INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Pengfei Li,Yingbo Chen,Fan Xiao,Ming Cao,Jingyu Pan,Jingfeng Zheng,Ke Zhao,Hao Li,Xianglin Zhang,Yuanyuan Zhang
The performance of proton exchange membranes (PEMs) can be enhanced by creating continuous proton conduction channels. In this work, PVP-UiO-66-NH-SO 3 H nanoparticles (PUNSNPs) were prepared and filled into sulfonated poly (ether ether ketone) (SPEEK) to fabricate PUNSNPs/SPEEK composite PEMs. To further improve the performance of the PEMs, phosphoric acid (PA) was doped and a continuous nanopore network was formed in PA/PUNSNPs/SPEEK porous PEMs due to the dissolution of PUNSNPs. The PA/PUNSNPs/SPEEK porous PEMs have high PA uptake ratio (96%–117 %) and dimensional stability thanks to the anchoring effect of the nitrogen-containing heterocyclic ring on the PVP chains. The acid-base pairing interaction between the chains (residual ligands from PUNSNPs) inside the unique continuous nanopore structure allows PA/PUNSNPs/SPEEK = 20 % porous PEMs to have the highest proton conductivity of 0.350 S cm −1 (80 °C/100 % RH). Furthermore, the PA/PUNSNPs/SPEEK porous PEMs retained PA up to more than 80 % (80 °C, 40 % RH, 7 days). Similarly, PA/PUNSNPs/SPEEK = 20 % porous PEMs immersed in deionized water for 45 days were able to maintain a proton conductivity of more than 83 %. Finally, PA/PUNSNPs/SPEEK porous PEMs have low methanol permeability . Thus, this study provides a new method for the preparation of porous PEMs with a continuous nanopore network structure and excellent performance.
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 10
·1897-1905
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IF 4.8
Wei Tao,Zhang Qi,Wang Sijia,Wang Mengting,Liu Ye,Sun Cheng,Zhou Yanyan,Huang Qing,Qiu Xiangyun,Tian Fang
All solid-state electrolytes have the advantages of good mechanical and thermal properties for safer energy storage, but their energy density has been limited by low ionic conductivity and large interfacial resistance caused by the poor Li + transport kinetics due to the solid–solid contacts between the electrodes and the solid-state electrolytes. Herein, a novel gel polymer electrolyte (UPP-5) composed of ionic liquid incorporated metal-organic frameworks nanoparticles (IL@MOFs) is designed, it exhibits satisfying electrochemical performances, consisting of an excellent electrochemical stability window (5.5 V) and an improved Li + transference number of 0.52. Moreover, the Li/UPP-5/LiFePO 4 full cells present an ultra-stable cycling performance at 0.2C for over 100 cycles almost without any decay in capacities. This study might provide new insight to create an effective Li + conductive network for the development of all-solid-state lithium-ion batteries.
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Small
·
2023
·Vol. 20
·期 7
·2306820
·
IF 13.3
Zheng Zheng,Bing Wang,Zhuo Li,Hong Hao,ChaoYang Wei,WenYu Luo,LinYu Jiao,Sheng Zhang,Bo Zhou,XiaoXun Ma
Constructing heterojunction of supramolecular arrays self-assembled on metal–organic frameworks (MOFs) with elaborate charge transfer mechanisms is a promising strategy for the photocatalytic oxidation of organic pollutants. Herein, H 12 SubPcB–Br (SubPc–Br) and UiO-66 are used to obtain the step-scheme (S-scheme) heterojunction SubPc–Br/UiO-66 for the first time, which is then applied in the photocatalytic oxidation of minocycline. Atomic-level B–O–Zr charge-transfer channels and van der Waals force connections synergistically accelerated the charge transfer at the interface of the SubPc–Br/UiO-66 heterojunction, while the establishment of the B–O–Zr bonds also led to the directional transfer of charge from SubPc–Br to UiO-66. The synergy is the key to improving the photocatalytic activity and stability of SubPc–Br/UiO-66, which is also verified by various characterization methods and theoretical calculations. The minocycline degradation efficiency of supramolecular SubPc–Br/UiO-66 arrays reach 90.9% within 30 min under visible light irradiation. The molecular dynamics simulations indicate that B–O–Zr bonds and van der Waals force contribute significantly to the stability of the SubPc–Br/UiO-66 heterojunction. This work reveals an approach for the rational design of semiconducting MOF-based heterojunctions with improved properties.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiajun Yu,Xiao Wang,Yan Wang,Xiaofeng Xie,Haijiao Xie,Nat Vorayos,Jing Sun
The removal of indoor/outdoor toluene by photocatalysis has drawn much attention due to its low energy consumption and easy availability. However, light inevitably generates heat, and pollutants desorb from catalysts as the temperature rises, which is not beneficial to degradation. Contrast to the frequently occurred phenomena, we firstly found that the adsorption capacity of UiO-66 (Zr) on toluene increased with increasing temperature as adsorption isotherms and in-situ Fourier transform infrared spectra (in-situ FTIR) showed. The optimum temperature was 30 °C. This stage in which adsorption capacity was positively correlated with temperature was called heating-induced adsorption, which achieved a toluene removal efficiency of 69.6 %. By density functional theory (DFT) calculations and changing the metal centers and organic ligands of UiO-66 (Zr) respectively, we disclosed that the heating-induced adsorption was mainly related to the π-π stacking interaction of MOF ligands and toluene. The analysis of samples before and after adsorption showed that the interaction between UiO-66 (Zr) and adsorbed toluene facilitated the charge transfer and prolonged the carrier lifetime, leading to the increase of hydroxyl radicals (•OH) in photocatalysis. Therefore, a synergistic effect between heating-induced adsorption and photocatalysis was proposed by analyzing the adsorption of toluene on UiO-66 (Zr) in detail. This work provided new viewpoint to understand the role of concomitant heat contributed to the adsorption and degradation of toluene during photocatalysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Zhitong Xu,Ye Qi,Yueguang Fang,Peng Tian,Guiling Ning,Junwei Ye
