APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Ranran Yuan,Cailiang Yue,Jinli Qiu,Fuqiang Liu,Aimin Li
TiO 2 @NH 2 -MIL-88B(Fe) heterostructures (TMFe-x) were successfully synthesized and used in an efficient sunlight-driven reduction towards Cr(VI) in a neutral aqueous media. Further, the prepared TMFe-x heterostructures exhibited higher photocatalytic activity when compared with those exhibited by pure TiO 2 and NH 2 -MIL-88B(Fe) under simulated sunlight irradiation. The optical TiO 2 modification content was determined to be 10 wt.% (TMFe-b), with 98.6% Cr(VI) being converted to Cr(III) within 35 min using ammonium oxalate as the hole scavenger at pH = 7. In neutral conditions, the kinetic rate constant (0.0878 min −1 ) was five times larger than the published values. Additionally, the photocatalytic performance of TMFe-b was maintained and Fe leaching was observed to be negligible after the completion of four reaction cycles. The superior photocatalytic property can be attributed to the high photoelectron-hole separation and migration efficiency. Subsequently, TMFe-b achieved Cr(VI) reduction under neutral conditions by capturing hydrogen from the water molecules or the hole scavengers. The photoelectrons and superoxide radicals were the main active species. Furthermore, TMFe-b was able to efficiently eliminate various pollutants through photocatalytic oxidation and reduction. This study suggests a novel strategy for the preparation of environmentally stable and efficient MOF-based photocatalysts to efficiently eliminate various pollutants. Further, there is a huge potential for the practical application of this technology to water purification .
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BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Pan Zhang,Tingting Sun,Shengzhong Rong,Dongdong Zeng,Hongwei Yu,Ze Zhang,Dong Chang,Hongzhi Pan
Long-term accumulation of organophosphate pesticides in environment presents a potential hazard to human and animal health. Towards this, a highly sensitive amperometric AChE-biosensor based on conjugated polymer and Ag-rGO-NH 2 nanocomposite has been successfully developed. First, 4, 7-di (furan-2-yl) benzo thiadiazole (FBThF) was electrochemically polymerized on the electrode surface. Then, Ag-rGO-NH 2 nanocomposite and acetylcholinesterase (AChE) are modified on the polymer membrane surface. In this way, a novel amperometric AChE-biosensor was successfully prepared. The as-prepared biosensor possessed excellent conductivity, catalytic activity , and biocompatibility which were attributed to the synergistic effects of poly(FBThF) and Ag-rGO-NH 2 and provided a hydrophilic surface for AChE adhesion. Under optimized conductions, the linear range was 0.099–9.9 μg L −1 with a regression coefficient of 0.9947 for malathion , 0.0206–2.06 μg L −1 with a regression coefficient of 0.9969 for trichlorfon . The detection limit is calculated to be about 0.032 μg L −1 for malathion and 0.001 μg L −1 for trichlorfon (S/N = 3). Moreover, the biosensor exhibited acceptable reproducibility and long-term stability, which makes it possible to provide a novel and promising tool for analysis of organophosphate pesticides.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Shipeng Wan,Man Ou,Qin Zhong,Xinming Wang
Base-on the excellent optoelectronic properties, perovskite CsPbBr 3 quantum dots (QDs) have been used on perovskite solar cells and LED devices, but little research has been focused on photochemical CO 2 reduction due to their poor moisture stability. Coincidentally, metal-organic frameworks (MOFs) materials have received tremendous attention for sustainable clean energy and environmental remediation. However, the design of excellent performed MOFs is still indispensable. Therefore, the CsPbBr 3 QDs/UiO-66(NH 2 ) nanocomposites that combine the advantages of CsPbBr 3 QDs and UiO-66(NH 2 ) have been successfully designed and fabricated for the first time. Then we employ the nanocomposites as photocatalysts to convert CO 2 to chemical fuels in nonaqueous media. The resultant nanocomposites exhibit significantly improved photocatalytic activity for CO 2 reduction. When CsPbBr 3 QDs content is 15 wt%, the amount of CO can reach 98.57 μmol·g −1 . The remarkable photocatalytic performance could be ascribed to the improved electron extraction and transfer between UiO-66(NH 2 ) and CsPbBr 3 QDs, large accessible specific surface area and enhanced visible light absorption capacity. Moreover, the nanojunction shows excellent reusability for photocatalytic CO 2 reduction. This work might supply new pathway to utilize halide perovskite QDs/MOF nanocomposite in energy conversion and environmental remediation.
