Coal Fly Ash Ceramics: Preparation, Characterization, and Use in the Hydrolysis of Sucrose

Abstract

Coal ash is a byproduct of mineral coal combustion in thermal power plants. This residue is responsible for many environmental problems because it pollutes soil, water, and air. Thus, it is important to find ways to reuse it. In this study, coal fly ash, obtained from the Presidente Médici Thermal Power Plant, was utilized in the preparation of ceramic supports for the immobilization of the enzyme invertase and subsequent hydrolysis of sucrose. Coal fly ash supports were prepared at several compaction pressures (63.66–318.30 MPa) and sintered at 1200°C for 4 h. Mineralogical composition (by X-ray diffraction) and surface area were studied. The ceramic prepared with 318.30 MPa presented the highest surface area (35 m2/g) and amount of immobilized enzyme per g of support (76.6 mg/g). In assays involving sucrose inversion, it showed a high degree of hydrolysis (around 81%) even after nine reuses and 30 days' storage. Therefore, coal fly ash ceramics were demonstrated to be a promising biotechnological alternative as an immobilization support for the hydrolysis of sucrose.

Investigation of Structural, Morphological, Resistivity of Novel Electrical Insulator: Industrial Wastes

“…Absorption band ensue at 1117 cm -1 wave number is attributed to Si-O band and signifies the occurrence of silicate groups. Presences of Al 3+ O 2absorption bands are also indicated near 907 cm -1 wave number [17].…”

Highly Effective Adsorption Process of Ni(II) Ions with the Use of Sewage Sludge Fly Ash Generated by Circulating Fluidized Bed Combustion (CFBC) Technology

“…According to the literature, smaller particles have the ability to dissolve or suspend in solutions more quickly and form a more stable suspension compared to larger ones. Additionally, smaller particles obtain higher adsorption in metal ion binding processes [ 24 , 35 ].…”

Effects of Microwave Energy on Fast Compressive Strength Development of Coal Bottom Ash-Based Geopolymers

“…While the weight loss in Region I was primarily due to the evaporation of the physically bonded water, the loss of the chemically bonded water was mainly responsible for the weight loss in Region II, and the weight loss in the high-temperature range in Region III was attributed to dehydroxylation 15,29 . Additionally, it would be reasonable to ascribe the weight loss by LOI of the sample (=1.3%) to Region III because the decomposition of calcium compounds and combustion of residual would have occurred above 430 °C 30 . When the temperature increased to 984 °C, the residual weight reached 83.9%, and there was no additional weight change.…”