Bio-calcium sulfate preparation from duck eggshell via chemical reaction process

Construction of Waste Chalk Powder into mpg-C3N4-CaSO4 as an Efficient Photocatalyst for Dye Degradation under UV–Vis Light and Sunlight

“…The observed intense and sharp diffraction peaks exhibited the crystalline nature of CaSO 4 NPs and indexed to the hexagonal phase (JCPDS #06-0226). 26,27 In addition, the relative intensity of mpg-C 3 N 4 -CaSO 4 -2 composite diffraction peak of 27.4 (002) become lower and the peak 12.9°(100) vanishes due to the incorporation of CaSO 4 NPs in mpg-C 3 N 4 inhibit the development of the crystal. 28,29 As a result, the average crystallite sizes of the materials was determined by using the Debye−Scherrer equation:…”

Sustainable Production and Physicochemical Characteristics of Calcium Sulfate Dihydrate Prepared from Waste Eggshells

“…Moreover, two different anhydrous polymorphs, β-CaSO 4 (insoluble anhydrite, natural anhydrite form) and γ-CaSO 4 (soluble anhydrite), were also reported [16]. The phase transformation, crystal structure, morphology, and growth rate of calcium sulfate depend on different physicochemical conditions, i.e., temperature, pressure, solutions, and other ionic minerals [17,18]. Calcium sulfates can be obtained from different preparation processes, i.e., formed from an aqueous sulfuric acid [19], flue gas desulfurization [20], reverse microemulsion [21], and chemical precipitation [22].…”

“…Calcium sulfates can be obtained from different preparation processes, i.e., formed from an aqueous sulfuric acid [19], flue gas desulfurization [20], reverse microemulsion [21], and chemical precipitation [22]. In turn, their characteristics (color, hardness, and density), crystal structure, solubility, optical property (translucence and refractive index), and applications depend on the preparation conditions [18].…”