OPTICAL MATERIALS
·
2022
·
IF 3.754
Hao Hu,Jiacheng Jin,Mingchen Xu,Chengdong Xu,Yue Cheng,Weiwei Ji,Zhencen Ding,Min Shao,Yushan Wan
The present work demonstrates the synthesis of the microsphere composite photocatalyst Bi 3 O 4 Br/NH 2 -MIL-125(Ti) (BOB/NMILT) system, and the physicochemical properties of the material were analyzed by various characterization means. Further, the photocatalytic performance of the BOB/NMILT system was evaluated by degrading tetracycline (TC) under simulated sunlight. The degradation rate of TC using BOB/NMILT-5 reached 88.5% within 90 min. The degradation rate is 6.5 times and 3 times higher than that of individual catalysts NH 2 -MIL-125(Ti) (NMILT) and Bi 3 O 4 Br, respectively. The improvement in photocatalytic activity of composites mainly benefited from the construction of heterojunctions , which effectively inhibited the recombination of carriers. Importantly, the role of h + and •O 2 − was found to be significant in the reaction of TC. Cumulatively, a Z-scheme photocatalytic degradation mechanism of tetracycline on the BOB/NMILT composite system was proposed. The proposal of this system is of great significance for the future development of photocatalytic materials that can degrade tetracycline.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Tong Li,Caixia Cheng,Kaifeng Zhang,Jie Yang,Guangshuo Han,Xiuju Wang,Zhongpeng Wang,Liguo Wang
In this paper, the hydrophilic UiO-66-NH2 nanomaterial was synthesized by the solvent-thermal method and characterized. Then, UiO-66-NH2 was introduced into the casting membrane solution of cellulose acetate (CA) forward osmosis (FO) membrane, and CA/UiO-66-NH2 forward osmosis membrane was prepared by the phase inversion method. The optimum preparation conditions of CA/UiO-66-NH2 mixed matrix membranes were determined as follows: the content of UiO-66-NH2 was 0.4 wt%, the coagulation bath temperature was 35°C, the mixing temperature was 50°C and the heat treatment temperature was 50°C. FTIR, SEM, water contact angle and AFM were carried out on CA/UiO-66-NH2 forward osmosis membrane prepared under the best preparation conditions. Compared to the CA forward osmosis membrane, the permeability and selectivity of the CA/UiO-66-NH2 membrane were improved. The water flux and reverse salt flux of the CA/UiO-66-NH2 forward osmosis membrane reached 52.32 L/(m2·h) and 2.43 g/(m2·h), respectively. The permeability selectivity of CA membranes and CA/UiO-66-NH2 membranes did not change much during 180 min, indicating that the two membranes had good long-term stability. This study shows a potential advantage of UiO-66-NH2 as additives for improvement in the desalination performance of forward osmosis membranes.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 33
·e52810
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IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Rui Duan,Hongjuan Wu,Jiahe Li,Zhaoxi Zhou,Weihua Meng,Lei Liu,Hongqiang Qu,Jianzhong Xu
Phosphor nitrile functionalized UiO-66-NH 2 /graphene (G-U-H) was prepared combined a green mechanochemical method and microwave-assisted rapid method to improve the fire safety of epoxy resin (EP). The scanning electronic microscopy, transmission electron microscope and X-ray diffraction results indicated that the G-U-H exhibited sandwich-like hybrid structure. And the -OH from graphene nanoplatelets and -NH 2 from UiO-66-NH 2 were grafted with hexachlorocyclotriphosphazene to form covalent bonds . The obtained flame retardant was added to the EP at a different content. The flame retardancy index and cure index of EP composites were calculated, and those of EP-3 were both good. The cone calorimetry test showed that the flame retardancy of EP was improved and the flame retardant mechanism is the combination of condensed phase and gas phase with the synergistic of P, N and other elements. The physical barrier of graphene nanoplatelets and the generated more stable and denser residual char in condensed phase can effectively cut off the heat and mass transmission. In gas phase, the non-flammable gases were generated to help reduce the heat released.
