INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ye Zhang,Zhongyi Jiang,Jing Song,Jian Song,Fusheng Pan,Peng Zhang,Xingzhong Cao
Polymeric dense membranes for separating molecules with similar properties in liquid mixture according to solution-diffusion mechanisms are often constrained by trade-off effects. Integrating a facilitated transport mechanism and a sieving mechanism into membranes is a preferred approach to address this issue. Herein, amine-functionalized titanium-based metal–organic frameworks (NH2-MIL-125(Ti)) immobilized with Ag+, Ag+@NH2-MIL-125(Ti), was synthesized and hybrid membranes were fabricated for pervaporative desulfurization. The immobilized Ag+ can form reversible π-complexation toward thiophene and achieve thiophene-selectivity transport via a facilitated transport mechanism; meanwhile, Ag+ can decrease the effective pore size of the MOFs to elevate the diffusion selectivity of thiophene via a sieving mechanism. Accordingly, the resulting Pebax membranes with 1.0 wt % Ag+@NH2-MIL-125(Ti) exhibit a permeation flux of 22.11 kg/(m2 h) and an enrichment factor of 5.92. Furthermore, the hybrid membranes display increased thermostability and antiswelling properties by the incorporation of Ag+@NH2-MIL-125(Ti). This study proposes a strategy for the rational design of MOFs as nanofillers and endow the membranes with superior separation performance by integrating multiple transport mechanisms.
研究领域:
材料科学
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分离技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
He Ding,Fusheng Pan,Ena Mulalic,Hassan Gomaa,Weidong Li,Hao Yang,Hong Wu,Zhongyi Jiang,Baoyi Wang,Xingzhong Cao,Peng Zhang
In this study, Cu + and Fe 2+ ions were co-impregnated onto carbon nitride nanosheets via polydopamine chelating, and then incorporated into a Pebax matrix to fabricate the facilitated transport hybrid membranes. The homogeneously dispersed nanosheets disturb the packing of Pebax chains and render the hybrid membrane an appropriate free volume property. The existence of stabilizer Fe 2+ on Cu + Fe 2+ @CNs prevents the disproportionation and oxidation of Cu + , which is an efficient facilitated transport carrier for thiophene via π-complexation in gasoline desulfurization. Accordingly, the hybrid membranes exhibit superior desulfurization performance along with good stability even at high operation temperature. Especially, when the content of Cu + Fe 2+ @CNs is 5 wt%, the membrane achieves the optimum desulfurization performance with a permeation flux of 13.42 kg/(m 2 h) (18.76% higher than that of pure Pebax membrane) and an enrichment factor of 7.11 (28.80% higher than that of pure Pebax membrane) under 60 °C for octane-thiophene model gasoline with thiophene content of 1312 ppm. Besides, the membrane shows good stability in the long-term desulfurization under high operation temperature of 60 °C for 10 days and keeps the stability of incorporated Cu + for six months. The study offers a facile approach to enhance the carrier stability in high-performance facilitated transport membranes.
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
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 3
·475-483
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IF 3.146
Lv Xia,Li Xueqin,Huang Lu,Ding Siyuan,Lv Yin,Zhang Jinli
Pebax® MH 1657 (Pebax)-based blend membranes with different polyether-amine (PEA) loadings were designed and fabricated for efficient CO 2 separation. The CO 2 separation performance of Pebax/PEA blend membranes was greatly improved in comparison with that of pure membranes. This was mainly because the introduced PEA tailored the physical and chemical microenvironments in blend membranes. Specifically, PEA was a liquid-like additive, which was beneficial to reduce the mass transfer resistance of gases and increase CO 2 permeability. Meanwhile, PEA contained amino groups that acted as mobile carriers to tailor the chemical microenvironment in blend membranes. The mobile carriers preferentially reacted reversibly with CO 2 molecules, facilitating CO 2 transport in membranes. Compared with CO 2 /CH 4 separation performance of pure Pebax membrane, CO 2 permeability and CO 2 /CH 4 separation factor of Pebax/PEA-3 increased by 144.8% and 29.4%, respectively. This study suggests that PEA is a promising membrane material for tailoring the physical and chemical microenvironments in blend membranes for efficient CO 2 separation.
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
JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
Dongdong Peng,Shaofei Wang,Zhizhang Tian,Xingyu Wu,Yingzhen Wu,Hong Wu,Qingping Xin,Jianfeng Chen,Xingzhong Cao,Zhongyi Jiang
In this study, a novel kind of facilitated transport membrane was prepared by incorporating zinc ion-modified graphene (GO-DA-Zn 2+ ) nanosheets into a poly(ether-block-amide) (Pebax) matrix. Graphene oxide (GO) nanosheets were modified with zinc ion (Zn 2+ ) by using dopamine-mediated complexation reaction. The CO 2 separation properties of the facilitated transport membrane were evaluated using CO 2 /CH 4 mixture as model system. The GO-DA-Zn 2+ nanosheets played an important role in enhancing membrane performance. First, the high zinc ion loading (34.2 wt% of the nanosheets) could enhance the facilitated transport of CO 2 based on π-complexation mechanism, leading to a higher CO 2 permeability and selectivity. Second, the incorporation of graphene nanosheets with high aspect ratio rendered more tortuous gas transport channels, which was favorable for hindering the penetration of CH 4 with larger molecular size and thus enhancing the CO 2 /CH 4 selectivity. Third, the fractional free volume of hybrid membrane was much elevated, also leading to higher CO 2 permeability. The optimum separation properties of GO-DA-Zn 2+ incorporated Pebax membranes were achieved with a CO 2 permeability of 137.9 Barrer and a CO 2 /CH 4 selectivity of 30.6, which were 49% and 78% higher than those of pristine Pebax membrane.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2015
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IF 5.056
Yifan Li,Xueqin Li,Hong Wu,Qingping Xin,Shaofei Wang,Ye Liu,Zhizhang Tian,Tiantian Zhou,Zhongyi Jiang,Hongwei Tian,Xingzhong Cao,Baoyi Wang
Calcium lignosulfonate (CaLS) is an organic anionic surfactant , which has been used for the first time as a charged additive to improve the performance of Pebax membranes for CO 2 separation. Owing to the abundant hydrophobic groups and low charge density of lignosulfonate ion (LS 2− ), CaLS was found to efficiently interrupt the chain packing of Pebax 1657 matrix via both metal-organic complexation and hydrophobic interaction, endowing membranes with tunable fractional free volume (FFV). For dry membranes, CaLS could slightly enlarge membrane FFV without forming highly crosslinked structures. For humidified membranes, water-induced swelling led to a remarkable enhancement of FFV, while the hydrophobic interaction between CaLS and Pebax avoided excessive swelling. With the coexistence of CaLS and water, optimal FFV and moderate salting-out effect were acquired, resulting in very high CO 2 permeability (3585 Barrer) and fairly good CO 2 /gas selectivity (29 for CO 2 /CH 4 and 71 for CO 2 /N 2 ). The separation mechanism was discussed by analyzing the relationship between salting-out effect and the well-known solution-diffusion mechanism. Based on the performance comparison of Pebax–CaLS membrane with the previously reported Pebax–salt membranes, the guideline about the design of polymer electrolyte membranes for CO 2 capture was tentatively proposed.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
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