selective adsorption of volatile organic pollutants (VOCs). The polarity of the adsorbent and VOC molecules plays an important role in the adsorption process, especially in the presence of water vapor. In this paper, commercial coconut shell activated carbon (CSC) was modified by a thermal reduction treatment to obtain heat-treated coconut shell activated carbon (HCSC). CSC and HCSC exhibited similar pore structure characteristics but differed significantly in surface oxygen content (10.97% and 7.55%, respectively). Dynamic adsorption breakthrough experiments were conducted to determine the dynamic adsorption capacities of toluene on both adsorbents under varying relative humidity levels. HCSC demonstrated superior toluene/water vapor adsorption selectivity. Further analyses of toluene adsorption kinetics, activation energy, and water vapor adsorption isotherms revealed that the lower surface oxygen functional group content of HCSC resulted in a weaker surface polarity, facilitating the adsorption of weakly polar toluene. This was attributed to stronger toluene–HCSC interactions and weaker water–HCSC interactions. The dynamic adsorption capacities of three VOCs with varying polarities were also tested on HCSC. The observed VOC/water vapor adsorption selectivity had the following order: toluene > n-heptane > 1,2-dichloroethane. Grand Canonical Monte Carlo (GCMC) simulations were employed to quantify the relationship between the adsorption selectivity of eight VOCs with varying polarities and their molecular polarity. The results indicated a decrease in adsorption selectivity with increasing VOC polarity. A mechanistic analysis suggests that more polar VOCs prefer to adsorb polar oxygen-containing functional groups, competing with water molecules for adsorption sites. Under high humidity, hydrogen bonding leads to the formation of water clusters, exacerbating this competition. This research holds significant implications for the efficient selective adsorption of VOCs with varying polarities in humid industrial conditions.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Chao Xiong,Can Xue,Xingrui Yu,Yaorong He,Yichao Liang,Xiantai Zhou,Hongbing Ji
Under the background of carbon dioxide emission reduction, how to realize the treatment and the high value-added conversion of typical olefin volatile organic compounds (olefin-VOCs), such as styrene , is a big challenge. In this contribution, the ceria-supported coinage metal catalysts (M/CeO 2 , M = Au, Ag, and Cu) are successfully synthesized by a dry mechanochemical method, and their catalytic performance for styrene-VOC epoxidation with tert -butyl hydrogen peroxide (TBHP) as an oxidant to prepare high-value styrene oxide (SO) is investigated. The oxygen vacancies of ceria play a key role in the anchoring of metal nanoparticles . After ball milling, Au(III) is partially reduced and coexists on ceria in two valence states (Au 3+ and Au 0 ), and the reactive oxygen species of the as-prepared catalyst are enhanced. The catalytic behaviors, including solvents effect, substrate concentration, oxidant ratio, catalyst dosage, reaction time, and temperature, are systematically investigated. Au/CeO 2 exhibits good styrene epoxidation performance with a total styrene conversion of 94% and a SO yield of 63%, along with good reusability and substrate scalability. Thermodynamics and kinetics show that Au/CeO 2 was more favorable for styrene epoxidation and this reaction is dominated by the rate of intrinsic chemical reactions on the surface of the catalyst. Based on experimental discussions and a set of characterizations (XPS, XRD, in-situ FT-IR, ESR, ESI-HSMS, etc.), the mechanism is revealed as the synergistic catalysis between the reactive oxygen species of Au/CeO 2 and the peroxide radicals generated by the homolysis of TBHP.
研究领域:
催化化学
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环境科学
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材料科学
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PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2025
·Vol. 40
·期 4
·1176-1185
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IF 1.1
Hu Zhengsheng,Tang Xu,Gao Shilong,Li Yingguang,Wang Jiawei,Chen Yanjun,Wang Yifeng
Modified activated carbons (AS) were fabricated through the oxidation effect of ammonium persulfate and applied to the dynamic adsorption of different acrylate gas. The pore structures, surface chemical properties and surface morphology of AS were respectively characterized by N 2 adsorption, Boehm titration, X-ray Photoelectron Spectroscopy (XPS) and scanning electron microscopy (SEM) techniques. After modification, the specific surface area increased from 954 to 1 154 m 2 ·g −1 . The contents of oxygen-containing functional groups on the AS surface increase obviously and have a great effect on the adsorption behavior of acrylate gases. According to the results of dynamic adsorption, the adsorption capacities of acrylates are as the following order: methyl acrylate (461.9 mg·g −1 ) > methyl methacrylate (436.9 mg·g −1 ) > butyl acrylate (381.8 mg·g −1 ), which is attributed to the size adaptability of AS pores and acrylates. The adsorption behavior of AS for acrylate gases conforms to the Bangham model and the Temkin model.
