JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 98
·期 1
·204-212
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IF 3.709
Xin Guo,ChunXiao Ren,Siqi Jiang,Jisheng Li,Shuai Zhang,Yichuan Wang,Weiting Ma,Ye Yang,Chenglong Ma,Zhiyong Su,Zhiyuan Wang,Yufeng Hu,Zhichang Liu
BACKGROUND Recent works have shown how to develop methods with specific economic and environmental aspects; this is the main motivation for research on energy efficient processes and environmentally friendly materials for formaldehyde (HCHO) storage. One specific goal is to improve the adsorption capacity for HCHO by constructing closely contacted connections with absorbents. RESULTS In this study, two ionic liquids (ILs), 1-methylimidazole hydrogen sulfate [MIM][HSO 4 ] and Imidazole hydrogen sulfate [IM][HSO4] as newly developed absorbents for HCHO storage are applied for the first time. Based on thermogravimetric analysis (TGA) and nuclear magnetic resonance (NMR) results, it is concluded that their exceptional capacity for storage of HCHO is 31.07 and 34.60 (g formaldehyde)⋅(mol ionic liquid) −1 , respectively. In addition, to study the renewability of HCHO, the decomposition rates of the reaction products (as a function of decomposition time and decomposition temperature) were measured. The optimal kinetic model was selected to satisfy the formation and decomposition processes of the products. Thereafter, the activation energy ( E ), pre-finger factor ( A ), decomposition rate constant of the decomposition reaction, and the rate constant of the reaction were determined. NMR results confirmed that the higher storage capacity of HCHO in [MIM][HSO 4 ] and [IM][HSO 4 ] is mostly attributed to the stronger covalent bonds between the ionic liquids (ILs) and HCHO. CONCLUSION These ILs are, thus, promising candidates as adsorbents for the design of air depollution processes. This study may provide new insights into the use of ILs for storage of HCHO for low-cost, high-performance, and environmentally benign adsorbents for indoor air purification. © 2022 Society of Chemical Industry (SCI).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 11
·1299
·
IF 4.501
Yidi Zhou,Xin Min,Lijuan Wang,Yajing Zhao,Bozhi Yang,Xiaoxian Wu,Dan Zhang,Xifeng Hou,Yan’gai Liu,Minghao Fang,Zhaohui Huang
The critical need to enhance the quality of indoor air leads to the improvement of catalyst activity for the removal of formaldehyde. Sepiolite can be utilized in catalytic reactions for its unique structure, composition and high surface area. The adhesion between sepiolite fibers and the blocked microporous channel (by impurities) demands the activation of natural sepiolite through acid treatment. This treatment successfully produces acid-modified sepiolite Pt-supported samples. The impacts of different acid concentrations, Pt loading content and calcination temperature on catalytic activity for formaldehyde (HCHO) oxidation are studied. The catalytic activity of HCHO is characterized and evaluated by techniques including specific surface area, X-ray diffraction, Fourier transform infrared spectrum, X-ray photoelectron spectroscopy and transmission electron microscopy. The results show the maximum specific area of sepiolite at the optimized 0.06 M acid concentration. Among all the prepared samples, the 0.02Pt/Sep catalyst calcined at 500 °C exhibits the highest catalytic activity for the oxidation of HCHO.Keywords:HCHO;sepiolite;acid-modified;Pt nanoparticles
研究领域:
环境科学
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催化化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2026
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IF 5.2
Juntong Meng,Yongshuo Zhang,Xiongfei Du,Wei Zhang,Tiantian Li,Xinya Wang,Mingxing Chen