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MATERIALS & DESIGN
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2019
·
IF 5.77
Zhen Zhang,Ming Cao,Peng Chen,Bin Yang,Bin Wu,Jibin Miao,Ru Xia,Jiasheng Qian
In this study, selective distribution of amino-functionalized multi-walled carbon nanotubes (MWCNTs-NH 2 ) in poly (vinylidene fluoride)/polyamide 6 (PA6/PVDF) blends is achieved via the mixing process and subsequent migration. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selective extraction confirmed that MWCNTs-NH 2 could migrate from the PVDF phase to the two-phase interface. The composites could significantly improve thermal/electrical conduction capacity of the composites with low dose. The thermal infrared characterization also indicated that the composites have better heat absorption capability and dissipation performance due to the good thermal conductivity . Rheological measurements exhibited the MWCNTs-NH 2 could form network structure with a low content at the interface of the composites. Moreover, the addition of MWCNTs-NH 2 led to an improvement in the mechanical properties compared with the pure PA6/PVDF blends. These results manifest that the thermal/electrical conductivity and mechanical performance of the composites with low filler loading can be significantly improved by selective distribution of MWCNTs-NH 2 through controlling the migration process.
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Journal of Cleaner Production
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2019
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IF 6.395
Likang Fu,Shixing Wang,Guo Lin,Libo Zhang,Qiming Liu,Houhuang Zhou,Chenxia Kang,Shuyun Wan,Hongwei Li,Sheng Wen
A new metal organic framework UiO-66-RSA (UiO-66 with hydroxyl) was prepared by the post-modification of UiO-66-NH 2 (UiO-66 with amino) with resorcyl aldehyde and was employed for the efficient and selective separation and removal of Pb(II) in aqueous media . The maximum adsorption amount of UiO-66-RSA was 189.8 mg/g at an optimal pH of 4. The adsorption isotherm and kinetic were well described by Langmuir/Dubinin-Radushkevich and pseudo-second-order models respectively. Adsorption process was monolayer chemisorption . UiO-66-RSA was regenerated by thiourea/nitric acid and the removal rate was only decreased by 3.7% after five successive cycles. The analysis of X-ray photoelectron spectroscopy suggested the adsorption mechanism lay on the complexation reaction between hydroxyl/nitrogen-containing groups and Pb(II). The UiO-66-RSA bound Pb(II) by forming double/quadri coordinated complexes. Compared with a multitude of usual metal ions , viz., Zn(II), Co(IV), Ni(II), Mg(II), Cd(II), Cu(II) and Ca(II), the Pb(II) could be absorbed selectively by UiO-66-RSA. The results indicated that the UiO-66-RSA sorbent could be of great potential in the removal of Pb(II) from aqueous solutions.
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Journal of Physical Chemistry C
·
2013
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IF 4.814
Yongfeng Liu,Chao Li,Bo Li,Mingxia Gao,Hongge Pan
The hydrogen storage properties and mechanisms of the Mg(NH2)2–2LiH system with potassium halides (KF, KCl, KBr, and KI) were investigated and discussed. The results show that the KF-added sample exhibits superior hydrogen storage properties as ∼5.0 wt % of hydrogen can be reversibly stored in the 0.08KF-added sample via a two-stage reaction with an onset dehydrogenation temperature of 80 °C. However, hydrogen storage behaviors of the samples with KCl, KBr, and KI remain almost unchanged. The fact that KF can readily react with LiH to convert to KH and LiF due to the favorable thermodynamics during ball milling should be the primary reason for its significant effects, as the presence of KH provides a synergetic thermodynamic and kinetic destabilization in the hydrogen storage reaction of the Mg(NH2)2–2LiH system by declining the activation energy of the first-step dehydrogenation as a catalyst and reducing the desorption enthalpy change of the second step as a reactant. The understanding on the role played by KF sheds light on how to further decrease the operating temperature and enhance the hydrogen storage kinetics of the metal–N–H system.
