ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Huazhen Sun,Beibei Tang,Peiyi Wu
Metal–organic frameworks (MOFs) are being intensively explored as filler materials for polymeric proton exchange membranes (PEMs) due to their potentials for the systematic design and modification of proton-conducting properties. S-UiO-66, a stable MOF with functional groups of −SO3H in its ligands, was selected here to prepare S-UiO-66@graphene oxide (GO) hybrid nanosheets via a facile in situ growth procedure, and then a series of composite PEMs were prepared by hybridizing S-UiO-66@GO and sulfonated poly(ether ether ketone) (SPEEK). The resultant hybrid nanosheets not only possessed abundant −SO3H groups derived from the ligands of S-UiO-66 but also yielded a uniform dispersion of S-UiO-66 onto GO nanosheets, thus effectively eliminating the agglomeration of S-UiO-66 in the membrane matrix. Thanks to the well-tailored chemical composition and nanostructure of S-UiO-66@GO, the as-prepared SPEEK/S-UiO-66@GO composite PEMs present a significant increase in their proton conductivity under various conditions. In particular, the proton conductivity of the SPEEK/S-UiO-66@GO-10 membrane was up to 0.268 S·cm–1 and 16.57 mS·cm–1 at 70 °C-95% RH and 100 °C-40% RH (2.6 and 6.0 times that of recast SPEEK under the same condition), respectively. Moreover, the mechanical property of composite membranes was substantially strengthened and the methanol penetration was well-suppressed. Our investigation indicates the great potential of S-UiO-66@GO in fabricating composite PEMs and also reveals that the high proton conductivity of MOFs can be fully utilized by means of MOF/polymer composite membranes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Ruimeng Wang,Long Liu,Sidra Subhan,Yaseen Muhammad,Yang Hu,Meiyun Huang,Yi Peng,Zhongxing Zhao,Zhenxia Zhao
The pH-switchable UiO-66 were engineered via in-situ amino acids (AA) doping for the highly selective adsorption of anionic dyes (i.e. sunset yellow FCF (SY)). Three AA doped samples, i.e. UiO-66-V (valine), UiO-66-T (threonine), and UiO-66-Y (tyrosine), have fabricated hierarchical structure and endowed –NH 2 surface in framework structure concurrently. These AA doped UiO-66s awarded highly selective adsorption and fast diffusivity towards the mentioned anionic dyes. More interestingly, enriched –NH 2 groups endowed AA doped UiO-66s a significant pH-responsive character for selectivity of anionic/cationic dyes. Textural characterization and adsorption measurement confirmed that high surface areas (>1070 m 2 /g) with defected pores and –NH 2 surface significantly enhanced adsorption uptake (352.8 mg/g) and diffusion rate (168 × 10 −3 min −1 ) for SY on AA doped UiO-66s, about 1.9 and 5.9 times respectively as that on pristine UiO-66. The AA doped UiO-66s exhibited one order of magnitude higher selectivity (>390) for SY against MB than that of original UiO-66. More importantly, the alteration in surface charge (–NH 2 H + ⇌ O H - -NH 3 + ) endorsed a great variation in the selectivity of AA doped UiO-66s to dyes when adjusting pH from 4 to 8, showing an excellent pH on-off switchable property. Also, it realized a stable self-adsorption/desorption recycling process via pH-switching for 6 consecutive cycles. With these features, the pH-switchable defected UiO-66 realized highly efficiency adsorption and non-thermal separation/regeneration process for anionic dyes.
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CHEMOSPHERE
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2021
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IF 7.086
Dongxue Liu,Ye Li,Chang Liu,Yuzhi Zhou
A nanocomposite of a zirconium-based metal-organic framework (UiO-66) @ polypyrrole (PPy) (UiO-66@PPy) was successfully synthesized to eliminate F − from groundwater. The optimum initial pH and adsorbent dose for maximum uptake of F − from aqueous solution were found to be 3.0 and 0.1 g/L, respectively. The fluoride removal performance of UiO-66 was greatly enhanced through the introduction of polypyrrole guests, and the maximum adsorption capacity of UiO-66@PPy, namely, 290.7 mg/g, was reached, which is far superior to those of other previously reported adsorbents. The fluoride adsorption by UiO-66@PPy agreed well with the pseudo-second-order equation model and Langmuir isotherm model. The coexisting PO 4 3− and CO 3 2− substantially influence fluoride removal. The synthesized UiO-66@PPy could be reused five times in adsorption-desorption cycles. The incorporation of conducting polymers opened additional paths for the development of adsorbent materials; thus, UiO-66@PPy could be a viable adsorbent material and contribute to fluoride removal from groundwater.
