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Duan C, Meng M, Huang H, Wang H, Ding H, Zhang Q. Adsorptivity and kinetics for low concentration of gaseous formaldehyde on bamboo-based activated carbon loaded with ammonium acetate particles. ENVIRONMENTAL RESEARCH 2023; 222:115364. [PMID: 36736757 DOI: 10.1016/j.envres.2023.115364] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 01/13/2023] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
The highly promising formaldehyde (HCHO)-removing materials are essential for eliminating interior pollution to safeguard the public's health with increasing indoor HCHO contamination situations being recorded on a global scale. In the paper, bamboo charcoal (BC) was activated with boric acid to prepare bamboo-based activated carbon (BAC), and then impregnated with ammonium acetate solution to successfully develop porous adsorbent with ammonium acetate particles (N/BAC), which was applied to remove low concentration of HCHO at room temperature. The adsorption performance for HCHO was systematically investigated while the surface chemical properties and microstructure of the as-prepared adsorbents were described and analyzed. The specific surface area, total pore volume and microporous volume of N/BAC sample were 240.09 m2/g, 0.27 cm3/g and 0.12 cm3/g, which increased by 42.40 m2/g, 0.15 cm3/g and 0.03 cm3/g compared with BAC sample, respectively. The specific surface area and the microporous volume, as well as the content of oxygen- and nitrogen-containing functional groups of N/BAC sample were augmented by contrast with other samples, and numerous ammonium acetate particles were present on the surface. Precisely because of this, the N/BAC sample exhibited a high removal rate of 98.89%, which was 18.38% greater than that of BAC sample. A superior correlation coefficient (0.9999) from the experimental values of the kinetics and the fitted values of the pseudo-second-order kinetic model demonstrated that the adsorption process of HCHO on N/BAC sample was physical-chemical combined adsorption. The adsorption of HCHO on N/BAC sample was investigated under different humidity, and the results showed that the adsorbent yet had excellent adsorption capacity (87.93%) under RH 75%. Moreover, the N/BAC sample was renewable, and the removal rate still reached 82.81% after five cycles of regeneration. Therefore, the as-prepared adsorbent is an effective, economical and sustainable material, and could be used to remove HCHO from real contaminated indoor air.
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Affiliation(s)
- Chaomin Duan
- College of Environment and Resources, Guangxi Normal University, Guilin, 541004, China
| | - Mianwu Meng
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, China, Guilin, 541004, China; College of Environment and Resources, Guangxi Normal University, Guilin, 541004, China.
| | - Huang Huang
- Guilin Huayue Entech Limited Company, Guilin, Guangxi, 541805, China.
| | - Heng Wang
- Guilin Huayue Entech Limited Company, Guilin, Guangxi, 541805, China.
| | - Hua Ding
- College of Environment and Resources, Guangxi Normal University, Guilin, 541004, China
| | - Qi Zhang
- College of Environment and Resources, Guangxi Normal University, Guilin, 541004, China
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Mahdi HI, Ramlee NN, Santos DHDS, Giannakoudakis DA, de Oliveira LH, Selvasembian R, Azelee NIW, Bazargan A, Meili L. Formaldehyde production using methanol and heterogeneous solid catalysts: A comprehensive review. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.112944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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3
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Yu J, Ye S, Xv X, Pan L, Lin P, Liao H, Wang D. Thermal-Driven Formation of Silver Clusters Inside Na/Li FAUY Zeolites for Formaldehyde Detection. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12183215. [PMID: 36145003 PMCID: PMC9503286 DOI: 10.3390/nano12183215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 09/01/2022] [Accepted: 09/13/2022] [Indexed: 06/01/2023]
Abstract
In this research, the LiY zeolite was firstly synthesized by using NaY as the parent zeolite; thereafter, the LiYAg and NaYAg zeolites created for formaldehyde gas detection were prepared with further Ag+-Li+/Na+ exchange and a mild thermal treatment at 300 °C to promote the formation of luminescent Ag CLs. The spectra experimental results indicated that Ag CLs showed stronger and blue-shifted emissions in LiYAg compared with in NaYAg, and the emission intensity of Ag CLs in both zeolites monotonously decreased when exposed to increasing formaldehyde gas content. Moreover, the linear dependence of the Ag CLs' emission intensity variation on formaldehyde content indicated a reliable method for fast and sensitive formaldehyde detection. According to the XPS, UV-vis absorption, and N2 adsorption-desorption isotherm studies, the formaldehyde-gas-induced luminescence quenching of Ag CLs is due to the formation of Ag2O and Ag NPs, in which the higher content of Ag+/Ag0 redox couples in LiYAg and larger surface area of NaYAg benefit the precise detection of formaldehyde gas in low- and high-content ranges, respectively. Furthermore, the blue-shifted peak position and widened FWHM of Ag CLs can also be used for the indication of formaldehyde gas and the detection limit of NaYAg and LiYAg, which both meet with the standards of the WHO and OSHA.