Formaldehyde (HCHO), a hazardous volatile organic compound (VOC) in indoor environments, urgently requires efficient abatement strategies. MnO2 is renowned for its excellent catalytic activity and enables effective degradation of HCHO at low temperatures. In this study, MnO2 nanorods (NRs) were successfully grown on polypropylene (PP) nonwoven fabric via hydrothermal synthesis, yielding MnO2 NRs @ PP composite material with integrated HCHO removal, antibacterial, and photocatalytic functions. pH value and temperature critically regulated MnO2 morphology. Increasing pH raised the aspect ratio of MnO2 NRs, which transitioned to MnO2 nanoparticles (NPs) when the pH value was above pH 3.5. Higher temperatures promoted MnO2 NRs formation, yet beyond 150 °C, excessive refinement led to MnO2 NRs agglomeration and partial PP fiber melting. Optimal performance was achieved at pH 3.5 and 150 °C, where the composite exhibited a high HCHO removal efficiency of 55.1% along with notable antibacterial and photocatalytic properties. This work provides a feasible synthesis strategy for multifunctional composites that can be applied in indoor air purification and environmental remediation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Shengnan Guan,Qifu Huang,Jianru Ma,Wenzhi Li,Ajibola T. Ogunbiyi,Zean Zhou,Kun Chen,Qi Zhang
The catalytic performance of MnO2(x)–CeO2 (x = Mn/Ce molar ratio) and the synergistic effect have been investigated in formaldehyde removal. The results showed that formaldehyde achieved 100% conversion at 60 °C for MnO2(1.5)–CeO2, with the gas hourly space velocity = 120 000 mL h–1 gcat–1. It was lower than the formaldehyde removal temperature of MnO2 (130 °C) and CeO2 (170 °C). The apparent activation energy for HCHO oxidation with MnO2(1.5)–CeO2 was 34.2 kJ mol–1. The partial mutual replacement of Mnx+ and Cex+ decreases the crystallite size due to the MnO2/CeO2 interaction. The X-ray photoelectron spectroscopy and the Raman analyses show that the Mn3+/Mn and Oads/Olatt ratios and the relative concentrations of oxygen vacancies for MnO2(1)–CeO2 and MnO2(1.5)–CeO2 were higher than those of the rest of the catalysts. Thus, the lattice oxygen (Olatt) from CeO2 readily transfers to the oxygen vacancy, achieving Olatt activation to surface-adsorbed oxygen (Oads).
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
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2010
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IF 4.224
Zhengjun Wang,Jie Liu,Feijiu Wang,Siya Chen,Hui Luo,Xibin Yu
Uniform and monodisperse ZnSnO3 cubic crystallites were prepared via a solution process involving the reaction of zinc sulfate and sodium stannate at a reaction temperature as low as 0 °C without any surfactant. The size was readily controlled from 40 to 600 nm by varying the reaction temperature. The possible formation mechanism of cubic crystallites was attributed to a nucleation assembly process. The as-fabricated sensors based on ZnSnO3 cubic crystallites showed high sensitivity, fast response, and short recovery times toward HCHO gas. And as the particle-size of ZnSnO3 cubic crystallites decrease, the sensitivity of gas sensors based on them increases and the recovery time shorten rapidly. The detection limit of ZnSnO3 cubic crystallites sensor can reach as little as lower than one per million for HCHO. The performance of a home-built ZnSnO3 cubic crystallites sensor was even better than the competing SnO2 and In2O3 sensor, making this material interesting for sensor devices.
研究领域:
材料科学
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纳米技术
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传感器
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2019
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IF 3.674
Feng Wang,GuoQin Qi,ChuanQi Zhang,HeCheng Ren,Hua Ma,Yu Guo
A series of Na-doped Pt/Al 2 O 3 catalysts with 0.2 wt% of Pt loading and 0–6 wt% Na loading was prepared to investigate the HCHO complete oxidation at room temperature. Powder XRD, BET and XPS were used to characterize the bulk structure and texture of catalysts, as well as the ratio of hydroxyl oxygen to lattice oxygen. A long-term catalyst stability test (50 h on reaction stream) was conducted under severe conditions of a large space velocity of 180,000 mL/h/g, a high HCHO concentration of 80 ppm and dry conditions (relative humidity of 0%). An appropriate amount of doped-Na (2 wt%) contributed to a remarkable improvement of activity and stability of the Na-doped 0.2 wt% Pt/Al 2 O 3 catalyst.
