Article
Engineering, Chemical
Kezhou Yan, Jiyuan Zhang, Dandan Liu, Xiang Meng, Yanxia Guo, Fangqin Cheng
Summary: A feasible method for synthesizing magnetic zeolite from industrial solid wastes (red mud and coal gangue) was proposed. The preparation conditions, formation mechanism, and adsorption performance of the magnetic zeolite were investigated. The prepared magnetic zeolite showed excellent adsorption capacity and reusability for heavy metals.
Article
Construction & Building Technology
Zengqing Sun, Qingyu Tang, Buhle Sinaye Xakalashe, Xiaohui Fan, Min Gan, Xuling Chen, Zhiyun Ji, Xiaoxian Huang, Bernd Friedrich
Summary: Efforts have been made to produce feasible red mud geopolymers as construction material, but their environmental compatibility has not been clearly investigated. This study explores the release characteristics of various chemical components from red mud geopolymers and reveals that some of these components exceed the environmental regulatory limits in certain cases.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Yuxuan Jin, Ze Liu, Le Han, Yanbo Zhang, Li Li, Siyu Zhu, Zhonghao Peng Jiaxing Li, Dongmin Wang
Summary: A novel coal-analcime composite adsorbent was successfully synthesized from coal gangue, enhancing the adsorption capacity of analcime for heavy metal ions. The modified coal loaded on the surface of analcime significantly improved the chemo-adsorption between heavy metal ions and the composite, with a maximum Pb2+ exchange capacity of 268 mg/g achieved.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Bing Bai, Fan Bai, Xianke Li, Qingke Nie, Xiangxin Jia, Haiyan Wu
Summary: This study investigates the treatment of heavy metal pollutants in water using red mud particle waste. The experiment explores the static adsorption of Pb2+ (or Cd2+ and Cu2+) by red mud particles and examines the effects of various factors on the adsorption performance. The results indicate that red mud particles exhibit different adsorption strengths for different heavy metal ions, with Pb2+ showing the highest adsorption capacity. Increasing the temperature enhances the adsorption of heavy metal ions. The preferred adsorption sequence of red mud under competitive conditions is Pb2+, Cd2+, and then Cu2+.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Engineering, Environmental
Shucai Li, Jian Zhang, Zhaofeng Li, Chao Liu, Jingpeng Chen
Summary: A new type of red mud/slag/wastewater-based geopolymeric grouts (RSW) was prepared in this study, showing that wastewater can accelerate the geopolymerization process of RSW and have a good immobilization effect on heavy metals. Additionally, RSW has higher mechanical strength compared to cement-based grouts.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Joao Carvalheiras, Rui M. Novais, Joao A. Labrincha
Summary: The study synthesized geopolymer monoliths using metakaolin and red mud as solid precursors, which have hierarchical porosity and suitable compressive strength, making them effective bulk-type sorbents for heavy metal removal. The use of red mud-containing geopolymer monoliths in extracting lead from wastewater was evaluated, and the results showed high lead removal capacity and successful regeneration for multiple sorption cycles. These findings contribute to the potential industrial application of clay derived geopolymers in wastewater treatment and provide a sustainable recycling strategy for red mud waste.
APPLIED CLAY SCIENCE
(2023)
Article
Construction & Building Technology
Deluan Feng, Jie Wang, Dongyao Chen, Wenjuan Hou, Shihua Liang
Summary: In this study, MSWI FA was used as a component to supplement the missing element of Ca in CG to synthesize CG-MFG. The test results showed that MSWI FA effectively improved the strength of CG-MFG and immobilized heavy metals. The energy consumption and carbon dioxide emission of CG-MFG were much lower than OPC, indicating its potential as a substitute for cement in the construction industry.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Ling Long, Yimeng Zhao, Guojun Lv, Yin Duan, Xiaobo Liu, Xuguang Jiang
Summary: This study investigated an innovative and improved method for stabilization/solidification (S/S) of municipal solid waste incineration fly ash (MSWI FA) using coal gangue based geopolymer with the addition of active calcium content. The results showed that the addition of calcium oxide significantly increased compressive strength and achieved the highest immobilization efficiencies of heavy metals. Various analytical techniques were used to confirm the formation of calcium-containing hydration products after the improvement of calcium content in the binder. The study demonstrated that the incorporation of active calcium content can efficiently improve the S/S treatment of hazardous ash waste such as MSWI FA.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Jian Zhang, Yifan Gao, Zhaofeng Li, Chuan Wang
Summary: A green geopolymer composite was prepared using red mud and granulated blast furnace slag to improve the utilization rate of red mud for heavy metal solidification and grouting engineering. The mechanical strength, leaching characteristics, and immobilization mechanisms of the geopolymer grouts were investigated through various analytical techniques, showing the involvement of red mud in the geopolymerization reaction and the effects of Pb2+ and Cr3+ on the mechanical strength. The results also demonstrate the successful immobilization of Pb2+ and Cr3+ through chemical bonding and physical sealing.
