Carbide slag (CS) is a kind of solid waste generated by the hydrolysis of calcium carbide for acetylene production. Its major component is Ca(OH), which shows great potential in CO mineralization to produce CaCO. However, the types of impurities in CS and their mechanisms for inducing the morphological evolution of CaCO are still unclear. In this work, the influence of impurities in CS on the morphology evolution of CaCO was investigated. The following impurities were identified in the CS: AlO, MgO, FeO, SiO and CaCO. Ca(OH) was used to study the influence of impurities (AlO and FeO) on the evolution of CaCO morphology during CS carbonation. Calcite (CaCO) was the carbonation product produced during CS carbonation under varying conditions. The morphology of calcite was changed from cubic to rod-shaped, with increasing solid-liquid ratios. Moreover, rod-shaped calcite was converted into irregular particles with increasing CO flow rate and stirring speed. Rod-shaped calcite (CaCO) was formed by CS carbonation at a solid-liquid ratio of 10:100 under a stirring speed of 600 rpm and a CO flow rate of 200 ml/min; and spherical calcite was generated during Ca(OH) carbonation under the same conditions. AlO impurities had negligible effects on spherical CaCO during Ca(OH) carbonation. In contrast, rod-shaped CaCO was generated by adding 0.13 wt% FeO particles, similar to the content of FeO in CS. Rod-shaped calcite was converted into particulate calcite with increasing FeO content. The surface wettability and surface negative charge of FeO appeared to be responsible for the formation of rod-shaped CaCO. This study enhances our understanding and utilization of CS and CO reduction and the fabrication of high-value rod-shaped CaCO.
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http://dx.doi.org/10.1016/j.jenvman.2024.121361 | DOI Listing |
ACS Omega
January 2025
Sichuan Geological Environment Survey and Research Center, Chengdu 610081, P. R. China.
In the long and complex process of geological evolution, the rise of the Himalayan movement and the strong Quaternary glacial movement 400,000 years ago have shaped the highly distinctive travertine landform landscape of Huanglong, China. The overflow of karst water in the high travertine layer has formed magnificent waterfalls and wonderful karst caves as well as the world's largest open-air travertine beaches and pools. The unique travertine landscape has entered the public's vision.
View Article and Find Full Text PDFInt J Food Microbiol
February 2025
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address:
Epithelial tissues in vitro undergo dynamic changes while differentiating heterogeneously on the culture substrate. This gives rise to diverse cellular arrangements which are undistinguished by conventional analysis approaches, such as transepithelial electrical resistance measurement or permeability assays. In this context, solid substrate-based systems with integrated electrodes and electrochemical impedance monitoring capability can address the limited spatiotemporal resolution of traditional porous membrane-based methods.
View Article and Find Full Text PDFRapid Commun Mass Spectrom
March 2025
School of Earth, Environment & Society, McMaster University, Hamilton, Ontario, Canada.
Rationale: Carbonate minerals are one of the most popular samples for an automated sample preparation system for CF-IRMS, such as GasBench II and iso FLOW, but no standardized analytical protocols exist. This study gives guidelines on optimal analytic conditions for carbon and oxygen isotope analysis of Ca-Mg carbonates when using the carbonate-phosphoric acid reaction method.
Methods: Calcite (CaCO-McMaster Carrara), dolomite (CaMg(CO)-MRSI Dolomite), and magnesite (MgCO-ROM Brazil Magnesite) with two grain size fractions (< 74 and 149-250 μm) were reacted with 103% (specific gravity of 1.
Biology (Basel)
November 2024
Department of Ocean Sciences, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea.
Organisms occupy diverse ecological niches worldwide, each with characteristics finely evolved for their environments. Crustaceans residing in deep-sea hydrothermal vents, recognized as one of Earth's extreme environments, may have adapted to withstand severe conditions, including elevated temperatures and pressure. This study compares the exoskeletons of two vent crustaceans (bythograeid crab sp.
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