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Efficiently Improved the Stability for a Low Concentration of Hcho Degradation Over the Hexagonal Prism Structure of Mnce-Mofs Catalysts

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SSRN 2024年

作者： An, Guo-Fang Huang, Qiong Li, Xin Mao, Jun-Jie Wei, Chen Yang, Bo Li, Da-Wei Chen, Min-Dong Li, Jiejie Yang, Hong Tao, Tao Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control School of Environmental Science & Engineering Nanjing University of Information Science & Technology Nanjing210044 China School of Chemistry and Materials Science Nanjing University of Information Science & Technology Nanjing210044 China Department of Geography and Environmental Science University of Reading Whiteknights ReadingRG6 6AB United Kingdom Nanjing University of Information Science and Technology China

Efficient and stable removal of a low concentration of indoor formaldehyde (HCHO) required by the national standard (≤ 0.08 mg/m3) still faces significant challenges. In this study, a new kind of hexagonal prism structures of MnCe-MOFs catalysts synthesized by hydrothermal method with DMF was investigated to complete degradation of HCHO at ambient temperature. Monometallic and bimetallic MOFs materials, calcination temperature and stability of these high-performance catalysts on the degradation were investigated and characterized by EDS, XPS, H2-TPR, IR and ESR. Results demonstrated that the HCHO degradation over MnCe-MOFs reached 97.2% in 48 hours and remained above 96% after three experimental cycles and exhibited the highest activity and stability. The high performance was attributed to columnar structure with abundant pores and specific surface area, lower initial reduction temperature and an abundant surface hydroxyl group. Furthermore, spherical nanoparticles of MnCe-MOFs were uniformly distributed and highly dispersed CeOx provided plentiful active sites for the high activity and stability. © 2024, The Authors. All rights reserved.

关键词： Catalytic oxidation

Ultrasound-Assisted the Alkaline Hydrolysis of Fish Scale Gelatin: A Possible Curcumin Delivery System with Increased Water Solubility and Sustained Release

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SSRN 2023年

作者： Liu, Jia Li, Haoxin Wan, Aida Wan Mustapha Zhang, Xiaoping The Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Provincial Engineering Research Center of Ecological Food Innovation School of Public Health Guizhou Medical University Guiyang550025 China Institute of Food Processing Technology Guizhou Academy of Agricultural Sciences Guiyang550006 China Bangi43600 Malaysia Guizhou Fishery Research Institute Guizhou Academy of Agricultural Science Guiyang550025 China

This study sought to investigate the effect of ultrasound-assisted alkaline treatment on the structural characteristics and curcumin loading efficiency in fish scale gelatin (FSG). The results showed that FSG subjected to the ultrasound-assisted alkaline treatment outperformed non-treated FSG, as well as alkali- or ultrasonic-treated FSG in augmenting curcumin loading efficiency (18.36 µg/mL) and protein elution amount (180.87 μg/mL). In contrast to FSG exposed to individual treatments (alkali or ultrasound), the FSG subjected to combined treatment exhibited a notably higher ratio of hydrophobic amino acids (47.51 ± 2.27%). Meanwhile, individual alkali or ultrasonic and ultrasound-assisted alkaline treatments had the capacity to significantly modify the secondary and tertiary structures, as well as the microstructure of FSG. The curcumin-loaded FSG subjected to ultrasound-assisted alkali treatment exhibited a sustained release profile in simulated gastrointestinal conditions. The elucidated outcomes underscore the significant potential of ultrasound-assisted alkali-treated FSG as a promising avenue for facilitating the controlled delivery of bioactive hydrophobic nutrients. © 2023, The Authors. All rights reserved.

