Article
Environmental Sciences
Hua Tian, David J. Williams, Keith Mandisodza, Chenming Zhang, Sebastian Quintero Olaya, Wenqiang Zhang, Chongyi Tang
Summary: The basic engineering parameters of fine-grained red mud tailings were evaluated through laboratory tests. The effect of mineralogy and microstructure was investigated by analyzing the stress-deformation characteristics. The static and seismic liquefaction susceptibilities were evaluated using critical state soil mechanics and empirical equations respectively. Results showed the presence of cementitious minerals and the absence of swollen clay minerals. The textural and compression properties were similar to clays, while the strength parameters resembled sand. The stress-deformation curves exhibited overall strain softening with initial strain hardening, which was attributed to the coupled effect of microstructure and mineral components. Hydroxysodalite precipitated at the contact points among particles provided microstructural cementation bonds, enabling the aggregates to resist external loads during the initial loading stage. Red mud demonstrated high resistance to static liquefaction but had the potential for seismic liquefaction.
INTERNATIONAL JOURNAL OF MINING RECLAMATION AND ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
D. Wang, L. Luo, Y. Chen, S. Chen, X. Qiu, M. Liu
Summary: Fluorine pollution is a significant global concern that has adverse effects on aquatic organisms and human life. This study demonstrates that solid waste of red mud from the aluminum industry can be converted into efficient fluoride adsorbents by incorporating cerium-based compounds. The optimized red mud-derived fluoride adsorbents exhibit high adsorption capacity and can effectively treat heavily fluorinated wastewater.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Qiuzhun Chen, Dong Wang, Chuan Gao, Bin Wang, Shengli Niu, Gaiju Zhao, Yue Peng, Junhua Li, Chunmei Lu, John Crittenden
Summary: Activated red mud (RM) showed potential for selective catalytic reduction (SCR) of NOx, but its low reducibility and acidity constrained its low-temperature activity. In this study, cerium-tungsten oxide was used to reconfigure the redox and acid sites of RM-based catalyst, resulting in a high NOx conversion at temperatures ranging from 219 to 480 degrees C. The presence of Ce3+/Ce4+ redox pairs enhanced the adsorbed oxygen and promoted redox reactions, while positive interactions between Ce, W species, and Fe oxide facilitated the activation of NH3 species. The reconfigured catalyst provided abundant Brt nsted and Lewis acid sites, promoting the SCR reaction through Langmuir-Hinshelwood and Eley-Rideal mechanisms.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
Himanshu Tanvar, Brajendra Mishra
Summary: The study introduces a hydrometallurgical flowsheet for separating red mud elements and recovering high purity iron (II) product, addressing the challenges of high alkalinity and multiple elements by utilizing mild preprocessing and UV light-assisted photochemical reduction.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Junhui Xiao, Nanlan Zhong, Deqiang Gao, Kai Zou, Zhen Wang, Wenxiao Huang, Wenliang Xiong
Summary: The efficient extraction of iron from Bayer red mud using roasting and magnetic separation has been investigated, resulting in the recovery of a high-purity iron concentrate.
Article
Environmental Sciences
Dandan Huang, Yanxiu Wang, Chengwen Wang, Le Tao, Xiangsong Meng, Li Wang, Wei Sun
Summary: In this study, the distribution patterns of different particle sizes of red mud were analyzed using TIMA and EDS, and the alkali removal performance was compared under high temperature grading. The results showed that non-clay phases in the particles coagulate with clay phases, forming a mixture phase with impurities. The high-temperature grading effectively separated the elements and phases, promoting the comprehensive utilization of red mud.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Engineering, Chemical
Shrey Agrawal, Nikhil Dhawan
Summary: Red mud as an industrial waste generated during alumina production poses environmental risks and high disposal costs, prompting the utilization of valuable minerals from it. Recovering metallic values from red mud can significantly improve process efficiency, reduce industrial liability, and minimize waste generation, offering potential strategic advantages for resource-deficient nations.
MINERALS ENGINEERING
(2021)
Review
Green & Sustainable Science & Technology
Shaohan Wang, Huixin Jin, Yong Deng, Yuandan Xiao
Summary: In recent years, the environmental issues caused by the accumulation of red mud have become increasingly serious. Research on the comprehensive utilization of red mud is mainly focused on the fields of construction and chemical industry, environmental protection and agriculture, as well as valuable elements extraction industry. The current industrial consumption of red mud in China has been measured, and suggestions for solving the red mud problem have been proposed.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Geochemistry & Geophysics
Axel Denys, Emilie Janots, Anne-Line Auzende, Martine Lanson, Nathaniel Findling, Nicolas Trcera
Summary: Rare earth elements (REE) speciation in laterites can be estimated through sequential extraction procedure (SEP). The evaluation of a 5-step SEP protocol on synthetic Ce-material showed good selectivity of reagents, but the use of hydroxylamine hydrochloride is not recommended due to potential dissolution of certain Ce-minerals.