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4
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Li J, Zhang B, Shu Y. Simulation of gas-solid adsorption process considering particle-size distribution. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.02.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Adsorption of silver nano-particles modified activated carbon filter media for indoor formaldehyde removal. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137864] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Gong W, Zhang L, Yu Y, Lin B, Wang Y, Cao Y, Guo M. Modification of Cu
3
(BTC)
2
with Cobalt Ion for Adsorption and Visualized Detection of Formaldehyde Gas. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wenpeng Gong
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Li Zhang
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Ying Yu
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Bixia Lin
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Yumin Wang
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Yujuan Cao
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
| | - Manli Guo
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSouth China Normal University Guangzhou 510006 P.R. China
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7
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Zhang D, Zhang M, Ding F, Liu W, Zhang L, Cui L. Efficient removal of formaldehyde by polyethyleneimine modified activated carbon in a fixed bed. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:18109-18116. [PMID: 32172419 DOI: 10.1007/s11356-020-08019-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 02/06/2020] [Indexed: 06/10/2023]
Abstract
Polyethyleneimine modified activated carbon (PEI-AC) was prepared through a treatment of immersion, and used for the adsorption of formaldehyde. The adsorption capacity of formaldehyde by unmodified AC is 190.1 mg g-1, and the adsorption capacity of formaldehyde can reach to 317.6 mg g-1 after 10 g L-1 of PEI modified, being about 1.67 times than unmodified activated carbon (AC: 191.2 mg g-1). And the 10 g L-1 of PEI modified AC (PAC-30) has the highest adsorption capacity of formaldehyde, reached to 650 mg g-1, with an increasing magnitude of 240% in comparison with that without modified AC. This is mainly due to changes in the pore structure and surface functional groups after modification. However, as the PEI concentration increases, the adsorption performance is inhibited. Through kinetic studies, it was found that all adsorption curves follow the second-order kinetics, and the breakthrough curves follow the Boltzmann model, and the adsorption process can also be described by the intraparticle diffusion model.
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Affiliation(s)
- Dongdong Zhang
- College of Resources and Environmental Science, South-central University for Nationalities, Wuhan, 430072, China
| | - Mengxi Zhang
- College of Resources and Environmental Science, South-central University for Nationalities, Wuhan, 430072, China
| | - Feng Ding
- Hubei Academy of Environmental Sciences, Wuhan, 430074, China
| | - Wei Liu
- Hubei Academy of Environmental Sciences, Wuhan, 430074, China
| | - Long Zhang
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Longzhe Cui
- College of Resources and Environmental Science, South-central University for Nationalities, Wuhan, 430072, China.
