Article
Construction & Building Technology
Saif Al-Shmaisani, Ryan D. Kalina, Raissa Douglas Ferron, Maria C. G. Juenger
Summary: The availability of traditional siliceous Class F fly ash is decreasing as countries switch to renewable energy sources. To extend the availability of siliceous fly ash, suppliers are distributing blended coal ashes and incorporating other coal combustion products (CCPs) or natural pozzolans. While the characteristics of these blended fly ashes may differ, they perform well in cement-based mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Ewelina Grabias-Blicharz, Rafal Panek, Malgorzata Franus, Wojciech Franus
Summary: Mechanically treated fly ash was used to provide Al and Si atoms for zeolite synthesis. The combination of mechanical activation and hydrothermal synthesis improved the dissolution of activated fly ash and the crystallization of zeolites. The obtained zeolite materials exhibited high crystallinity and a large specific surface area. This study provides important data for utilizing fly ash resources and synthesizing practical zeolites.
Article
Chemistry, Multidisciplinary
Sifani Zavahir, Tasneem Elmakki, Nourhan Ismail, Mona Gulied, Hyunwoong Park, Dong Suk Han
Summary: This study demonstrates the successful degradation of a model contaminant, methyl orange, using a titanium nanotube array as a photocatalyst under simulated solar illumination. The nanotube array was synthesized by anodizing a titanium film in an electrolyte medium. The photocatalyst showed remarkable degradation kinetics and maintained its performance over multiple reaction cycles.
Article
Construction & Building Technology
E. R. Teixeira, A. Camoes, F. G. Branco
Summary: Sustainable construction is important, especially in terms of building materials. Using biomass fly ash as a cement replacement material in high-volume fly ash concrete can improve its properties and contribute positively to its quality, durability, and sustainability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Chemical
Yuan Shi, Kai-xi Jiang, Ting-an Zhang, Xiao-feng Zhu
Summary: This study proposes a new method for extracting titanium, iron, and alumina from coal fly ash, which can be done in one spot to increase efficiency and utilize electric energy effectively.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Chennian Yang, Jianbo Zhang, Xinjuan Hou, Shaopeng Li, Huiquan Li, Ganyu Zhu, Fang Qi
Summary: This study investigated the impurity elements in high-alumina coal fly ash (HAFA) and found the occurrence form and leaching behavior of iron and titanium, further confirming the difficulty of removing different impurity elements. The results provide theoretical support for the preparation of aluminum-silicon materials.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Construction & Building Technology
Mahdi Rafieizonooz, Elnaz Khankhaje, Shahabaldin Rezania
Summary: Coal power plant wastes and coal ash concrete have the potential to replace cement and fine aggregate, allowing for the production of sustainable and environmentally friendly concrete with reduced cost and natural resource utilization.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Yiqian Ma, Srecko Stopic, Buhle Xakalashe, Sehliselo Ndlovu, Kerstin Forsberg, Bernd Friedrich
Summary: A new processing technology using microwave heating and acidic extractants was developed to efficiently recover Al and Ti from coal fly ash, resulting in high extraction efficiencies for both metals through optimized baking and leaching parameters. This cleaner and more efficient approach transforms mullite in CFA to other compounds, allowing for the successful recovery and separation of Al and Ti from the leach solution.
Article
Construction & Building Technology
Bingchuan Cheng, Rentai Liu, Xiuhao Li, Enrique del Rey Castillo, Mengjun Chen, Shucai Li
Summary: Increasing FA/CBA values can improve the performance of backfill materials, but the excellent water retention of CBA may reduce drainage capacity. A 0.5% superplasticizer and a 30%-50% FA/CBA ratio can meet the requirements and have been applied in a filling mining project.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Zhikun Zhang, Yanli Wang, Yuqi Zhang, Boxiong Shen, Jiao Ma, Lina Liu
Summary: This study investigated the stabilization behavior of heavy metals in hazardous municipal solid waste incineration fly ash (FA) using coal fly ash (CFA) as an additive via hydrothermal treatment. The results showed that most heavy metals were stabilized in the hydrothermal product, and the addition of CFA resulted in the reduction of leaching concentrations and risk assessment code (RAC) of heavy metals. The method with 30% CFA exhibited the most superior performance.
Article
Construction & Building Technology
Jan Fort, Jiri Sal, Radek Sevcik, Magdalena Dolezelova, Martin Keppert, Milos Jerman, Martina Zaleska, Vojtech Stehel, Robert Cerny
Summary: The tightening of environmental standards in the EU presents a significant push towards the transition to a circular economy. However, the use of coal fly ash as partial cement replacement may face challenges in the future, leading to the consideration of biomass fly ash as a promising alternative.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Uddandarao Priyanka, Piet N. L. Lens
Summary: Inorganic-microbial hybrid systems integrate the light-harvesting properties of semiconductors with microbial cells to create sustainable, efficient, and versatile chemical synthesis platforms. This study demonstrates the use of light-driven photocatalytic semiconducting Aspergillus niger cells-ZnS nanoparticles for enhanced removal of the dye methyl orange.
Article
Engineering, Environmental
J. H. Potgieter, C. Pardesi, S. Pearson
Summary: The study found that coal fly ash is an effective adsorbent for removing methyl orange at neutral pH. Column adsorption configuration demonstrated the highest removal efficiency, achieving a removal rate of 99.95%. Economic analysis suggests that column operation is the most practical choice for implementation.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Environmental Sciences
Ying Jiang, An Liu
Summary: This study used TiO2 and cornstalk biochar to prepare biochar-TiO2 composites for treating methyl orange (MO) in water. The composites prepared using biochar generated at 700℃ and a TiO2/biochar mass ratio of 0.75/1 showed the best performance on MO decolorization and mineralization efficiency. Factors such as low pH, low initial MO concentration, and 1 g/L of composite amount added enhanced MO degradation efficiency. The biochar-TiO2 composites were easier to separate from water compared to pure TiO2, benefitting their recycling after application.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Sepehr Seyedian Choubi, Cagla Meral Akgul
Summary: This study investigates the impact of heat exposure on the performance of alkali-activated coal fly ashes (AAF). The results show that the mechanical performance varies depending on the exposure temperature and intrinsic properties of the activated ashes. Low-Ca AAFs are found to be more stable compared to high-Ca AAFs. Heat exposure also significantly reduces the thermal conductivity and volumetric specific capacity of all AAFs.
JOURNAL OF BUILDING ENGINEERING
(2022)