JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Meiqiang Cai,Yu Zhang,Chunying Dong,Wentao Wu,Qian Wang,Zhijun Song,Yuejing Shi,Liguang Wu,Micong Jin,Dionysios D. Dionysiou,Zongsu Wei
The heterogeneous catalytic process has been under development for aqueous pollutant degradation , yet electron transfer efficiency often limits the effectiveness of catalytic reactions . In this study, a novel composite material, manganese doped iron–carbon (Mn–Fe–C), was tailor designed to promote the catalytic electron transfer. The Mn–Fe–C composite, synthesized via a facile carbothermal reduction method, was characterized and evaluated for its performance to activate persulfate (PS) and degrade Rhodamine Blue (RhB) dye under different pH, catalyst dosages, PS dosages, and pollutant concentrations . Electron spin resonance, along with quenching results by ethanol, tert -butanol, phenol , nitrobenzene and benzoquinone , indicated that surface bounded SO 4 •− was the main contributor for RhB degradation, while the roles of aqueous SO 4 •− and • OH were very minor. Through characterization by XRD, XPS and FTIR analysis, it was determined that the electron transfer during activation of PS was accelerated by the oxygen functional groups on catalyst surface and the promoted redox cycle of Fe 3+ and Fe 2+ by Mn. Finally, the Mn–Fe–C composite catalyst exhibited an excellent reusability and stability with negligible leached Fe and Mn ions in solutions. Results of this study provide a promising design for heterogeneous catalysts that can effectively activate PS to remove organic pollutants from water at circumneutral pH conditions.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Chongbo Cheng,Pengfei Li,Wenbing Yu,Dekui Shen,Xiaoxiang Jiang,Sai Gu
Lignin containing numerous phenylpropane units is considered to be a renewable and abundant resource for the production of value-added aromatic chemicals. A series of nonprecious metal/bimetallic catalysts were prepared for the catalytic hydrogenolysis of organosolv poplar lignin (OPL) in ethanol/isopropanol solvent in this work. Effects of Ni/C, Cu/C, NiCu/C, and NiW/C catalysts on OPL depolymerization were investigated, where the NiCu/C catalyst was found to be optimal for the conversion of OPL to phenolic monomers at a yield of 63.4 wt % at 270 °C for 4 h without external H2. The synergistic effect of mixed solvent was remarkable during the catalytic hydrogenolysis process, leading to the increased yield of monomer products. The catalytic process of OPL conversion and possible reaction route of ethanol/isopropanol solvent were proposed with regard to the analysis of products and fresh/spent catalysts. The effects of reaction temperature, reaction time, catalyst recyclability, solvent recyclability, and feedstock adaptability were investigated in view of bio-oil and monomer yields. This work provides an economical and sustainable method for the efficient conversion of lignin to high-value chemicals.
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Xiaoyu Zhang,Huabing Yang,Junping Zheng,Nan Jiang,Guangjun Sun,Xinkun Bao,Aizhen Lin,Hongtao Liu
This study was designed to explore the improvement of chitosan oligosaccharides (COS) on constipation through regulation of gut microbiota. Here, we proved that COS treatment profoundly boosted intestinal motility, restrained inflammatory responses, improved water-electrolyte metabolism and prevented gut barrier damage in constipated mice induced by loperamide . By 16S rDNA gene sequencing, the disbalanced gut microbiota was observed in constipated mice, while COS treatment statistically reversed the abundance changes of several intestinal bacteria at either phylum, family and genus levels, which partly led to the balance in production of intestinal metabolites including bile acids, short-chain fatty acids and tryptophan catabolites. In addition, COS failed to relieve the constipation in mice with intestinal flora depletion, confirming the essentiality of gut microbiota in COS-initiated prevention against constipation. In summary, COS can ameliorate the development of loperamide-induced constipation in mice by remodeling the structure of gut microbial community.
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Journal of Materials Chemistry C
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2020
·Vol. 9
·期 2
·620-632
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IF 7.059
Guorong Wang,Zhiliang Jin
The combination of large energy density and high power density is the optimized model for supercapacitors. However, due to the sluggish charge transfer and ion diffusion, cobalt-aluminium hydrotalcite (CoAl LDHs) electrode materials currently deliver barely satisfactory performance. Oxygen vacancies have been reported to have positive facilitation to the electrochemical property of the hydrotalcite-like materials. In this work, the proportion of oxygen vacancies in CoAl LDHs was increased by NaBH4 treatment, which improved the electrochemical energy storage performance of pristine CoAl LDHs, while prolonged treatment will damage the internal structure of the material and is not conducive to the improvement of electrochemical performance. Consequently, the acquired CoAl LDHs-0.5 delivers a high specific capacity of 799.2 F g−1 at a current density of 1 A g−1 and maintains 81.1% capacity as the current density up to 20 A g−1, which exhibited higher performance than pristine CoAl LDHs and the most reported CoAl LDH-based materials. Besides, the asymmetric supercapacitor (ASC) was fabricated using CoAl LDHs-0.5 and commercial activated carbon (AC) as the positive and negative electrodes, respectively, which exhibits a maximum energy density of 28.9 W h kg−1 at a power density of 523.5 W kg−1 and retains 73.3% of the initial capacity after 5000 cycles at a current density of 5 A g−1. This work provides an ingenious strategy and builds confidence in the further application of CoAl LDHs in electrode materials of supercapacitors.
