RSC Advances
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2023
·Vol. 13
·期 23
·15934-15941
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IF 3.9
Xiaoping Chen,Xianfei Wang,Wei Liu,Hui Tian,Yupeng Du,Haisheng Wei,Linsheng Tang
1-Butene, as one of the widely used chemical raw materials, can be produced by the double bond isomerization of 2-butene. However, the current yield of the isomerization reaction is only up to 20% or so. It is therefore an urgent issue to develop novel catalysts with higher performances. In this work, a high-activity ZrO2@C catalyst that is derived from UiO-66(Zr) is fabricated. The catalyst is prepared by calcining the precursor UiO-66(Zr) at high temperature in nitrogen, and characterized by XRD, TG, BET, SEM/TEM, XPS and NH3-TPD. The results demonstrate that the calcination temperature has significant influences on the catalyst structure and performance. Regarding the catalyst ZrO2@C-500, the selectivity and yield of 1-butene are 94.0% and 35.1%, respectively. The high performance is due to multiple aspects, including the inherited octahedral morphology from parent UiO-66(Zr), suitable medium-strong acidic active sites and high surface area. The present work will lead to a better understanding of the ZrO2@C catalyst and guide the rational design of high-activity catalysts for the double bond isomerization of 2-butene to 1-butene.
研究领域:
化学工程
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催化材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Mingmin Jia,Yi Feng,Shichang Liu,Jianhao Qiu,Jianfeng Yao
UiO-66-NH 2 were either intercalated into graphene oxide (GO) layers (GOU@S) or covered by GO layers (GO/U@S) to form UiO-66-NH 2 /GO composite membrane . Results show that different synthesis methods would lead to different membrane morphology, thickness and gas separation performance. For GOU@S membrane, UiO-66-NH 2 was well-dispersed and intercalated into GO layer, whereas two continuous layers (GO and UiO-66 layer) with an obvious boundary were observed for GO/U@S. Due to the morphology and structure difference, better hydrogen separation performance was achieved for GOU@S membrane compared to GO/U@S membrane and pristine membrane due to the close interfacial contact between UiO-66-NH 2 and GO, which arises from the hydrogen bonding formed between -NH 2 group in UiO-66-NH 2 and -OH group in GO and the electrostatic force between UiO-66-NH 2 and GO layers. The ideal selectivities of H 2 /N 2 and H 2 /CO 2 were increased to 9.75 and 6.35, respectively, for the GOU@S membrane with a H 2 permeance of 3.9 × 10 −8 mol m −2 s −1 Pa −1 .
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4426-4437
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IF 3.741
Fangyan Cui,Wenyi Wang,Caini Liu,Xingyu Chen,Ning Li
Summary One-dimensional (1D) sodium ligninsulfonate functionalized carbon nanotubes (SCNT), two-dimensional (2D) graphene oxide (GO), and three-dimensional (3D) zirconium-based metal-organic frameworks (UiO-66) are self-assembled as filler materials for proton-exchange membranes (PEMs) because of their potential for extending proton transport pathways. Herein, UiO-66-SCNT and UiO-66-SCNT@GO were prepared by a facile solvothermal synthesis and then the nanohybrid chitosan (CS) PEMs were fabricated via solution casting. The hybrid PEMs with higher ion exchange capacity than the pure CS membrane displayed higher proton conductivity and selectivity. The proton conductivity of nanohybrid membrane doped with 7 wt% UiO-66-SCNT@GO (CS/U-S@GO-7) was enhanced to 64 mS cm −1 at 70°C. Simultaneously, the selectivity was reached 19.4 × 10 4 S s cm −3 and was much higher than the pristine CS membrane (0.13 × 10 3 S s cm −3 ). Moreover, the mechanical properties of all composite membranes were significantly enhanced compared with that of the pure CS membrane. The results showed that our research provided a valuable strategy for designing high-performance CS-based PEMs in direct methanol fuel cell (DMFC). Highlights A simple and facile solvothermal synthesis was used to prepare UiO-66-SCNT@GO. UiO-66-SCNT@GO was introduced into chitosan (CS) matrix to optimize proton transport channels. CS-based hybrid membranes exhibit high proton conductivity and selectivity. CS-based hybrid membranes show low methanol permeability.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Xifei Zhou,Sijia Liu,Changqing Yang,Junxian Qin,Yun Hu