研究领域:
环境科学
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化学工程
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材料科学
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物理化学
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分析化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Xiaobo Zhai,Ying Chen,Dongli Han,Junchi Zheng,Xiaohui Wu,Zhao Wang,Xiaolin Li,Xin Ye,Liqun Zhang
Bis-(γ-triethoxysilylpropyl)-tetrasulfide TESPT (Si69) is the most popular silane coupling agent for green tires. However, a large amount of alcohol vapours (a kind of volatile organic compounds (VOCs)) release when it is used for tire production, which can make the process harmful to tire quality and people’s health. In this work, M x -Si69 (x = 1, 2, 3, 4, 5, 6), a series of silane coupling agents were successfully synthesized by transesterification of fatty alcohol polyoxyethylene ether-9 (AEO-9) with Si69. A series of Si69 molecule grafted with one to six fatty alcohol polyoxyethylene ether chains (the long alkoxy chain) (named as M 1 -Si69 to M 6 -Si69) were produced. The FT-IR and 1 H NMR results revealed that six coupling agents named M 1 -Si69 ~ M 6 -Si69 could be obtained by adjusting the molar ratio of the reactive monomers. So, the VOCs emission could be reduced by 37.5%~100% theoretically because of the long chain reaction products. The FT-IR and TGA results demonstrated that M x -Si69 could successfully modify silica. Then, silica/rubber compounds were prepared by adding these low VOCs coupling agents namely M 1 -Si69 ~ M 6 -Si69. The dynamic and static mechanical results indicated that silica/rubber compound made by adding M 2 -Si69 had the lowest Heat-Build up, the best wet skid resistance, and extremely low rolling resistance (it can save more than 20% energy consumption than Si69).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMOSPHERE
·
2022
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IF 8.943
Dongxue Lei,Xiaowen Xie,Yongjie Xiang,Xiongfei Huang,Fei Xiao,Jianping Cao,Guangqing Li,Dennis Y.C. Leung,Haibao Huang
The elimination of volatile organic compounds (VOCs) via vacuum ultraviolet (VUV) photolysis is greatly limited by low removal efficiency and gaseous byproducts generation, while photocatalytic oxidation of VOCs suffers from catalytic deactivation. Herein, a coupled process of gaseous VUV photolysis with aqueous photocatalytic oxidation with P25 as the catalyst was firstly proposed for efficient aromatic VOCs removal (VUV/P25). The removal efficiency of toluene reached 86.2% in VUV/P25 process, but was only 33.6% and 58.1% in alone gaseous VUV photolysis and aqueous ultraviolet photocatalytic oxidation (UV/P25) process, respectively. Correspondingly, the outlet CO 2 concentration in VUV/P25 process reached 132 ppmv. Toluene was firstly destructed by high-energy photons generated from gaseous VUV photolysis, resulting in its incomplete oxidation to form soluble intermediates including acids, aldehydes, esters. These soluble intermediates would be further degraded and mineralized into CO 2 in subsequent aqueous UV/P25 process. Notably, the concentrations of intermediates in VUV/P25 were much lower than those in VUV photolysis, indicating the synergy effect of VUV photolysis and UV/P25 process. The stability tests proved that VUV/P25 process maintained an excellent toluene degradation performance and P25 did not suffer from catalytic deactivation. In addition to toluene, the VUV/P25 system also achieved the efficient and sustainable degradation of styrene and chlorobenzene , suggesting its good application prospect in industrial VOCs treatment. This study proposes an efficient and promising strategy for deep oxidation of multiple aromatic VOCs in industries.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tingting Zhu,Xin Song,Tianle Li,Junpeng Hu,Kai Qi,Panting Gao,Rongji Cui,Zhicheng Tang
The biological fermentation industry faces a challenge in simultaneously purifying complex sulfur-containing volatile organic compounds (VOCs) and reducing tail gas emissions. This is due to the multi-step purification process required for sulfur-containing VOCs and the high energy usage involved. The adsorption performance and controllability of elements in hydrotalcite-like compounds are noteworthy and have the potential to enhance the catalytic purification of sulfur-containing VOCs. This study utilizes Mn-based hydrotalcite-like compounds as a highly efficient catalyst for the simultaneous catalytic removal of complex sulfur-containing VOCs such as ethanol (C 2 H 5 OH), acetaldehyde (CH 3 CHO), and diethyl sulfide (C 4 H 10 S). The study successfully achieves the simultaneous and efficient removal of sulfur-containing VOCs at a temperature of 325 °C. The removal rates of three types of gas pollutants can reach 100 % for 420 min, 450 min, and 360 min, respectively. Meanwhile, the VOCs breakthrough capacity is 426 mg/g. The competitive adsorption effect, adsorption sites, and reaction mechanism were investigated using experimental and theoretical calculation methods. The simultaneous adsorption of three gases resulted in competitive adsorption, with the priority order of adsorption being CH 3 CHO > C 4 H 10 S > C 2 H 5 OH. The various adsorption effects were attributed to the formation of Mg–O–H…O-C, O…O=C, and Mn–O–H…S-C, respectively. CH 3 CHO was initially adsorbed at the O-Top site, while C 4 H 10 S was adsorbed at the Mn-Top site. C 2 H 5 OH was adsorbed at the Mg-Top site. High-temperatures promote the oxidation of elemental S to sulfate. The primary reason for catalyst deactivation is the buildup and coating of sulfate on the surface of the catalyst. The main active sites responsible for the catalytic oxidation of C 4 H 10 S were Mn 2+ and Mn 3+ . The oxygen defects act as active sites for the oxidation of C 2 H 5 OH and CH 3 CHO. C 2 H 5 OH undergoes gradual oxidation to form CH 3 CHO and CH 3 COOH (acetic acid), which are further oxidized to CO 2 and H 2 O. C 4 H 10 S was oxidized to elemental S and eventually to sulfate. The experimental results in this work are consistent with the theoretical results, providing a theoretical basis for the simultaneous catalytic removal of sulfur-containing VOCs.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）