Article
Engineering, Environmental
C. P. Broeksma, C. Dorfling
Summary: This study investigated the use of glycine as a lixiviant for copper dissolution from waste PCBs, and found that glycine concentration did not significantly affect the rate or extent of copper leaching when oxygen was used as oxidant. Increasing temperature improved copper dissolution, while using air as oxidant decreased the copper dissolution due to lower concentration of dissolved oxygen. Using hydrogen peroxide as oxidant did not improve copper leaching. Finally, leaching with 1 M glycine and oxygen at 60 degrees C was proposed as the most feasible condition.
Article
Chemistry, Multidisciplinary
Abhijit Nag, Carole A. Morrison, Jason B. Love
Summary: A new approach using mixtures of triphenylphosphine dichloride or oxalyl chloride and hydrogen peroxide in organic solvents was developed for the rapid dissolution of elemental noble metals (NMs). Almost complete dissolution of gold, palladium, and copper was observed within minutes at room temperature. This method has potential applications in the hydrometallurgical leaching and purification of NMs from ores, spent catalysts, and electronic and nano-wastes.
Article
Green & Sustainable Science & Technology
Parinaz Rafiee, Sina Ghassa, Farhad Moosakazemi, Rasoul Khosravi, Hossein Siavoshi
Summary: Germanium is a critical and rare element extracted as a byproduct of zinc and copper refining, with high-tech applications in optics and electronics industries. This study investigated germanium extraction from semiconductor diodes using acetic acid as a green reagent, showing over 70% extraction efficiency under specific conditions. Kinetic modeling revealed three phases of germanium dissolution with diffusion control and interfacial transfer as limiting-rate steps.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Kianoush Barani, Morteza Dehghani, M. R. Azadi, Ali Karrech
Summary: The study investigated the leaching of a polymetal gold ore using a synergistic lixiviant mixture of cyanide and glycine. Increasing cyanide concentration from 500 to 1500 ppm resulted in a higher gold dissolution rate. However, using 0.5-1 M/L glycine in 500 ppm cyanide can achieve 90% gold dissolution with increased copper dissolution.。Reducing cyanide consumption by approximately 80% was achieved at the optimal approach, but increasing glycine concentration also led to higher dissolution of other metals like Pb, Zn, Fe, Ag, and Cu.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Physical
Pengwei Li, Shao-hua Luo, Yafeng Wang, Shengxue Yan, Fei Teng, Jian Feng, Qing Wang, Yahui Zhang, Wenning Mu, Xiangle Zhai, Xin Liu
Summary: A process for recycling steelmaking waste and preparing high value-added lithium-ion batteries (LIBs) electrode materials LiFePO4 and Li4Ti5O12 was proposed. The study showed improved purity and performance of the materials synthesized from the waste residue, providing a potential solution to environmental pollution and energy crisis.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Chemical
Lei Hou, Alejandro Lopez Valdivieso, Peng Chen, Guowei Zhang, Qi Zhang, Yu Chen, Shaoxian Song, Feifei Jia
Summary: This study proposes a novel and environmentally friendly glycinethiosulfate system for gold extraction. The anodic dissolution of gold is mainly influenced by copper(II)-glycine complexes as catalysts, with Cu(C2H4NO2)3- complex enhancing the dissolution rate. The excellent catalytic capability of the Cu(C2H4NO2)3- complex is attributed to its lowest corrosion potential, slighter passivation behavior, and rapid electron transfer. Gold dissolution in the novel glycine-thiosulfate system involves a typical ligand exchange process and the formation of passivation species predominantly by Au(I)-glycine coordination rather than sulfur-containing products.
