JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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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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FOOD CHEMISTRY
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2023
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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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Frontiers in Environmental Science
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2022
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IF 5.411
Feng Shuna,Yan Zheng,Ni Qianqian,Zhang Yun
As a primary goal, The fast recombination of stimulated excitons and poor visible light response are key problems in the photocatalysis field. Combining with materials with good visible light responses to form heterogeneous structures is still the most effective way. In this study, BiOBr/UiO-66-NH2 photocatalyst was synthesized by a simple method. BiOBr is a 3D spherical structure stacked by nanosheets, which enhance its adsorption capacity for pollutants and catalyze the dark reaction to reach the equilibrium point for too long. Coupling with UiO-66-NH2, its adsorption capacity was inhibited and the dark reaction time was shortened. The excellent removal rate of Rhodamine B (RhB) by BiOBr/UiO-66-NH2 reached 96.79% after 30 min of visible light irradiation and 99.37% after 90 min. With an increase in pollutant concentration, the composite still showed excellent photocatalytic performance. This study also tried to abandon the dark adsorption stage and directly degraded RhB efficiently and quickly under visible light. Finally, the photocatalytic enhancement mechanism was proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Xuesheng Liu,Junsu Jin
In this study, U-MIL-53/g-C 3 N 4 cascade Z-Scheme heterostructure nanocomposite was fabricated by a simple one-pot method. UiO-66 was first inserted into MIL-53/g-C 3 N 4 heterojunction as an electron-energy platform owing to its wide band gap, which blocked the type II charge transfer channel. The experimental results revealed that after visible light illumination for 45 min, the degradation rate of tetracycline in the optimized cascade Z-Scheme system was twice as high as that of MIL-53/g-C 3 N 4 and superior to the literature data. · O 2 – and·OH were detected as the main free radicals involved in the Z-Scheme photocatalytic reaction system. Furthermore, HPLC-MS was applied to detect the intermediate products in the photodegradation of tetracycline for a better understanding of the mechanism of the photocatalytic degradation process.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Yan Gao,Miao Yan,Jianshe Zhao
A composite PW 4 @UIO-66-NH 2 /GO was designed and prepared via facile in-situ synthesis method for catalytic oxidation desulfurization of fuel. The proper sizes (window size and pore size) of UIO-66-NH 2 can effective sealing PW 4 as monomolecular active component and prevent PW 4 leaching during the reaction process. At the same time, the introduction of GO can improve the electron transfer of the catalyst. Characterization tests showed that the active component PW 4 was successfully encapsulated with a loading amount of 0.19 mmol/g. The desulfurization results indicated that the PW 4 @UIO-66-NH 2 /GO has excellent catalytic activity, which can remove 99.9% sulfides in model fuel, and the activity did not decrease obviously after repeated use for ten times. The good activity and reusability of PW 4 @UIO-66-NH 2 /GO attributes to the introduction of GO and UIO-66-NH 2 . In addition, based on GC-MS and EPR results, a possible mechanism of desulfurization reaction was proposed.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Huanhuan Li,Wenhui Geng,Suleiman A. Haruna,Md Mehedi Hassan,Quansheng Chen
In this study, a target-responsive release Surface-enhanced Raman scattering (SERS) sensor was developed for sensitive detection of tetracycline (TTC) using aptamer-gated HP-UiO-66-NH 2 nanochannel strategy. The hierarchically porous zirconium-based metal-organic frameworks (HP-UiO-66-NH 2 MOFs) with high surface areas and the conjugated π-electron system were first synthesized and served as the nanocontainers. The methylene blue (MB) and gold nanoparticles (AuNPs) were then loaded in the pores of HP-UiO-66-NH 2 as the signal probes and capping agent, respectively. Thereafter, aptamer was assembled on the surface of HP-UiO-66-NH 2 based on the π-π stacking interaction. In the presence of TTC, the aptamer “molecular gate” was opened, resulting in the “cargo release” of MB and AuNPs. Hence, the amount of TTC could be determined by monitoring the change of SERS intensity of the supernatant. Under the optimal conditions, a good linear correlation between SERS intensity (886 cm −1 ) and TTC concentration was observed with the concentration from 0.01 to 10000 ng/mL, resulting in a relatively low detection limit of 0.01 ng/mL. Moreover, this method showed a promising practical application in spiked real samples (milk and pork) with recoveries of 93.23–108.79%, which confirmed its great potential in antibiotic detection.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Liyin Bu,Xiaohui Chen,Qingyuan Song,Ding Jiang,Xueling Shan,Wenchang Wang,Zhidong Chen
In this study, a supersensitive electrochemical impedance spectroscopy (EIS) analysis method combined the molecularly imprinted polypyrrole (MIP) which electropolymerized on the composites of zirconium-based metal organic framework (Uio-66) and carbon dots (CDs) modified glassy carbon electrode (GCE) was developed for chloramphenicol (CAP) determination. The integration of Uio-66 and CDs effectively promoted the sensitivity of the proposed MIP senor by improving the surface area and the charge transfer of electrode. By extraction of CAP template, the specific sites were formed on the MIP surface which can rewrap the CAP target molecules. The CAP determination was based on the charge transfer difference (△Rct) before and after the MIP/ [email protected] /GCE rebinding the CAP. The results showed that △Rct responded good linearity to the logarithm of CAP concetration in the range of 0.1 – 100 pmol/L, with a low detection limit of 0.061 pmol/L (S/N = 3), exhibiting high sensitivity and specificity for the determination of CAP.