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8
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Na CJ, Yoo MJ, Tsang DCW, Kim HW, Kim KH. High-performance materials for effective sorptive removal of formaldehyde in air. JOURNAL OF HAZARDOUS MATERIALS 2019; 366:452-465. [PMID: 30562657 DOI: 10.1016/j.jhazmat.2018.12.011] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/13/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
As formaldehyde (FA) is well-known for its carcinogenic potential, various techniques for its removal have been developed based on recovery (e.g., adsorption/absorption and condensation) or destructive treatment (e.g., incineration and thermal/ catalytic oxidation). Among them, adsorption has been one of the most preferable options due to its low price and simplicity. In this review, we summarize state-of-the-art knowledge about adsorption mechanisms with respect to its key controlling variables (e.g., surface chemical properties of adsorbent, temperature, and relative humidity) and adsorption performance of materials with particular emphasis on advanced materials (e.g., carbon nanotubes, metal-organic frameworks, graphene oxides, and porous organic polymers) and their modified forms in comparison with conventional sorbents (e.g., AC and zeolite). However, it is yet difficult to assess the adsorption capacity of each material on a parallel basis because adsorption experiments of each material were conducted under different conditions (e.g., large differences in the initial loading concentrations). The partition coefficient (PC) was employed for evaluating adsorption performance between different materials at an equivalent level to overcome the limitation based on adsorption capacity concept. For instance, among the list of the surveyed materials, the highest PC was recorded by γ-CD-MOF-K (31.2 mol kg-1 Pa-1). This study should offer valuable insights into the selection and development of outstanding materials for the sorptive removal of FA.
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Affiliation(s)
- Chae-Jin Na
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul, 04763, Republic of Korea
| | - Mi-Ji Yoo
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul, 04763, Republic of Korea
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Hyoun Woo Kim
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seoul, 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul, 04763, Republic of Korea.
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9
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Zhang W, Chen L, Xu L, Dong H, Hu H, Xiao Y, Zheng M, Liu Y, Liang Y. Advanced nanonetwork-structured carbon materials for high-performance formaldehyde capture. J Colloid Interface Sci 2018; 537:562-568. [PMID: 30472635 DOI: 10.1016/j.jcis.2018.11.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 11/01/2018] [Accepted: 11/12/2018] [Indexed: 11/25/2022]
Abstract
Facile design and construction of advanced materials for eliminating the indoor formaldehyde pollution is still a great challenge but very desirable to provide clean air for human life. Herein, we report a high-performance formaldehyde adsorbent, i.e., a new type of nanonetwork-structured carbon (NNSC) with a hollow nanosphere as network unit by developing a facile, efficient and post-treatment-free strategy. The NNSCs can be easily obtained by a simple carbonization of a mixture, in which natural wheat husk and Teflon are used as carbon precursor and biotemplate-in-situ-remover, respectively. The as-constructed NNSC exhibits a unique three-dimensional interconnected micro-, meso- and macroporous nanonetwork. Benefiting from such a valuable hollow nanosphere-interconnected network structure, the NNSCs show surprising formaldehyde gas adsorption properties including super-high storage capacity, ultrafast adsorption rate and efficient adsorptively active surface. Remarkably, their specific adsorption capacity and maximum adsorption rate are as high as 120.3 mg g-1 m-3 and 44.6 mg g-1 m-3 h-1, which make 18-fold and 41-fold enhancement when compared to activated carbon commercially used for formaldehyde adsorption, respectively. This work highlights an efficient solution to develop high-performance formaldehyde adsorbents by facile and rational construction of novel porous structure, simultaneously to provide a new avenue to high-value advanced materials for challenging environmental issue.