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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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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 22
·4555-4566
·
IF 6.331
Wenhui Chen,Qiu Han,Yang Liu,Yiwen Wang,Fu Liu
Hyperphosphatemia, a common complication of chronic renal failure patients, is described as an excess amount of serum phosphate >4.5 mg dL−1. Current therapy for hyperphosphatemia is limited by low removal efficiency, secondary hyperparathyroidism, uremic bone disease, and the promotion of vascular and visceral calcifications. Metal organic frameworks (MOFs) have aroused great interest in the field of blood purification because of their strong specific adsorption. Herein, we prepared mixed matrix microspheres (MMMs) encapsulated NH2-MIL-101(Fe) with specific adsorption to blood phosphate. Simultaneously, a heparinoid copolymer poly (acrylic acid-sodium 4-vinylbenzenssulfonate) (P(AA-SSNa)) was incorporated to improve the hemocompatibility. The proposed MMMs exhibited excellent phosphate adsorption capacity both in aqueous and human plasma environments. They also showed comprehensive hemocompatibility e.g. low tendency of protein adsorption, low hemolysis rate and extended blood coagulation time. In general, we envision that the MMMs are potentially suitable as highly efficient hemoperfusion adsorbents for hyperphosphatemia treatment.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xiaoxiao Chen,Mengyao Liu,Lijuan Zhang,Yunshan Zhou,Enming Ping,Chunyan Ding
ZIF-67@NH 2 –SiO 2 composites were prepared by loading the metal-organic frameworks ZIF-67 on amino modified SiO 2 gel particles (NH 2 –SiO 2 , 80–100 mesh) through layer-by-layer self-assembly method. Systematic investigation on the effects of ZIF-67 loading amounts on NH 2 –SiO 2 packed stainless steel chromatographic column (specification 1.0 m×2.0 mm I.D.), the flow rate of He as carrier gas and the injection amount of mixed gas (H 2 /D 2 ) on the hydrogen isotope H 2 /D 2 separation performance at liquid nitrogen temperature, unraveled the optimal conditions for H 2 /D 2 isotope separation . The results showed that the optimal stationary phase materials under the optimized conditions can effectively separate H 2 and D 2 with separation resolution R = 1.52 and the separation time t = 10.15 min. The superior performance of the ZIF-67 is tentatively thought to be due to kinetic quantum sieving (pore size 3.3 Å) effect and chemical affinity sieving effect of Co ion in ZIF-67.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yangjie Fu,Kejie Zhang,Yi Zhang,Yanqing Cong,Qi Wang
Visible-light-active MR/NH 2 -MIL-125(Ti) homojunction was successfully synthesized via post-synthetic modification of NH 2 -MIL-125(Ti). A chromophore group (–MR) similar to the structure of methyl red, was introduced to partially replace the –NH 2 group. Using pure NH 2 -MIL-125(Ti) and MR-MIL-125(Ti) as control samples, the possible structural and optical changes were carefully studied. It was found that the lattice structure remained unchanged, while the specific surface area and band gap were in the order of NH 2 -MIL-125(Ti) > MR/NH 2 -MIL-125(Ti) > MR-MIL-125(Ti). Despite of these, MR/NH 2 -MIL-125(Ti) exhibited highest photocurrent response and lowest charge transfer resistance, which were associated with optimal photocatalytic performance. For the photocatalytic reduction of Cr(VI), the estimated rate constant on MR/NH 2 -MIL-125(Ti) was ca. 9 times and 3 times relative to that on NH 2 -MIL-125(Ti) and MR-MIL-125(Ti), respectively. Besides, 4.6 times rate enhancement can also be observed on the homojunction relative to physical mixture (MR/NH 2 -MIL-125(Ti)-PM). The boosted photocatalytic performance may be ascribed to promoted separation and transfer of photogenerated electron-hole pairs. The operating factors was optimized at acidic pH (2.0), lower catalyst dosage (0.1 g/L) and appropriate concentration of coexisting organics (2.0 mM) within the tested range. Furthermore, good stability both in photocatalytic performance and structure were also observed after 5 cyclic runs. Thus, this study report a facile way for the construction of visible-light-active MOFs, and provided a stable photocatalytic candidate for the disposal of Cr(VI)-containing wastewaters.
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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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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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