The worldwide environmental pollution and energy crisis have become two main challenges currently. To this end, we aim to build a win–win strategy of clean hydrogen energy recovery with simultaneous environmental detoxification by treating sulfide-containing wastewater in a non-hazardous manner. In this study, we designed a heterostructure photocatalyst with in situ growth of MnCdS nanoparticles on thiol-functionalized UiO-66-based materials (UiOS-MCS). A series of characterization analyses showed that UiOS-MCS nanocomposites held favorable properties of efficient charge separation and migration, which thanked to well-matched band structure and tight interfacial contacts via thiol-linked bonds that greatly facilitated the transfer of photogenerated charge carriers. The optimal nanocomposite of 0.5UiOS-MCS exhibited excellent photocatalytic activity under visible light irradiation, with an impressive hydrogen evolution of 3179.36 μmol g −1 h −1 and a significant removal of sulfide contaminants in the wastewater of about 90%, selectively generating valuable oxidation product of monomeric sulfur. The mechanism analysis demonstrated that the main photoactive species required for hydrogen production by photoreduction (electrons) and sulfide removal by photooxidation (holes) were independent of each other, and that the electron-hole division of collaboration ensured an efficient and synergistic redox reaction. This work offers a promising strategy for the recovery of energy stored in wastewater and environmental remediation.
研究领域:
环境科学
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能源科学
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材料科学
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DOI
高影响因子
CHEMICAL PHYSICS
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2021
·
IF 2.348
Xingchang Tang,Yongwei Luo,Zhijian Zhang,Wanwu Ding,Dexue Liu,Jingchuan Wang,Li Guo,Ming Wen
The high surface areas and tunable properties of Zr-based MOFs make them as attractive materials for gas capture, storage, and separation. In this work, UiO-66, one kinds of Zr-based MOFs, functionalized by single or binary –NO 2 and –NH 2 groups are synthesized. Water adsorption ability and hydrophilicity of UiO-66 and functionalized UiO-66-X were investigated. It is found that surface area of UiO-66 is decreased after introducing functional groups, while hydrophilicity of UiO-66 increased after functionalized with –NO 2 and –NH 2 . Therefore, after balance the effects of surface area and hydrophilicity, UiO-66-NH 2 shows the best water adsorption propriety.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Jialin Niu,Yulong Xiang,Xiaoli Dong,Yu Wang,Nan Zheng,Pei Yu
Hexavalent chromium in industrial wastewater poses a serious threat to ecosystems. Photocatalytic technology has been seen as a promising strategy for removing heavy metal ions. Construction of heterostructures offered a promising strategy to enhance the separation efficiency of photogenerated carriers, thereby improving photocatalytic performance. Herein, ZnWO 4 /UiO-66-NH 2 heterostructures were synthesized by a two-step hydrothermal method. The synthesized samples were systematically characterized via a variety of techniques, alongside an exploration of the associated photocatalytic mechanism. ZnWO 4 /UiO-66-NH 2 -2 exhibited an exceptional photocatalytic performance, attaining a 97 % degradation of hexavalent chromium within 60 min, approximately 1.3 and 4.7 times that of UiO-66-NH 2 and ZnWO 4 , respectively. The transient photocurrent response, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) results indicate that constructing heterostructures can effectively accelerate the migration of electrons while simultaneously suppressing the recombination process of photogenerated carriers. In addition, Active species trapping experiments revealed that the photogenerated electrons were the main active substances in photoreduction reaction. This study offers an effective strategy for photocatalytic reduction of hexavalent chromium.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Shubo Wang,Yuan Lin,Jian Yang,Lei Shi,Guang Yang,Xupin Zhuang,Zhenhuan Li
