Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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A Novel Silicone Rubber for Situation Awareness
No full textAbstract
An insulator plays an important role in the external insulation of power grid. The antifouling flashover coating on the insulator’s surface can effectively reduce the incidence of pollution flashover accidents. Local overheating, local arc, lightning and other damage lead to the deterioration of the antifouling flashover coating, resulting in pollution flashover accidents. In order to realize the on-line identification of electric arc on the surface of antifouling flashover coating, various functional nanoparticles were prepared and added into the silicone rubber to prepare functional antifouling flashover coating. The colour deviation of the coating heated at different temperatures was measured by a spectrophotometer, and the trace of arcs on the sample surface was observed. The results show that the functional nanoparticles can slightly improve the tensile strength and AC breakdown strength of silicone rubber composites. The composites change colour in 2 min at 250°C or 1s at 500°C, showing obvious indication traces after an electric arc passes the surface of an insulator in a short period. Still, the composites possess excellent functional properties after 1000h artificial accelerated aging test
Red mud recycling by Fe and Al recovery through the hydrometallurgy method: a collaborative strategy for aluminum and iron industry
No full textIn this work, a collaborative strategy for the aluminum and iron industry based on red mud recycling through the hydrometallurgy method was proposed. In this method, Fe3+ and Al3+ were firstly separated from the red mud by using H2SO4 as a leaching agent, which was by-produced from the sintering process of an iron and steel industry. Multiple influence factors on the leaching process were investigated, with the H2SO4 addition amount showing the strongest influence on the leaching rates of Al and Fe. The main components of the filter residue were CaSO4, TiO2, and SiO2, which could be reused as additives in the building materials. Subsequently, the final Fe recovery product was obtained through the co-precipitation, Fe/Al separation, and Fe(OH)(3) calcination. In the final product, the content of Fe2O3 reached 82.87%, and the iron grade was 58.01%, meeting the requirement being raw materials for sinter production
Fabrication of Hierarchical Porous Metal Oxides by the HPMC- Assisted Gel Combustion Strategy: Incorporation of Nanoceria into Cookie-like Mn2O3 with Enhanced Oxidation Activity and Excellent Water Resistance
No full textConstructing nonprecious metal oxide catalysts with a hierarchical porous structure by a simple method for the deep catalytic oxidation of toxic volatile organic compounds at low temperatures is of great value and significance. In this work, a porous manganese trioxide catalyst (Mn2O3-H) was prepared by a hydroxypropyl methylcellulose-assisted combustion synthesis strategy for catalytic complete oxidation of gaseous toluene. Benefiting from the rich porous nanostructure, Mn2O3-H has much higher specific surface area and active site density, resulting in better low-temperature reducibility and oxygen activation ability than blank Mn2O3 formed by direct calcination. With this sol-gel combustion process, CeO2 nanoparticles could be successfully introduced to form cookie-like Ce-Mn composite oxide with a hierarchical porous nanostructure, which builds the strong interaction of CeO2- Mn2O3 to weaken Mn-O with more active defects. Among Ce-doped catalysts, 5% CeMn-H shows the best catalytic activity in toluene oxidation with 90% conversion temperature at 242 degrees C under a weight hour space velocity of 60,000 mLmiddotg-1middoth-1, which is about 30 and 133 degrees C lower than that of Mn2O3-H and Mn2O3-B, respectively. This advantage is also shown in other typical hydrocarbons such as propylene and propane. Moreover, the as-prepared Ce-doped catalyst exhibits excellent stability and water resistance ability. This simple robust sol-gel combustion method will provide valuable enlightenment for designing porous catalysts with high performance for related catalytic reactions
Phytochemical analysis and bioactivity of different ethanolic extracts from cannabidiol full-spectrum oil
No full textIndustrial hemp is an important economic crop. The extract of its leaves is well-known as cannabidiol full-spectrum oil (CFSO) and has great application potential. But the chemical composition of CFSO is still not clear, which limits its efficient application. Therefore, this work aimed to explore the phytochemical profile and composition-activity relationship of CFSO. The results showed that a total of 12 cannabinoids were identified by HPLC-ESI-MS and they were CBD-C1, CBGVA, CBGA, CBGV, CBDVA, CBG, CBDV, CBDA, CBD, CBD-C4, CBN, and CBT. CBD (559.3 mg/g) was the most abundant component, followed by CBDV (302.4 mg/g) and CBN (31.7 mg/g). Besides, the content of CBDV, CBD, and CBN of different polar extracts increased with the rise of ethanol concentration. The TPC and TFC of the extracts also increased with the rise of ethanol concentration. The extract of 90 % EtOH had the highest TPC (949.21 +/- 2.37 mg GAE/g extract) and TFC (267.05 +/- 1.21 mg RE/g extract) while the extract of 0 % EtOH displayed the lowest TPC (244.89 +/- 2.13 mg GAE/g extract) and TFC (46.26 +/- 0.85 mg RE/g extract). Furthermore, as ethanol concentration increased, the cytotoxicity, antioxidant, and antibacterial activities of the extracts had a significant increasing trend. And the correlation analysis demonstrated that the antioxidant activity and cytotoxicity of the extracts were closely related with the phenolic compounds and flavonoids, especially cannabinoids. These findings could provide data support for the application of CFSO. (c) 2022 Elsevier B.V. All rights reserved
