COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yawen Tan,Yi Zhou,Yuehong Deng,Haiqin Tang,Hao Zou,Yifeng Xu,Jiaxin Li
The introduction of metal-organic frameworks into semiconductor photocatalysts is one of the strategies to improve the separation efficiency of electron-hole pairs. In this study, UiO-66-NH 2 /Bi 2 WO 6 nano-heterojunction was constructed for the first time by introducing UiO-66-NH 2 into the Bi 2 WO 6 precursor solution. A series of characterizations such as XRD , XPS and FT-IR have indicated that the successful synthesis of the composites and showed that UiO-66-NH 2 and Bi 2 WO 6 are tightly connected and interacted. SEM results showed that the introduction of UiO-66-NH 2 can increase the distance between bismuth tungstate nanosheets and effectively inhibit the agglomeration of Bi 2 WO 6 . The visible light degradation efficiency of 6% UiO-66-NH 2 /Bi 2 WO 6 can reach 99.7%. The improvement of photocatalytic activity could be attributed to the formation of a type II heterojunction in the composite, which effectively promoting the separation of electron and holes.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-11
·
IF 5.833
Li Jingxian,Jiang Ding,Shan Xueling,Wang Wenchang,Ou Guofu,Jin Haozhe,Chen Zhidong
A novel aptasensor has been fabricated based on the resonance energy transform (RET) system from MoS 2 QDs-PATP/PTCA (donor) to NH 2 -UiO-66 (acceptor). The electrochemiluminescence (ECL) signal of PTCA was greatly amplified due to the decoration of MoS 2 QDs-PATP, and the NH 2 -UiO-66 was utilized to label the signal probe DNA (pDNA), which hybridizes with the exposed aptamer anchored on the surface of MoS 2 QDs-PATP/PTCA. With the target acetamiprid, the specific binding of acetamiprid to aptamer causes the connection between the donor and the acceptor to be interrupted and produce an “on” ECL signal. Thus, an “off-on” ECL sensing platform for sensitive and selective acetamiprid assay was designed. Under the optimal condition, the ECL signal of the aptasensor was found to be linearly related to the logarithm of the acetamiprid concentration ranging from 0.1 fM to 0.1 μM with a detection limit of 0.064 fM. More importantly, the recovery rate of the ECL aptasensor was calculated to be 98.7 ~ 106% with a RSD lower 5.1% for the residual acetamiprid assay in real food samples, which indicated that the aptasensor has high potential for practical applications. Graphical abstract
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PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·734-747
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IF 2.482
Zhang Xiaorui,Chen Chen,Jiang Caiyun,Zhou Haifei,Cao Wang,Wang Yuping
Abstract A new type of Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction nanocomposite with visible light catalytic activity was successfully prepared. The synthesis of the composite was confirmed by XRD, FT-IR, SEM, TEM, EDS, XPS. The Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction can effectively improve the utilization of visible light. The optimal Ag/U/1/4 composite has the highest degradation efficiency for methylene blue (MB, 30 mg/L) in 90 min (80%) and Norfloxacin (NOR, 10 mg/L) in 150 min (85%). The decrease of Nyquist radius and the enhancement of photocurrent response indicated that the combination of photogenerated electron–hole pair in Ag 3 PO 4 /UiO-66-NH 2 composite material is significantly inhibited. N 2 adsorption–desorption and zeta potential results indicated that biggish specific surface area and negative zeta potential value are more favorable for the adsorption of the cationic dye MB. The cyclic test verified the good stability of Ag 3 PO 4 /UiO-66-NH 2 heterojunction material. Furthermore, the photocatalytic degradation mechanism of MB was discussed by introducing different traps to inhibit the possible active substances in the degradation process. This work testified that an efficient photocatalytic composite based on metal–organic frameworks can be used for the degradation of pollutants. Graphic Abstract
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Qingqing Hou,Xiyi Li,Yunhong Pi,Jing Xiao
Photocatalytic conversion of CO2 into fuel and value-added chemicals as a promising method has been applied recently to ease energy- or environment-related crises. Herein, we construct an In2S3@NH2-MIL-68(In)@In2S3 (denoted as SMS(In)) sandwich homologous heterojunction via a controllable in situ metal–organic frameworks (MOF) sulfuration process. The improved photoreduction activity mainly lies in the effective charge transfer and separation through a homogeneous interface, enhanced CO2 adsorption and mass transfer, and plentiful reactive sites. Benefiting from this unique hollow homologous heterojunction, SMS(In)-7 obtains a CO generation rate as high as 11.23 μmol g–1 h–1 with visible-light irradiation, nearly 3 times enhancement over that of pure MOF-derived In2S3. This work provides a novel insight into the utilization of MOF-based platform for an efficient atomically heterojunction design.