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高影响因子
TOPICS IN CATALYSIS
·
2025
·
IF 3
Guan Yueyue,Zeng Xianglong,Liu Shuming,Yao Kai,Hu Zhenhui,Xiao Longhao,Fang Zheng,Yang Yongsheng,Liu Hongjun
To address the issue of limited degradation efficiency due to rapid carrier recombination in piezoelectric catalysis, this study designed a ternary heterojunction structure of ZnO/CuO@UiO-66-NH 2 . A ZnO/CuO heterointerface was constructed on the surface of UiO-66-NH 2 via a hydrothermal method, forming a composite piezoelectric catalytic system with abundant active sites and enhanced built-in electric fields. Theoretical analysis indicated that UiO-66-NH 2 , as a carrier, not only significantly increased the specific surface area of the material but also cooperatively regulated the charge distribution in the heterojunction region. Under ultrasonic vibration, the piezoelectric potential generated by the ZnO/CuO heterojunction effectively drove carrier separation, thereby significantly enhancing the redox reaction efficiency. Under dark conditions, the 30-minute degradation rate of RhB by this material reached 99.7%, with a rate constant of 0.09435 min⁻¹, far superior to the pure ZnO/CuO system. Additionally, ZnO/CuO@UiO-66-NH 2 demonstrated excellent catalytic performance and cycling stability in the degradation of methyl orange and methylene blue. Band structure and radical trapping experiments confirmed that hydrogen radicals (·H) and superoxide radicals (·O 2 ⁻) were the main active species in the degradation process. This research provides new material ideas for the development of efficient and stable heterojunction piezoelectric catalysts and offers potential pathways for the construction of integrated systems for dye wastewater treatment and energy conversion. Graphical
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高影响因子
JOM
·
2025
·
IF 2.3
Du Boyu,Qi Xianjin,Li Yongkui,Pan Hongyan,Lei Wenya,Yan Kai
In this paper, UiO-66-NH 2 was synthesized by a solvothermal method. Two defects were induced by the introduction of an acid modifier and an iron source during synthesis. The effect of the acid modifier on the degree of defects and adsorption properties of the material was investigated by adjusting the type of acid modifier. The results showed that the addition of Fe and benzoic acid yielded the largest specific surface area in UiO-66-NH 2 with abundant defect structures. This enabled Fe-UiO-66-NH 2 -BA to achieve 78.83% arsenic removal within 60 s. The adsorption process followed pseudo-second kinetics and the Langmuir isothermal model. Notably, the adsorption capacity of Fe-UiO-66-NH 2 -BA for arsenic in wastewater at pH 11 (2010 mg/g) was superior to those of most of the reported MOF adsorbents. The excellent arsenic adsorption capacity can be attributed to the formation of free Lewis acid sites and ligand complexation by MOF deletion linkage defects, and the adsorbent can still maintain > 80% adsorption capacity after five cycles of regeneration. In conclusion, Fe-UiO-66-NH 2 -BA, as an efficient adsorbent for efficient capture of arsenic from wastewater, provides a new concept for water purification technology.
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Applied Materials Today
·
2025
·
IF 6.9
Longfang Ren,Fangfang Dong,Xiaodong Gao,Sijie Yu,Taotao Qiang
The flexible ammonia sensor can detect the ammonia content in the air or the exhaled gas of humans, but the commonly used sensors have poor breathability and washability, so they are not suitable for direct contact with human skin. In this work, based on the excellent flexibility and permeability of nonwovens, UiO-66-NH 2 /MoS 2 @nonwoven (UMN) and UiO-66-NH 2 /MoS 2 /Ag@nonwoven (UMAN) gas sensors were prepared by loading self-prepared UiO-66-NH 2 /MoS 2 (UM) and UiO-66-NH 2 /MoS 2 /Ag (UMA) onto microfiber nonwovens. The results show that UMN and UMAN gas sensors exhibit high selectivity toward ammonia gas. The response values of UMN and UMAN demonstrate a consistent linear trend within the ammonia concentration range of 1–50 ppm and reach 43 % and 47 % at 1 ppm respectively. The response variations of the sensors before and after bending are below 4 %, demonstrating excellent bending stability. After washing for 24 h, the gas sensing performance shows nearly no change, indicating that they both have good reusability and washability. However, the sensors exhibit limited thermal and humidity stability. Given the challenges such as poor breathability and insufficient biocompatibility faced by traditional flexible gas sensors, UMN and UMAN sensors have emerged as highly promising alternatives with distinct advantages.