Article
Chemistry, Multidisciplinary
Eka Putra Ramdhani, Eko Santoso, Holilah Holilah, Reva Edra Nugraha, Hasliza Bahruji, Suprapto Suprapto, Aishah Abdul Jalil, Nurul Asikin-Mijan, Syafsir Akhlus, Didik Prasetyoko
Summary: Conversion of red mud into mesoporous Fe-aluminosilicate can produce selective catalysts for deoxygenation of waste cooking oil. The addition of citric acid during the conversion process changes the structure of the catalyst. Untreated red mud has a well-defined hexagonal mesoporosity, while treated red mud has lower regularity mesopores.
Article
Engineering, Chemical
Hossein Habibi, Mohammad Mokmeli, Sina Shakibania, Dorna Pirouzan, Ziaeddin Pourkarimi
Summary: In this study, a complete process for the recovery of titanium and rare earth elements (REEs) from red mud was developed. The process consists of four main stages: sample preparation, leaching, hydrolysis, and solvent extraction. The proposed process showed high efficiency in the dissolution and concentration of titanium and Sc, with the potential to be considered industrially due to its simplicity, high recovery yield, and utilization of low-cost reagents.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Basudev Swain
Summary: Rare earth metals (REMs) play a critical role in strategic applications such as consumer electronics and clean energy. However, the REM supply chain heavily relies on primary resources, while secondary resources like red mud (RM) containing REMs remain largely unexplored. The current research shows a significant amount of REM oxide in RM, indicating the potential to unlock this resource through efficient technology and research, transforming the supply chain bottleneck into an abundant source.
Article
Green & Sustainable Science & Technology
Muntasir Shahabuddin, Adam C. Powell, Yan Wang
Summary: This study conducts a techno-economic analysis on low-temperature aqueous ER technology to evaluate its value in producing high-quality iron powder from red mud while reducing its causticity.
JOURNAL OF SUSTAINABLE METALLURGY
(2022)
Article
Environmental Sciences
Shuai Ding, Tiantian Zhang, Beibei Fan, Bingqian Fan, Junhui Yin, Shuo Chen, Shuai Zhang, Qing Chen
Summary: Globally, red mud is a waste product of the aluminum industry with high iron oxide content. It is used as a soil amendment in agriculture to prevent phosphorus loss into waters. However, management practices like flooding, drying, and organic carbon inputs can potentially affect phosphorus fixation and release it into waters.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Pablo Leon Higueras, Raimundo Jimenez-Ballesta, Jose Maria Esbri, Rosario Garcia-Gimenez, Eva Maria Garcia-Noguero, Rodrigo Alvarez, Jesus Daniel Peco, Carolina Garcia-Noguero, Juan Antonio Campos
Summary: Monazite is a rare and strategic mineral that is not frequently found in mineable ore deposits. This study assessed the occurrence and risks associated with concentrations of monazite in Mediterranean red soil and found that it is poor in radioactive elements, concentrated in the top soil layers, and potentially immobilized in other minerals. Further research is needed to better understand the speciation of Rare Earth Elements in soils.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Toshimi Nakajima, Mao Kuragano, Makoto Yamada, Ryo Sugimoto
Summary: This study compared the contribution of submarine groundwater discharge (SGD) to river nutrient budgets at nearshore and embayment scales, and found that SGD-derived nutrients become more important at larger spatial scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Fan Liu, Lei Zhang, Chongyang Zhang, Ziguang Chen, Jingguang Li
Summary: NO2 emissions from wall-mounted gas stoves used for household heating have become a significant source of indoor pollution in Chinese urban areas. The high indoor concentration of NO2 poses potential health risks to residents. It is urgently necessary to establish relevant regulations and implement emission reduction technologies to reduce NO2 emissions from wall-mounted gas stoves.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Letter
Environmental Sciences
Hans Peter H. Arp, Raoul Wolf, Sarah E. Hale, Sivani Baskaran, Juliane Gluege, Martin Scheringer, Xenia Trier, Ian T. Cousins, Harrie Timmer, Roberta Hofman-Caris, Anna Lennquist, Andre D. Bannink, Gerard J. Stroomberg, Rosa M. A. Sjerps, Rosa Montes, Rosario Rodil, Jose Benito Quintana, Daniel Zahn, Herve Gallard, Tobias Mohr, Ivo Schliebner, Michael Neumann
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Surya Gupta, Pasquale Borrelli, Panos Panagos, Christine Alewell
Summary: The objective of this study is to incorporate soil hydraulic properties into the erodibility factor (K) of USLE-type models. By modifying and improving the existing equations for soil texture and permeability, the study successfully included information on saturated hydraulic conductivity (Ksat) into the calculation of K factor. Using the Random Forest machine learning algorithm, two independent K factor maps with different spatial resolutions were generated. The results show that the decrease in K factor values has a positive impact on the modeling of soil erosion rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jesmin Akter, Wendy J. M. Smith, Yawen Liu, Ilho Kim, Stuart L. Simpson, Phong Thai, Asja Korajkic, Warish Ahmed
