CHEMOSPHERE
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2020
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IF 5.778
Jiaxin Li,Mo Li,Da Li,Qinxue Wen,Zhiqiang Chen
Coal gasification wastewater (CGW) contains a large amount of toxic pollutants , which seriously affects the subsequent biochemical treatment. In order to investigate the efficiency of electrocatalytic oxidation on pretreatment of CGW, lead dioxide electrodes doped with PEG and Bi were successfully prepared. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were comprehensively used to characterize the lead dioxide electrode and the electrochemical performance was also tested by linear sweep voltammetry curve, cyclic voltammetry curve and AC impedance. Biodegradability and toxicity of CGW were evaluated by dehydrogenase activity and acute toxicity, respectively. Results showed that the doping of PEG and Bi significantly improved the electrochemical performance and catalytic oxidation performance of lead dioxide electrodes. The degradation rate of phenol by Sn–Sb/PbO 2 (PEG + Bi) electrode were 1.57 times of that by pure lead dioxide electrode. The removal of TOC and total phenols were 53.2% and 82.7%, respectively at 120 min under 40 mA cm −2 by Sn–Sb/PbO 2 (PEG + Bi) electrode. The changes of biodegradability, biological toxicity and by-products were analyzed. Furthermore, 3,5-dimethylphenol was used as characteristic pollutant to study the degradation mechanism of phenolic pollutants in electrocatalytic system. According to the intermediate products detected by GC-MS, possible degradation pathways in electrocatalytic system were proposed.
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PubMed
高影响因子
Journal of Energy Chemistry
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2020
·
IF 7.216
Zi-Juan Wang,Mi-Xue Jin,Lu Zhang,Ai-Jun Wang,Jiu-Ju Feng
As a representative type of self-supported templates, cyano-bridged cyanogels provide ideal plateaus for synthesis of three-dimensional (3D) nanostructures. Herein, 3D pomegranate-like Fe-doped NiCo nanoassemblies (3D PG-NiCoFe NAs) were synthesized via facile one-step bi-component cyanogel reduction with NaBH 4 as the reducing agent. Specifically, the influence of the incorporated Fe amount was carefully investigated by finely adjusting the feeding molar ratios of the Ni/Co/Fe atoms in the precursors. By virtue of the unique structure and enriched oxygen vacancies originated from well-modulated electronic structures, the 3D PG-NiCoFe-211 NAs exhibited outstanding electrocatalytic performances for oxygen evolution reaction (OER) in alkaline solution, outperforming commercial RuO 2 catalyst. The current incorporation of foreign metal atom into host material provides some valuable insights into design and synthesis of metal-based nanocatalysts for constructing practical water splitting devices.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2020
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IF 3.333
Qikun Wei,Lan Bai,Xiaomei Qin,Chunyan Hu,Lei Li,Wei Jiang,Fei Song,Yuzhong Wang
The adsorption capacity of existing β-CD-based adsorbents is generally restrained by the limited dimension of β-CD's inherent cavity. To find an effective way to expand the inclusion/adsorption capacity of β-CD, a series of N-containing groups, amine with straight chain, imidazole with rigid five-membered ring and pyridine with rigid six-membered ring, are firstly utilized to alkylate the secondary rim of β-CD through the thiol-Michael addition. The capsulation ability of the resultant β-CD derivatives are compared and the β-CD derivatives appended with aromatic imidazole or pyridine provide extremely rich host surroundings for loading Rhodamine B (RB), which is identified by the 1 H NMR titration and UV–Vis spectroscopy. The bi-functional adsorbents correlative to those β-CD derivatives are then synthesized by the polymerization of vinylated β-CD and the corresponding vinyl N-containing monomers , and applied to remove RB and Cd (II) from the aqueous condition. Governed by multiple factors such as porosity, surface charge and binding affinity , the imidazole modified β-CD adsorbent revealed the best adsorption efficiency for organic dyes and metal ions , in both single- and bi-component solutions. Our work provides effective strategy and reliable basis for the design and fabrication of β-CD-based materials with high capacity and multi-functionality.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 14
·11276-11285
·
IF 2.22
Deng Yuehong,Zhou Yi,Tang Haiqin,Xu Yifeng,Tan Yawen,Zou Hao,Xiang Ye