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CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Hai Tao Xing,Jian Hua Chen,Xue Sun,Yi Hong Huang,Zhen Bo Su,Shi Rong Hu,Wen Weng,Shun Xing Li,Hong Xu Guo,Wen Bing Wu,Ya Shan He,Fei Ming Li,Yang Huang
Graphene oxide nanosheets (GO) were dispersed and crosslinked with a water soluble polymer, namely poly(allylamine hydrochloride) (PAH) with high amine density, to prepared a novel PAH-GO composite, which was used for removing Cu(II) ions from aqueous solutions. The physico-chemical properties of PAH-GO composites were investigated by transmission electron microscopy, thermogravimetric analysis, etc. Adsorption experiments indicated that adsorption process was strongly dependent on pH and temperature, however weakly dependent on ionic strength. The maximum adsorption capacity was about 349.03 mg/g higher than that of currently reported. Competitive adsorption studies for the ternary system suggested that the adsorption of PAH-GO composite for Cu(II) ions was much preferable to Cd(II) and Ni(II) ions. Thermodynamic parameters suggested that adsorptions were endothermic and spontaneous processes. The Langmuir adsorption isotherm was applicable fit adsorption process, and adsorption kinetic process could be described by the pseudo-second-order model. Adsorption–desorption results showed that the reusability of PAH-GO composite was encouraging. Based on the results obtained, we conclude that PAH-GO composite can be an effective and potential adsorbent for removing Cu(II) ions from an aqueous solution.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Yanghe Fu,Long Sun,Huan Yang,Lai Xu,Fumin Zhang,Weidong Zhu
The Ni-doped NH 2 -MIL-125(Ti) catalyst was developed for the photocatalytic aerobic oxidation of aromatic alcohols upon visible light irradiation. The results show that different aromatic alcohols can be effectively transformed to their corresponding aldehydes with almost absolute selectivity using O 2 as the oxidant over Ni-doped NH 2 -MIL-125(Ti) upon visible light irradiation. Compared with the parent catalyst NH 2 -MIL-125(Ti), Ni-doped NH 2 -MIL-125(Ti) exhibits a significantly enhanced photocatalytic activity for the selective oxidation of aromatic alcohols. Preliminary studies indicate that the doping of Ni nanoparticles into NH 2 -MIL-125(Ti) could improve the visible-light harvesting, charge-separation, and electron-transport of the resultant catalyst, leading to the enhanced photocatalytic activity. The current work provides some guidance in the development of MOF-based photocatalysts for organic syntheses.
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Journal of Materials Chemistry C
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2017
·Vol. 5
·期 36
·9465-9471
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IF 5.256
Ting Lu,Hongjie Song,Xiaoqun Dong,Jianyu Hu,Yi Lv
NH2-MIL-53(Al) nanorods studded with F− were successfully synthesized via coordination modulation with HF as a modulator. The investigation of the growth mechanism pointed out that F− plays a key role in the formation process. The incorporation of F− into the framework of NH2-MIL-53(Al) not only made the crystal morphology tunable but also magnified the fluorescence enhancement performance of NH2-MIL-53(Al) in water vapor, based on which a highly efficient humidity sensor was fabricated. Among different kinds of humidity sensors, the present sensing system stood out due to its fast response rate, good sensitivity and high selectivity with a low detection limit of 0.6 μg mL−1 (S/N = 3) and a wide detection range from 4 to 40 μg mL−1. On the other hand, a majority of the conventional electronic humidity sensors seriously suffered from temperature dependence, while the present sensing system got over this disadvantage. Therefore, the NH2-MIL-53(Al) nanorod layer-based fluorescence sensing system has the potential for application in the real-time monitoring of humidity under ambient conditions.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2016
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IF 3.902
Wei Zhuang,Linjiao He,Jiahua Zhu,Jianwei Zheng,Xiaojing Liu,Yihui Dong,Jinglan Wu,Jingwei Zhou,Yong Chen,Hanjie Ying
