Journal of Materials Chemistry A
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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
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
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2021
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IF 7.145
Xuehua Shen,Feng Yan,Zhen Zhang,Chunyan Li,Shiyin Zhao,Zuotai Zhang
Syngas production from biomass gasification is a promising technology, which is widely used in the chemical industry. Crop straw and red mud are typical agricultural and industrial wastes, respectively, which are cheap and widespread; however, they cause serious environmental pollution due to the open burning of straw and the toxicity and alkalinity of red mud. In the present work, we converted crop straw into syngas by chemical looping gasification using red mud as a sinter-resistant oxygen carrier. The reactivity of red mud, the syngas yields, and the air pollutant emissions under different conditions were systematically investigated through a thermo-gravimetric analyzer and mass spectrometer. Compared with pure Fe 2 O 3 , red mud can promote the syngas yields from crop straw gasification owing to the presence of inert Al 2 O 3 and SiO 2 . Red mud can effectively reduce the emission of air pollutants owing to the presence of alkaline components such as CaO and Na 2 O. As the Fe 2 O 3 /fuel mass ratio increases, the syngas yield increases and the air pollutant emissions simultaneously reduce; whereas the syngas yield and the air pollutant emissions decrease with increasing heating rate. After calcination at high temperature, the structure of red mud remains stable with slight agglomeration, and can be easily regenerated. Therefore, the promising results provide a breakthrough for efficient utilization and disposal of both crop straw and red mud.
研究领域:
环境科学
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能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
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2017
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IF 10.614
Shaopeng Rong,Pengyi Zhang,Yajie Yang,Lin Zhu,Jinlong Wang,Fang Liu
Formaldehyde (HCHO) causes increasing concerns, because of its ubiquitous presence in the indoor environment and its irritating and carcinogenic nature, with regard to humans. The fast abatement of HCHO is of significant practical interest at room temperature. In this paper, we fabricate a three-dimensional manganese dioxide framework (3D-MnO2), which has interconnected network structures, low mass density (∼7.3 mg cm–3), and high absorption capacity for organic liquids. In particular, the 3D-MnO2 showed excellent activity and stability for HCHO oxidation at room temperature, achieving 45% of 100 ppm of HCHO mineralized into CO2 under high gas hourly space velocity (GHSV = 180 L gcat–1 h–1). The excellent performance of 3D-MnO2 catalysts in decomposing HCHO can be ascribed to their quick reversibility and high water content for replenishing the consumed surface hydroxyl groups during HCHO decomposition, and fully exposed active reaction sites. It is valuable to know that inexpensive metal oxides such as MnO2 can transform ppm-level HCHO into harmless CO2 in a timeframe as brief as a subsecond at room temperature.
研究领域:
环境科学
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催化
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空气污染控制
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
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2023
·Vol. 15
·期 20
·14744
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IF 3.9
Muni Li,Peng Tan,Prabhat Kumar Rai,Yu Li,Huan Meng,Tong Zhang,Zhi Zhang,Weikang Zhang
Increasing concentrations of atmospheric particulate matter (PM) can cause a serious threat to urban air quality and human health. To reduce PM pollution in urban environments, pragmatic screening and planting of tolerant tree species can be effective and sustainable ways. However, our understanding of the effects of the capture ability of PM2.5on plant tolerance, and efforts to devise explicit assessment tools for suitability analysis for urban green belt plantations, are still inadequate. In this study, six common green tree species (Pinus tabuliformis,Abies holophylla,Juniperus chinensis,Salix babylonica,Robinia pseudoacacia, andPopulus alba) from three pollution sites in Shenyang City, China, were collected in order to assess their PM2.5capture ability, biochemical characteristics, leaf microstructures, and air pollution tolerance index (APTI). The results revealed that different sites and tested plant species can significantly affect the amount of PM2.5retained by leaf surfaces. The PM2.5retention amount ofAbies holophyllawas the highest at the SFH site and 1.41–8.89 times that of other tested species (p< 0.05). Morphological plant attributes, such as leaf surface roughness (r= 0.52 **) and contact angle (r= −0.57 **), were strongly related to the PM2.5retention amount. The PM2.5retention amount per unit leaf area had the strongest and most significant negative influence on total chlorophyll content (r= −0.743 **), indicating that the accumulation of leaf PM2.5reduced the photosynthetic efficiency of the plants. Among the tested plants,Robinia pseudoacaciahad the highest APTI value and was identified as the most resilient plant at all three sites, whereasJuniperus chinensishad the lowest APTI at all study sites. However, the integration of PM2.5capture ability with APTI showedPinus tabuliformisto be the best species for the construction of urban green belts in Shenyang City.Keywords:PM2.5;leaf microstructures;air pollution tolerance index;ascorbic acid;green belt plant
研究领域:
环境科学
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城市林业
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空气质量管理
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
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2021
·Vol. 76
·期 2
·1097-1106
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IF 2.097
Deng Guo-Zhe,Liu Xiong-Wei,Deng Jian-Jun,Cao Yi,Kang Xue-Jun,Zhu Huai-Yuan