关键词： Ultrasonics

Mechanism Research of Modified Cellulose Improving the Thermal Gel Properties of Egg Yolk

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SSRN 2023年

作者： Huang, Qun Li, Xin Zhang, Yufeng Huang, Xiang Wu, Yongyan Geng, Fang Luo, Peng Li, Xiefei School of Public Health Guizhou Province Engineering Research Center of Health Food Innovative Manufacturing The Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Medical University Guiyang550025 China College of Food Science Fujian Agriculture and Forestry University Fuzhou350002 China Institute for Egg Science and Technology School of Food and Biological Engineering Chengdu University Chengdu610106 China

Natural plant fiber is insoluble in water, and the particle size is large, when it is used in modified egg yolk protein gel, its quality will be rough and hardness. In this study, two kinds of modified cellulose were selected to improve the thermal gel properties of egg yolk. The results showed that the two kinds of cellulose promoted the formation of ordered structure of yolk gel. The ordered gel network not only improved the texture properties and rheological properties, but also improved the water retention of yolk gel significantly. At the same concentration, CMC had good dispersion, so its effect on improving egg yolk gel performance was significantly better than CNFC. However, in the yolk gel containing 1.20-1.60% CNFC, the cross-linking of yolk protein was blocked, the network structure of protein was destroyed, and the quality of gel was significantly reduced. © 2023, The Authors. All rights reserved.

关键词： Proteins

Characterization of Aroma Compounds in Rosa Roxburghii Tratt Using Solvent-Assisted Flavor Evaporation and Headspace-Solid Phase Microextraction Coupled with Gas Chromatography-Mass Spectrometry and Gas Chromatography-Olfactometry

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SSRN 2023年

作者： Sheng, Xiaofang Huang, Mingzheng Li, Tingting Li, Xin Cen, Shunyou Li, Qinyang Huang, Qun Tang, Weiyuan College of Liquor and Food Engineering Guizhou University Guizhou Guiyang China College of Food and Pharmaceutical Engineering Guizhou Insititute of Technology Guizhou Guiyang China School of Public Health The Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Medical University Guizhou Guiyang China Guizhou Hongcai Junong Investment Co. Ltd. Guizhou Liupanshui China Guizhou University China

Rosa roxburghii Tratt (RRT) has become popular owing to its high vitamin C content. Volatiles are important factors that affect the quality of RRTs and their processed products. In this study, volatile compounds were extracted using headspace-solid phase microextraction (HS-SPME) and solvent-assisted flavor evaporation (SAFE);147 volatile compounds were identified by gas chromatography-mass spectrometry (GC‒MS), RRTs from different origins were well distinguished based on principal component analysis. 45 odor-active components were identified using gas chromatography−olfactometry (GC-O). Through quantitative descriptive analysis(QDA), there were prominent "grassy" and "tea-like" attributes in RRT. Partial least-squares regression (PLSR) revealed that Longli RRT was greatly related to "tea-like" and "woody" attributes. Among the volatiles identified, alcohols and esters were considered the dominant volatile compounds of RRT, 4-methoxy-2,5-dimethyl-3(2H)-furanone was the most prominent compound. This study enriches the flavor chemistry theory of RRT and provides a scientific basis for optimizing the aroma of RRT and its processed products. © 2023, The Authors. All rights reserved.

关键词： Principal component analysis

Nutrient Released Characteristics of Struvite-Biochar Fertilizer Produced from Concentrated Sludge Supernatant by Fluidized Bed Reactor

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SSRN 2022年

作者： Li, Yingxue Xu, Defu Lin, Haizhi Wang, Wenhua Yang, Hong School of Applied Meteorology Nanjing University of Information Science &Technology Nanjing210044 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing210044 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing210044 China Rapeseed Research Institute Guizhou Academy of Agricultural Sciences Guiyang550008 China Department of Geography and Environmental Science University of Reading ReadingRG6 6AB United Kingdom

