Asia-Pacific Journal of Chemical Engineering
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2023
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IF 1.8
Kai Fei,Zhuo Yi Dong,Li Shi,Xuan Meng,Naiwang Liu
Transformer oil plays a critical role in ensuring the insulation and normal operation of power transformers. However, during operation, the transformer oil would undergo oxidation and degradation, leading to the formation of acids and polar compounds that increase its acidity and degrade its performance. Hence, the recycling and regeneration of aged transformer oil is an essential practice in transformer maintenance, contributing significantly to the extension of a transformer's operational lifespan and the reduction of potential risks. Adsorption separation is a preferred method for regeneration, offering simplicity and high efficiency. This study focuses on impregnated γ-Al 2 O 3 as an adsorbent for acidity removal in waste transformer oil. We conducted static adsorption experiments to investigate the optimal loading amount of the active component and the best calcination temperature for acid removal. XRD technique is employed to monitor the phase changes of the carrier during the calcination process. BET analysis is used to observe variations in the specific surface area and pore volume of the adsorbent during the modification process. DTG-TGA is utilized to assess the weight loss during the calcination process. FTIR is employed to observe changes in functional groups during modification and adsorption processes. Along with these investigations, a study is also carried out to assess the dynamic acid removal performance of the acid-removing adsorbent loaded into a fixed bed. The findings contribute to the development of sustainable methods for regenerating transformer oil, ensuring efficient and environmentally friendly operations.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
·Vol. 18
·期 3
·e2901
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IF 1.8
Yu Jia,Haoran Zhao,Yihang Chen,Xuanyu Liang,Hongge Tao,Guizhuan Xu,Chun Chang
The reaction characteristics and mechanism of carbohydrates is important in exploring and developing suitable technology for biofuels and biochemical production from lignocellulosic biomass. In this study, experiments combined with density functional theory (DFT) calculation and molecular dynamics (MD) simulation were used to investigate the glucose alcoholysis reaction mechanism catalyzed by extremely low concentrated sulfuric acid. The effects of temperature and tetrahydrofuran (THF) on the distribution of the product in the alcoholysis process of high-concentration glucose were investigated. DFT calculation results showed that the addition of THF in ethanol can decrease the energy barrier of glucose degradation. Meanwhile, the MD simulation indicated that the catalyst tends to localize more around the glucose molecular, which was beneficial to the glucose degradation in ethanol. Combining the experimental and theoretical results, plausible glucose alcoholysis reaction pathways were proposed in this work. It was found that when temperature was lower than 190°C, the three main pathways were glucose conversion into ethyl glucoside (EDGP); glucose conversion into 1,6-anhydro-β-d-glucopyranose (LG), then further to levoglucosone (LGO), furans, or 1,4:3,6-dianhydro-α-d-glucopyranose (DGP); and glucose conversion to fructose. However, at higher temperatures (190 and 220°C), the main reaction pathways were, glucose conversion into LG, LGO, and ethyl levulinate (EL); glucose conversion into fructose, 5-hydroxymethylfurfural (HMF), 5-ethoxymethylfurfural (EMF), and EL; and glucose conversion into humins. DFT, MD simulation, and experimental results showed that the addition of THF is beneficial for the EDGP formation from high concentration glucose catalyzed by Brønsted acid.
研究领域:
生物化学
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计算化学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
·Vol. 18
·期 5
·e2949
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IF 1.8
Xinyue Xu,Qian Wang,Xue Zhu,Qigang Wu,Tao Zheng,Haoran Yuan,Zhengzhong Zhou
Fouling is one of the most challenging issues faced by membrane technology. One possible approach to address membrane fouling is incorporating hydrophilic materials into the membrane matrix. Graphene oxide (GO) can be a potential candidate due to its hydrophilicity, if its cost could be significantly reduced. In this study, a GO-polysulfone (PSF) composite membrane is fabricated with a thin GO-PSF active layer and a PSF substrate. The obtained membrane shows good anti-fouling property in real sewage system, compared with the pristine PSF membrane, and the flux recovery ratio is enhanced by 20%–30%. In addition, the antibacterial property of GO-PSF membrane to Escherichia coli is enhanced. The work provides a guidance to improve the performance membranes and reduce the cost.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
·Vol. 18
·期 5
·e2962
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IF 1.8
Tianming Yang,Xin Xin,Jin-Chi Jiang,Zhenhao Yin,Long-Yue Meng
The sensitive detection of heavy metal ions with high toxicity and mobility is extremely important for environmental monitoring. In this study, nitrogen-doped biochar (N-BC) was synthesized using waste mushroom bran as a raw material, and nitrogen atoms were successfully doped onto the surface of the biochar via a facile process using an activation-carbonation strategy. The functional groups on the surface of the biochar were enriched via doping, and the roughness of the biochar surface was significantly improved. Experimental results showed that N-BC was an efficient sensing material for electroanalysis; therefore, it was used to construct a novel electrochemical sensing platform. The electrochemical response of the biochar-modified working electrodes was effectively improved for the detection of heavy metals. Under optimized deposition potential, enrichment time, and pH, the N-BC-based sensing platform could detect Pb 2+ and Cd 2+ separately as well as simultaneously, indicating its significant potential for electrochemical sensing.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
·Vol. 18
·期 5
·e2937
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IF 1.8
Xinxin Xia,Hongyang Yu,Pindian Qin,Mingyu Dai,Lixue Jia,Yi Deng,Cuiqin Li,Feng Li
Tetraethyl p -xylenediphosphate is used as the organic ligand to prepare the organodiphosphonate Zr-based metal organic frameworks (ZrP-MOF). The physicochemical characterizations of ZrP-MOF under different hydrothermal and calcination conditions were performed by various analytical techniques. ZrP-MOF was then employed as a catalyst for the catalytic transfer hydrogenation of furfural with alcohol as the hydrogen donor, and the preparation parameters and catalytic properties of ZrP-MOF were investigated. Compared with fresh ZrP-MOF, the furfural conversion of ZrP-MOF calcined at 825 K increased from 43.5% to 95.1%. Calcination can significantly increase the Lewis/Brønsted acid ratio and enlarge the pore structure of ZrP-MOF, which promote the furfural catalytic transfer hydrogenation reaction over Zr-O based on the Meerwein–Ponndorf–Verley reduction.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
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IF 1.8
Kai Sun,Xinbao Li,Ye Yuan,Yucheng Wang,Ying Chen,Yingying Zhu,Junliang Lu
Adsorption of volatile gasoline components at oil terminal by using metal organic frameworks (MOFs) is a prospective technology in reducing environment pollution and increasing oil resource recovery. In this study, a typical MOF of HKUST-1 was facile prepared by solvothermal method and tested in the adsorption of volatile gasoline components. Isobutylene was selected as a model compound. The effects of preparation parameters Cu 2+ /H 3 BTC molar ratios, Cu 2+ precursors, and solvent compositions on the structure of HKUST-1 and its subsequent adsorption performance were systematically studied. The synthesized samples were characterized by XRD, SEM, and N 2 physisorption. It was found that the HKUST-1 prepared by using DMF as the unique solvent obtained the highest specific surface area (1076.7 m 2 /g) and the largest pore volume (0.90 cm 3 /g). Furthermore, the maximum isobutylene adsorption capacity of 31.9 mg/g was found on the HKUST-1 which prepared under the conditions of Cu 2+ /H 3 BTC = 2, Cu (CH 3 COO) 2 as the Cu 2+ precursor, and a solvent composition of DMF:EtOH:H 2 O = 0:4:3.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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