Mercury (Hg) is one of the harmful pollutants in the atmosphere, and the determination of atmospheric Hg is a difficult task because of its low concentration in the air. Usually, use of an adsorbent for the enrichment of atmospheric Hg must be needed before an analysis of it in the air, but the conventional adsorbent materials are usually expensive and difficult to be prepared. In this study, a new composite membrane fabricated by electrospinning polystyrene integrated with thioglycollic acid was evaluated for the adsorption of Hg in the air. The morphological structure of the novel nanofiber membrane was characterized and their ability to capture atmospheric Hg was also investigated. The adsorptive capacity of nanofiber membrane for atmospheric Hg can be greatly improved after the incorporation of mercapto-function group, which was four times larger than that of the commercial quartz film. Furthermore, the electrospun nanofiber was easier to prepare compared with the traditional Hg adsorption material, sulfhydryl cotton, and exhibited lower pressure drop. It was found that thioglycollic acid-modified electrospun nanofibers can be a potential adsorbent for Hg in the air.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Hanxue Sun,Cailin Guo,Yanju Jing,Anli Yi,Jin Wang,Rui Jiao,Jiyan Li,Zhaoqi Zhu,Peng Mu,An Li
The air pollution caused by particulate matters (PMs) poses a severe threat to the human health. In particular, the fine particles with diameter smaller than 2.5 μm (PM 2.5 ) can be carriers of various bacteria and viruses, accelerating spread of epidemic. In this work, we synthesized two robust and flexible conjugated microporous polymer (CMP) aerogels for PMs removal, via one-step coupling polymerization of arylethynylenes and aryl halides with different molecular configuration. The resulting CMP aerogels comprise of hollow nanotubes with 3D porous network and high surface areas up to 660 m 2 /g. The efficiency of CMP aerogels for PM 2.5 and PM 10 was 99.5 ± 0.3 % and 99.8 ± 0.1 % with a long-term durability. In combination with their physicochemical stability and inherent surface hydrophobicity, a high efficiency for PM 2.5 filtration more than 99.6 ± 0.1 % also can be obtained at a high humidity at room temperature both for the two CMP aerogels. In addition, benefiting from the rich alkynyl groups in skeletons, post-modification of the resulting CMP aerogels with thiol-yne chemistry followed by silver ion uptake gives rise to antibacterial materials with outstanding activity for gram-positive strains far superior to other porous organic polymer materials. This work provides a new avenue to fabricate bifunctional CMPs derived porous aerogels for air filtration with high performance and antibacterial activity, and is expected to expand the application of CMPs in environmental purification.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2020
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IF 4.915
Hui Liu,Lifang Liu,Jianyong Yu,Xia Yin,Bin Ding
Air pollution resulted from particulate matter (PM) has rendered great risks to the global safety concerns. However, most existing filters used for air filtration are usually thick, bulky, and suffer from the trade-off between filtration capability and air permeability . Here, for the first time, an innovative electronetting technique is reported to create continuous and totally integrated 2D ultrathin polyacrylonitrile nanonets with true nanoscale fiber diameters (~30 nm) and 2D spider-web-like network structures. Such ultrafine diameters combined with their small pore sizes (~0.26 μm) endowed the 2D nanonet filters with greatly enhanced PM capture capacity (PM 0.3 removal efficiency of 99.996%). Meanwhile, the features of thin thickness (~0.4 μm), high porosity (92.1%), and ultra-light base weight (0.68 g m −2 ) allowed the filters to exhibit low air resistance of 73.5 Pa. This work may shed light on developing new type of high-performance air filters for environmental and public protection.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Jingyi Nie,Hongbin Xie,Meiyun Zhang,Jiantao Liang,Shuangxi Nie,Wenjia Han
Metal-organic frameworks (MOFs) have potential in the removal of air hazards such as particulate matter. Cellulose paper is low-cost, renewable and highly industrialized matrix. A facile strategy was proposed in the present work to efficiently integrate MOFs with cellulose paper, with zeolitic imidazolate framework-8 (ZIF-8) as the model. ZIF-8 was in situ synthesis in chitosan gel and subsequently added to the cellulose pulp to fabricate composite paper. The retention rate of ZIF-8 was 75.73 %, which was significantly superior to conventional filling method (4.15 %) and in situ precipitation method (6.52 %). Moreover, ZIF-8 in the composite paper functioned well in aspects of adsorption, filtration and sterilization. The PM 2.5 removal efficiency was 99.68 % with basis weight 60 g·m −2 , while the removal efficiency and pressure drop can be modulated by changing the basis weight of composite paper. This strategy may offer ideas to design MOFs/cellulose-based composite materials for particulate matter removal.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2016
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IF 3.976
Shalini Suryawanshi,Amit Singh Chauhan,Ritika Verma,Tarun Gupta
There is a growing concern regarding the adverse health effects due to indoor air pollution in developing countries including India. Hence, it becomes important to study the causes and sources of indoor air pollutants . This study presents the indoor concentrations of PM 0.6 (particles with aerodynamic diameter less than 0.6 μm) and identifies sources leading to indoor air pollution. Indoor air samples were collected at IIT Kanpur campus. Ninety-eight PM 0.6 samples were collected during November 2013 to September 2014. PM 0.6 concentration was measured using a single stage impactor type PM 0.6 sampler. The average PM 0.6 concentration indoor was about 94.44 μg/m 3 . Samples collected were then analysed for metal concentrations using ICP-OES (Inductively Coupled Plasma – Optical Emission Spectrometer). Eight metals Ba, Ca, Cr, Cu, Fe, Mg, Ni and Pb were quantified from PM samples using ICP-OES. Positive Matrix Factorization (PMF) was used for source apportionment of indoor air pollution. PMF is a factor analysis tool which helps in resolving the profile and contribution of the sources from an unknown mixture. Five possible sources of indoor pollutants were identified by factor analysis – (1) Coal combustion (21.8%) (2) Tobacco smoking (9.8%) (3) Wall dust (25.7%) (4) Soil particles (17.5%) (5) Wooden furniture/paper products (25.2%).
