Article
Environmental Sciences
Xin Zhao, Hanghang Zhao, Xunrong Huang, Lu Wang, Fuhao Liu, Xiongfei Hu, Jingtian Li, Guibin Zhang, Puhui Ji
Summary: The study prepared modified coal fly ash (NMFA) through sodium hydroxide treatment using a low-temperature hydrothermal method. The optimal conditions for Cd2+ adsorption by NMFA were found to be ash to base ratio of 5:5, calcination temperature of 200 degrees C, and calcination time of 3 h. Characterization results confirmed the crucial role of functional groups such as Si-O, Al-O, and Fe-O in Cd2+ removal.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
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
Green & Sustainable Science & Technology
Lu Wang, Xunrong Huang, Jianxin Zhang, Feng Wu, Fuhao Liu, Hanghang Zhao, Xiongfei Hu, Xin Zhao, Jingtian Li, Xundiao Ju, Puhui Ji
Summary: This study investigated the re-use of fly ash from coal-fired power plants for the adsorption of Pb(II). The modified fly ashes showed significantly increased surface area and improved affinity for Pb(II) compared to raw fly ashes. They were found to be effective in adsorptive stabilization of Pb(II) from waste water and contaminated soil, indicating their potential for resource recycling and cleaner production.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Yue Yang, Lu Wang, Hanghang Zhao, Fan Yan, Shaohua Li, Bin Guo, Chi Lue, Xuniong Huang, Puhui Ji
Summary: This study used one-step modification of fly ash to generate modified fly ash with high adsorption capacity for removing heavy metals from aqueous solutions. The modified fly ash showed a destroyed surface structure, 12 times increase in specific surface area, and successful adsorption of metal ions. The adsorption effects were influenced by pH, ionic strength, and co-existing cations. The adsorption mechanisms were ion exchange, electrostatic attraction, and complexation. The modified fly ash also showed the ability to release absorbed heavy metal ions in organisms and aquatic environments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Energy & Fuels
Shenghui Yu, Cheng Zhang, Lun Ma, Peng Tan, Qingyan Fang, Gang Chen
Summary: Coal combustion is a major pathway for lead entering the ecological environment, and fly ash cenospheres (FACs) prepared from waste of coal-fired power plants are ideal materials for Pb sorbents due to their high strength, light weight and low price. The adsorption and reaction mechanisms of FACs and several Si-Al-based sorbents for Pb vapors were studied at high temperatures, showing that FACs have the highest adsorption capacity.
Article
Environmental Sciences
Dong Xu, Puhui Ji, Lu Wang, Xin Zhao, Xiongfei Hu, Xunrong Huang, Hanghang Zhao, Fuhao Liu
Summary: The study found that artificial zeolite has a significant stabilizing effect on Cd, while modified fly ash performs better in reducing the bioavailability of Pb. Additionally, there was a significant improvement in the richness of soil microbial communities in the amended soils.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Engineering, Environmental
Wen Wang, Liqiang Qi, Jiahao Zhang
Summary: This study investigated the adsorption capabilities of acid-modified fly ash for escaped ammonia (NH3) and its impact on specific resistance. The results showed that acid activation improved the specific surface area and porosity of fly ash, leading to enhanced NH3 adsorption performance. Sulfuric acid-modified fly ash exhibited the highest adsorption capacity and maintained good specific resistance characteristics, indicating its potential application in flue gas treatment processes.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Chemistry, Physical
Gabriela Buema, Nicoleta Lupu, Horia Chiriac, Gabriela Ciobanu, Roxana-Dana Bucur, Daniel Bucur, Lidia Favier, Maria Harja
Summary: The study investigated five adsorbents based on NaOH-treated fly ash for the adsorption of cadmium ions from aqueous solutions. Results showed that the adsorption capacity of the new adsorbents improved significantly after NaOH treatment, with shorter equilibrium time. The adsorption process followed the pseudo second-order model, and the effectiveness of the adsorbents was evaluated using the TCLP procedure, recommending their potential use for wastewater treatment.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Review
Chemistry, Applied
Ayodele Akinterinwa, Usaku Reuben, Jamila Umar Atiku, Mustapha Adamu
Summary: Lead and cadmium, typical heavy metals, pose environmental and health risks when discharged indiscriminately. Starch derivatives adsorbents (SDAs) offer an economical and sustainable water treatment technique for removing heavy metal ions from water.
CARBOHYDRATE POLYMERS
(2022)
Article
Metallurgy & Metallurgical Engineering
Jiang Chun-lu, Wang Rui, Chen Xing, Zheng Liu-gen, Cheng Hua
Summary: Chitosan-coated fly ash (CWF) was prepared by the acid leaching-coating method, which showed larger surface roughness and more adsorption channels for the removal of Cr(VI) from water. The movement of Cr(VI) in solution was found to be a diffusion process from the main body of the liquid phase to the surface of the liquid film.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Environmental Sciences
W. Zhao, B. Wang, T. Zhang, T. Liu
Summary: In this study, modified fly ash adsorbent was prepared using domestic waste incineration fly ash as raw material and Ca(OH)(2) as modifier under the action of ultrasonic waves. The adsorption performance of modified fly ash on Pb2+ in solution was investigated and characterized using XRD, SEM and FTIR. The results showed that the amount of adsorbent added, reaction time, pH and the initial concentration of Pb2+ all affected the adsorption effect of modified fly ash on Pb2+.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Fan Yan, Hanghang Zhao, Fuhao Liu, Lu Wang, Xunrong Huang, Xin Zhao, Yue Yang, Jingtian Li, Guibin Zhang, Xundiao Ju, Feng Wu, Puhui Ji
Summary: This study developed a new material, modified fly ash (MFA), and investigated its remediation efficiency and safety for contaminated soils through pot experiments. The results showed that MFA effectively reduced the bio-available concentrations of cadmium and lead in soils and improved the growth environment for plants. MFA has great potential for soil remediation in different areas.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(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
Chemistry, Multidisciplinary
Liqiang Qi, Jichen Luo, Wen Wang, Weiyuan Zhao
Summary: This study investigates the modification of fly ash with NaOH and Ca(OH)(2) and discusses its feasibility in adsorbing SO2 from flue gas in an electrostatic precipitator (ESP). The optimal modification conditions are determined by comparing the changes in SO2 adsorption performance of different modified fly ashes. The effect of modification and adsorption of SO2 on the electrical conductivity of fly ash is also examined. The results show that Ca(OH)(2) modified fly ash has the best adsorption capacity for SO2 in flue gas, with an adsorption capacity of 31.44 mg/g, representing a 141.85% increase compared to raw fly ash. The modified fly ash exhibits improved conductivity and can be effectively removed during the dust removal stage.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Applied
M. W. Mofulatsi, E. Prabakaran, Tarisai Velempini, Ezekiel Green, Kriveshini Pillay
Summary: The study successfully synthesized and characterized MnO2-CFA as an effective adsorbent for lead ions, showing high selectivity towards Pb2+ and potential applications in latent fingerprint detection. Additionally, the spent adsorbent demonstrated promising labeling agent properties for long-lasting clear latent fingerprint images.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)