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Affiliation(s)
- Weicai Zhang
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Lidong Chen
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Linhe Xu
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Hanwu Dong
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Hang Hu
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Yong Xiao
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Mingtao Zheng
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Yingliang Liu
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Yeru Liang
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
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10
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Hu SC, Chen YC, Lin XZ, Shiue A, Huang PH, Chen YC, Chang SM, Tseng CH, Zhou B. Characterization and adsorption capacity of potassium permanganate used to modify activated carbon filter media for indoor formaldehyde removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:28525-28545. [PMID: 30091073 DOI: 10.1007/s11356-018-2681-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
This study examined the effect of potassium permanganate (KMnO4)-modified activated carbon for formaldehyde removal under different face velocities and different initial formaldehyde concentrations in building environment. We chose the coconut shell activated carbon due to their high density and purity. Moreover, they have a clear environmental advantage over coal-based carbons, particularly in terms of acidification potential. The chemical properties were characterized by FTIR to show the functional groups, EDS to calculate each component of their energy bands to know how the ratio is. Also, the morphology of the surface was examined with scanning electron microscopy (SEM). The BET determines specific surface area, pore size, and pore volume. It was found that where the initial formaldehyde concentration and the face velocity are low, adsorption capacity is high. The adsorption isotherms of formaldehyde on modified activated carbon are well fitted by both Langmuir and Freundlich equations. The rate parameter for the pseudo-first-order model, pseudo-second-order model, and intraparticle diffusion model was compared. The correlation coefficient of pseudo-second-order kinetic model (0.999 > R2 > 0.9548) is higher than the coefficient of pseudo-first-order kinetic model (0.5785 < R2 < 0.8755) and intraparticle diffusion model (0.9752 < R2 < 0.9898). Thus, pseudo-second-order kinetic model is more apposite to discuss the adsorption kinetic in this test, and the overall rate of the modified activated carbon adsorption process appears to be influenced by more than one step that is both the intraparticle diffusion model and membrane diffusion.
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Affiliation(s)
- Shih-Cheng Hu
- Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung Hsiao E Road, Taipei, 10608, Taiwan, Republic of China
| | - Ying-Chen Chen
- Department of Molecular Science and Technology, National Taipei University of Technology, Taipei, Taiwan, Republic of China
| | - Xin-Zhi Lin
- Department of HVAC, College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Angus Shiue
- Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung Hsiao E Road, Taipei, 10608, Taiwan, Republic of China.
| | - Po-Hua Huang
- Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei, Taiwan, Republic of China
| | - Yen-Che Chen
- Department of Molecular Science and Technology, National Taipei University of Technology, Taipei, Taiwan, Republic of China
| | - Shu-Mei Chang
- Department of Molecular Science and Technology, National Taipei University of Technology, Taipei, Taiwan, Republic of China
| | - Chao-Heng Tseng
- Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei, Taiwan, Republic of China
| | - Bin Zhou
- Department of HVAC, College of Urban Construction, Nanjing Tech University, Nanjing, China
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11
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de Falco G, Barczak M, Montagnaro F, Bandosz TJ. A New Generation of Surface Active Carbon Textiles As Reactive Adsorbents of Indoor Formaldehyde. ACS APPLIED MATERIALS & INTERFACES 2018; 10:8066-8076. [PMID: 29461794 DOI: 10.1021/acsami.7b19519] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Highly porous carbon textiles were modified by impregnation with urea, thiourea, dicyandiamide, or penicillin G, followed by heat treatment at 800 °C. This resulted in an incorporation of nitrogen or nitrogen and sulfur heteroatoms in various configurations to the carbon surface. The volume of pores and, especially, ultramicropores was also affected to various extents. The modified textiles were then used as adsorbents of formaldehyde (1 ppmv) in dynamic conditions. The modifications applied significantly improved the adsorptive performance. For the majority of samples, formaldehyde adsorption resulted in a decrease in the volume of ultramicropores. The enhancement in the adsorption was linked not only to the physical adsorption of formaldehyde in small pores but also to its reactivity with sulfonic groups and amines present on the surface. Water on the surface and in challenge gas decreased the adsorptive performance owing to the competition with formaldehyde for polar centers. The results collected show that the S- and N-modified textiles can work as efficient media for indoor formaldehyde removal.