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高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Zhuizhui Su,Bingxing Zhang,Xiuyan Cheng,Fanyu Zhang,Qiang Wan,Lifei Liu,Xiuniang Tan,Dongxing Tan,Lirong Zheng,Jianling Zhang
UiO-66-NH 2 , an important metal–organic framework, is usually synthesized by solvothermal method and the particle size is generally larger than 200 nm, which limits its catalytic applications in chemical reactions. It is very meaningful to produce UiO-66-NH 2 nanoparticles with ultra-small size, but remains challenging. Herein, we synthesized UiO-66-NH 2 nanoparticles in size of 8–15 nm that are immobilized on g-C 3 N 4 nanosheets. Compared with the UiO-66-NH 2 synthesized by the traditional solvothermal method (> 200 nm), the ultra-small UiO-66-NH 2 nanoparticles immobilized on g-C 3 N 4 have more unsaturated coordination positions and increased Lewis acidity. Owing to these combined advantages, the ultra-small UiO-66-NH 2 nanoparticles exhibit greatly improved catalytic activity for Meerwein–Ponndorf–Verley reaction than larger UiO-66-NH 2 particles.
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高影响因子
POLYHEDRON
·
2020
·
IF 2.343
Jian-Han Zhang,Zhi-Zhong Su,Ju-Xiang Luo,Yi Zhao,Hong-Gang Wang,Shao-Ming Ying
A mixed amines thiogermanate, namely (NH 4 ) 2 [NH 2 (CH 3 ) 2 ] 2 Ge 2 S 6 has been successfully synthesized by solvothermal reaction. Single crystal X-ray diffraction indicates the compound crystallizes in monoclinic space group P 2 1 / c with the lattice parameters: a = 6.9647(14) Å, b = 15.719(3) Å, c = 7.2042(14) Å, β = 92.76(3)°. The structure features a zero-dimensional [Ge 2 S 6 ] 4− anions which are separated by NH 4 + and [NH 2 (CH 3 ) 2 ] + . Hydrogen bond interactions play a crucial role in its structure formation. X-ray powder diffraction and TG-DSC measurements were performed to study its phase purity and thermal stability. UV–Vis diffuse reflectance spectroscopy coupled with Urbach fitting indicates an indirect optical transition semiconductor with a bandgap value of 3.50 eV. The result of first-principles electronic structure calculation supported the experimental indirect optical transition but the value was under estimated as 3.061 eV. Density of states and population analysis were also calculated to reveal the origin of the bandgap and bond interaction for its structure formation.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xun Fang,Shibiao Wu,Yaohua Wu,Wu Yang,Yulian Li,Junyong He,Peidong Hong,Mingxing Nie,Chao Xie,Zijian Wu,Kaisheng Zhang,Lingtao Kong,Jinhuai Liu
Antibiotics abuse has been a significant threat to the environment and human health. In this study, we successfully synthesized highly stable amino-functionalized Zr-based metal–organic frameworks (UiO-66-NH 2 ) and studied the adsorption behaviors of norfloxacin (NOR) in water. The adsorption capacities of UiO-66-NH 2 reached a maximum of 222.5 mg/g for NOR, which were considerably higher than that of most reported adsorbents. Moreover, the equilibrium time (6 h) was less than that of several previously reported adsorbents. Ionic-strength-influenced experiments showed that NaCl and CaCl 2 aqueous solutions could improve the removal efficiency of NOR. The presence of humic acid could barely affect the adsorption amount. At a concentration of 10 mg/L, the highest partition coefficient of 20.9 mg/g/µM was obtained, and the removal rate of NOR was as high as 91.6%, implying that UiO-66-NH 2 offered considerable adsorption performance at a low concentration of NOR. In addition, UiO-66-NH 2 exhibited good regeneration efficiency, thus offering the possibility to remove norfloxacin from sewage. Finally, several credible adsorption mechanisms were proposed. The results will aid us to comprehend the surface interaction between organic micropollutants and UiO-66-NH 2 and prefigure the potential of UiO-66-NH 2 as a novel adsorbent for the removal of NOR.