Summary: The choice of workflow in wastewater surveillance has a significant impact on SARS-CoV-2 concentrations, while having minimal effects on HF183 and no effect on HAdV 40/41 concentrations. Certain components in the workflow can be interchangeable, but factors such as buffer type, chloroform, and homogenization speed can affect the recovery of viruses and bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yu Luo, Xueting Yang, Diwei Wang, Hongmei Xu, Hongai Zhang, Shasha Huang, Qiyuan Wang, Ningning Zhang, Junji Cao, Zhenxing Shen
Summary: Atmospheric PM2.5, which can generate reactive oxygen species (ROS), is associated with cardiorespiratory morbidity and mortality. The study found that both the mass concentration of PM2.5 and the DTT activity were higher during the heating season than during the nonheating season. Combustion sources were the primary contributors to DTT activity during the heating season, while secondary formation dominated during the nonheating season. The study also revealed that biomass burning had the highest inherent oxidation potential among all sources investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Erin L. Murphy, Leah R. Gerber, Chelsea M. Rochman, Beth Polidoro
Summary: Plastic pollution has devastating consequences for marine organisms. This study uses a trait-based framework to develop a vulnerability index for marine mammals, seabirds, and sea turtles in Hawai'i. The index ranks 63 study species based on their vulnerability to macroplastic pollution, providing valuable information for species monitoring and management priorities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Kenji Maurice, Amelia Bourceret, Sami Youssef, Stephane Boivin, Liam Laurent-Webb, Coraline Damasio, Hassan Boukcim, Marc-Andre Selosse, Marc Ducousso
Summary: Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Little is known about microbial community resistance and adaptation to disturbances, hindering our understanding of recovery latency and implications for ecosystem functioning. This study found that anthropic disturbance and natural disturbance have different effects on the topology and stability of soil microbial networks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yunhao Li, Yali Feng, Haoran Li, Yisong Yao, Chenglong Xu, Jinrong Ju, Ruiyu Ma, Haoyu Wang, Shiwei Jiang
Summary: Deep-sea mining poses a serious threat to marine ecosystems and human health by disturbing sediment and transmitting metal ions through the food chain. This study developed a new regenerative adsorption material, OMN@SA, which effectively removes metal ions. The adsorption mechanism and performance of the material for metal ion fixation were investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Antonio Medici, Margherita Lavorgna, Marina Isidori, Chiara Russo, Elena Orlo, Giovanni Luongo, Giovanni Di Fabio, Armando Zarrelli
Summary: Valsartan, a widely used antihypertensive drug, has been detected in high concentrations in surface waters due to its unchanged excretion and incomplete degradation in wastewater treatment plants. This study investigated the degradation of valsartan and identified 14 degradation byproducts. The acute and chronic toxicity of these byproducts were evaluated in key organisms in the freshwater trophic chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jiang Lin, Lianbao Chi, Qing Yuan, Busu Li, Mingbao Feng
Summary: This study investigated the photodegradation behavior and product formation of two representative pharmaceuticals in simulated estuary water. The study found that the formed transformation products of these pharmaceuticals have potential toxicity on marine organisms, including oxidative stress and damage to cellular components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hua Fang, Dongdong Jiang, Ye He, Siyi Wu, Yuehong Li, Ziqi Zhang, Haoting Chen, Zixin Zheng, Yan Sun, Wenxiang Wang
Summary: This study revealed that exposure to lower levels of air pollutants led to decreased pregnancy rates, with PM10, NO2, SO2, and CO emerging as the four most prominent pollutants. Individuals aged 35 and above exhibited heightened susceptibility to pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ali Shaan Manzoor Ghumman, Rashid Shamsuddin, Amin Abbasi, Mohaira Ahmad, Yoshiaki Yoshida, Abdul Sami, Hamad Almohamadi
Summary: In this study, inverse vulcanized polysulfides (IVP) were synthesized by reacting molten sulfur with 4-vinyl benzyl chloride, and then functionalized using N-methyl D-glucamine (NMDG). The functionalized IVP showed a high mercury adsorption capacity and a machine learning model was developed to predict the amount of mercury removed. Furthermore, the functionalized IVP can be regenerated and reused, providing a sustainable and cost-effective adsorbent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Rita Bonfiglio, Renata Sisto, Stefano Casciardi, Valeria Palumbo, Maria Paola Scioli, Erica Giacobbi, Francesca Servadei, Gerry Melino, Alessandro Mauriello, Manuel Scimeca
Summary: This study investigated the presence of aluminum in human colon cancer samples and its potential association with biological processes involved in cancer progression. Aluminum was found in tumor areas of 24% of patients and was associated with epithelial to mesenchymal transition (EMT) and cell death. Additional analyses revealed higher tumor mutational burden and mutations in genes related to EMT and apoptosis in aluminum-positive colon cancers. Understanding the molecular mechanisms of aluminum toxicity may improve strategies for the management of colon cancer patients.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)