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Affiliation(s)
- Giacomo de Falco
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
- Institute of Research on Combustion, National Research Council, IRC-CNR , Piazzale Vincenzo Tecchio 80 , 80125 Napoli , Italy
- Department of Chemical Sciences , University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo , 80126 Napoli , Italy
| | - Mariusz Barczak
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
- Faculty of Chemistry , Maria Curie-Sklodowska University , Maria Curie-Sklodowska Sq. 3 , 20-031 Lublin , Poland
| | - Fabio Montagnaro
- Department of Chemical Sciences , University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo , 80126 Napoli , Italy
| | - Teresa J Bandosz
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
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12
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Synthesis and catalytic activity of Ag nanoparticles dispersed on nitrogen-doped GOPx toward direct electrooxidation of formaldehyde. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Xiao R, Mo J, Zhang Y, Gao D. An in-situ thermally regenerated air purifier for indoor formaldehyde removal. INDOOR AIR 2018; 28:266-275. [PMID: 29168902 DOI: 10.1111/ina.12441] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 11/14/2017] [Indexed: 06/07/2023]
Abstract
Formaldehyde is a common indoor pollutant that is an irritant and has been classified as carcinogen to humans. Adsorption technology is safe and stable and removes formaldehyde efficiently, but its short life span and low adsorption capacity limit its indoor application. To overcome these limitations, we propose an in-situ thermally regenerated air purifier (TRAP) which self-regenerates as needed. This purifier has four working modes: cleaning mode, regeneration mode, exhaust mode, and outdoor air in-take mode, all of which are operated by valve switching. We developed a real-scale TRAP prototype with activated carbon as adsorbent. The experimental testing showed that the regeneration ratios for formaldehyde of TRAP were greater than 90% during 5 cycles of adsorption-regeneration and that through the 5 cycles, there was no damage to the adsorption material as confirmed by scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET) tests. The total energy consumption by the prototype for purifying 1000 m3 indoor air was 0.26 kWh. This in-situ thermal-regeneration method can recover the purifier's adsorption ability through at least five cycles.
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Affiliation(s)
- R Xiao
- Department of Building Science, Tsinghua University, Beijing, China
- Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing, China
| | - J Mo
- Department of Building Science, Tsinghua University, Beijing, China
- Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing, China
| | - Y Zhang
- Department of Building Science, Tsinghua University, Beijing, China
- Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing, China
| | - D Gao
- Department of Building Science, Tsinghua University, Beijing, China
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14
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AbdEl-Salam A, Ewais H, Basaleh A. Silver nanoparticles immobilised on the activated carbon as efficient adsorbent for removal of crystal violet dye from aqueous solutions. A kinetic study. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.109] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Zhao Y, Low ZX, Feng S, Zhong Z, Wang Y, Yao Z. Multifunctional hybrid porous filters with hierarchical structures for simultaneous removal of indoor VOCs, dusts and microorganisms. NANOSCALE 2017; 9:5433-5444. [PMID: 28230878 DOI: 10.1039/c6nr09779k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Air purification often requires multiple layers of filters with different functions to remove various air pollutants, which lead to high pressure drop, high air flow path and frequent filter replacement. In this work, a novel multifunctional Ag@MWCNTs/Al2O3 hybrid filter with a depth-type hierarchical structure for simultaneous removal of fine particles, microorganisms and VOCs was designed and fabricated. The novel hybrid air filter showed leading air purification performances to date, achieving 82.24% degradation of formaldehyde at room temperature, 99.99% formaldehyde degradation at 55 °C and complete retention of indoor airborne microorganisms. The complete particle retention rate (100% retention) based on the most penetrating particle size (MPPS, aerodynamic diameter ≦300 nm) of Ag@MWCNTs/Al2O3 was achieved at an only 35.60% pressure drop compared with the pristine Al2O3 filter, leading to the highest quality factor (Qf) ever reported. Furthermore, the Ag@MWCNTs/Al2O3 hybrid filter showed excellent water repellency (water contact angle of 139.6 ± 2.9°), prolonging the service life of the filters and improving the air purification efficiency. The novel Ag@MWCNTs/Al2O3 hybrid filter exhibits remarkable air purification performance in both laboratory synthetic conditions as well as in the "real world" and shows great promise as an effective single replacement for multiple layers of air purifying filters.
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Affiliation(s)
- Yang Zhao
- State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China.