In this work, Bi spheres were deposited on bulk WO 3 ·0.33H 2 O and TiO 2 (P25) nanoparticles to form Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction material for the first time by a simple hydrothermal method. The as-prepared materials were comprehensively characterized by XRD, XPS, SEM, TEM, UV–Vis DRS, BET surface area, EIS, and Mott-Schottky analysis. The ternary Bi/TiO 2 /WO 3 ·0.33H 2 O composites exhibited superior degradation efficiency for RhB than pure WO 3 ·0.33H 2 O, TiO 2 (P25), and their binary composites. The degradation rate reached 99.84% after 30 min under simulated sunlight. The enhancement of photocatalytic activity could be attributed to the Z-scheme heterojunction system with metal Bi as an electronic medium, which greatly enhanced the efficiency of charge separation. This report demonstrated that Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction photocatalytic material has potential application value in dye wastewater treatment.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
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IF 7.183
Jingge Ju,Zongjie Li,Yi Lv,Mengyao Liu,Kaouthar Fejjari,Weimin Kang,Yuan Liao
Membrane distillation (MD) is an attractive membrane process for seawater and brine water desalination. One of the main obstacles for MD application is the absence of an effective MD membrane with high water permeability and an excellent salt rejection. This work proposes a novel design strategy of hydrophobic/hydrophilic bi-component membranes for MD by electrospinning and calcination . Unlike the conventional dual-layer hydrophobic/hydrophilic membranes, the bi-component membrane developed in this work is composed of multiple layers of hydrophilic polyimide (PI) nanofibers and hydrophobic polytetrafluoroethylene (PTFE) microclusters, which interweave with each other in the entire membrane. The optimal hydrophobic/hydrophilic bi-component membrane #PTFE/PI-2 shows robust three-dimensional (3D) superhydrophobic and self-cleaning properties. It exhibits a highly competitive permeation flux of 42 ± 3 L m −2 h −1 and an excellent salt rejection above 99.9% in a 400-h continuous DCMD operation when the feed solution was synthetic seawater with a NaCl concentration of 3.5 wt% at 60 °C. Moreover, it is able to achieve an outstanding water flux of 40 ± 2 L m −2 h −1 and a salt rejection over 99.9% when the feed solution was brine water with a NaCl concentration of 25 wt%. The high vapor permeability of #PTFE/PI-2 should be attributed to the high membrane porosity, negligible mass transfer resistance of PI nanofibers and more effective water evaporation area on its superhydrophobic surface. Meanwhile, the excellent anti-wetting property should be due to a unique 3D superhydrophobicity constructed by multiple layers of PTFE microclusters.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Binrong Li,Yanhua Cui,Yonghai Feng,Chundu Wu,Yongsheng Yan,Minjia Meng
The directional design of interfacial defects is a promising way to promote charge separation but simultaneously a great challenge due to their random formation in heterojunction. Herein, an alternative Bi 12 O 17 Cl 2 /Bi 2 WO 6 heterojunction with interfacial defects formed spontaneously is prepared by controlling the growth of Bi 2 WO 6 on the edges of Bi 12 O 17 Cl 2 nanobelts via ion exchange process. These interfacial defects can efficiently increase the carrier density and serve as charge separation centers to extend the lifetime of carriers and activate O 2 to O 2 − and further to OH. The zigzag interfaces and irregular edges facilitate the interaction between active sites and reactants. The heterojunction morphology and the interfacial defect concentration can be controlled by tuning the solvothermal time. Consequently, the optimal Bi 12 O 17 Cl 2 /Bi 2 WO 6 heterojunction exhibits significantly enhanced visible light photocatalytic performance toward the degradation of phenols, antibiotics and dyes as compared to that of mono-Bi Bi 12 O 17 Cl 2 and Bi 2 WO 6 photocatalyst.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Tong Huang,Guangwei He,Jiandang Xue,Obed Otoo,Xueyi He,Haifei Jiang,Junfeng Zhang,Yan Yin,Zhongyi Jiang,John C. Douglin,Dario R. Dekel,Michael D. Guiver
