MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Yaping Li,Xianglin Sun,Yiming Tang,Yun Hau Ng,Lintao Li,Feng Jiang,Jing Wang,Weirui Chen,Laisheng Li
The coral-like BiVO 4 was successfully constructed on ZnO nanorods grown on FTO substrates to reveal exceptional photoinduced charge migration kinetics as well as the underlying photoelectrocatalytic degradation process. The orderly ZnO nanorods array accelerated the separation of photogenerated carriers, while the three-dimensional coral structure of ZnO/BiVO 4 nanocomposite increased the efficiency of light absorption and mass transfer, thus improving the photoelectrochemical properties. Fine interfacial contact between ZnO and BiVO4 led to the optimized photoelectrochemical performance with a photocurrent density of 0.29 mA/cm2 at 0 V vs . Ag/AgCl under visible light illumination (λ ≧ 420 nm), which was 3.2 times, 1.6 times of that of pristine ZnO and BiVO4. Moreover, the photoelectrocatalytic degradation efficiency of tetracycline from the ZnO/BiVO4 nanocomposite on was c. a. 84.5% and the main degradation paths were analyzed by LC-MS. Radical scavengers were employed to evaluate the capability to produce •O 2 − and •OH active species upon visible light illumination. This study elucidated the reaction mechanisms of the ZnO/BiVO4 nanocomposite during the photoelectrocatalytic degradation process.
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Journal of Materials Chemistry C
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2021
·Vol. 9
·期 30
·9492-9498
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IF 7.393
Jinmin Wang,Xin Xu,Limin Zhao,Bing Yan
Covalent organic frameworks (COFs) demonstrate a new trend in the field of chemical sensing mainly due to their potential for functional modification, defined pore environment and good chemical stability. Exploring functionalized-COF materials as chemosensors with low detection limits and high selectivity for biologically and environmentally important analytes is a campaign in this field. In this work, the incorporation of polyoxometalate (POM, Eu4W8) into the crystalline architecture a COF (EB-TFP) generates a functional composite material Eu4W8@EB-TFP. This material combines the merits of POM and COF together; it endows COF with outstanding luminescence properties and effectively broadens the sensing application of COF. It points out a new direction to employ POM-functionalized COF materials as efficient chemosensors to monitor trace amounts of Ag+ in environmental and CG (hepatocellular carcinoma biomarker) in biological systems. This work provides new insights into COF-based sensors and inspires the development of more versatile tools for analytical applications.
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Soft Matter
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2021
·Vol. 17
·期 30
·7158-7167
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IF 3.679
Hanqi Xu,Jinbo Wu,Yaying Hong,Weijia Wen
The impact of two nonionic surfactants, namely Span 20 and Span 85, on the electrorheological response and colloidal stability of urea-coated barium titanyl oxalate (BTRU)/silicone oil suspensions is investigated. We quantitatively analyze the surfactant effect on modified ER performance through the measurements of yield stress and current density, as well as the tuned suspension stability through calculation of the Turbiscan stability index (TSI) and naked-eye observations of sedimentation phenomena. The surfactant effect on particle–oil interactions and agglomeration effects is examined by measuring the permeability of silicone oil when mixed with the Span surfactant and the cluster size of particles in dispersing medium, respectively. Our results indicate that with the presence of a Span surfactant, the yield stress of the suspension exhibits a local maximum at certain Span concentrations. We hypothesize that below the optimal Span concentration, the ER properties are enhanced by the increase of the electrostatic interaction between particles. Above the limiting concentration, the ER activity is weakened by the formation of a double-layer surfactant structure that generates a steric hindrance effect. We discover that the addition of the Span surfactant favors the improvement of the particle agglomeration phenomenon, thereby promoting colloidal stability of the suspension. Consequently, in the consideration of both ER properties and suspension stability, an optimal ER fluid with the addition of 0.4 wt% Span 85 is acquired with remarkable integrated ER properties.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Hao Ying,Tingting Chen,Chenyun Zhang,Jiahui Bi,Zhonghao Li,Jingcheng Hao
The production of ammonia through electrocatalytic nitrogen reduction reaction (NRR) is environmentally friendly and energy-saving, but it still suffers from the low NH 3 yield rate and poor selectivity. Herein, enlightened by the unique solubility of Fe 3 O 4 in deep eutectic solvent (DES), we, for the first time, reported a DES-based regeneration strategy to fabricate porous Fe 3 O 4 nanosheets utilizing commercial Fe 3 O 4 powder as raw materials. The as-regenerated porous Fe 3 O 4 nanosheets exhibited satisfactory electrocatalytic performance toward NRR, affording a NH 3 yield rate of 12.09 μg h −1 mg −1 cat along with an outstanding Faradaic efficiency (FE) of 34.38% at −0.1 V versus reversible hydrogen electrode (RHE), in the 0.1 M Na 2 SO 4 electrolyte. The superior electrocatalytic activity of the as-regenerated Fe 3 O 4 nanosheets mainly resulted from their unique sheet-like morphology with large active surface area, high porosity, and abundant oxygen vacancies. Our proposed DES-based regeneration strategy opens a new avenue for the construction of high-performance electrocatalyst from commercial raw materials, holding great promise in NRR.
