Article
Environmental Sciences
Anna Bourliva, Efstratios Kelepertzis, Lamprini Papadopoulou, Carla Patinha, Nikolaos Kantiranis
Summary: The aim of this study was to evaluate the bioaccessibility of arsenic in lignite fly-ash samples via ingestion and inhalation, and its contribution to total arsenic exposure. The results showed significant differences in the bioaccessibility of arsenic between oral and respiratory pathways, suggesting the presence of highly soluble arsenic-bearing phases in the fly-ash samples. The bioaccessibility rates in gastric fluids ranged from 45-73%, while the pulmonary bioaccessibility rates in artificial lung fluids exhibited significantly higher levels ranging from 86% to 95%.
Article
Environmental Sciences
Kyumin Jang, Won Yong Choi, Dongwook Lee, Jinwon Park, Yunsung Yoo
Summary: This study proposed a method for purifying landfill gas by utilizing CO2, involving the absorption of CO2 from landfill gas, extraction of calcium ions from fly ash, and formation of calcium carbonate. Different acids were used for calcium ion extraction, resulting in varying calcium ion recovery rates and different crystal structures of calcium carbonate. The results can be applied to various CO2 utilization processes based on landfill gas and fly ash from municipal solid waste incineration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Geosciences, Multidisciplinary
Virendra Kumar Yadav, Timsi Modi, Abeer Yousef Alyami, Amel Gacem, Nisha Choudhary, Krishna Kumar Yadav, Gajendra Kumar Inwati, Shivraj Gangadhar Wanale, Mohamed Abbas, Min-Kyu Ji, Byong-Hun Jeon
Summary: Coal fly ash is a global problem due to its large production volume and toxic heavy metals. However, it also contains valuable minerals and micro- to nano-structured materials that have potential applications in various industries. Recovering these particles from waste fly ash can make the process and remediation technology economically and environmentally friendly. This review focuses on the properties and applications of ferrospheres and plerospheres from fly ash.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Polymer Science
Kinga Plawecka, Patrycja Bazan, Wei-Ting Lin, Kinga Korniejenko, Maciej Sitarz, Marek Nykiel
Summary: The main aim of this research is to assess the suitability of different fly ashes as raw materials for manufacturing geopolymers. The study found that materials based on fly ashes had similar compressive strength but significant differences in flexural strength, with ultra-fine fly ash showing lower flexural strength. Process optimization is needed for materials based on a precursor from a waste incineration plant.
Article
Engineering, Environmental
Xue-Lei Duan, Chun-Gang Yuan, Kai-Qang He, Jie-Xuan Yu, Yang-Hong Jiang, Qi Guo, Yan Li, Su-Juan Yu, Jing-Fu Liu
Summary: In this study, CuCl2-modified halloysite nanotubes (CuCl2-HNTs) were successfully prepared as an adsorbent for the removal of arsenic from high-temperature coal combustion flue gas. The CuCl2-HNTs showed high arsenic adsorption capacity and tolerance to high concentrations of gases. The captured arsenic could be stable at high temperatures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Crystallography
Virendra Kumar Yadav, Krishna Kumar Yadav, Vineet Tirth, Ashok Jangid, G. Gnanamoorthy, Nisha Choudhary, Saiful Islam, Neha Gupta, Cao Truong Son, Byong-Hun Jeon
Summary: Coal fly ash (CFA) is a major global pollutant produced during the generation of electricity by thermal power plants. CFA contains value-added components such as cenospheres, which are widely utilized in ceramics, fireproofing materials, and wastewater treatment due to their lightweight nature and high mechanical strength.