With the exacerbating water eutrophication globally, it is important to recover nitrogen (N) and phosphorus (P) from sewage for recycle. In this study, coconut shell biochar and ethylene diamine tetraacetic acid (EDTA) was added into the designed fluidized bed reactor (FBR) to create struvite-biochar. N and P released from struvite-biochar and the recovery efficiency of N and P from concentrated sludge supernatant were analyzed. Results showed that the optimal operation condition for hydraulic retention time (HRT), pH, Mg/P molar ration, and addition amount EDTA were 90 min, 9.5, 1.2, and 0.2 g/L, respectively. The recovery efficiency of NH4+-N and PO43-P, and purity struvite for FBR were 34.41%-38.05%, 64.95-68.40%, and 84.15%, respectively. The recovery efficiency of NH4+-N and PO43-P were respectively increased by 7.23% and 5.36% when FBR with addition of 0.33 g/L coconut shell biochar, but purity struvite from struvite-biochar decreased by 45.70%. Contents of As, Cd, Pb, and Cr in struvite and struvite-biochar were all lower than Chinese Standard Limits of Fertilizer. Compared to commercial chemical fertilizer, such as superphosphate and urea, struvite-biochar and struvite have slowly released N and P. The amounts of released P, NO3-N and NH4+-N from struvite-biochar were higher than struvite during the five leaching times. Compared with struvite, the total amounts of released P, NO3-N and NH4+-N from struvite-biochar increased by 4.9%, 3.5% and 8.3%, respectively. Therefore, it is valuable to add biochar into FBR to recovery N and P from concentrated sludge supernatant and make struvite-biochar as a slow-release fertilizer. © 2022, The Authors. All rights reserved.

关键词： Ethylene

Nanostructured Tio2 Co-Modified with Silver and Bismuth for Formaldehyde Degradation Under Visible Light

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SSRN 2023年

作者： Sun, Yue-Yin Huang, Qiong Zhou, Jie Yu, Xiao-Meng Gu, Ming-Yang Xu, Li-Rui Yang, Bo Li, Da-Wei Chen, Min-Dong Tao, Tao Yang, Hong Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control School of Environmental Science & Engineering Nanjing University of Information Science & Technology Nanjing210044 China School of Chemistry and Materials Science Nanjing University of Information Science & Technology Nanjing210044 China Department of Geography and Environmental Science University of Reading Whiteknights ReadingRG6 6AB United Kingdom

Maintaining a low concentration of gaseous formaldehyde (HCHO) is still one of the great challenges for indoor environment. In this study, a series of Ag-Bi co-modified nanostructured Ag/Bi-TiO2 photocatalysts were synthesized using the hydrothermal method for catalytic degradation of a low-concentration indoor gaseous HCHO under visible irradiation. The effects of the preparation method, Ag-Bi modification amount, and other conditions on the performance of these catalysts were investigated. Developed Ag/Bi-TiO2 catalyst can degrade HCHO up to 94.1% within 48 hours, reduce the HCHO concentration from 1.076 mg/m3 to 0.093 mg/m3. Ag modified forms as Ag2O/Ag, and Ag2O formed a heterojunction with Bi-TiO2, which can effectively transfer the electrons generated by photoexcitation of Bi-TiO2;Ag acted as an electron capture center for Ag2O, which further inhibited the complexation of photogenerated electrons and holes. The catalytic degradation of HCHO was accelerated due to the synergistic effect of surface hydroxyl groups and adsorbed oxygen. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

Ultrasonic Treatment Regulates the Properties of the Gelatin Emulsion to Obtain High-Quality Gelatin Film

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SSRN 2023年

作者： Li, Xin Sha, Xiao-Mei Ren, Zhong-Yang Yang, Hong-Shun Tu, Zong-Cai School of Public Health The key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Medical University Guiyang550025 China National R&D Center for Freshwater Fish Processing College of Life Science Jiangxi Normal University Jiangxi Nanchang330022 China Department of Food Science & Technology National University of Singapore Singapore State Key Laboratory of Food Science and Technology Nanchang University Jiangxi Nanchang330047 China College of Ocean Food and Biological Engineering Jimei University 361000 China