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Linna Song,Tianyu Zhao,Dongzhi Yang,Xuejiao Wang,Xinmin Hao,Yaxin Liu,Shiyi Zhang,Zhong-Zhen Yu
Lightweight and wearable fabrics with rapid self-detoxification functions are highly desired to resist chemical warfare agents (CWAs). Metal organic frameworks (MOFs) with high specific surface area and customizability are singularly attractive because of their ability to effectively capture and catalytically degrade CWAs. Herein, photothermal graphene-based nanocomposite fabrics are designed by wet-spinning and chemical reduction of graphene oxide fibers followed by in situ growth of UiO-66-NH 2 . The flexible graphene fabrics decorated with UiO-66-NH 2 nanoparticles exhibit an ultrafast photothermal catalytic decontamination of dimethyl 4-nitrophenyl phosphate (DMNP), a typical simulant of CWAs. The half-life of the degradation reaction decreases from 3.4 to 1.6 min under simulated solar light irradiation, a significant gain over the values reported in the literature. Furthermore, DMNP can be degraded in 20 min by the graphene/UiO-66-NH 2 fabric, and even after 5 cycles the degradation efficiency still retains more than 92 %. More importantly, the photothermal conversion of graphene and its instantaneous heat transfer to the UiO-66-NH 2 catalyst effectively accelerate the catalytic reaction kinetics, achieving the fast detoxification of DMNP. The combination of catalytic degradation of MOFs with photothermal conversion effect of graphene makes the lightweight and flexible fabrics promising for protection against CWAs and other pollutants.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xu Li,Yanli Zhang,Qingping Xin,Xiaoli Ding,Lizhi Zhao,Hui Ye,Ligang Lin,Hong Li,Yuzhong Zhang
Membrane absorption is a convenient and efficient flue SO 2 capture technology . In this study, NH 2 -MIL-125 filled mixed matrix membrane contactor (MMMC) is constructed by Non-solvent Induced Phase Separation (NIPS) method. The functional groups and metal active sites on the surface of NH 2 -MIL-125(Ti) exhibit high affinity for SO 2 . The microporous structure of NH 2 -MIL-125(Ti) provides storage for adsorbed SO 2 , which is conducive to the formation of SO 2 enrichment zone in the membrane. The membrane morphology, wetting resistance, and light responsiveness et al of MMMC have been tested. The combination of NH 2 -MIL-125(Ti) adsorption and membrane absorption process effectively promotes the transfer of gas molecules in the membrane pores. The SO 2 absorption flux of MMMC filled by NH 2 -MIL-125(Ti) has a significant increment, reaching 8.81 × 10 −4 mol·m −2 ·s −1 and 9.77 × 10 −4 mol·m −2 ·s −1 under non-light and visible light conditions respectively, which is comparability with results in literature. The membrane phase mass transfer coefficient calculated by Wilson model is 149.6 s·m −1 , which shows the low resistance in membrane. The SO 2 absorption flux keep stable after 4 cycles of tests. The membrane contactor coupled with function fillers enhances the SO 2 capture ability and further promotes the enrichment of SO 2 , which has favorable development foreground.