MINERALS ENGINEERING
(2023)
Article
Environmental Sciences
Orevaoghene Eterigho-Ikelegbe, Ryan Trammell, Emmanuel Ricohermoso III, Samson Bada
Summary: A simple process of mixing, pressing, thermal curing, and pyrolysis was used to convert coal waste into high-value composites. The bonding mechanisms between coal particles and preceramic polymers were suggested. The structural properties of the coals affected the reaction during pyrolysis, resulting in varying qualities of composites. The hydrophobic surfaces of the composites indicated that external coating may not be necessary.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Cathrine Eckbo, Gudny Okkenhaug, Sarah E. Hale
Summary: Concrete is a common building material and the increase in its reuse and recycling is important for the shift to a circular economy. The leaching and spread of hexavalent chromium during concrete recycling is a concern. This study investigated the leaching of Cr(VI) from crushed concrete waste and the impact of soil organic matter (SOM) in realistic reuse scenarios. The results showed that exposing recycled concrete waste to SOM can mitigate Cr(VI) leaching.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Francesca Russo, Rosa Veropalumbo, Ludovico Pontoni, Cristina Oreto, Salvatore Antonio Biancardo, Nunzio Viscione, Francesco Pirozzi, Marco Race
Summary: The continuous growth of waste is causing increasing environmental concerns globally, leading to the loss of raw materials and production factors. This research explored the potential of using different waste materials as fillers for hot asphalt mastics, finding that certain waste materials performed better in terms of mechanical and environmental efficiency compared to traditional limestone fillers.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Physical
Andrei Shoppert, Irina Loginova, Julia Napol'skikh, Aleksey Kyrchikov, Leonid Chaikin, Denis Rogozhnikov, Dmitry Valeev
Summary: This study investigates the possibility of selectively extracting cerium from alkali fusion red mud (RMF) using diluted nitric acid as a leaching agent. The results show that under certain conditions, with a leaching solution at pH 2 and 80 degrees Celsius for 90 minutes, the extraction efficiency of cerium reaches 71.2%.
Article
Environmental Sciences
Lingyu Kong, Zhaowen Wang, Zhongning Shi, Xianwei Hu, Aimin Liu, Wenju Tao, Benping Wang, Qian Wang
Summary: Salvaging valuable metals from cathode materials of spent lithium-ion batteries is a promising strategy for green and sustainable development. The use of methanol as a reducing agent for the acid leaching of cathode materials allows efficient extraction of cobalt and lithium. The leaching process is diffusion-controlled, and methanol is transformed into formic acid to enhance leaching.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Shun-xiang Shi, Si-qi Jiang, Chun-chen Nie, Biao Li, Hong-hao Chang, Xiang-nan Zhu
Summary: This study focused on two environmentally friendly copper leaching systems, ammonia-ammonium chloride leaching system and glycine-hydrogen peroxide leaching system, revealing the factors influencing the leaching rate of copper and proposing a simple yet effective leaching kinetics model.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Chemical
Shengbo Qiu, Yue Zhu, Youfa Jiang, Chenglin Liu, Jianguo Yu
Summary: This article proposes a method for lithium extraction from alpha-spodumene by directly destroying its structure in a potassium hydroxide solution, resulting in the generation of solid-phase products of Li2SiO3 and KAlSiO4. Under optimal conditions, the method achieves a high efficiency of lithium extraction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
S. Beste Aydin, Alim Gul
Summary: The production and exploration of gold are increasingly important worldwide, with recycling playing a significant role in the supply and price of gold. After investigating different methods, it was found that flotation is more economical and environmentally friendly for recycling gold and silver from jewellery slag compared to cyanide leaching.
WASTE MANAGEMENT & RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Faris Matalkah
Summary: Medical Waste Bottom Ash (MWBA) is a toxic material that poses serious health risks to the atmosphere and humans. This study investigates methods to enhance the reactivity of MWBA for its use in concrete mixtures. Results show that ball milling (wet or dry) and calcination increase the ash reactivity and compressive strength of mortar, while a combination of wet milling followed by calcination significantly enhances compressive strength. The inclusion of 40% calcined MWBA improves acid resistance in concrete.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Sadia Ilyas, Rajiv Ranjan Srivastava, Hyunjung Kim
Summary: The selective separation of cobalt versus nickel from an HCl leached solution of spent lithium-ion batteries using a green ionic liquid has been developed, achieving a cobalt recovery rate of over 99%.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Environmental
Sadia Ilyas, Rajiv Ranjan Srivastava, Hyunjung Kim
Summary: A cradle-to-cradle recycling process for post-consumer NMC batteries was demonstrated, achieving a focused separation of cobalt over nickel using an ionic liquid. The optimized conditions resulted in over 99% cobalt extraction in the organic phase with a separation factor of 1097. The extracted cobalt was stripped and crystallized to obtain high-purity CoCl2•xH2O crystals. Similarly, around 99% nickel was extracted from the Co-depleted solution using acetophenone, and the stripped nickel was crystallized to yield high-purity NiSO4•6H2O crystals. The recycled products were further used to synthesize a new ternary precursor, showing similar electrochemical behavior and compatibility with precursors made from virgin materials. The overall recycling process was determined to be suitable for sustainable development with a sustainable process index value of 0.0006 cap.t-1.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Allan Gomez-Flores, Scott A. Bradford, Li Cai, Martin Urik, Hyunjung Kim
Summary: In this study, a comprehensive Alpha database was built from experimental data and a machine learning model was developed to predict Alpha. The accuracy of the model was verified through training and validation. The model also evaluated the significance of 22 input variables.