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ANALYTICAL CHEMISTRY
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2025
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IF 6.7
Chengli Xie,Longcheng Gong,Tong Xu,Lianzhe Hu,Zhining Xia,Min Wang
To overcome the limitation of low catalytic activity in nanozyme labels for immunoassay, this study proposed a heterovalent Co-doping strategy to construct the bimetallic Zr/Co-UiO-66-NH2 nanozyme. Compared to the undoped UiO-66-NH2, the resulting nanozyme exhibited a 14-fold enhancement in phosphatase-like catalytic efficiency (kcat/Km). Mechanistic investigations revealed that the activity enhancement was not only dependent on the high specific surface area and increased defects introduced by heterovalent Co doping, but also was attributed to the electronic synergy between Zr and Co. Furthermore, a fluorescent immunoassay method utilizing highly efficient Zr/Co-UiO-66-NH2 as the nanozyme label was developed for the ultrasensitive detection of carcinoembryonic antigen (CEA). This method achieved a broad linear detection range spanning 6 orders of magnitude (1 × 10–12 g/mL to 1 × 10–6 g/mL) and a detection limit as low as 0.74 × 10–12 g/mL. The high recovery rates (95.89%–99.31%) in serum samples demonstrate great potential for the detection of CEA in complex biological matrices.
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高影响因子
LANGMUIR
·
2020
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IF 3.557
Huihui Lv,Yunting Zhang,Pan Chen,Jinping Xue,Xiao Jia,Juanjuan Chen
Harmful bacteria have seriously threatened human health and wealth for a long time. Herein, a multifunctional drug delivery system based on UiO-66 was fabricated, and it showed potent synergistic antibacterial effects when used in conjunction with photodynamic therapy and chemotherapy. First, UiO-66-NH2 was prepared via a facile solvothermal method. Then, carboxylic zinc phthalocyanine, a broad-spectrum photosensitizer, was connected to UiO-66-NH2 by amidation. Next, synergistic chemical antibiotic linezolid was loaded in the pores, and lysozyme was coated on the surface by electrostatic interactions. In vitro antibacterial experiments were then carried out to evaluate the antibacterial effects of this system against three kinds of bacteria, Staphylococcus aureus, Escherichia coli, and methicillin-resistant S. aureus (MRSA). The combination of lysozyme, linezolid, and singlet oxygen generated by irradiation of the photosensitizers resulted in a potent antibacterial effect against S. aureus, E. coli, and even MRSA, which demonstrates the synergistic antibacterial efficacy of photodynamic therapy and chemotherapy.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 3
·1-12
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IF 2.132
Ma Wenzhong,Li Taiyu,Zhang Qi,Zhong Jing,Matsuyama Hideto
Hydrophilic UiO-66 crystals with superior water adsorption ability were synthesized and incorporated into the polyimide (PI) membrane for efficient aprotic solvent separation via pervaporation. The effect of the different UiO-66 addition in the pyromellitic dianhydride (PMDA)-2, 2-bis[4-(4-amlnophenoxy)phenyl]propane (BAPP)-based PI membrane on the membrane structure, thermal stability, surface hydrophilicity, solvent-resistant, and pervaporation performance was systematically studied. The UiO-66/PI hybrid membranes with small amount content (2 wt%) exhibited high hydrophilicity and excellent swelling resistance due to the superb dispersion benefiting from the excellent complexation of UiO-66 and PI chain. The effects of operational variables such as operating temperature and concentration of feed solution on the pervaporation separation performance of the hybrid membranes with different UiO-66 loadings were investigated. When the mass fraction of UiO-66 was 2 wt%, the hybrid membranes show the permeation flux of 109.7 and 57.1 g/(m 2 h) and separation factor of 34.1 and 133.9, respectively, for DMF/H 2 O and DMAc/H 2 O systems.