Article
Environmental Sciences
Govindan Rajivgandhi, Balasubramanian Mythili Gnanamangai, Govindan Ramachandran, Gnanasekaran Chackaravarthy, Chenthis Kanisha Chelliah, Muthuchamy Maruthupandy, Naiyf S. Alharbi, Shine Kadaikunnan, Wen-Jun Li
Summary: This study focused on screening heavy metal resistant actinomycete strains from contaminated soil samples, identifying Nocardiopsis dassonvillei as a highly resistant strain. Through various experiments, it was confirmed that Nocardiopsis dassonvillei produces high bioflocculent and exopolysaccharide, with a strong heavy metal sorption ability against Cd, Cr, Pb, and Hg. Moreover, the study suggests that Nocardiopsis dassonvillei could serve as an excellent biological source for heavy metal reduction in waste water, providing an alternative method for effective removal of heavy metals towards sustainable environmental management.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Wen-ting Zhao, Huan Zhang, Ke Feng, Tian-yang Wang, Lei Han, Hai-Feng Xing, Fei Huang, Wen-bo Wang
Summary: A new strategy called "one stone, three birds" was proposed for the value-added disposal of solid waste coal gangue (CG), synthesis of high-quality adsorbent, and efficient decontamination of pollutants. The porous polymetallic silicate adsorbent (HECCGA8h) was synthesized through a one-step hydrothermal process using metal ions extracted from calcined coal gangue (CCG). The adsorbent exhibited high adsorption capacity for methylene blue (MB) and Cd(II), with removal rates of 99.8% and 99.42% for MB in Yangtze River water and seawater, respectively, and removal rates of 99.11% and 92.52% for Cd(II) in Yangtze River water and seawater, respectively. Thermokinetic analysis showed that the adsorption of MB was spontaneous and endothermic, driven by the synergism of hydrogen bond, electrostatic attraction, and ion exchange, while the adsorption of Cd(II) was spontaneous and exothermic, driven by complexation and ion exchange between the adsorbent and Cd(II). This research provides a novel approach for waste treatment and resource recovery.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Xianyao Ma, Defu Xu, Yingxue Li, Zuochen Ou, Alan Howard
Summary: A new geopolymer made from foundry dust was developed in this study and it showed excellent adsorption properties for Pb2+ and Ni2+ in water, with improved pore structure and increased specific surface area.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Oana Stoian, Cristina Ileana Covaliu, Gigel Paraschiv, Gina-Alina Catrina (Traistaru), Mihai Nita-Lazar, Ecaterina Matei, Sorin Stefan Biris, Paula Tudor
Summary: This article presents a nonconventional method using magnetite nanomaterial for efficient removal of lead ions from industrial wastewater. The experimental results show that the efficiency is highest at pH 6, impacted by both lower and higher pH values. Langmuir and Freundlich models were used to describe the adsorption process.
Article
Construction & Building Technology
Wei Song, Tiantian Guo, Pengju Han, Xiaoyuan Wang, Fuli Ma, Bin He
Summary: The physical and mechanical properties of geopolymer concrete synthesized from red mud and coal metakaolin were tested and compared with ordinary silicate cement concrete in sulfate environments. The study found that the stability and compressive strength of geopolymer concrete were significantly better than that of ordinary silicate cement concrete in sulfate environments.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Joao Carvalheiras, Ines E. Oliveira, Ricardo M. Silva, Rui F. Silva, Rui M. Novais, Joao A. Labrincha
Summary: This study reports for the first time the synthesis and growth of carbon nanotubes on red mud, utilizing the iron present in the waste material and avoiding the use of commercial catalysts. The modified materials showed remarkable lead removal capacity.
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)