研究领域:
环境科学
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公共卫生
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Bo Zhang,Hongwen Chen,Liming Jiang,Youqing Shen,Dan Zhao,Zhuxian Zhou
Surface modification of natural cellulose fibers with nanomaterials is an effective strategy for producing functional textiles for multiple applications. A4-sized printing paper is a commonly used, cheap, and easily acquirable office supply which is mainly made of cellulose fibers. Here, we report green and simple nanofabrication of A4 paper to endow it with high capability for fragrance encapsulation and sustained release, and strong adsorption to indoor air pollutants. The method utilizes the sugar molecule of cellulose for in-situ growth of γ -cyclodextrin ( γ -CD) metal–organic frameworks (MOFs) on A4 paper. The obtained γ -CD-MOF/A4 nanocomposites have superior specific surface area and high porous structure. The γ -CD-MOF/A4 nanocomposites can effectively encapsulate fragrant molecules through host–guest interaction. The γ -CD-MOF/A4 nanocomposites also show strong absorption capability to formaldehyde and carbon dioxide through the formation of hydrogen bonding and chemical bonds. These γ -CD-MOF/A4 nanocomposites combine the advantages of both A4 paper and γ -CD-MOF, which can be used in indoor air freshening and cleaning.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ye Bian,Zhuolun Niu,Chencheng Zhang,Yue Pan,Yong Wang,Chun Chen
Metal-organic frameworks (MOFs) are currently one of the most attractive porous materials. Integrating MOFs into an organic polymer matrix is considered a promising approach for controlling air pollutants. Especially, the nanoscale miniaturization of MOFs is promising to serve as membranes for efficient air quality control. Here, we proposed the use of spray-initiation as a facile and rapid methodology to assemble homogeneous growth of nanoMOFs on the electrospun fibers, yielding the composite fiber with diameters smaller than 300 nm. The developed ZIF-8-encrusted nanofiber membrane achieved superior filtration performance. Compared with the filter without MOF growth, the MOF-encrusted nanofiber filter achieved enhanced filtration efficiency and almost no change in pressure drop. For the most penetrating particles, the ZIF-8-encrusted nanofiber filter can even reach a 10% increment. This work shows that introducing the MOF nanoparticles onto the nanofibers with homogenous distribution can significantly improve the capacity of the filters in controlling submicron particles, and provide an important reference for the rational design of structures of composite materials.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Tongling Xia,Chun Chen
Because of the relatively low pressure drop and high particle removal efficiency, nanofiber filter media can be potentially used for indoor particulate air pollution control. However, the influence of particle loading on the long-term performance of nanofiber filters in indoor particle control has not been well studied. This study first experimentally investigated the relationship between the pressure drop and solid particle loading mass for 42 nanofiber filter samples under various face velocities. The results show that the air resistance coefficient increased with the solid particle loading mass for the nanofiber filter media. Furthermore, the air resistance coefficient was positively associated with the face velocity, as a higher air velocity tended to make the particle cake tighter with higher resistance. Based on the experimental data, a semi-empirical equation was developed for predicting the pressure drop under different particle loading masses and face velocities. The developed semi-empirical model was then used to assess the long-term performance of an air cleaner equipped with nanofiber filter media in indoor PM 2.5 control. The case study demonstrated that an air cleaner equipped with nanofiber filter media could effectively control indoor PM 2.5 , but the lifetime of the nanofiber filter was shorter than that of traditional HEPA filters.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）