Gelatin emulsion is a vital system preparing gelatin films. A gelatin film with water resistance and ductility can be prepared using gelatin emulsion, whereas the prepared gelatin film has several defects. A gelatin emulsion was modified through ultrasonic treatment and used to prepare the gelatin film and improve the quality of the gelatin film. The results indicated that under the condition of ultrasonic treatment for 12 min at 400 w, the relevant gelatin film had the highest zeta potential, viscosity, tensile strength, elongation at break, denaturation temperature, and enthalpy value, as well as the lowest thickness, water vapor permeability and water solubility. The above result suggested that ultrasonic treatment can be used to prepare a gelatin film with better quality by regulating the properties of the gelatin emulsion, and a certain correlation was found between the properties of the gelatin emulsion and the properties of the gelatin film. © 2023, The Authors. All rights reserved.

关键词： Tensile strength

Development of citrus peel ethanolic extract shampoo

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IOP Conference Series: Materials Science and Engineering 2019年第1期479卷

作者： Q Zhang L L Huang W C Wei K K Yang X Z Yu College of Environmental Science and Engineering Guilin University of Technology Guilin The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin Quangang district environmental monitoring station Quanzhou

The citrus peel ethanolic extract shampoo was prepared via adding the ethanolic extract, soxhlet extracted from citrus peel into the shampoo matrix through an orthogonal experiment. Meanwhile, the foam height was determined by heat and cold stability test. The experimental results show that the citrus peel ethanolic extract in a ratio of 8.0% creates a favourable compatibility by the surface agent. There was no delamination after the samples have a heat and cold stability test for 24 h.

关键词：

Influence of Dense "Water Network" on the Variation of Pm 2.5 Concentration in the Twain-Hu Basin: Numerical Simulation of A Heavy pollution Event

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SSRN 2022年

作者： Zhu, Yan Bai, Yongqing Xiong, Jie Zhao, Tianliang Xu, Jiaping Zhou, Yue Hu, Weiyang Sun, Xiaoyun Hubei Meteorological Service Center Wuhan430205 China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy Rain China Meteorological Administration Wuhan430205 China Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Climate Center Nanjing210044 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The rivers and lakes in the middle reaches of the Yangtze River Basin (MRYRB) form a unique underlying surface of dense "water network". However, the influence of such underlying surface on the regional atmospheric environment in inland humid regions is not fully understood. In this study, the WRF Model with Chemistry were used to simulate a heavy pollution event under stable weather conditions in the MRYRB. On this basis, the regulating effects of different types of lake groups, such as centralized big lakes (CBLs) and discrete small lakes (DSLs) on the variation of regional PM2.5 concentration in the Twain-Hu Basin (THB) were clarified. The results show that the underlying surface of dense "water network" in the THB generally decreases the regional PM2.5 concentration, but the influences of different lake-group types are not uniform in the spatial distribution. The CBLs can reduce the PM2.5 concentration over the lake and its surroundings by 6.24%–9.60%. The vertical impacts on PM2.5 are concentrated within 1.5 km, and the PM2.5 concentration can be reduced by 9%–14% under the height of 500 m. The ability of DSLs in reducing PM2.5 pollution is relatively weak, and the influences are between −1.75% and 1.17%. Thermal factor and water vapor related factors are the key meteorological factors affecting the variation of regional PM2.5 concentration over the underlying "water network" surface. The warming (humidification) effects of such underlying surface contribute positively (negatively) to the "purification" of air pollution, where the contribution of thermal factor is stronger. The relative contributions of thermal factors (water vapor related factors) are 52.48% (43.91%) for CBLs, and 65.96% (27.31%) for DSLs, respectively. The "purification" effect of the underlying surface with dense "water network" in the THB on regional air pollution highlights the importance of environmental protection of inland rivers and lakes in regional environmental governance. © 2022, T

关键词： Lakes