研究领域:
催化化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Wei Zhang,XiaoLi Cheng,Xianfa Zhang,Yingming Xu,Shan Gao,Hui Zhao,Lihua Huo
Distinctive mesoporous SnO 2 microtubes were synthesized via a facile and environmentally friendly solvothermal method. The gas sensor based on such SnO 2 microtubes exhibited not only the lower detection limit to detect formaldehyde and remarkable selectivity comparison with other various gases when operating within 92 °C, but also good linear relationship under concentration ranges of ppm level (1–100 ppm) and ppb level (10–100 ppb). The sensing properties of such SnO 2 microtubes have been greatly improved compared to previously reported hollow structures. This might be attributed to their large specific surface area and porous structure, which can promote the diffusion of gas molecules and their adsorption on the surface of the sensing material.
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
AICHE JOURNAL
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2022
·Vol. 69
·期 3
·e17895
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IF 4.167
Xuyu Wang,Fu Yang,Jianjian Yi,Jiejing Kong,Juanjuan Gong,Aihua Yuan,Zebao Rui,Hongbing Ji
Rational engineering of noble metal/transition metal bimetallic catalysts is considered as an effective way to constructing synergistic effect between adsorbed oxygen and hydroxyl for enhanced catalytic formaldehyde oxidation. Herein, we developed a Pt–Ni bimetallic catalysts loading on γ-Al 2 O 3 support for room-temperature formaldehyde oxidation. Catalytic experiment results showed that the conversion rate was >97% with a >100 h stability. Several noble metals (Pd, Au, and Ag) were compared to identify the activity effect in formaldehyde oxidation. The activity and stability test in different atmospheres and in situ infrared test suggested that the PtNi/γ-Al 2 O 3 has the best activity and stability. At a meantime, the results also demonstrated that Pt sites motivate more surface adsorbed oxygen through activating ambient oxygen molecules, while the neighboring Ni atoms contribute to adsorbed hydroxyl, thereby offering sustainable activity. The high efficiency and stability of PtNi/γ-Al 2 O 3 catalysts for formaldehyde oxidation could be a promising candidate for air purification.
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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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2017
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IF 2.813
Honggen Peng,Jiawei Ying,Jingyan Zhang,Xianhua Zhang,Cheng Peng,Cheng Rao,Wenming Liu,Ning Zhang,Xiang Wang
Catalytic oxidation of formaldehyde (HCHO) is the most efficient way to purify indoor air of HCHO pollutant. This work investigated rare earth La-doped Pt/TiO 2 for low concentration HCHO oxidation at room temperature . La-doped Pt/TiO 2 had a dramatically promoted catalytic performance for HCHO oxidation. The reasons for the La promotion effect were investigated by N 2 adsorption, X-ray diffraction, CO chemisorption , X-ray photoelectron spectroscopy, transmission electron microscopy (TEM) and high-angle annular dark field scanning TEM . The Pt nanoparticle size was reduced to 1.7 nm from 2.2 nm after modification by La, which led to higher Pt dispersion, more exposed active sites and enhanced metal-support interaction. Thus a superior activity for indoor low concentration HCHO oxidation was obtained. Moreover, the La-doped TiO 2 can be wash-coated on a cordierite monolith so that very low amounts of Pt (0.01 wt%) can be used. The catalyst was evaluated in a simulated indoor HCHO elimination environment and displayed high purifying efficiency and stability. It can be potentially used as a commercial catalyst for indoor HCHO elimination.