Core-shell Fe 3 O 4 @UiO-66-NH 2 nanospheres with superior photocatalytic activity and photo-Fenton performance were synthesized using a layer-by-layer growth strategy. The synthesis involved the use of FeCl 3 , trisodium citrate, sodium acetate, ZrCl 4 , and 2-aminoterephthalic acid as raw materials, with mercaptoacetic acid serving as a modifier. Fe 3 O 4 @UiO-66-NH 2 demonstrated improved visible-light-driven photocatalytic performance in the oxidation degradation of Rhodamine B (RhB) in the presence of trace amounts of H 2 O 2 under visible light irradiation. The Fe(II)/Fe(III) cycle was accelerated by the transfer of the photogenerated electrons (e-) from UiO-66-NH 2 to Fe 3 O 4 , which in turn encouraged the Fenton reaction to produce hydroxyl radicals (•OH). With only 10 mmol/L H 2 O 2 , the removal rate of RhB approached 94% in 120 min. Furthermore, when exposed to visible light, Fe 3 O 4 @UiO-66-NH 2 exhibited 99% efficacious antibacterial activity against Escherichia coli and Staphylococcus aureus . Overall, the as-prepared Fe 3 O 4 @UiO-66-NH 2 core-shell nanospheres show promise for practical applications as photocatalysts for the degradation of organic pollutants and the inactivation of bacteria in wastewater.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaoyue Yue,Long Fu,Jingwen Zhou,Yan Li,Min Li,Yawen Wang,Yanhong Bai
Antibiotic residues cause extensive damage to food security, thus arousing serious concerns. Hence, rapid and sensitive detection of antibiotic residues is crucial to food safety. This study aimed to propose a portable, visual, intelligent and rapid method for tetracycline detection. We developed a ratiometric fluorescent sensor based on the Eu 3+ -functionalized regular octahedral UiO-66-NH 2 material. The developed sensor could quantify tetracycline in the concentration range of 0.5–200 μM with a detection limit as low as 0.2 μM under the optimum conditions. Furthermore, the analytical results obtained using the designed sensor in the actual samples were basically consistent with those obtained using high-performance liquid chromatography. Based on these achievements, a smartphone application-integrated fluorescent testing paper was designed for facile, intelligent, and visual detection of tetracycline. The integrated portable sensor not only saved cost and time for testing but also provided a forward-looking approach to fast, sensitive detection of antibiotic residues.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qingqing Li,Yingzhang Shi,Zhiwen Wang,Cheng Liu,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of dehydrated MoS 2 /UiO-66(SH) 2 (MS/UiS) composites has been prepared as photocatalysts for N 2 fixation. Typically, 10% MS/UiS exhibits the best performance with an NH 4 + yield rate of 54.08 μmol∙g −1 ∙h −1 . 15 N isotope test confirmed that the sample 10% MS/UiS was most effective for reducing N 2 to ammonia. Such enhanced activity was due to the presence of abundant unsaturated Zr and Mo sites which would synergistically promote the adsorption and activation of N 2 . The photogenerated electrons would transfer to the unsaturated Zr-O clusters while part of photogenerated electrons at the interface migrate to MS via Mo VI -O interactions between MS and UiS. These two electron transfer pathways effectively promote the separation of photogenerated carriers. The activated N 2 is reduced to ammonia by the synergistic effect of protonated hydrogen and photogenerated electrons. Finally, a possible N 2 fixation mechanism is proposed which emphasizes the significant roles of nitrogen activation and interface interaction in composites photocatalyst for improving photocatalytic performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-17
·
IF 2.8
Fan Yan,Wang Lei,Sun Xueqin,Li Cuili,Liu Jiacheng
A series of UiO-66-NH 2 -CA-Cu/g-C 3 N 4 (UCC 1 /CN x ) heterogeneous photocatalysts were constructed via a facile physical mixing treatment of the covalently post-modified MOF (UiO-66-NH 2 -CA-Cu) and functional materials g-C 3 N 4 . The tetracycline removal by the photocatalysis coupled with persulfate activation were studied under white light irradiation. The optimal UCC 1 /CN 20 photocatalyst showed the best photocatalytic performance, in which 94.0% TC could be efficiently eliminated ( k = 0.08669 min −1 ) within 30 min. The satisfactory degradation performance could be ascribed to the effective separation of photogenerated electron-hole pairs over the heterogeneous binary structure, which were demonstrated by several characteristic technologies including photoluminescence spectra, electrochemical impedance spectroscopy, transient photocurrent response and Bader charge analysis based on density functional theory calculations. Moreover, a possible mechanism behind the photocatalytic degradation was proposed and further affirmed by the quenching experiments and electron spin resonance measurements. Our work may supply a feasible idea for treating wastewater contained organic pollutants based on the heterogeneous photocatalyst.