Graphical abstract
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
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IF 4.551
Hao Guo,Jiaqin Liu,Yanhong Li,Jürgen Caro,Aisheng Huang
Due to their rationally controlled pore size and easy functionalization, metal-organic frameworks (MOFs) are a promising candidate for membrane separation . As one of the most stable MOFs, UiO-66 has attracted intense attention for the preparation of molecular sieving membranes. A new post-synthesis modification (PSM) strategy was developed to enhance the separation selectivity of supported UiO-66-NH 2 membranes on porous ceramic tubes called UiO-66-NH 2 @SA by using salicylaldehyde (SA) modification. The mixed gas separation factors of H 2 /CO 2 and H 2 /CH 4 can be improved due to constrictions of the pore size through reaction of –NH 2 with SA giving iminophenol moieties. Notably, SA-modified UiO-66-NH 2 membranes are rather stable, at a high operation temperature of 200 °C and 1 bar, mixture separation factors of 11.3 for H 2 /CO 2 and 22 for H 2 /CH 4 can be obtained. Further, no obvious performance degradation has been observed after 3 months storing in air. This high stability of UiO-66-NH 2 @SA membrane could provide possibility for the industrial applications of hydrogen separation and purification.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Danhua Guo,Huijun Li,Jiwei Wang,Zhouqing Xu
Leaching of fluoride in drinking water can lead to fluorosis. It is a good method to reduce the concentration of fluoride ion in drinking water by selecting the adsorption material with large adsorption capacity and good selectivity. Herein, the NH 2 -UiO-66 based loofah sponge modified porous composite was prepared. The composite material took loofah sponge (LS) as the carrier, and loaded NH 2 -UiO-66 on the surface of LS by in-situ growth method. The structure of the prepared NH 2 -UiO-66 @LS was investigated by PXRD , FTIR, SEM, and XPS. The influencing factors of different materials, contact time, adsorbent dosage, preliminary fluoride concentration, and co-existing anions were optimized. Compared with LS, the adsorption efficiency of NH 2 -UiO-66 @LS was greatly improved, and the adsorption capacity was 65.08 mg/g for fluoride ion. Moreover, the maximum removal efficiency of NH 2 -UiO-66 @LS was the initial fluoride concentration of 100 mg/L. Under the condition of the coexistence of other anions, the composite material has a specific adsorption performance for fluoride within 40 min. Furthermore, the data of fluoride adsorption was best fitted with pseudo-second-order kinetic model. The thermodynamic studies showed that the fluoride adsorption process on NH 2 -UiO-66 @LS was feasible, spontaneous and endothermic. In addition, synthesized NH 2 -UiO-66 @LS can be reused upto eight cycles. The plausible fluoride adsorption mechanism of NH 2 -UiO-66 @LS was majorly ruled by electrostatic attraction and complexation. Furthermore, the raw material is easy to obtain and the preparation process of NH 2 -UiO-66 @LS is simple. Hence, the large adsorption capacity of NH 2 -UiO-66 @LS compared with reported adsorbents for fluoride makes it have potential application prospect from wastewater on industrial scale.
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Journal of Water Process Engineering
·
2025
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IF 6.7
Xixiang Liu,Xiurong Chen,Yongming Luo,Caiyun Han,SuFang He
Much research has focused on the removal of individual contaminants such as As(V) or Cr(VI) from wastewater. However, limited efforts have been devoted to their simultaneous removal in binary systems. This is largely due to the complexity of wastewater matrices and the similar chemical characteristics of As(V) and Cr(VI). In this study, La-modified UiO-66 was synthesized by a one-pot method and employed as a multifunctional adsorbent to simultaneously remove As(V) and Cr(VI) via batch experiments. Characterization results demonstrated that La was successfully grafted onto UiO-66 through Zr-ligand (O)-La and Zr-ligand (O)-Zr linkages, while the fcu structural topology and microporous nature of UiO-66 were well remained. For simultaneous uptake of As(V) and Cr(VI), a synergistic effect of Cr(VI) was observed on As(V) removal, whereas As(V) exhibited an inhibitory effect on Cr(VI) adsorption. Compared with the single component system, the adsorption capacity of As(V) in the binary system increased by approximately 26 %, while the adsorption capacity of Cr(VI) decreased by about 20 %. The enhanced uptake of As(V) was attributed to the formation of a new Cr As complex compound between adsorbed Cr(III) and As(V). In contrast, the inhibitory influence of As(V) on Cr(VI) adsorption was ascribed to the strong affinity of As(V) for the active adsorption sites. Overall, these results demonstrate that La-modified UiO-66 is a promising candidate for the simultaneous removal of As(V) and Cr(VI) in binary systems, particularly under conditions of elevated As(V) concentration.
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