Combining two facile methods, spinodal blending and self-crosslinking by chloromethyl groups are jointly utilized in fabricating alkaline anion exchange membranes (AEMs). Highly and moderately chloromethylated poly(ether ether ketone)s and sub-equimolar (to chloromethyl) amounts of 1-methylimidazole are mixed and reacted to form blend AEMs. Nanoscale bi-continuous phase separated morphologies are obtained due to spinodal decomposition. Subsequent heat treatment triggers self-crosslinking of the AEMs arising from residual chloromethyl groups in membranes. Compared with unblended and uncrosslinked AEMs having similar ion exchange capacity (IEC), the ion conductivity of the present AEMs is increased by 45.4% in water and 113% in 95% RH at 60 °C. Dimensional and alkaline stabilities of AEMs are also enhanced by the self-crosslinking, i.e., the swelling ratio decreases by 50.3% at 60 °C and the residual conductivity increases by 26.3% after alkaline treatment in 1 M NaOH at 60 °C. Interestingly, individual spinodal blending or self-crosslinking are found ineffective in overcoming the trade-off between AEM conductivity and stability, while a combination of both methods leads to a simultaneous improvement in conductivity and membrane stability.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Gongduan Fan,Rongsheng Ning,Jing Luo,Jin Zhang,Pei Hua,Yang Guo,Zhongsheng Li
Naproxen (NPX) as one of the typical pharmaceuticals and personal care products (PPCPs) has been constantly detected in aquatic environment recently which has potentially hazard to the human health and ecosystem. However, the practical applicability of photocatalysts in degradation of NPX is still restricted by challenges that most nanomaterials need to be stimulated by ultraviolet light and their limited photocatalytic activity under visible light. Therefore, we synthesized bismuth titanate nanobulks (Bi-TNB) through the two-step method of hydrothermal-calcining. The crystal structure, morphology, UV–vis diffuse reflectance spectra and surface adsorption performance of the as-prepared were investigated by XRD, SEM, UV–vis and BET. Several parameters which might influence the degradation efficiency were studied including initial NPX concentration, catalyst dosage, solution pH and concentration of anions, cations and humus. The results indicated that more than 99.9% of NPX (0.25 mg/L) was removed by Bi-TNB (0.5 g/L) at pH = 7. Reactive species scavenging experiments indicated that h + and O 2 ·− were the dominant active species involved the degradation of NPX. In photodegradation process, NPX was firstly decarboxylated and then further photocatalytic oxidized to form carboxylic acids of lower molecular weights and would be finally transformed into CO 2 and H 2 O. PPCPs coexistence experiment showed that acetaminophen would hinder the removal of NPX by Bi-TNB. Both the reaction in different water matrices and degradation under the condition of sunlight indicated that Bi-TNB could be applied in degradation of NPX in environmental water systems. This study provides a new strategy for enhancing material photocatalytic performance to be used in practical applications.
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高影响因子
Journal of CO2 Utilization
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2019
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IF 5.189
Jing Chang,Chengming Hou,Donghai Wan,Xiuli Zhang,Bin Xu,Hongjing Tian,Xia Wang,Qingjie Guo
An alcoholamine, 2-[2-(dimethylamino)ethoxy]ethanol (DMAEE), was co-tethered with pentaethylenehexamine (PEHA) on the surfaces of the flue gas desulfurized gypsum (FGDG) carriers to synthesize a solid bi-amine adsorbent. The effects of temperature, loading of the blended amines, mass ratio of DMAEE to PEHA, CO 2 partial pressure on the CO 2 adsorption performance were discussed. The water of hydration contained in the FGDG carriers promoted the CO 2 adsorption capacity of the bi-amine adsorbent. Both the breakthrough time and the saturation adsorption capacity of the bi-amine adsorbent were distinctly higher than the DMAEE or PEHA singly tethered adsorbents. The adsorption capacity of the bi-amine adsorbent decreased by only 1.86% over twelve cycles. The isosteric heat of adsorption Q s t and the mean free energy of adsorption E f e was determined and both the values indicated that the adsorption was primarily chemisorption. In the kinetics analysis, Avrami model fitted best with the measured adsorption capacity. With the aid of the 13 C–NMR quantitative analysis results, the CO 2 adsorption mechanism of the bi-amine adsorbent in the presence of the water of hydration was revealed. For the bi-amine adsorbents supported on some porous carriers, FGDG particles were testified to replace up to 7 wt.% of montmorillonite clay or 7 wt.% of MCM–41 zeolite or 10.5 wt.% of ZSM–5 zeolite without any decrease in the CO 2 adsorption capacity.
