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Liu B, Yu M, Verma S, Kim KH. Anti-competitive adsorption of gaseous benzene on hydrophilic microporous carbon in humid conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:171998. [PMID: 38537821 DOI: 10.1016/j.scitotenv.2024.171998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/17/2024] [Accepted: 03/24/2024] [Indexed: 04/14/2024]
Abstract
The adsorption capture of ambient volatile organic compounds (VOCs) is of practical importance for air quality management. Herein, unique anti-competitive adsorption behavior of benzene on a hydrophilic activated carbon (Procarb-900 (P900)) is evidenced in the presence of competing components (e.g., formaldehyde (FA) and/or moisture). Contrary to general expectations, the adsorption capacity of 10 Pa benzene (QB) onto P900 (30 mg) at the 99 % breakthrough level improves from 144.8 to 187 mg g-1 as the relative humidity (RH) increases from 0 to 25 %. Such pattern is maintained at 183.9 mg g-1 even at the relatively high RH of 50 %. Furthermore, QB exhibits a remarkable increase of 56.1 % (to 226.0 mg g-1) in the binary phase (100 ppm benzene plus 50 ppm FA) relative to its single phase (144.8 mg g-1). The kinetic studies confirm the occurrence of anti-competitive adsorption of benzene under humid conditions with the unusual decrease in rate constants at the elevated RHs (i.e., 25 and 50 %). The thermodynamic studies suggest the exothermic nature of benzene adsorption onto P900. The hydrophilicity of P900's outer surface promotes the preferential adsorption of polar FA and water vapor over non-polar benzene, which deforms the activated carbon texture and lowers the pore size distribution (PSD). The narrow PSD enhances benzene uptake in the complex systems due to the confinement effect. Overall, this study offers insights into the unique anti-competitive adsorption of non-polar VOCs (e.g., benzene) on hydrophilic microporous adsorbents in the presence of potential interferences such as polar water vapor and FA. These findings offer a guideline for the practical implementation of adsorption techniques for gaseous VOCs in humid conditions.
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Affiliation(s)
- Botao Liu
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China; Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Mingshen Yu
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Swati Verma
- Department of Civil and Environmental 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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Tian H, Zheng Z, Pang X, Lan S, Han Z, Liang Z, Sun D. A novel method for production of nitrogen fertilizer with low energy consumption by efficiently adsorbing and separating waste ammonia. ENVIRONMENTAL RESEARCH 2024; 247:118245. [PMID: 38244966 DOI: 10.1016/j.envres.2024.118245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 01/14/2024] [Accepted: 01/17/2024] [Indexed: 01/22/2024]
Abstract
Recovering waste NH3 to be used as a source of nitrogen fertilizer or liquid fuel has recently attracted much attention. Current methods mainly utilize activated carbon or metal-organic frameworks to capture NH3, but are limited due to low NH3 adsorption capacity and high cost, respectively. In this study, novel porous materials that are low cost and easy to synthesize were prepared as NH3 adsorbents by precipitation polymerization with acid optimization. The results showed that adsorption sites (‒COOH, -OH, and lactone) which form chemical adsorption or hydrogen bonds with NH3 were successfully regulated by response surface methods. Correspondingly, the dynamic NH3 adsorption capacity increased from 5.45 mg g-1 to 129 mg g-1, which is higher than most known activated carbon and metal-organic frameworks. Separation performance tests showed that NH3 could also be separated from CO2 and CH4. The findings in this study will advance the industrialization of NH3 polymer adsorbents and provide technical support for the recycling of waste NH3.
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Affiliation(s)
- Haozhong Tian
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China; Beijing Key Lab for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science & Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Zhenkun Zheng
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Xiaobing Pang
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.
| | - Senchen Lan
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Zhangliang Han
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China; Beijing Key Lab for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science & Engineering, Beijing Forestry University, Beijing, 100083, China; Shaoxing Research Institute, Zhejing University of Technology, Shaoxing, 312000, China.
| | - Zhirong Liang
- Zhongfa Aviation Institute of Beihang University, Hangzhou, China, 310023, China
| | - Dezhi Sun
- Beijing Key Lab for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science & Engineering, Beijing Forestry University, Beijing, 100083, China.
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Abbas M, Maceda AM, Xiao Z, Zhou HC, Balkus KJ. Transformation of a copper-based metal-organic polyhedron into a mixed linker MOF for CO 2 capture. Dalton Trans 2023; 52:4415-4422. [PMID: 36916445 DOI: 10.1039/d2dt04162f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
A new mixed linker metal-organic framework (MOF) has been synthesized from a copper-based metal-organic polyhedron (MOP-1) and 2,2'-bipyridine (2,2'-bipy). The CuMOF-Bipy with a formula of [Cu2(2,2'-bpy)2(m-BDC)2]n is comprised of a binuclear Cu(II) node coordinated to 2,2'-bipy, and isophthalic acid (m-BDC), which bridges to neighboring nodes. The crystal structure of CuMOF-Bipy consists of a stacked two-dimensional framework with the sql topology. CuMOF-Bipy was characterized by single-crystal X-ray diffraction (SC-XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and CO2 sorption. CuMOF-Bipy was shown to have one-dimensional sinusoidal channels that allow diffusion of CO2 but not N2.
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Affiliation(s)
- Muhammad Abbas
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX 75080, USA
| | - Amanda M Maceda
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX 75080, USA
| | - Zhifeng Xiao
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
| | - Hong-Cai Zhou
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
| | - Kenneth J Balkus
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX 75080, USA
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The co-adsorption potential of metal-organic framework/activated carbon composites against both polar and non-polar volatile organic compounds in air. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Han Z, Mao Y, Pang X, Yan Y. Structure and functional group regulation of plastics for efficient ammonia capture. JOURNAL OF HAZARDOUS MATERIALS 2022; 440:129789. [PMID: 36007365 DOI: 10.1016/j.jhazmat.2022.129789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 07/04/2022] [Accepted: 08/14/2022] [Indexed: 06/15/2023]
Abstract
Activated carbon and metal organic frameworks have been tested as NH3 recovery adsorbents, however, they are limited due to low NH3 adsorption capacity and high cost, respectively. In this study, ethylene glycol dimethacrylate (EGDMA) polymers as the representative ester plastics were tested, and their structure and adsorption sites were regulated using HNO3, HCl, or H2SO4 with varied H+ concentrations. The results showed that the EGDMA polymers all used hydrolysis which promoted NH3 adsorption via different mechanisms. With HNO3 and HCl optimization, an increased surface area promoted NH3 adsorption via physical forces. H2SO4 optimization resulted in -COOH, -OH, and -SO3H formation, which reacted with NH3 by chemical adsorption and hydrogen bonds. This significantly increased the NH3 adsorption capacity (85.99 mg·g-1) compared to the material before optimization (0.36 mg·g-1). This study presents a novel low-cost and efficient method to recycle waste plastics as NH3 adsorbents.
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Affiliation(s)
- Zhangliang Han
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China; Shaoxing Research Institute, Zhejing University of Technology, Shaoxing 312000, China
| | - Yiping Mao
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaobing Pang
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
| | - Yubo Yan
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
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