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高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2021
·Vol. 56
·期 10
·5230-5241
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IF 3.713
Dai-Yu Zhang,Jun-Ru Qi,Wen-Xin Jiang,Jin-Song Liao,Xiao-Quan Yang
In this study, pectin polysaccharide (SDPP) was obtained from soybean dreg (26.2% yield), and characteristics of SDPP were compared with those of soybean soluble polysaccharides (SSPS) and citrus pectin (HMP). The galacturonic acid and molecular weight of SSPS, SDPP or HMP were 11.8%, 40.6% or 70.2% and 112, 446, or 440 kDa. SDPP had similar viscosity and protein content to SSPS, and functional groups and linear structure to HMP. SSPS, SDPP or HMP differed in particle size of 260, 467 or 1195 nm and ζ–potential of −5.8, −14.6 or −23.5 mV at pH 4.0. The precipitation of acidified milk drink (AMD) was 6.31% without stabiliser or below 1.75% with 0.4% SDPP at pH 3.6–4.6. These results suggested that SDPP combines the structure and characteristic of HMP and SSPS, and AMD with SDPP had great stabilising behaviour at wider pH range (pH 3.6–4.6).
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Xiaoli Luo,Limin Chen,Jianying Yang,Shuting Li,Manting Li,Qian Mo,Yinbao Li,Xinchun Li
Methods that can directly and sensitively quantify a set of correlative substances lack of chromophores in pharmaceuticals are persistently desired. Here, by facile preparation of Pt-Pd nanoparticles/chitosan/nitrogen-doped graphene (N-Gra) nanocomposite, we establish an electroanalytical method for simultaneous detection of ascorbic acid (AA), sulfite and oxalic acid (OA) that are closely involved with Vitamin C injection, a widely-used clinical drug. One-step electrodeposition of Pt-Pd bimetallic nanoparticles on chitosan/N-Gra decorated glassy carbon electrode was proposed to construct a well-performing electrocatalyst possessing notable electrochemical activity to the electrooxidation of both sulfite and OA. The electrocatalytic ability was evidenced by the increased current response and decreased oxidation overpotential. More importantly, sufficiently electrochemical resolution of multiple oxidative peaks allowed simultaneous quantitation of the three species of interest. The peak currents measured by differential pulse voltammetry were linear to the analytical concentration of AA, sulfite, and OA, yielding good linear ranges of 2 ~ 400 μM, 8 ~ 600 μM, and 1.5 ~ 500 μM, respectively. Correspondingly, the limit of detection was 0.97 μM, 5.5 μM, and 0.84 μM. This work opens a vista for multiplex assays of pharmaceuticals, including drug principal ingredient, toxic preservative, and decomposed impurity without chromatographic separation, and thus holds promise for the overall quality control for clinical drug.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ying Sun,Xuejiang Wang,Siqing Xia,Jianfu Zhao
Biodegradable plastics have been evaluated as promising alternatives for conventional polymers in various fields. Although microplastics (MPs) have been reported as vectors for pollutants in the environment ( e.g. antibiotics), knowledge about the chemicals carrying mechanisms of degradable MPs during the biodegradation process is limited. In this study, we investigated the adsorption behavior of oxytetracycline (OTC) on polylactic acid (PLA) MPs during its biodegradation process. Scanning electron microscopy (SEM) discovered the growth of scattered rod-shaped bacteria on the surface of PLA MPs. Two-dimensional correlation spectroscopy (2D-COS) combined with Fourier transform infrared spectroscopy (FTIR) identified the breakage of ester linkages and the generation of more oxygen-containing functional groups, indicating PLA biodegradation occurred. The presence of a biofilm coating increased the OTC adsorption capacity on MPs by 20.15%, mainly due to OTC complexing with chemical functional groups existing in biofilms ( e.g. N–H functional group). More oxygen-containing functional groups were exposed on the surface of PLA MPs