SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Xiaolong Han,Hexiang Sun,Liangliang Liu,Yuqi Wang,Gaohong He,Jiding Li
Incorporation of MOF particles into polymer matrix is an effective approach to prepare mixed matrix membranes (MMMs) with high selectivity and high permeability for pervaporation. In this article, regularly distributed CPO-Z7-Ni particles filled polydimethylsiloxane (PDMS) MMMs were prepared and used for pervaporation desulfurization. Benefiting from well-defined pore structures, high surface area, good compatibility with PDMS matrix and excellent thiophene adsorption capacity of the prepared CPO-27-Ni particles, both total flux and sulfur enrichment factor of the CPO-27-Ni/PDMS MMMs were remarkably increased. When the loading of CPO-27-Ni was 6 wt%, the optimal pervaporation performance was achieved with a flux of 5.92 kg/(m 2 ·h) and an enrichment factor of 4.05. These increased by 68.7% and 23.7% versus pristine PDMS membrane, respectively. It is proved that the incorporation of CPO-27-Ni particles into PDMS matrix can overcome the “trade-off” phenomenon between flux and sulfur enrichment factor, which is very important for pervaporation desulfurization.
研究领域:
材料科学
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化学工程
✓ 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
Jin Yan,Shengnan Lu,Yonghou Xiao,Qidong Zhao,Boxing An,Yi Pan,Gaohong He
High-efficiency removal of macromolecular aromatic sulfide from fuel via adsorption technology remains a challenge due to the limited mass-transfer efficiency in traditional microporous materials. Constructing hierarchically porous structure might be an alternative route to overcome the problem. Herein, we propose an approach to prepare rationally defective Nickel(II) 2,5-dihydroxyterephthalate (CPO-27-Ni) using benzoic acid (BA) and 2, 5-dihydroxyterephthalic acid (DHTA) as mixed ligands, aiming at reducing the diffusion resistance of molecules in adsorbents through introducing mesopores and thus enhancing the performance of aromatic sulfide removal. By adjusting the ratio of BA and DHTA ( x ), CPO-27-Ni (BA-C- x ) with rational defects was successfully synthesized. Compared with the single-channel CPO-27-Ni, the penetrating sulfur capacity in the dynamic adsorption experiment was increased by 9.97 times for thiophene (TP), 7.25 times for benzothiophene (BT) and 2.81 times for dibenzothiophene (DBT). After the addition of organic ligand B, additional mesoporous pores were formed in the microporous CPO-27-Ni. The obtained hierarchical structure possessed better textural properties and ensured structural constancy, which improved the utilization rate of high active sites and mass transfer rate of adsorbent, leading to promoted desulfurization performance. The reported method of introducing mesopores into MOFs to construct hierarchically porous structures would provide a meaningful reference for facile preparation of high-efficiency desulfurization adsorbents.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Shengnan Lu,Yonghou Xiao,Qidong Zhao,Wenkai Zhao,Gaohong He
Deep desulfurization from fuel has gradually become a research hotspot with enhancing requirements of environmental protection. CPO-27-Ni was considered as one of promising adsorbents towards adsorption desulfurization by virtue of its prodigious high pore volume and high specific surface area. However, the dominant microporous channels in traditional CPO-27-Ni hinder the diffusion of thiophene sulfide and its derivatives with relatively large molecular size, which limits its desulfurization efficiency. Herein, we proposed a strategy to reasonably construct defective CPO-27-Ni with micro-mesoporous structure using N , N -dimethyloctadecylamine (DMA18) as a template, aim at improving the diffusion efficiency by introducing meso -pores. Different amounts of DMA18 were introduced to synthesize defective CPO-27-Ni (DMA18-C- X ) by solvothermal method, and DMA18-C-0.5 (the mole ratio of added DMA18 to Ni 2+ was 0.5) exhibited a satisfactory desulfurization performance. The dynamic breakthrough adsorption capacities of dibenzothiophene, benzothiophene and thiophene over the DMA18-C-0.5 were remarkably promoted, which were as high 3.79, 6.45 and 9.29 times as the traditional CPO-27-Ni, respectively. The crystal structure of CPO-27-Ni was not altered after adding template agent DMA18, while a uniform distribution of mesopores appeared. The largest mesopore attained a size of 2.8 nm, which effectively promoted the full exposure of more unsaturated Ni 2+ active sites and enhanced the interaction between Ni 2+ active sites and sulfides, resulting in strengthened adsorption desulfurization performance. This method of introducing proper defects to construct mesopores in MOFs provides some useful references for preparing high-efficiency desulfurization adsorbents.
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
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Chengcheng Huang,Zipeng Zhao,Enming Ping,Lijuan Zhang,Yunshan Zhou,Libo Qin
The Ag@CPO-27-Ni composites were deliberately synthesized with different loading amounts of silver nano-particles in CPO-27-Ni which features unsaturated metal sites and cylindrical one-dimensional channels having a diameter of ca. 11 Å constructed by 2,5-dihydroxybenzene-1,4-dicarboxylate and Ni 2+ by a simple one-pot solvothermal method. The well-characterized composites were used as adsorbents to eliminate the aromatic S-compounds of the model oil and fluid catalytic cracking (FCC) oil at room temperature. The experimental results showed that the adsorptive desulfurization followed pseudo-second order reaction kinetics and the adsorptive desulfurization capacity of Ag@CPO-27-Ni (wherein Ag is 1.23 wt%) was notably enhanced as compared with CPO-27-Ni under the same experimental conditions. Impressively, 35 ppmw S dibenzothiophene (DBT) (or benzothiophene (BT))-containing model oil (20 g) was desulfurized to 2.01 ± 0.27 (or 4.05 ± 0.26) ppmw S by using 0.2 (or 0.5) g of the composite, respectively; the composite showed much higher selectivity factor of adsorbing DBT to naphthalene than CPO-27-Ni. The notable enhancement in adsorptive desulfurization performance is thought to be due to the interactions between Ag particles and sulfur or π-system of thiophene moiety in the S-containing compounds that consequently promote selective attraction between S-containing compounds and the composite. Besides, the composite also showed satisfactory recyclability.
研究领域:
材料科学
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环境化学
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催化
✓ 已验证
产品关联
DOI
高影响因子
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