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高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 11
·118201
·
IF 1.7
Wei Jin,Liyuan Zhang,Wenjing Zhang,Qian Sun,Dekai Zhang,Hui Miao,Xiaoyun Hu
As a traditional n-type semiconductor, TiO2 has good UV absorption ability and stable physical and chemical properties. However, its wide band gap and low oxygen evolution reaction (OER) activity limit its application in the field of photoelectrochemical (PEC) water splitting. In this work, a type-II TiO2/CuNi2S4 heterojunction photoanode is successfully constructed, which expanded the light absorption range to visible and enhanced the OER activity. Firstly, TiO2 nanotubes (NTs) thin films are prepared on Ti substrates by two-step anodization, and then the bi-functional electrocatalytic material CuNi2S4 is grown on TiO2 NTs in the shape of nanosheets (NSs) in situ by solvothermal method. As a bi-functional electrocatalytic material, CuNi2S4 has good visible light absorption property as well as OER catalytic activity. Compared with TiO2, the IPCE value of TiO2/CuNi2S4 is 2.59% at 635 nm, and that of TiO2 is a mere 0.002%. The separation efficiency and injection efficiency increase from 2.49% and 31.52% to 3.61% and 87.77%, respectively. At 1.23 V vs. RHE, the maximum photocurrent density is 0.26 mA/cm2, which is 2.6 times than that of TiO2 (0.11 mA/cm2), and can be maintained at 0.25 mA/cm2 for at least 2 h under light illumination. Moreover, a hydrogen production rate of 4.21 μmol⋅cm−2⋅h−1 is achieved within 2 h. This work provides a new idea for the application of TiO2 in the field of PEC water splitting and the construction of efficient and stable photoelectronic devices.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Z.C. Yao,W.B. Dai,J. Luo,K. Nie,M. Xu
Several series of novel broad band white light emitting Bi/Tb/Eu tridoped in multiple lattice sites of single-phase Sr 3 YB 3 O 9 (SYBO) borate phosphors, which covered almost all visible range through mixing the separate blue, green and red emissions from dopants of Bi, Tb and Eu, respectively, were successfully obtained by using the facile and conventional solid-state reaction method under air condition. Rietveld refinements based on XRD data together with the combination match of charge and ion radius for dopants of Bi, Tb, Eu and lattice cations of Sr, Y and B show that Bi is more inclined to replace the Sr site while Tb/Eu are more likely to enter the Y site, respectively. Through spectrum analysis of photoluminescence excitation (PLE), PL and decay lifetime, the efficient energy transfer (ET) from the Bi to both Tb and Eu, and from Tb to Eu are all testified via the dipole-dipole interactions, indicating that the non-rare-earth activator Bi is acting both as the blue luminescence center and ET sensitizer, while the Tb contributes both as ET bridge and green luminescence center to better connect the Bi and Eu. The optimal tridoped white emission SYBO phosphor appears good thermal stability, which could continue to have its PL intensity above 75% at 150 °C as compared with the original room temperature PL intensity. Altogether, the single-component SYBO:Bi/Tb/Eu phosphor could be well served as potential white light phosphor for n -UV pumped w LED devices.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Jianyu Zhang,Yintao Zhang,Cheng Yang,Xueliang Jiang,Wensheng Tian,Yanyu Li,Runlu Liu,Zhixin Chen,Hui Pan,Shenmin Zhu
With the rapid development of modern electronic devices, materials having high thermal conductivities (TCs) both in in-plane and through-plane directions are specially needed for thermal management. Whereas, the construction of efficient thermal-conductive pathways in bi-directions is still a challenge. Herein, a facile gel-drying approach is developed, achieving the formation of bi-directional pathways with the assistance of a dual-network structure. During the process, cellulose nanocrystal (CNC) with a high intrinsic TC was mixed with gellable cellulose (CNF) to form CNF/2CNC dispersion which was then used as a matrix. Reduced graphene oxide (RGO) foam with a network structure was used as a filler. The RGO network was tightly wrapped by the formed CNF/2CNC cross-linking network, resulting in a hydrogel with a dual-network structure. After drying, the resultant RGO-foam-CNF/2CNC film not only has a long-range orientation path in the horizontal direction, but also maintained a connected path in the vertical direction. The resultant film with 18.5 wt% RGO exhibited high TCs of 14.06 W·m −1 ·K −1 and 2.47 W·m −1 ·K −1 simultaneous for in-plane and through-plane directions, which is 21.6 times and 9.88 times higher than those of a typical CNF film, respectively. This strategy offers a new avenue for the designs of soft, cuttable, environmentally friendly polymer composite films with high TCs in bi-directions.
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