Metal–organic frameworks (MOFs) exhibit high proton conductivity , thermal stability, and offer immense flexibility in terms of tailoring their size. Owing to their unique characteristics, they are desirable candidates for proton conductors . Nevertheless, constructing ordered MOF proton channels in proton exchange membranes (PEMs) remains a formidable challenge. Herein, blend nanofibers of cellulose and UiO-66-NH 2 (Cell–UiO-66-NH 2 ) obtained via the electrospinning process were embedded in a sulfonated polysulfone matrix to obtain high-performance composite PEMs with an orderly arrangement of UiO-66-NH 2 . Comprehensive characterization and membrane performance tests reveal that composite membrane with 5 wt% (nominal) UiO-66-NH 2 have revealed high proton conductivity of 0.196 S cm −1 at 80 °C and 100% relative humidity. Meantime, the composite membrane exhibits a low methanol permeability coefficient (~5.5 × 10 −7 cm 2 s −1 ). Moreover, the composite membrane exhibits a low swelling ratio (17.3%) even at 80 °C. The Cell–UiO-66-NH 2 nanofibers exhibit strong potential for use as a proton-conducting nanofiller in fuel-cell PEMs.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2021
·Vol. 327
·期 2
·811-819
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IF 1.371
Du Ziyao,Li Bolin,Jiang Chao,Sun Ruopei,Chen Suwen
A metal–organic framework, UiO-66-NH 2 , was designed, synthesized and characterized in this study. By conducting solvothermal method, Salicylaldehyde (Sal) and 2,4-dihydroxybenzaldehyde (MHBA) were grafted onto UiO-66-NH 2 via post-treatment to obtain the functionalized material UiO-66-Sal and UiO-66-MHBA. The three materials above were characterized, and the effects of solid–liquid ratio, pH, ionic strength, and oscillation time on U(VI) adsorption were studied. The relevant experimental results fitted well with pseudo-second-order kinetic equation and thermodynamic adsorption model.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Shenglong Tian,Zede Yi,Junqing Chen,Shiyu Fu
The capture of radioactive iodine is an inevitable requirement in nuclear industry for environmental protection. Metal-organic frameworks (MOFs) are a new generation of sorbents that have wide applications for iodine adsorption and recovery. Although the loading of MOFs on wood can avoid the drawbacks of the powder form of MOFs in implementation, the dense structure of wood results in the lower loading, even after delignification, which limits the adsorption capacity. Herein, a hierarchically porous UiO-66-NH 2 @WCA composite was fabricated by in-situ synthesis of UiO-66-NH 2 in wood-derived cellulose aerogel (WCA) that was further removed hemicellulose from delignified wood. UiO-66-NH 2 @WCA exhibited a high loading (36 wt%) of UiO-66-NH 2 crystals and a high adsorption capacity of 704 mg/g for iodine vapor and 248 mg/g for iodine aqueous solution. The adsorption behavior in iodine aqueous solution was well predicted by the Freundlich isotherm and pseudo-second-order kinetic model. The adsorption capacity of UiO-66-NH 2 @WCA was highest in solution when the pH was 6, while the ionic strength had little effect. The hydroxyl groups on the WCA matrix had a charge transfer effect with iodine, providing additional sites for iodine capture . Furthermore, a packed column system was applied to demonstrate the excellent recyclability and potential for practical application.