研究领域:
环境催化
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材料化学
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纳米科学
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大气污染控制
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表面化学
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多相催化
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zujiang Liu,Xuehua Yuan,Tianhao Chen,Chongqing Yu,Luyan Xiong,Zhixuan Zeng,Zeyu Pan,Gnanasekar Sathishkumar,Jing Li,Jin Ye,En-Tang Kang,Liqun Xu,Xi Rao
The escalating levels of indoor bacterial contamination and air pollution considerably threaten public health. In this work, we synthesized a three-dimensional flower-like TiO 2 /g-C 3 N 4 nano-powder with a Z-scheme heterojunction structure, which demonstrated superior photocatalytic performance and efficient free radical generation capability, enabling effective mitigation of bacterial pathogens and indoor volatile organic compounds under low-power light irradiation. The material achieved 100% degradation of formaldehyde within 40 minutes under 420 nm LED irradiation. Antibacterial tests showed a 100% inactivation rate for S. aureus within 60 minutes and complete elimination of E. coli within 40 minutes. Characterizations and DFT calculations had confirmed the establishment of the Z-scheme heterojunction, which significantly decreased the band gap and improves the absorption of visible light. Concurrently, the efficient separation of charge carriers and the transfer of electrons facilitated the production of reactive oxygen species. In conclusion, this research presents a novel and environmentally sustainable approach to developing high-performance photocatalysts for applications in indoor environment improvement.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yiheng Li,Tao Dong,Pingli Huang,Jian Ji,Haibao Huang
Airborne formaldehyde (HCHO) in indoor environments causes serious health problems and needs to be efficiently eliminated. However, the efficient and stable catalytic oxidation of HCHO can be hardly achieved at room temperature over transition metal oxides due to the limited exposure of active sites. Herein, δ-MnO 2 @GO catalysts were originally synthesized via a facile in situ growth of δ-MnO 2 on the trace graphene oxide (GO) substrate (1%) and stably exhibited nearly 100% HCHO elimination at room temperature. δ-MnO 2 @GO showed the unique 2D coralloid structure with uniformly dispersed δ-MnO 2 nanorod on planar-structured GO, which greatly enhanced the exposure of catalytic sites and mass transfer of reactants. The abundant surface reactive oxygen species (ROS) and hydroxyl (-OH) groups were rapidly generated from the activation of O 2 and surface-adsorbed water over highly exposed catalytic sites. The ROS and -OH groups cooperated well cooperated to maintain the exceptional catalytic activity and stability towards HCHO degradation. In-situ DRIFTS results showed that catalytic HCHO oxidation predominantly follows the Langmuir-Hinshelwood (L-H) mechanism over the δ-MnO 2 @GO. This study presents a simple yet effective strategy for maximizing exposure to catalytic active sites and rational design of efficient catalysts for indoor HCHO elimination.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Da Xu,Feng Sun,Hong Shao,Feng Liu,Qianli Ma,Wensheng Yu,Feng Li,Xiangting Dong
Metal oxide semiconductors (MOSs) are widely utilized in the gas-sensing field owing to their superior gas sensing performances. Herein, a hierarchical nanostructure consisting of Bi 2 MoO 6 nanosheets (NSs) assembled on LaFeO 3 nanofibers (NFs) was successfully synthesized by combining an electrospinning with a solvothermal method . The full study of the sensing performances was conducted by manufacturing commercial gas sensors based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure in order to showcase its potential application in gas sensing. The results show that the sensor based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure exhibits excellent HCHO gas sensing performances including a high response (R a /R g = 36.5), a superior selectivity and a short recovery time (τ rec = 20 s). Additionally, sensors based on Bi 2 MoO 6 NSs and LaFeO 3 NFs were also respectively fabricated to measure HCHO gas sensing performances in order to elucidate the sensing mechanism and structural superiority of the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The increased capability of detecting HCHO gas can be attributed to the n-p heterostructure formed within the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The findings in this work can contribute to the realization to enhance the sensing performances by designing n-p heterostructure in gas sensing material.
研究领域:
材料科学
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传感器技术
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纳米技术
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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）