scholarly journals Effect of Thermal Treatment on Natural Dolomite

2021 ◽  
Vol 2080 (1) ◽  
pp. 012009
Author(s):  
Siti Fatimah Azzahran Abdullah ◽  
Siti Shuhadah Md Saleh ◽  
Nur Farahiyah Mohammad ◽  
Mohd Sobri Idris ◽  
H. R. Saliu
Keyword(s):  
Thermal Decomposition ◽  
Thermal Treatment ◽  
Heating Rate ◽  
Calcium Oxide ◽  
High Intensity ◽  
Functional Group ◽  
Group Analysis ◽  
X Ray ◽  
Air Atmosphere ◽  
Functional Group Analysis

Abstract Dolomite is a mineral material that is formed from limestone which is mostly contains the calcite (CaCO3) and magnesite (MgCO3). This paper aimed to study on thermal decomposition of dolomite under air atmosphere. Calcination of dolomite was carried out by using furnace with heating rate of 10 °C/minute in an air atmosphere. The different temperature of calcination was varied at 400 °C, 600 °C, 800 °C, and 1000 °C within 6 hours. Phase analysis (XRD) and functional group analysis (FTIR) were carried out to analysis the dolomite after calcination. Microstructural (SEM) and Energy Dispersive X-ray (EDX) analysis showed that the main constituents of pure dolomite include CaCO3 (calcite), MgCO3 (magnesite), CaO, and MgO. From the results, XRD showed that the high intensity of CaO and MgO at 800 - 1000 °C was much stronger than that of dolomite at 400 - 600 °C. In addition, FTIR presents strong and intense bands are observed at 3632.23 and 3690.98 cm−1 (800 °C), and also 3694.03 and 3633.60 cm−1 (1000 °C) due to the calcium oxide.

scholarly journals Evidences of Microplastic in Air and Street Dust: A Case Study of Varanasi City, India

2022 ◽  
Author(s):  
Dipika Pandey ◽  
Tirthankar Banerjee ◽  
Neha Badola ◽  
Jaspal Singh Chauhan
Keyword(s):  
Functional Group ◽  
Group Analysis ◽  
Street Dust ◽  
X Ray ◽  
Functional Group Analysis ◽  
Suspended Dust ◽  
Negative Impacts ◽  
Living Organisms ◽  
Different Color

Abstract Microplastics (MPs) are ubiquitous in our environment. Its presence in air, water and soil makes it a serious threat to living organisms. The present study aimed to assess the availability of MPs in air and street dust of a metropolitan city Varanasi, India. Suspended dust samples and street dust samples were collected from various sampling sites. The assessment of MPs was conducted by for physical identification binocular microscopy, fluorescence microscopy and Scanning Electron Microscopy (SEM), while elemental analysis done by Energy Dispersive X-Ray Analysis (EDX). and finally, Fourier-transform infrared spectroscopy (FTIR) was used for functional group analysis. the presence of MPs in both suspended dust and street dust samples of all selected sampling sites was confirmed by results. MPs of different color with the shape of Fragments, Films, Spherules and Fibers were observed in the study. However, most of the MPs were less than 1mm in size. The MPs identified in our study were majorly polypropylene, polystyrene, polyethylene, polyethylene terephthalate, polyester, and polyvinyl chloride. EDX analysis showed presence of trace elements like aluminum, cadmium, magnesium, sodium, and silicon apart from carbon and oxygen, which indicates the presence of additives or adsorption capacity of MPs. Confirmation of MPs in the air of a locality of Varanasi explains the need of deep research in this concerned field to protect our future from negative impacts of breathing MPs.

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