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CHEMOSPHERE
·
2023
·
IF 8.8
Guizhen Li,Yao Zhang,Xinyu Hu,Wei Tan,Jiaxiong Li,Daiyan Su,Hongbin Wang,Min Yang
In the present study, Ni-UiO-66 was synthesized to improve the adsorption efficiency of tetracycline (TC) in wastewater treatment . To this end, nickel doping was performed in the preparation process of UiO-66. The synthesized Ni-UiO-66 was characterized by XRD , SEM and EDS, BET, FTIR, TGA , and XPS for obtaining the lattice structure, surface topography, specific surface area, surface functional groups, and thermostability. More specifically, Ni-UiO-66 has a removal efficiency and adsorption capacity of up to 90% and 120 mg g −1 , respectively, when used to treat TC. The presence of ions HCO 3 − , SO 4 2− , NO 3 − and PO 4 3− slightly affects the TC adsorption. A 20 mg L −1 humic acid reduces the removal efficiency from 80% to 60%. The performed analyses revealed that Ni-UiO-66 had similar adsorption capacity in wastewater with different ion strengths. The variation of adsorption capacity with the adsorption time was fitted using a pseudo-second-order kinetic equation . Meanwhile, it is found that the adsorption reaction occurs only on the monolayer of the UiO-66 surface so the adsorption process can be simulated using the Langmuir isotherm model. The thermodynamic analysis indicates that the adsorption of TC is an endothermic reaction . Electrostatic attraction, hydrogen-bond interaction, and π-π interaction might be the main reasons for the adsorption. The synthesized Ni-UiO-66 has well adsorption capacity and stable structure. Accordingly, it is expected to achieve a good prospect in industrial applications and wastewater treatment plants .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiaoyan Duan,Kaiqiang Wang,Lei Wang,Limin Cao,Jianxin Sui,Hong Lin
In this study, a new metal-organic framework adsorbent (UIO-66-NH 2 @TA) which can efficiently and selectively capture lead ions was developed by functionalizing UIO-66-NH 2 with tannic acid (TA) by Michael addition reaction. The structural and morphological properties of the produced adsorbent, as well as its adsorption mechanism for Pb (II) were discussed. The maximum adsorption capacity of Pb (II) was 475.78 mg/g at pH 5.0, which was significantly higher than the adsorption capacity of many adsorbents reported in the literature. In addition, the adsorption isotherms and kinetics conformed to the Langmuir model and pseudo-second-order kinetic model , respectively. The results indicated that the adsorptive behavior of the adsorbent mainly depended on the active sites on the surface of the adsorbents. The UIO-66-NH 2 @TA showed favorable selectivity toward Pb (II) against the interference of coexisting metal ions . It was found that the excellent Pb (II) removal performance of UIO-66-NH 2 @TA was mainly attributed to the synergistic effect of physical adsorption and chemisorption . Moreover, the UIO-66-NH 2 @TA showed extraction efficiencies of 88.01%, 82.44%, 80.20% and 74.99% for Pb (II) with initial concentration of 100 mg/L in river water, sea water, peach juice drink, and grape juice, respectively. This work proved that the UIO-66-NH 2 @TA had a wide application prospect in the field of Pb (II) treatment.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wei He,Xiaoqing Li,Zhengxin Qian,Zhen Liu,Zhenghua Tang
Developing dual functional electrocatalyst for both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is critical for promoting energy conversion efficiency in fuel cells and metalair batteries, and produce hydrogen with high purity. Herein, PdAg bimetallic nanoparticles encapsulated in porous carbon have been prepared and utilized as effective electrocatalysts for both ORR and HER. The surface microstructure, crystal structure, as well as electronic charge states of the bimetallic particles encapsulated in porous carbon were studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. In the bimetallic PdxAg100-x (x represents the initial atomic Pd ratio in PdAg alloys) series, the Pd50Ag50 sample exhibited the best performance, of which its ORR activity and long-term stability were superior to Pd/C in alkaline media along with its HER performance was comparable with Pd/C in acid solution. The study provides a reliable method for fabricating carbon substrate supported bimetallic alloys with good activity and robust stability toward ORR, HER and beyond.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60574-60589
·
IF 5.8
Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping
In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.
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