Building Simulation
·
2020
·Vol. 13
·期 4
·873-886
·
IF 2.472
Xia Tongling,Bian Ye,Shi Shanshan,Zhang Li,Chen Chun
When the outdoor PM 2.5 pollution is severe, if the windows are open, the occupants tend to be exposed to higher indoor PM 2.5 of outdoor origin. However, if the windows are closed, the ventilation rate tends to be insufficient for removing air pollutants generated indoors. Opening windows with the use of nanofiber window screens can be an alternative strategy that can balance between indoor PM 2.5 of outdoor origin and ventilation rate. This study fabricated a number of nanofiber window screens and conducted a series of experiments in a laboratory setup to measure the PM 2.5 removal efficiency and pressure drop with different window opening angles. A simple model was then developed for predicting the pressure drop, and the measured data was used to validate the model. Finally, the measured data and the validated model were used for two application cases. In the natural ventilation case, the use of nanofiber window screens can effectively reduce indoor PM 2.5 of outdoor origin, and the ventilation rate can be improved when compared with infiltration in the house. However, the nanofiber window screens could not reduce the PM 2.5 level in the kitchen with a range hood when the cooking PM 2.5 emission rate was high.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
BUILDING AND ENVIRONMENT
·
2020
·
IF 4.971
Ding-Chao Zhang,JunJie Liu,Cong Wang,Yong Liu,Jia-Hua Wang,Xu Han
Given that the toxic hexanal in indoor air is primarily originated from the cooking oil fumes, it is necessary to purify hexanal in the cooking oil fumes to prevent the adverse health effects of hexanal to human beings. In this study, four typical metal-organic frameworks (MOFs), namely MIL-101 (Cr), UiO-66, ZIF-8 and Cu-BDC were synthesized and applied to purify the indoor hexanal, and their adsorption capacities to hexanal were compared with the commercial activated carbon (AC). Our results show that the adsorption capacities of hexanal follow the order of MIL-101(Cr) (135 mg g −1 )> UiO-66 (64.3 mg g −1 )> ZIF-8 (40.3 mg g −1 )> AC (35.8 mg g −1 )> Cu-BDC (32.5 mg g −1 ), and the desorption capacities (by air) follow the order of MIL-101(Cr) (55.5 mg g −1 )> UiO-66 (26.1 mg g −1 )> AC (24.5 mg g −1 )>ZIF-8 (19.3 mg g −1 )> Cu-BDC (5.5 mg g −1 ), indicating that hexanal adsorbed on MIL-101 (Cr)/UiO-66 is more appropriate than the commercial AC to be desorbed. FTIR analysis confirms that O–H in Cr–OH/Zr–OH, O–C–O and aromatic C–H in H 2 BDC in both MIL-101 (Cr) and UiO-66 are possible sites for hexanal adsorption. DFT calculations further reveal that Cr–OH/Zr–OH and aromatic C–H in H 2 BDC are important sites to interact with C O in hexanal. This study provides a possibility to purify indoor aldehyde contaminants by the highly porous MOF materials.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jinxiu Lou,Wei Wang,Huijie Lu,Lin Wang,Lizhong Zhu
Intensified use of disinfectants to control COVID-19 could unintentionally increase the disinfection byproducts (DBPs) in the environment. In indoor spaces, it is critical to determine the optimal disinfection practice to prevent the spread of the virus while keeping DBPs at relatively low levels in the air. The formation of DBPs exceed 0.1 μg/mg while hypochlorite dosed at >10 mg/m 3 . The total DBP concentrations in highly disinfected places (100–200 mg/m 3 hypochlorite) were as high as 66.8 μg/m 3 , and the Hazard Index (HI) was up to 0.84, and both values were much higher than those in less disinfected places (<10 mg/m 3 hypochlorite). Taking into account the HI, formation yields and the origin of the DBPs, we recommended 10 mg/m 3 as the suggested hypochlorite dose to minimize DBPs generation during routine disinfection for controlling the coronavirus. DBPs in indoor air could be eliminated by ventilation, reducing the usage of personal care products, and wiping the solid surface with water before or after disinfection. These results highlighted the necessity to control air-borne DBPs and their associated health risks arising from intensified disinfection, and will guide the further development of evidence-based regulation on DBP exposure during disinfection and improve public health protection.
