Clay that contains kaolinite has been used extensively as a raw material for manufacturing of bricks and china at 900-1100 degrees C. This study used clay to stabilize the contaminant chromium(VI) [Cr(VI)] through a heating process at 500-1100 degrees C. X-ray absorption spectroscopic results indicated that the 500-900 degrees C heating process transformed hazardous Cr(VI) to nontoxic Cr(III); Cr2O3 was the species detected as most abundant. The 1100 degrees C heating process caused the formation of Cr2SiO5, which was not detected in the samples heated at 500-900 degrees C. Fourier transformed extended X-ray absorption fine structure spectra were fitted by use of WinXAS software. Phase shifts and backscatter(ing) amplitudes for specific atom pairs, based on the crystallographic data for CrO3 and Cr2O3, were theoretically calculated with the FEFF software. The processed XAS data show that the first shell coordination numbers were similar to each other as the temperature was increased from 500 to 900 degrees C and 1100 degrees C, implying that their Cr(III) crystallite size was relatively similar. The interatomic distance between the target center element and the first shell for the 500-1100 degrees C samples was 1.98 A. The Debye-Waller factor for the 1100 degrees C sample was increased compared with the 500 and 900 degrees C samples and probably indicates the formation of Cr2SiO5.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/10473289.2005.10464641 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Degradation of Aflatoxin B in Corn by Water-Assisted Microwave irradiation and its kinetic.
Toxicon
January 2025
College of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China. Electronic address:
Aflatoxin B (AFB) is a highly toxic, carcinogenic, teratogenic, and mutagenic mycotoxin commonly found in corn. In this work, water-assisted microwave irradiation (WMI) was used to degrade AFB in corn, during which the influencing factors and kinetics of AFB degradation were also studied. The results showed that the degree of corn crushing, the heating rate of WMI, the temperature of WMI, the solid-liquid ratio, the initial content of AFB and the microwave power were all important factors affecting the degradation of AFB.
View Article and Find Full Text PDFUltrasound-assisted heat treatment: Accelerating rice glutelin fibrils formation and enhancing emulsifying properties.
Int J Biol Macromol
January 2025
College of Food Science and Engineering, Bohai University, National R&D Branch Center of Surimi and Surimi Products Processing, Jinzhou, Liaoning 121013, China. Electronic address:
The self-assembly of rice glutelin (RG) into RG fibrils (RGFs) represents a promising strategy for enhancing its functional properties. In this study, we investigated the effects of ultrasonic pretreatment on the fibrillation kinetics, structural characteristics, and functional properties of RGFs. The results indicated that ultrasonic pretreatment facilitated the unfolding of RG, resulting in an increased H and β-sheet, thereby accelerating the formation of RGFs and enhancing the fibril conversion rate.
View Article and Find Full Text PDFStructural and functional modifications of quinoa protein via hyaluronic acid-induced Maillard reaction.
Int J Biol Macromol
January 2025
Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China; School of Basic Medicine, Chengdu University, Chengdu 610106, PR China. Electronic address:
In recent years, quinoa protein (QP) has attracted attention for its balanced amino acids composition, but its limited techno-functional properties continue to pose challenges for its utilization. Non-enzymatic Maillard glycation is considered as a promising strategy to expand the utilization of plant proteins in food processing due to its cost-effectiveness, spontaneous nature, and the lack of need for additives to initiate the reaction. Furthermore, the use of hyaluronic acid (HA) as an ingredient in food products is becoming increasingly accepted and popular.
View Article and Find Full Text PDFImprovement of the Thermoelectric Properties in CNT/BiTe Composite Films Due to Evolution of the Depletion Layer and Point Defects under the Pulse Current Field.
ACS Appl Mater Interfaces
January 2025
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China.
A carbon nanotube (CNT) composite is an effective method to improve the thermoelectricity of materials. However, the depletion layer between the CNT and thermoelectric (TE) material always decreases the contribution of CNT to the conductivity of the TE material. It is important to eliminate the depletion layer for improving the TE properties.
View Article and Find Full Text PDFPolar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere.
Nat Commun
January 2025
Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland.
Solar driven energetic particle precipitation (EPP) is an important factor in polar atmospheric ozone balance and has been linked to ground-level regional climate variability. However, the linking mechanism has remained ambiguous. The observed and simulated ground-level changes start well before the processes from the main candidate, the so-called EPP-indirect effect, would start.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!