Article
Engineering, Environmental
Sheila Gerardo, Artur R. Davletshin, Staci L. Loewy, Wen Song
Summary: This study investigates the microscale processes controlling the recovery of rare earth elements (REEs) from coal fly ash and reveals three distinct recovery mechanisms. The study emphasizes the critical role of the morphology and elemental makeup of the ash matrix in the accessibility of REEs, providing important knowledge for the design of cost-effective and environmentally friendly REEs recovery techniques.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Kai-Qiang He, Chun-Gang Yuan, Yang-Hong Jiang, Yan Li, Xue-Lei Duan, Qi Guo
Summary: A new and efficient adsorbent for gaseous arsenic capture in flue gas has been successfully developed in this study, with improved adsorption efficiency and reduced risk of secondary pollution.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Elzbieta Janowska-Renkas, Agnieszka Kaliciak
Summary: This article presents test results on the durability of cement-ash mortars under aggressive environmental impacts such as seawater, acid solutions, and carbonation. It was found that FBC ashes exhibit higher pozzolanic activity than CFA under normal conditions, and a mixture of FBC and CFA at 35% by mass each may be a favorable solution for future construction of coastal structures resistant to seawater.
Article
Chemistry, Multidisciplinary
Elena Fomenko, Natalia N. Anshits, Leonid A. Solovyov, Yuriy Knyazev, Sergey Semenov, Oleg A. Bayukov, Alexander G. Anshits
Summary: Characterization of magnetic particulate matter in coal fly ashes is crucial for evaluating health risks from industrial coal combustion and future applications. This study successfully separated magnetic narrow fractions related to hazardous PM2.5, PM2.5-10, and PM10 for the first time and identified their major components and phase composition. Mossbauer spectroscopy and magnetic measurements confirmed the formation mechanism of nanoscale epsilon-Fe2O3 particles.
Article
Chemistry, Multidisciplinary
Zili Zhang, Yao Lin, Jianwei Meng, Lei Wang, Qin Yao, Xiaohan Chen, Guodong Dai, Yi Zhao, Runlong Hao
Summary: This study investigated the effects of six types of fly ash on NO removal and characterized their micromorphology, elemental composition, and elemental oxidation states. The experimental results showed that high solubility is a prerequisite condition for fly ash to exhibit inhibitory effects on NO removal.
Article
Construction & Building Technology
Gopakumar Kaladharan, Farshad Rajabipour
Summary: This study systematically investigates the effects of SO3 type and content in fly ash on the performance of cement-fly ash pastes and mortars. It finds that the single SO3% limit of ASTM C618 is unable to capture the complexity and performance of fly ash. However, the poor performance observed can be mitigated using chemical admixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Environmental Sciences
Juili S. Mankar, Sadhana S. Rayalu, Rajasekhar Balasubramanian, Reddithota J. Krupadam
Summary: Cenospheres functionalized with imidazole and amine moieties have been found to have high selectivity for CO2 adsorption over N2 in simulated flue gas conditions. Despite a reduction in adsorption capacity with increased moisture content, the functionalized CS can be used repeatedly without loss of effectiveness. The estimated cost for CO2 capture using this system is lower than other existing absorption systems, making large scale manufacturing of CS materials a potential cost-effective solution for efficient CO2 capture from industrial flue gases.
Article
Chemistry, Analytical
Nana Wan, Qingyun Chang, Fangyuan Hou, Jie Li, Xiaohuan Zang, Shuaihua Zhang, Chun Wang, Zhi Wang
Summary: A triazine-based conjugated microporous polymer (TCMP) was synthesized and used as a fiber coating material for solid-phase microextraction (SPME) of halogens-containing environmental hormones. The TCMP showed strong adsorption capability due to various interactions. An analytical method combining TCMP coated fiber-based SPME with gas chromatography-electron capture detection was developed for the determination of twelve halogens-containing environmental hormones in vegetable and fruit samples. The method exhibited a wide linear range, low detection limits, and good recovery rates.
ANALYTICA CHIMICA ACTA
(2022)
Article
Energy & Fuels
Denitsa Apostolova, Irena Kostova, Achim Bechtel, Maya Stefanova
Summary: The study conducted the first thorough investigation of PAHs in feed coals and FAs from combustion in six Bulgarian TPPs, aiming to compare their geochemical compositions, track changes in PAHs compositions with different feed coal ranks and ESP rows, and estimate the potential toxicity of FAs. Results show variations in PAHs concentrations between feed coals and FAs, with combustion resulting in a shift towards lighter PAHs. PAH distributions in FAs are dominated by phenanthrene, and the presence of heavier PAH, benzo[g,h,i]fluoranthene, was only found in the finest particulate matter in the last row of ESP from Varna TPP.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)