研究领域:
环境科学
·
公共卫生
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xianhua Zhang,Yuan Liang,Fan Liu,Jie Liu,Bin Yu,Wenbo Li,Mengyu Yuan,Haozhe Tang,Yanchao Zhao,Dongxiao Ji,Kangkang Ou,Jianxin He,Xiaoyan Sun,Weili Shao
Among indoor air pollutants, particulate matter with a diameter less than 2.5 μm (PM 2.5 ) and volatile organic compounds with small molecules are the greatest threat to human health. However, complete removal of these pollutants is challenging, and the incomplete removal causes secondary pollution. In this study, manganese dioxide nanoparticles (MnO 2 NPs) were controllably grown on the surface of mullite nanofibers (MNFs) using a potassium permanganate (KMnO 4 ) reduction method to prepare MNF@MnO 2 composite membranes that could effectively remove PM 2.5 and formaldehyde from indoor air. After loading the optimal amount of MnO 2 NPs, the filtration efficiency of a nanofiber membrane for salt particles with diameters of 0.3 μm increased from 97.32 % to 99.47 %, and the removal rate of formaldehyde reached 88.3 % within 170 min in the closed laboratory space. After five repeated tests, the formaldehyde decomposition rate remained above 80 %. The MNF@MnO 2 membrane was successfully used to prepare an indoor air purifier filter element, demonstrating considerable potential for improving the indoor air quality and reducing health risks.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yangwei Xiang,Huan Xu
Increased amounts of chlorine disinfectant have been sprayed to inactivate viruses in the environment since the COVID-19 pandemic, and the health risk from chemicals, especially disinfection byproducts (DBPs), has unintentionally increased. In this study, we characterized the occurrence of haloacetic acids (HAAs) and trihalomethanes (THMs) in indoor air and evaluated their formation potential from typical indoor ingredients. Subsequently, the adverse effect of chloroacetic acid on A549 cells was depicted at the proteomic , transcriptional and silico levels. The results revealed that the total concentrations of HAAs and THMs ranged from 1.46 to 4.20 μg/m 3 in ten indoor environments . Both classes of DBPs could be generated during the chlorination of prevalent terpenes by competing reactions, which are associated with the volatile state of indoor ingredients after disinfection. The C-type lectin receptor signaling pathway and cellular senescence were significantly perturbed pathways, which interfered with the development of lung fibrosis. The negative effect was further investigated by molecular docking and transcription, which showed that HAAs can interact with four C-type lectin receptor proteins by hydrogen bonds and inhibit the mRNA expression of related proteins. This study highlights the potential secondary biological risk caused by intensive DBPs generated from chlorination and draws our attention to the potential environmental factors leading to chronic respiratory disease.
研究领域:
环境科学
·
分子生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
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
·
公共卫生
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
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
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Food Science & Technology
·
2025
·
IF 2.8
Yifei Zhang,Zhenyu Fan,Daming Fan,Mingfu Wang,Yueliang Zhao
Cooking oil fumes contain various volatile organic compounds, such as aldehydes, which are major indoor air pollutants. Our previous study found that quercetin significantly inhibited the aldehyde emissions from heat-treated soybean oil. In this study, a simulated frying system was established to evaluate the inhibitory effects of 18 flavonoids with different structures on aldehyde emissions from heat-treated oil, and the structure–activity relationship was analyzed. The results showed that the flavonoids with an o-dihydroxyl group (3′,4’-o-dihydroxyl) in the B-ring and containing a 2,3 double bond and a 4-carbonyl group in the C-ring had stronger inhibition efficiency on the emissions of aldehydes. Flavanols containing galloyl groups have a strong inhibitory effect on aldehyde emissions. Isoflavones showed a relatively poor inhibitory efficiency. Further studies showed that flavonoids have selective inhibitory effects on the emissions of aldehydes. For example, flavonols exhibit stronger inhibitory activity against the emissions of 2-butenal, 2-ethylacrolein, t-2-hexenal, heptanal, octanal, and t,t-2,4-heptadienal. Flavanols exhibit stronger inhibition, specifically against the emissions of hexanal, heptanal, heptenal, and octanal. In addition, there was no significant correlation between the antioxidant activity of flavonoids and their inhibitory effects on aldehyde emissions. This study revealed the structure–activity relationship of flavonoids in inhibiting aldehyde emissions from heat-treated soybean oil and provided theoretical support for selecting appropriate natural plant compounds to inhibit aldehyde emissions from heated oil and reduce indoor air pollution.