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Junjie Zhu,Linbo Wu,Zhiyang Bu,Suyun Jie,Bo-Geng Li
UiO-66-NH2, a zirconium-based functional metal–organic framework (MOF), was postsynthetically modified via Schiff base reaction between aldehyde groups in glutaraldehyde and amino groups in UiO-66-NH2 and CO2-preabsorbed polyethyleneimine (PEI). The resulting PEI-modified MOFs, abbreviated as PEIC@UiO, were characterized with 1H NMR, Fourier transform infrared, powder X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, and thermogravimetric analysis and evaluated as CO2 adsorbents. In comparison with pristine UiO-66-NH2, the PEIC@UiO adsorbents have reduced specific surface area (7–150 m2/g) but maintained the same crystal structure. Particularly, the PEIC96@UiO adsorbent exhibited significantly improved CO2/N2 adsorption selectivity (48 vs 25) and higher CO2 adsorption capacity (3.2 vs 2.7 mmol/g). The adsorbent also displayed moderate desorption energy (68 kJ/mol CO2), superior moisture endurance, and recyclability, which are very desirable for practical applications.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 43
·24802-24810
·
IF 3.049
Xu Zhang,Yufan Zhang,Tiecheng Wang,Zheng Fan,Guoliang Zhang
A facile controlled interfacial polymerization strategy was proposed for the synthesis of novel thin film nanocomposite (TFN) membranes for enhanced nanofiltration performance. UiO-66 nanoparticles were aminated and pre-immobilized onto a polymer substrate via polydopamine (PDA) coating to achieve a continuous and defect-free polyamide dense layer. The mediation of the PDA coating could not only enhance the structural stability of TFN nanofiltration membranes, but also improve the dispersion and anchorage of UiO-66-NH2, thus closely fixing the position of UiO-66-NH2 nanoparticles on the polymer substrate. Moreover, since the amino group (–NH2) further reacted with PDA via Michael addition or Schiff base reaction, the in situ mutual reaction reduced the nanoparticle losses significantly during the draining off of the monomer solution in the fabrication process, which effectively cut down the actual dosage. The results showed that the PDA interlayer could induce the tight attachment of the PA layer to the support, enhancing the structural stability of TFN membranes. Furthermore, the dosage of UiO-66-NH2 in the as-prepared TFN membranes could also be decreased to as low as 0.01 w/v%, which was nearly a 10–20-fold reduction in the required amount of UiO-66-NH2 for the synthesis. The fabricated TFN/UiO-66-NH2 membranes exhibited very high water permeance and competitive salt rejections in cross-flow nanofiltration, which shows the huge potential for the application of novel TFN membranes with controlled nanoparticle incorporation in industrial separation.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Yunzhe Jiang,Chuanyao Liu,Jürgen Caro,Aisheng Huang
A new UiO-66-NH 2 based MOF named UiO-66-NH 2 @ICA has been prepared by grafting imidazole-2-carbaldehyde (ICA) to UiO-66-NH 2 through a post-synthesis reaction via amine condensation. FESEM , XRD , 1 H NMR, FT-IR and N 2 adsorption were used to characterize the morphology and structure of UiO-66-NH 2 @ICA. The grafted ICA mainly reduces the pore volume of UiO-66-NH 2 but increases the number of nitrogen atom as binding site of CO 2 . The UiO-66-NH 2 @ICA showed less BET surface area but a higher CO 2 /CH 4 adsorption selectivity in comparison with UiO-66-NH 2 . UiO-66-NH 2 @ICA and UiO-66-NH 2 crystals were dispersed in Matrimid ® 5218 to form mixed-matrix membranes (MMMs). Single gas permeation and mixed gas separation was carried out to investigate the effects of filler loading and feed gas pressure on the separation performances of the MMMs. The UiO-66-NH 2 @ICA/Matrimid ® MMM with 10 wt % filler showed a high CO 2 /CH 4 selectivity with a separation factor of 64.7, which is an increase by 40% in comparison with UiO-66-NH 2 /Matrimid ® MMM.
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