after removing biofilms, which further increased the adsorption quantity of OTC by 39.01% through enhanced hydrogen bonding compared with biofilm coating MPs. The adsorption quantity of OTC adsorbed onto MPs first increased and then decreased with the pH ranging from 3.0 to 9.0, which was dominated by electrostatic interaction and hydrophobic interaction. In addition, the adsorption capacity of MPs was suppressed by the presence of fulvic acid (FA) due to that the adsorbed FA blocked further OTC adsorption and OTC showed higher affinity to free FA compared with MPs. These results unravel the OTC adsorption behavior of PLA MPs undergoing microbial adhesion and degradation, which could be useful for understanding the environmental sorption behavior of degradable MPs.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Dong Li,Yuexiao Pan,Xunan Wei,Jun Lin
Red phosphors based on Mn 4+ doped fluorides emitting narrow red light under the excitation of blue GaN chips, which can help to improve the luminescence efficiency and color rendering index (CRI) of white light-emitting diodes (WLEDs). In this paper, we carried out a room-temperature synthesis method to obtain a new phosphor of CsNaGe x Sn 1-x F 6 :Mn 4+ (CNGSFM) which contains double-central ions Ge 4+ and Sn 4+ . By controlling the different ratios of the central ions Ge 4+ /Sn 4+ , the contraction and expansion of the matrix lattice CNGSF can be freely changed, which provides a new direction for exploring the trimming method of the lattice effect on the luminescence performance of phosphors. Mn 4+ in CNGSFM shows weak stability and its luminescence quenches fastly in humid environments , so that we explored a facile strategy to improve its humidity resistance. Furthermore, the quenched luminescence of the CNGSFM can be restored through surface modification. Therefore, our results not only establish the tunable mechanism between luminescence performance and microstructure, but also provide a feasible strategy to improve the humidity resistance of Mn 4+ doped double-composite fluoride phosphors.
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ACS ES&T Engineering
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2020
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IF 0
Yuxian Wang,Nuo Ren,Jiaxin Xi,Ya Liu,Tao Kong,Chunmao Chen,Yongbing Xie,Xiaoguang Duan,Shaobin Wang
High-performance and robust catalysts act as core drivers for advanced oxidation technologies for decontamination of water resources. In this study, we used a facile strategy to prepare magnetic and N-doped carbon nanotubes with cobalt encapsulation (Co–N@CNTs) to catalyze ozone for decomposition of aqueous organic pollutants. By regulating the thermal conditions during the synthesis, the derived Co–N@CNTs manifested maneuvered adsorption capabilities. The embedded Co nanoparticles (NPs) not only afforded carbon nanotubes with a magnetic property but also significantly boosted catalytic ozonation due to the synergistic coupling of the Co interface and N-doped graphitic layer. Formation of such a coordinating structure accelerated electron transfer at the interface and increased the conductivity of surface carbon to coordinate a redox reaction. Density functional theory (DFT) calculations and experimental evidence confirmed that cobalt coupled with graphene with pyridinic N dopants was the most favorable structure, which remarkably enhanced ozone adsorption and its dissociation to generate reactive oxygen species (ROS). Intriguingly, the catalytic ozonation underwent different nonradical regimes dependent on the molecular structures of target organics. In terms of ROS, surface-adsorbed atomic oxygen (*Oad) was responsible for degradation of oxalic acid, while phenolics were primarily degraded by O3 molecules and singlet oxygen (1O2). This study provides a cost-efficient and recyclable carbocatalyst for wastewater decontamination and new insights into the structure–functional relationships in carbon-based advanced oxidation processes.