研究领域:
食品科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhenrui Li,Haifeng Zuo,Minglei Su,Zhenbing Sun,Jianfeng Ma,Xing’e Liu,Pengyi Zhang
Continuous adsorption removal of trace VOCs under humid conditions, especially when the relative humidity (RH) is ≥50 %, faces great challenges in indoor air purification. Herein, we synthesized super-activated carbons (LSACs) using alkali lignin extracted from black liquor via potassium hydroxide (KOH)-assisted chemical activation. The LSAC-3 with ultra-high specific surface area ( S BET : 2535 m 2 /g) and microporosity (92.4 %) was then covalently grafted with the CF 2 groups onto its surface through a [2 + 1] cycloaddition reaction to significantly enhance humidity resistance. After modification, the LSAC-3-CF 2 preserved adsorption sites to the greatest extent, with a minimal loss of S BET , at only 4.9 %. Moreover, LSAC-3-CF 2 , which contained a trace fluorine element (0.55 %), exhibited excellent hydrophobic performance, with a water contact angle (WCA) of 153.7°. The dynamic adsorption experiments further demonstrated that LSAC-3-CF 2 exhibited superior trace toluene adsorption capacity, with 145.9 mg/g at 50 RH% and 46.0 mg/g at 80 RH%, respectively, superior to many reported adsorbents. In addition, LSAC-3-CF 2 displayed excellent regeneration performance after three dynamic adsorption cycles. The adsorption mechanism of toluene on LSAC-3-CF 2 could be attributed to (1) the improved π-π stacking interaction between toluene molecules and the adsorbent surface, and (2) the reduced hydrogen bond interaction between water molecules and oxygen-containing groups onto the adsorbent surface due to the covalent grafting of CF 2 group. This study provides valuable insights and design references for developing adsorbents that can effectively adsorb trace VOCs under high humidity conditions, offering potential solutions for improving indoor air quality.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Xiangming Fang,Guanhong Lu,Asad Mahmood,Zhihong Tang,Ziwei Liu,Linlin Zhang,Yan Wang,Jing Sun
A novel ternary mica/TiO 2 /Fe 2 O 3 composite pearlescent pigment has been designed for the photocatalytic oxidation of gas-phase acetaldehyde in the application of indoor air purification. The mica/TiO 2 /Fe 2 O 3 -x (MTF-x, x = m Fe2O3 : m TiO2 = 0.5–2: 100) composites were synthesized by a sol-gel assisted hydrothermal method. The MTF-1.5 composite shows optimal photocatalytic performance, which is 1.8 times photodegradation efficiency and 2.2 times CO 2 mineralization efficiency higher than those of pure TiO 2 . The enhanced photocatalytic performance of MTF-x (x = 0.5–2) composites could be associated with enhanced reflectivity of mica, which eventually improved the light absorption properties. Also, the presence of TiO 2 /Fe 2 O 3 heterostructure facilitated charge separation in the MTF ternary composite. Besides, superoxide radical was proven as the decisive active species for the degradation of gaseous acetaldehyde. This work provides a systematic approach to develop a potential multi-functional pearlescent pigment to purify indoor air.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Bibai Du,Yuqing He,Bowen Liang,Jiehua Li,Dan Luo,Hui Chen,Liang-Ying Liu,Ying Guo,Lixi Zeng
Triazine UV filters are an important class of UV filters, but knowledge on their environmental occurrence and human exposure remains largely unknown. In this study, we performed a targeted analysis of 17 emerging triazine UV filters in indoor dust and indoor air from South China based on a newly developed LC–MS/MS method. A total of 12 of the 17 emerging triazine UV filters were first positively detected in the dust and air samples. Ethylhexyl triazone (EHT) and bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) were identified as the most abundant compounds. The median total concentrations of triazine UV filters reached 3860 ng/g in indoor dust and 1590 pg/m3 in indoor air. Gas-particle partitioning analysis showed that triazine UV filters were predominant in the particle phase in ambient air. Significant concentration correlations were observed among most triazine UV filters. The estimated daily intake of triazine UV filters through dust ingestion and air inhalation for toddlers under high-end exposure scenarios was up to 839 ng/kg bw/day, but a lack of toxic thresholds hampers accurate risk assessment. Our work highlights another emerging class of UV filters that significantly contribute to indoor chemical mixtures and expresses concerns over their occurrence and human exposure.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Huixian Zhou,Yiqing Zeng,Zexian Low,Feng Zhang,Zhaoxiang Zhong,Weihong Xing
Developing cost-effective and high-efficient air purification materials for enhancing the indoor air quality has been an ongoing concern. Herein, MnO 2 /Co–C catalyst layers were wrapped on SiO 2 nanofiber by a combination of thermal pyrolysis and redox reaction method to prepare catalytic membranes (MCCS-x) for the efficient purification of indoor PM and HCHO. The core-dual-shell structure maintains the pore structure of the membrane, providing high gas permeability of 670 m 3 ·m −2 ·h −1 ·kPa −1 . Owing to the introduction of MnO 2 /Co–C enhanced the capture of PM, the optimized MCCS-2 exhibits high filtration efficiency of PM 0.3 and PM 2.5 (99.60% and 99.99%) with a low pressure drop (<80 Pa). In addition, MCCS-2 achieves 100% HCHO removal efficiency at room temperature due to its large specific surface area, high redox property and abundant Mn 4+ and oxygen species. The appropriate proportion of Mn/Co bimetallic sites synergy inhibits the formation of formate and carbonate intermediate species, thus MCCS-2 possesses excellent long-term catalytic stability than contrast sample (MCCS-3 and MS). This work demonstrates a new approach for the fabrication of high-performance catalytic membrane materials for indoor air purification.
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
危险品化学品经营许可证（带存储）