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FOOD CHEMISTRY
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2022
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IF 9.231
Rui-Miao Chang,Yan-Yang Zhang,Guang-Bin Zhang,Xiao-Xia Zhang,An-Jia Chen,Wen Zhang,Yong Li
The purpose of this study was to treat UiO-66 (University of Oslo 66) under suitable thermal alkaline hydrolysis condition to realize the loading of gallic acid. UiO-66-SH (UiO-66-separated-heating) was obtained by separated heating UiO-66 and 0.2 M KOH aqueous solution to 120 ℃ before mixing for 3 h. The material was in an amorphous state, maintained the octahedron structure and size of UiO-66. UiO-66-SH has better porosity and specific surface area than UiO-66, and had good thermal stability until heated to 1000 ℃. Furthermore, UiO-66-SH had very little influence of the cellular activity of human normal heptical cell line, demonstrating its good biocompatibility. The prepared UiO-66-SH could successfully adsorb gallic acid and control the release of gallic acid in simulated gastric fluid (∼58% vs. ∼ 88% of free gallic acid). This study will be conducive to preparation of appropriate carrier used to load with polyphenolic compounds such as gallic acid.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Tingting Zhang,Hao Guo,Meng Yang,Lei Sun,Junye Zhang,Mingyue Wang,Fan Yang,Ning Wu,Wu Yang
In this study, metal–organic backbone (UiO-66-NH 2 ) and thionyl chloride functionalized carbon nanotubes (COCl-MWCNT) were successfully synthesized, and introduced into carbon black (CB) for fabricating novel electrochemical sensor UiO-66-NH 2 /COCl-MWCNT/CB/GCE towards simultaneous determination of dihydroxybenzene isomers hydroquinone (HQ), catechol (CC) and resorcinol (RC). Due to large surface area, excellent conductivity, good electrocatalytic activity and high stability the developed composite modified electrode delivered excellent analytical performance for these three analytes. Under optimal conditions, differential pulse voltammetric (DPV) currents showed good linear relationships with the concentrations of HQ, CC and RC with low detection limits (0.24 μM, 0.11 μM, 0.47 μM) and wide detection ranges (1–1000 μM and 5–1000 μM). In addition, this sensor demonstrated favorable reproducibility, stability and good selectivity for HQ, CC and RC and possessed a great potential for selective detection of dihydroxybenzene isomers in environmental water samples.
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CATALYSIS TODAY
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2022
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IF 6.562
Hailong Xu,Miaomiao Chen,Min Ji
A series of highly-defective UiO-66 were synthesized and utilized as catalyst in the hydrogenation of cinnamaldehyde (CALD) to cinnamylalcohol (CALH) in isopropanol. The physico-chemical properties of the catalysts were characterized by powder X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis and N 2 adsorption-desorption. It was found that there are two kinds of atomic Lewis acid-base pairs existing in the defective UiO-66, exactly Zr 4+ -O 2- and Zr 4+ -OH - , which are active sites for CALD hydrogenation to form CALH. UiO-66–0.3 with the most defects shows a much higher reaction rate constant, which is 5.5 times that of UiO-66–2.0, and gives the best CALD conversion of 85.5% and CALH selectivity of 94.0% at 140 ℃ after 3 h. The acid-base synergistic catalysis mechanism was proposed. Moreover, the defective UiO-66 showed good recyclability for up to 7 cycles with retention of catalytic activity as well as structural stability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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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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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Jian Chen,Jinbo Ouyang,Wenqian Chen,Zepeng Zheng,Zhen Yang,Zhirong Liu,Limin Zhou
Porous chitosan/Zr-MOF (UiO-66) composite foams (CSF@UiO-66) were facilely prepared by grafting UiO-66 into polymerized chitosan using epichlorohydrin as the linking agent. The flexible foams with high loadings of UiO-66 exhibited low density (15.0 ∼ 23.4 mg/cm 3 ) and superior liquid–solid separation performance. The hierarchical pores and abundant functional groups contributed to the effective removal of ketoprofen (KPF) from water by the composite foams, achieving a maximum adsorption capacity of 209.7 mg/g at pH 4, outperforming most reported adsorbents. Batch adsorption experiments demonstrated that the adsorption of KPF could be described by the Langmuir isotherm and pseudo-second-order kinetic model. Importantly, the composite foams showed excellent performance even in the presence of some ions and good reusability for engineering applications. Furthermore, density functional theory (DFT) calculations revealed that the adsorption mechanism between the composite foams and KPF could be attributed to hydrogen bonding and π-π interaction. In essence, this work provides an innovative strategy for the fabrication of a blocky composite foam with high loadings of MOF for efficient adsorptive removal of KPF in liquids, which can overcome the disadvantages of agglomeration due to small particle size and poor stability of MOFs.
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