Article
Environmental Studies
Ahmed Eteba, M. Bassyouni, Mamdouh Saleh
Summary: Complex dyes have a negative impact on the environment and are difficult to remove using traditional methods. A series of experiments was conducted to determine the optimal parameters for the removal of direct blue 78 dye using chemically treated coal fly ash (TCFA). A pilot plant was designed and implemented to investigate the ability of TCFA to remove pollutants from textile wastewater. Various physical and chemical analyses were conducted on the fly ash. The results showed that chemical treatment significantly improved the properties of the fly ash. Batch adsorption experiments demonstrated that TCFA was effective in removing dyes under optimal conditions.
ENERGY & ENVIRONMENT
(2022)
Article
Environmental Sciences
Zawar Hussain, Hao Zhang, Na Chang, Haitao Wang
Summary: In this study, waste coal fly ash (CFA) was modified using a multi-step base-acid-base method to produce innovative flocculant porous particles. The results showed that the modified particles had a larger surface area, leading to enhanced adsorption of heavy metal ions.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Energy & Fuels
Junke Zhang, Kejun Wen, Lin Li
Summary: The study used bacteria to bio-modify coal fly ash and found that some metals leaching concentrations decreased while others increased after bio-modification. The increase in pH and carbonate production during bio-modification contributed to the stabilization of certain metals, while organic products and carbonates competition promoted the leaching of other metals.
Article
Engineering, Environmental
Xuezhong Zhang, Jianfei Yu, Baosheng Jin, Yaji Huang, Zhifei Wang
Summary: This study successfully increased the adsorption capacity of raw coal fly ash (CFA) for PbCl2 through thermal alkali modification, and confirmed that the formation of hydroxysodalite improved the pore structure properties of the sorbent. Additionally, the modified CFA also exhibited excellent adsorption performance for Zn and Cr. This research is significant for the development of environmentally friendly sorbents in the future.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Construction & Building Technology
Wenxing Wang, Shihao Guo, Xiaowei Gu, Xiaohui Li, Weiyu Huang, Ang Li
Summary: This study proposes a feasible biomodification treatment on coal fly ash (CFA) using Paenibacillus mucilaginosus, which improves the reactivity of CFA. The bio-modified CFA (BCFA) exhibits enhanced reactivity and mechanical properties in cementitious composites.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
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
Engineering, Environmental
Donata Drapanauskaite, Kristina Buneviciene, Manoj Silva, Alvyra Slepetiene, Jonas Baltrusaitis
Summary: Anthropogenic solid waste can be a reactive substrate to adsorb and immobilize PO43- for enhancing sustainability. In this study, two types of calcium-rich solid waste were evaluated for their ability to adsorb PO43- from simulated wastewater streams, showing promising results. The release of heavy metals into the simulated wastewater was assessed and only one type of waste exceeded regulated concentrations.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Hongmei Cui, Ling Yin, Xing Huang, Zhongchen Yu, Ziliang Zhang, Zhonghua Dai
Summary: This study proposes an enhanced coagulation model using zeolite as a crystal nucleus to promote flocs. Zeolite is prepared from fly ash by microwave-assisted hydrothermal synthesis and characterized using SEM, XRD, BET analysis. The results show improved surface properties and adsorption capacity of ZFA as a crystal nucleus, leading to higher oil content and SS removal rate compared to conventional coagulation. The optimal conditions for ZFA-enhanced coagulation are identified.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Liqiang Qi, Xu Wang, Wen Wang, Jingxin Li, Yan Huang
Summary: The pyrite-modified fly ash mercury adsorbent shows promising performance in mercury removal, with an adsorption rate of up to 91.92%. The adsorption process is mainly influenced by chemisorption. Through characterization techniques and experiments, optimal operating conditions and adsorption mechanisms were identified.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Jiabin Chen, Renjie Yang, Zhiyong Zhang, Deyi Wu
Summary: The study on defluorination by aluminum hydroxide-coated zeolite (AHZ) synthesized from coal fly ash showed that AHZ has a high adsorption capacity and efficiency for removing fluoride, with the adsorption mechanism involving ligand exchange with hydroxyl groups.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Ya Shi, Liwa Ma, Shan Hou, Miao Dou, Yongfei Li, Weichao Du, Gang Chen
Summary: In this study, rice straw was successfully modified to enhance its adsorption rate for crude oil, demonstrating its potential application in treating oilfield wastewater with high crude oil content. Characterization methods such as contact angle test further confirmed the hydrophobicity of the modified rice straw.
Article
Environmental Sciences
Wen Wang, Liqiang Qi, Pan Zhang, Jichen Luo, Jingxin Li
Summary: This study reports the preparation of magnetic coagulants (Fe-AFA, Fe-BFA) using acid-modified and base-modified fly ash as adsorbents for chemical oxygen demand (COD) in desulfurization wastewater. The adsorption kinetics and mechanism were investigated using various characterization techniques. Fe-AFA exhibited the best COD adsorption performance and superparamagnetism. The quasi-second-order kinetic and Langmuir equation were found to describe the COD coagulation process. The reusability of magnetic coagulants was also studied.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Nannan Wang, Xiyu Sun, Qiang Zhao, Peng Wang
Summary: The modification of raw coal fly ash by H2SO4 impregnation enhances its catalytic potential, while microwave pre-enhancement can significantly increase the generation of center dot OH. Under optimal experimental conditions, ACFA shows good removal efficiency for PAM in PW.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Shuo Yang, Shaohui Wang, Yudong Fu, Jie Cui, Yupeng Zhang, Yumeng Wang, Yuhang Wang, Xi Wang
Summary: In this study, ash deposition samples from a one-dimensional furnace were analyzed using electron microscopy (EM), scanning electron microscopy/energy dispersive scanning (SEM/EDS), and X-ray diffraction (XRD) at three sampling points with different temperatures. The effects of different addition ratios of coal fly ash (CFA) on the characteristics of biomass combustion ash deposition and the heterogeneous removal of gas phase alkali metal were investigated.
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.