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Duan Y, Song S, Cheng B, Yu J, Jiang C. Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(16)62551-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Kalita NK, Ganguli JN. Hibiscus sabdariffa L. leaf extract mediated green synthesis of silver nanoparticles and its use in catalytic reduction of 4-nitrophenol. INORG NANO-MET CHEM 2016. [DOI: 10.1080/15533174.2016.1218506] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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18
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Comparison of 2-amino benzyl alcohol adsorption onto activated carbon, silicon carbide nanoparticle and silicon carbide nanoparticle loaded on activated carbon. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Zengin H, Kalayci G, Zengin G. Effect of Sonication in the Preparation of Activated Carbon Particles on Adsorption Performance. SEP SCI TECHNOL 2014. [DOI: 10.1080/01496395.2014.902383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Ayanda OS, Fatoki OS, Adekola FA, Ximba BJ. Utilization of nSiO2, fly ash, and nSiO 2/fly ash composite for the remediation of triphenyltin (TPT) from contaminated seawater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:8172-8181. [PMID: 23649603 DOI: 10.1007/s11356-013-1775-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Accepted: 04/24/2013] [Indexed: 06/02/2023]
Abstract
The removal of triphenyltin chloride from contaminated simulated seawater with adsorption method was discussed. The adsorbents used are fly ash, nSiO2, and nSiO2/fly ash composite. The results showed that the adsorption of the adsorbents increases with increase in the adsorbent dose, contact time, pH, stirring speed, initial TPT concentration, and decreased with increase in temperature. The adsorption fitted well with the Freundlich isotherm, showing that the adsorbent and TPT combined with function groups and the adsorption kinetics followed the pseudo-second-order kinetic model. The thermodynamic parameters were also evaluated. Optimal conditions for the adsorption of TPT from simulated seawater were applied to TPT removal from natural seawater. A higher removal efficiency of TPT (>99%) was obtained for the nSiO2/fly ash composite but not for fly ash and nSiO2.
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Affiliation(s)
- Olushola S Ayanda
- Department of Chemistry, Faculty of Applied Sciences, Cape Peninsula University of Technology, P.O. Box 1906, Bellville, South Africa,
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Nanostructural Features of Silver Nanoparticles Powder Synthesized through Concurrent Formation of the Nanosized Particles of Both Starch and Silver. JOURNAL OF NANOTECHNOLOGY 2013. [DOI: 10.1155/2013/201057] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Green innovative strategy was developed to accomplish silver nanoparticles formation of starch-silver nanoparticles (St-AgNPs) in the powder form. Thus, St-AgNPs were synthesized through concurrent formation of the nanosized particles of both starch and silver. The alkali dissolved starch acts as reducing agent for silver ions and as stabilizing agent for the formed AgNPs. The chemical reduction process occurred in water bath under high-speed homogenizer. After completion of the reaction, the colloidal solution of AgNPs coated with alkali dissolved starch was cooled and precipitated using ethanol. The powder precipitate was collected by centrifugation, then washed, and dried; St-AgNPs powder was characterized using state-of-the-art facilities including UV-vis spectroscopy, Transmission Electron Microscopy (TEM), particle size analyzer (PS), Polydispersity index (PdI), Zeta potential (ZP), XRD, FT-IR, EDX, and TGA. TEM and XRD indicate that the average size of pure AgNPs does not exceed 20 nm with spherical shape and high concentration of AgNPs (30000 ppm). The results obtained from TGA indicates that the higher thermal stability of starch coated AgNPS than that of starch nanoparticles alone. In addition to the data obtained from EDX which reveals the presence of AgNPs and the data obtained from particle size analyzer and zeta potential determination indicate that the good uniformity and the highly stability of St-AgNPs).
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Fulazzaky MA, Talaiekhozani A, Hadibarata T. Calculation of optimal gas retention time using a logarithmic equation applied to a bio-trickling filter reactor for formaldehyde removal from synthetic contaminated air. RSC Adv 2013. [DOI: 10.1039/c3ra22753g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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