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WATER RESEARCH
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2020
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IF 9.13
Tianyu Gao,Hanmin Zhang,Xiaotong Xu,Jiaheng Teng
It has been reported that anaerobic osmosis membrane bioreactors have the potential for energy recovery since dissolved methane was almost rejected by commercial forward osmosis membranes. Notwithstanding, upgraded biogas has to be achieved by removing as much carbon dioxide as possible. In this study, a novel anaerobic osmotic membrane bioreactor-microbial electrolysis cell (AnOMBR-MEC) system was developed for simultaneous biogas upgrading and wastewater treatment. The AnOMBR-MEC elicited an excellent and stable soluble chemical oxygen demand and phosphorus removal. As the experiment progressed, unwanted carbon dioxide produced from biogas was reduced to formate using a SnO 2 nanoparticles electrocatalytic cathode in an electrocatalytic-assisted MEC, with the highest faradic efficiency of formate being 85% at 1.2V. Compared to AnOMBR, the methane content increased from 55% to 90% at the end of operation and methane yield experienced a1.6-fold increment in the AnOMBR-MEC. Microbial community analysis revealed that hydrogenotrophic methanogens (e.g. Methanobacterium and Methanobrevibacte r) converted the produced H 2 and formate to methane at saline conditions. These results have demonstrated an efficient strategy based on the integration of an electrocatalytic-assisted MEC into AnOMBR for upgrading biogas, enhancing methane yield and wastewater treatment.
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JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Le Xu,Yukun Xi,Xiaojun Sun,Pusu Zhao,Fengxia Zhu,Jingzhou Yin,Luyang Chen,Junhua Hu,Xifei Li
Rational design of the electrode materials in distinctive architecture and tailored composition is critical for regulating their electrochemical properties . Herein, the novel porous zinc-cobalt sulfides (ZCS) bead-curtain-like arrays (BCA) supported by three-dimensional Ni foam (NF) (denoted as ZCS/NF BCA) are fabricated as advanced electrode for supercapacitors (SCs), which exhibit remarkable electrochemical performances in respect of superb capacity of ~837 C g −1 (specific capacitance of ~1860 F g −1 ) at 1 A g −1 and ultra-long cycling stability (~92.9% retention after 5000 cycles at 6 A g −1 ). Furthermore, the assembled hybrid supercapacitors based on ZCS/NF BCA delivers ultrahigh energy density of ~88 Wh kg −1 with a maximum power density of ~800 W kg −1 . The excellent properties may be ascribed to the combined contributions from the hierarchical bead-curtain architecture of ZCS/NF BCA composite and the bimetallic sulfide with abundant valence states for rich redox reactions .
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wenjie Xue,Hongxia Liu,Baohua Mao,Honglei Liu,Minghuang Qiu,Chengguang Yang,Xinqing Chen,Yuhan Sun
Hydrogen is a promising candidate to replace the exhausting fossil fuels. However, it is still a big challenge for hydrogen storage. Liquid organic hydrogen carrier (LOHC), which possesses high safety and purity, easy transport and reversibility, is highly attractive for hydrogen storage. Herein we report a new reusable bimetallic Pd-Rh nanoparticles (NPs) catalyst with synergy effect, boosting both the hydrogenation of N-ethylcarbazole (NEC) and dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NEC), which allows multiple cycles of reversible high-weight% hydrogen storage and uptake in short reaction time. Various ex- and in-situ characterizations evidenced that the superior activity was attributed to the bimetallic Pd-Rh NPs cluster structure on the surface of γ-Al 2 O 3 support. The mechanism of NEC hydrogenation over the Pd-Rh catalyst was proposed and verified by density functional theory (DFT) calculations. Such a strategy can be extended to other LOHCs and sheds light onto the development of LOHCs as energy vectors.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Guilin Tang,Yan Qiao,Ling Yu,Chang Ming Li,Zhisong Lu
The textile-based flexible electronic device has attracted considerable attention due to its excellent conformability, skin affinity, and compatibility with the clothing industry. However, the machine-washing process may damage the electronic components, further resulting in the failure of the device. Herein, parafilm, a commercially available cohesive thermoplastic, is introduced as both a substrate and encapsulating material to fabricate an all-solid-state supercapacitor, which could be tightly stuck on and easily peeled off from a fabric. The supercapacitor possesses excellent capacitive behavior (73.7 F/g at a current density of 1 A/g), long cycle life (capacitance retention >90% after 5000 cycles), and great flexibility (capacitance retention >98% after 100 times of bending/twisting). After water flushing and soaking, the capacitance of the supercapacitor could be retained at about 98% of its original level. A parafilm-based piezoresistive sensor with good pressure-sensing performance has also been fabricated via the same approach to demonstrate the universality of the proposed strategy for textile re-stickable electronics. This work may not only fabricate novel flexible electronic systems for wearable applications but also provide a universal strategy to address the machine-washing issues in textile electronics.