The use of graphene oxide (GO) nanosheets for functional enzyme support has attracted intensive interest owing to their unique planar structure and intriguing physical and chemical properties. However, the detailed effects of the interface properties of GO and its functionalized derivatives on active biomolecules are not well understood. We immobilize nuclease P 1 , a common industrial nucleic acid production enzyme, on pristine and amino poly(ethylene glycol) (PEG-NH 2 ) modified GO nanosheets with interface property heterogeneity using two approaches, physical adsorption and chemical crosslinking. It is demonstrated that nuclease P 1 could be stable immobilized on the surface of pristine GO by physical adsorption and on the edge of modified GO nanosheets by chemical crosslinking. The resultant loading capacity of nuclease P 1 on pristine GO is as high as 6.45 mg/mg as a consequence of strong electrostatic and hydrophobic interactions between the enzyme and carrier. However, it is determined that the acid resistance, thermal stability, reusability and degradation efficiency of the immobilized enzyme on PEG-NH 2 -modified GO are obviously improved compared to those of the enzyme immobilized on pristine GO. The enhanced catalytic behavior demonstrates that GO and its derivatives have great potential in efficient biocatalytic systems.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Juan Yang,Lite Yang,Huili Ye,Faqiong Zhao,Baizhao Zeng
In this work, highly dispersed AuPd alloy nanoparticles (NPs, 3–6 nm) decorated amino-functionalized Zr(IV)-based metal–organic framework (i.e. UiO-66-NH 2 ) was prepared via a novel adsorption/reduction method in ethanol-water solution. In this process, the UiO-66-NH 2 acted as both supporting platform and protective agent. The pores of UiO-66-NH 2 could limit the aggregation and migration of AuPd alloy NPs. The resulting AuPd/UiO-66-NH 2 catalyst possessed large specific surface area and excellent stability and dispersity in aqueous media. When it was used to construct a nitrite sensor, the composite material exhibited higher catalytic activity than the metal counterparts (i.e., Au/UiO-66-NH 2 and Pd/UiO-66-NH 2 ) due to the strong metallic synergistic effect. The electrochemical study demonstrated that the AuPd/UiO-66-NH 2 based sensor had an extended linear response concentration range of 0.05–5666 μ M for nitrite detection, with a detection limit of 0.01 μ M. It was successfully applied to determine nitrite in sausage and pickle samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Yanyan Xing,Mengke Tian,Ruoman Ji,Ting Wang,Xiaohong Hou
The immobilization of bovine serum albumin (BSA) with high efficiency, good reproducibility and stability for chiral separation has attracted much attention in the medicinal field. BSA was immobilized into MIL-101(Cr) by three ways for efficient chiral separation in this research. MIL-101(Cr)@BSA was firstly prepared by adsorption, NH 2 -MIL-101(Cr) ⊂ BSA by direct bonding, and NH 2 -MIL-101(Cr) ⊂ Glu ⊂ BSA by glutaraldehyde crosslinking bonding. Compared to the other two materials, NH 2 -MIL-101(Cr) ⊂ BSA as a new enantioselective separator, with the most BSA loading rate of 437.6 mg g −1 exhibited excellent chiral separation performances and succeeded in realizing a complete chiral separation of racemic 1–phenylethanol within 14 s. It was found that the NH 2 -MIL-101(Cr) ⊂ BSA was more strongly bound to R -1-phenylethanol and the ee value could reach 100 % when the material was added in three batches. The different interactions between BSA and racemates mainly including hydrogen bonding, hydrophobic interaction and π-π interaction were revealed by the molecular docking studies, especially hydrogen bonding, accounting for the observed selective chiral recognition capacity of racemic 1–phenylethanol of NH 2 -MIL-101(Cr) ⊂ BSA. Moreover, both of NH 2 -MIL-101(Cr) ⊂ BSA and NH 2 -MIL-101(Cr) ⊂ Glu ⊂ BSA showed excellent stability and reusability. This combination of theory and experiment provided a clearer basis for other researchers to have different requirements for protein immobilization, and provided new ideas and methods for the development of chiral selectors.
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