CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xiongfang An,Yang Chen,Minghui Ao,Yahui Jin,Liwei Zhan,Bing Yu,Zhansheng Wu,Peikun Jiang
Photocatalysis is regarded as one of the most promising techniques for degrading organophosphorus pesticides (OPs) from wastewater given its low-cost and environmental benignity. Yet, photocatalytic degradation of OPs is an incomplete process, since PO 4 3− is produced after photocatalysis. Here, biochar-supported α-Fe 2 O 3 /MgO composite (BC-α-Fe 2 O 3 /MgO) is developed for sequential photocatalytic degradation of OPs and recovery of the produced PO 4 3− . The degradation efficiency of N-phosphonomethyl iminodiacetic acid (NPA) by BC-α-Fe 2 O 3 /MgO based photocatalysis reaches 90.1% within 80 min, and the recovery ratio of the produced PO 4 3− by BC-α-Fe 2 O 3 /MgO is as high as 82.3%. Besides, the as-prepared BC-α-Fe 2 O 3 /MgO used in this integrated photocatalysis and adsorption process maintain a high stability towards NPA degradation and PO 4 3− recovery during five cycling experiments. The mechanistic study reveals that holes, •OH, and • O 2 – radicals generated in the photocatalytic process are responsible for NPA degradation. UV light can activate persistent free radicals on BC-α-Fe 2 O 3 /MgO surface, which provide O 2 with electrons for the generation of • O 2 – and subsequent yield of •OH. Moreover, the presence of α-Fe 2 O 3 and MgO on the surface of biochar leads to the excellent P adsorption performance of BC-α-Fe 2 O 3 /MgO. This study opens new possibilities for the recovery of P resource from organophosphorus polluted wastewater.
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2022
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IF 5.545
Liang Qingwen,Tang Ping,Zhou Jing,Bai Jinghe,Tian Dan,Zhu Xiaofei,Zhou Defeng,Wang Ning,Yan Wenfu
Solid state electrolytes have been intensively studied in the solid oxide fuel cells (SOFCs). The aim of this work is to investigate the effects of MgO and Fe2O3 dual sintering aids on the microstructure and electrochemical properties of solid state Gd0.2Ce0.8O2-δ (GDC) electrolytes, which are prepared by a sol-gel method with MgO and Fe2O3 addition to the GDC system. It is found that the addition of MgO and Fe2O3 can reduce the sintering temperature, increase densification and decrease the grain boundary resistance of the electrolyte. The 2 mol% MgO and 2 mol% Fe2O3 co-doped GDC (GDC-MF) exhibits the highest grain boundary conductivity. At 400°C, the grain boundary conductivity and total conductivity of GDC-MF are 15.89 times and 5.56 times higher than those of GDC. The oxygen reduction reaction (ORR) rate at the electrolyte/cathode interface of GDC-MF is 47 % higher than that of GDC. Furthermore, the peak power density of a single cell supported by GDC-MF is 0.45 W cm−2 at 700°C, 36.7% higher than that of GDC. Therefore, the GDC-MF should be a promising electrolyte material for intermediate-temperature solid oxide fuel cells (IT-SOFCs).
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产品关联
DOI
PubMed
高影响因子
BIOMASS & BIOENERGY
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2024
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IF 5.8
Zhenjing Jiang,Wuyu Wang,Xuelai Zhao,Xinghua Zhang,Qi Zhang,Longlong Ma
Production of jet fuel is not only promising but challenging in the field of biomass utilization. Here we proposed a novel route to produce highly branched alkanes with ultra-low freezing point using n-butyraldehyde as feedstock by self-aldol condensation and subsequent hydrodeoxygenation (HDO). The catalyst characterization revealed that the MgO-SiO 2 catalyst played an acid-base synergetic effect role in the self-aldol condensation of n-butyraldehyde using n-butanol as solvent, which obtained C8 oxygenate and C12 oxygenate with yield of 69.3 % and 26.8 % respectively. The medium Brønsted base site of the catalyst captured α-H to promote the formation of enolate from n-butyraldehyde, and the Lewis acid sites promoted the dehydration of intermediate products. DFT simulation showed that n-butanol activated α-C in enolate in aldol condensation, and deactivated the oxygen atoms in enolate by hydrogen bonds to inhibit side reactions. Finally, the obtained condensation products were subjected to HDO reaction over the 5 wt% Pd/C and HZSM-5 catalysts, obtaining the highly branched alkanes with an ultra-low freezing point of -120.7 °C for C8 alkane and -78.7 °C for C12 alkane suitable for bio-jet fuels.
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DOI
高影响因子
Biomaterials Advances
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2022
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IF 0
Xiaohao Sun,Xiao Yu,Wei Li,Minfang Chen,Debao Liu
Metal matrix composites have been recognized as a feasible approach to obtain a new generation of biodegradable Zn-based material. Nevertheless, there is a great challenge in achieving good dispersion properties of the bioactive reinforcements within zinc matrix. A novel and facile approach, namely graphene oxide (GO)-assisted hetero-aggregation, were developed to achieve uniformly dispersed nanoceramics in the Zn matrix, by using very low-content (0.03 vol%) GO as a linker between the Zn matrix and reinforcement. The negatively-charged GO becomes a suitable “bridge” connected the positively-charged metallic powder and bioactive reinforcement by charge neutralization in polarity solvent. Three kinds of reinforcements, including MgO , ZnO and CuO, were used to verify the feasibility of the above-mentioned method. As-sintered 3CuO/Zn matrix composites , which possessed uniformly distributed reinforcement, uniaxial compressive strength of 301.2 MPa, failure strain over 40%, moderate corrosion rate of 0.063 mm·y −1 , acceptable cytocompatibility and antibacterial property , should be a useful material for orthopedic applications .
研究领域:
材料科学
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生物医学工程
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DOI
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Zuoxiang Dong,Jian Xu,Peng Lun,Zeyu Wu,Wenshuai Deng,Peng Sun
Given the widespread clinical demand, addressing irregular cranial bone defects poses a significant challenge following surgical procedures and traumatic events. In situ-formed injectable hydrogels are attractive for irregular bone defects due to their ease of administration and the ability to incorporate ceramics, ions, and proteins into the hydrogel. In this study, a multifunctional hydrogel composed of oxidized sodium alginate (OSA)-grafted dopamine (DO), carboxymethyl chitosan (CMCS), calcium ions (Ca2+), nanohydroxyapatite (nHA), and magnesium oxide (MgO) (DOCMCHM) was prepared to address irregular cranial bone defects via dynamic Schiff base and chelation reactions. DOCMCHM hydrogel exhibits strong adhesion to wet tissues, self-healing properties, and antibacterial characteristics. Biological evaluations indicate that DOCMCHM hydrogel has good biocompatibility, in vivo degradability, and the ability to promote cell proliferation. Importantly, DOCMCHM hydrogel, containing MgO, promotes the expression of osteogenic protein markers COL-1, OCN, and RUNX2, and stimulates the formation of new blood vessels by upregulating CD31. This study could provide meaningful insights into ion therapy for the repair of cranial bone defects.
研究领域:
材料科学
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生物材料
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组织工程
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生物医学工程
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骨科
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再生医学
✓ 已验证
DOI
PubMed
高影响因子
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