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ChemElectroChem
·
2020
·Vol. 7
·期 24
·4971-4978
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IF 4.154
Jianping Zheng,Jianpo Chen,Liping Xiao,Xiaoning Cheng,Hao Cui
Graphical In the hybrid Co 3 W−WN catalyst , the tungsten cobalt alloy not only acts as a water-dissociation promoter to accelerate the Volmer step, thus improving the HER activity, but also transforms in situ into OER active species to facilitate the water-oxidation process. So, the Co 3 W−WN hybrid electrocatalyst exhibits enhanced HER and OER activities with overpotentials of 43 and 273 mV, respectively, at 10 mA cm −2 . Due to the difference of catalytic mechanisms, the design of an efficient alkaline bifunctional catalyst not only needs to organically integrate different active sites, but also has to simultaneously optimize the catalytic activity of both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Here, we propose a strategy of killing two birds with one stone to construct the efficient bifunctional electrocatalyst by simultaneously accelerating water dissociation and enhancing oxygen evolution. The self-supported tungsten nitride nanowires decorated with tungsten cobalt alloy nanoparticles (Co 3 W/WN/CC) were synthesized on the flexible carbon cloth. Co 3 W can act as both a water dissociation promoter to enhance HER activity and OER active species to facilitate water oxidation via in situ transformation, thus effectively improving the overall water splitting performance. As expected, compared with pure tungsten nitride catalysts, the hybrid electrocatalyst not only shows enhanced HER activity with an overpotential decrease from 255 to 43 mV, but also achieves an excellent OER performance with overpotential of 273 mV in 1 M KOH aqueous solution. Furthermore, by employing Co 3 W/WN/CC as cathode and anode, the overall water splitting process needs 1.582 V to drive a current density of 10 mA cm −2 and maintains without decay for 80 hours. This work expands the effective strategy for building efficient, stable and low-cost alkaline bifunctional electrocatalysts.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yanfang Shen,Jiannan Pan,Xinyue Hu,Hui-Min Wen,John Q. Xiao,Jun Hu
Nanowire arrays can be conveniently fabricated by electrodeposition methods using porous anodized alumina oxide templates. They have found applications in numerous fields. Nanotube arrays, with their hollow structure and much enhanced surface-to-volume ratio, as well as an additional tuning parameter in tube wall thickness, promise additional functions compared with nanowire arrays. Using a similar fabrication method, we have developed a facile and general method to fabricate metallic nanotubes (NTs). Using Ni NTs as a model system, the mechanism of the hydrogen-assisted NT growth was postulated and confirmed by controlling the hydrogen formation with conductive salts in an electrodeposition solution, which improves the H2 concentration but prevents the large H2 bubbles from blocking the nanochannel of a template. The controlled hydrogen generation forces the growth along the wall of nanochannels in the templates, leading to the NT formation. The magnetic properties can be controlled by the NT wall thickness, making these NTs useful for various applications.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Qizhan Zhang,Minghua Zhou,Zhicheng Lang,Xuedong Du,Jingju Cai,Lujie Han
High mineralization efficiency and low energy consumption are the core requirements for the application of electrochemical advanced oxidation processes (EAOPs) for organic pollutants degradation. Herein we reported innovative EAOPs using natural air diffusion electrode (NADE) to improve H 2 O 2 production and enhanced utilization efficiency by combination with electro-Fenton and photoelectro-Fenton (EF-PEF) for the degradation of 2,4-dichlorophenoxyacetic acid. At 0.2 and 1.2 A, the H 2 O 2 production on NADE possessed 158% and 188% of that on normal aeration electrode (AE) with the total energy consumption only 7.2% and 25.4% of that on AE, respectively. Such excellent H 2 O 2 production performance on NADE was attributed to ultra-high oxygen mass transfer efficiency and the feature of not requiring aeration, which reduced energy consumption greatly. A new H 2 O 2 utilization efficiency (HUE) evaluation index including decomposition ratio, conversion efficiency and total utilization efficiency of H 2 O 2 was proposed, demonstrating that PEF had a higher HUE than EF but not cost-effective due to a higher energy consumption. EF-PEF was thus proposed to upgrade the traditional PEF, which reduced energy consumption while maintained high mineralization efficiency. The HUE in EF-PEF process was greatly improved and superior to most reported EAOPs in literatures, which explained the high mineralization efficiency (78%–87%) with an extremely low energy consumption (0.065–0.167 kWh (g TOC) −1 ) even an order of magnitude lower than that in the literatures. This work enlightened the importance of two strategies of improving both H 2 O 2 production and utilization efficiency to maintain high mineralization efficiency in H 2 O 2 based EAOPs.
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