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ANALYTICAL SCIENCES
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2020
·Vol. 36
·期 10
·1157-1161
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IF 2.049
Yu Wenjie,Li Hengye,Zhang Lin,Liu Jing,Kong Fenying,Wang Wei
In this study, efforts were made to prepare a porous aromatic framework (PAF) with build-in magnetic nanoparticles (Fe3O4-PAF) for use as an efficient adsorbent for the removal of organic pollutants from water. The Fe3O4-PAF showed good handleability and could be recovered easily by magnetic separation. As a proof of concept, the adsorption properties of Fe3O4-PAF were investigated to remove 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) from water. The Fe3O4- PAF showed a fast adsorption rate, high adsorption efficiency and high adsorption capacities. It adsorbed 2,4-DCP (0.1 mmol L −1 ) and BPA (0.1 mmol L −1 ) with pseudo-second-order rate constant (k2) of 2.1 and 3.54 g mg −1 min −1 , respectively. According to the Langmuir isotherm model, the maximum adsorption capacities of 2,4-DCP and BPA onto Fe3O4-PAF were calculated to be 234.74 and 233.65 mg g −1 , respectively. The Fe3O4-PAF also featured good tolerance to harsh conditions, facilitating its application in a real water environment. It could be regenerated easily and reused multiple times without obvious loss of efficiency. In summary, this study provides a general and effective way to improve the handleability of PAFs and expands the practical application of PAF-based materials.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Xueying Yang,Cuili Xiang,Yongjin Zou,Jing Liang,Huanzhi Zhang,Erhu Yan,Fen Xu,Xuebu Hu,Qiong Cheng,Lixian Sun
Transition metal oxides are ideal electrode materials used for supercapacitors . However, the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy consumption. Herein, we report the synthesis of sea urchin-like Co 3 O 4 -NiO composites supported on graphene oxide (GO) using a hydrothermal method followed by calcination with a low temperature (250 °C). The obtained Co 3 O 4 -NiO/GO composite demonstrates a high specific capacitance of 883 F g −1 at 1 A g −1 . Furthermore, upon coupling with an activated carbon (AC) positive electrode, an asymmetric cell of Co 3 O 4 -NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g −1 . The excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co 3 O 4 and NiO, as well as the assembly of Co 3 O 4 and NiO into a sea urchin structure, which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process .
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Materials Research Express
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2020
·Vol. 7
·期 3
·035507
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IF 1.929
Weimin Guo,Qinglin Zhu,Qinghua Lu
Li–S battery has high theoretical specific capacity and specific energy, but the shuttle effect challenges its commercial application. So many composite materials had been prepared to conquer it. In this research, MCNT/MoS2/S composite and MCNT/MoS2/S composite cathode were prepared respectively by a facile hydrothermal method and by melt diffusion method. MoS2 and MCNT showed uniformly combined together by SEM and TEM. The electrochemical properties of the MCNT/MoS2/S cathode were carried out on a Gamry electrochemical workstation. The initial capacity arrive 820 mAh·g−1 at 0.1 C, and specific capacities up to ∼460 mAh·g−1 over more than 300 cycles at 0.5 C. The improvement of electrochemical performance due to MoS2 strongly adsorbing polysulfide and the conductivity network of MCNT.
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Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Rui Shan,Yueyue Shi,Jing Gu,Jingwang Bi,Haoran Yuan,Bo Luo,Yong Chen
A series of mangosteen-derived biochars were produced by several modifiers (HCl, KOH and ZnCl 2 ), in different preparation conditions (i.e. pyrolysis temperature, pyrolysis process and impregnation ratio). It indicated that the Z2PT350-700 presented excellent ability for Cr(VI) removal. The physical/chemical properties of the prepared biochar are reflected by the electrostatic interaction, surface complexation, ion exchange occupied primary position in the process of adsorbing Cr(VI). Besides, the effects of reaction time, pH, adsorbent dosage and initial adsorbate concentration on Cr(VI) removal were evaluated. The sorption process of Cr(VI) could be described by the pseudo-second order (PSO) kinetic model and Sips isotherm model. In optimal reaction condition, the surface of Zn2MB350-700 was composed of homogeneous and heterogeneous adsorption and the chemical adsorption dominated in the adsorption process . Therefore, the results suggested that Zn2MB350-700 could be used as an inexpensive and highly efficient adsorbent for Cr removal from water environment.
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