研究领域:
材料科学
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环境科学
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核工业
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DOI
PubMed
高影响因子
Small Methods
·
2025
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IF 9.1
Ziwen Li,Xiaolong Fang,Yao Yao,Ganggang Chang,Hongjian Xu,Li Mei,Chao Liu,Ge Tian,Xiaoyu Yang
In recent years, the controllable synthesis of hierarchically porous metal–organic frameworks (HP-MOFs) has received significant attention. However, most synthesized HP-MOFs are primarily adjusted in terms of second-order porosity, and the simultaneous control of mesopore and macropore sizes in HP-MOFs remains difficult to attain. Herein, for the first time, HP-UiO-66-NH 2 is successfully synthesized with simultaneously controllable macro-, meso-, and micropores (MMM-UiO-66-NH 2 ) by combining the hard template methods and the water-acid competitive nucleation strategy. Impressively, the innovative introduction of a water-acid system can effectively slow down the dissolution of polystyrene (PS) microspheres, ultimately achieving simultaneous regulation of macropore sizes in the range of 160–400 nm and mesopore sizes in the range of 3.9–10.3 nm. Meanwhile, this method can be extended to other UiO-66 series. The hierarchically macro-, meso-, and microporous structure provides sufficient accessibility to substrate molecules and enables rapid mass transfer, contributing to the highest Knoevenagel condensation reaction performance. Furthermore, the MMM-UiO-66-NH 2 is used as an anchoring carrier to bind the bulky phosphomolybdic acid (PMA) through the strong host-guest interaction, endowing it with excellent catalytic oxidative desulfurization (ODS) performance. This study has developed an effective synthetic strategy for preparing HP-MOFs and further expanded the application of HP-MOFs in macromolecular-related catalysis.
研究领域:
材料化学
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纳米催化
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多孔材料
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配位聚合物
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环境催化
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 3
·1757-1768
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IF 3.119
Yiqiu Liu,Yi Zhou,Qijun Tang,Qian Li,Si Chen,Zhuxing Sun,Haiqiang Wang
To explore an efficient photocatalyst for NO pollution, a direct Z-scheme photocatalytic system is successfully fabricated by coupling Bi2WO6 with NH2-UiO-66 via a simple hydrothermal synthesis technique. The Z-scheme system promotes the NO photocatalytic oxidation activity with an optimum NO removal rate of 79%, which is 2.7 and 1.2 times that obtained by using only pristine Bi2WO6 and NH2-UiO-66, respectively. Simultaneously, superior selectivity for converting NO to NO3−/NO2− is observed. The enhanced photocatalytic performance of the Bi2WO6/NH2-UiO-66 hybrids is attributed to the following two aspects: (i) large specific area of NH2-UiO-66, which exposes more active sites and is beneficial to the adsorption and activation of NO; (ii) outstanding Z-scheme structure constructed between BiWO6 and NH2-UiO-66, which can improve the efficiency of the separation of electron–hole pairs and preserves the strong oxidation ability of hybrids. ESR analysis shows that ·O2− and ·OH contribute to NO removal. A possible photocatalytic mechanism of NO oxidation on the direct Z-scheme photocatalyst (BWO/2NU) under visible light irradiation is proposed. This work displays the BWO/2NU hybrid's potential for treating low-concentration air pollutants, and the proposed Z-scheme photocatalyst design and promotion mechanism may inspire more rational synthesis of highly efficient photocatalysts for NO removal.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 42
·22859-22867
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IF 11.9
Jinhong Yang,Haoran Peng,Chong Lin,Qingjiang Pan,Lixue Qi,Li Li,Keying Shi
To overcome the drawbacks of low sensitivity and limited selectivity exhibited by metal oxide sensitive materials, a metal–organic framework (MOF) derived composite (marked as UZZ) was constructed via a combined wet chemical method. UiO-66 was used as the precursor with the introduction of ZnO. The ZrO2 component in UZZ retains the unique octahedral configuration of UiO-66; on its folded surface, a large number of ZnO particles grow, whose sizes range from 20 to 40 nm. The composite exhibits excellent gas sensitivity to NO2 at room temperature. Exemplarily, the gas sensitive response to 100 ppm NO2 is 40.35, with a response time of 1.4 s and a detection limit as low as the 50 ppb level, and the stability is up to 8 weeks. The presence of numerous oxygen vacancies and n–n type heterojunctions on the surface of the UZZ composite synergistically enhances the gas-sensing performance. This finding provides a significant reference for developing new efficient and high-sensitivity metal oxide sensitive materials based on MOFs.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）