Review
Geochemistry & Geophysics
Rajiv Ranjan Srivastava, Dilip Kumar Rajak, Sadia Ilyas, Hyunjung Kim, Pankaj Pathak
Summary: The incessant generation and mismanagement of industrial waste, resource scarcity, and environmental degradation have led to the unsustainability of human life. Industrial waste, regardless of its hazardous nature, is often open dumped, resulting in adverse environmental and health impacts. However, this waste can be recycled and help alleviate resource scarcity.
Review
Biochemistry & Molecular Biology
Bence Farkas, Hana Vojtkova, Zuzana Farkas, Domenico Pangallo, Peter Kasak, Antonio Lupini, Hyunjung Kim, Martin Urik, Peter Matus
Summary: Manganese oxides are crucial in natural geochemical barriers, as they have reactive properties towards essential and potentially toxic trace elements. Microorganisms can actively alter conditions in their microenvironment and dissolve minerals, as well as precipitate bioavailable manganese ions into biogenic minerals. These microbial transformations significantly impact the geochemistry of manganese and elements associated with its oxides, potentially leading to environmental consequences.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Metallurgy & Metallurgical Engineering
Levie Mweene, Allan Gomez-Flores, Hee-Eun Jeong, Sadia Ilyas, Hyunjung Kim
Summary: Nickel, a strategic element, has seen an increase in production and consumption of over 39% and 71% in the past decade. This article reviews the current methods of extracting nickel from laterites, which are the main source of nickel, and proposes potential future directions. The study finds that using a selective comminution-classification method followed by flocculation-flotation strategy can increase both the recovery and grade of nickel. The findings could be used to improve production and meet demand.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2023)
Editorial Material
Microbiology
Chunqiao Xiao, Chunli Zheng, Yanfei Zhang, Huan He, Sadia Ilyas
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Allan Gomez-Flores, Scott A. Bradford, Gilsang Hong, Hyunjung Kim
Summary: The aggregation attachment efficiency (alpha) is the fraction of particle-particle collisions resulting in aggregation. Despite significant research, alpha predictions have not accounted for the full complexity of systems due to constraints imposed by particle types, dispersed matter, water chemistry, quantification methods, and modeling. Experimental alpha values are often case-specific, and simplified systems are used to rule out complexity. Building a comprehensive alpha database can enable the development of more accurate empirical models for prediction.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Wonhong Song, Sowon Choi, Hyunjung Kim, Sadia Ilyas
Summary: Waste recycling is important due to environmental regulations and the depletion of critical resources. The recycling of lithium from waste saggar is crucial because of the high supply-risk of lithium. In this study, different additives and temperatures were examined for the leaching of lithium from waste saggar, and NaOH was found to be the most efficient for extraction and recovery.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Rajiv Ranjan Srivastava, Sadia Ilyas, Dilip Kumar Rajak, Ji-hye Yang, Hyunjung Kim
Summary: Waste cathode ray tubes (CRT) have the potential to recycle rare earth resources through an efficient recycling process. This study found that removing zinc from a CRT during microwave roasting can affect the mineral phases of rare earths. By adjusting parameters such as acid medium, concentration, temperature, and time, high leaching efficiency can be achieved, leading to the production of high-purity (Y,Eu)2(C2O4)3 salt.
Article
Engineering, Chemical
Mweene Levie, Hyun-Su Park, Seungmin Kang, Hyunjung Kim
Summary: The flotation of quartz and chalcopyrite in the presence of polyethylene oxide was experimentally and theoretically investigated. The study found that the polymer tends to adsorb more onto chalcopyrite in high alkaline environments, and this was confirmed theoretically. The research also revealed the complexation mechanism between chalcopyrite and the polymer, suggesting that polyethylene oxide could be a potential chalcopyrite depressant.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Analytical
Yanan Liu, Genyao Gu, Guoqing Li, Hyunjung Kim, Li Cai, Huiwen Cai
Summary: This study investigated the transport and retention behaviors of polystyrene and poly(lactic-co-glycolic acid) nanoparticles (PS NPs and PLGA NPs) in real groundwaters from three coastal cities in China. The results showed that PS NPs had higher transport rates compared to PLGA NPs in different groundwaters. The pH of the groundwaters was found to be a contributing factor to the transport behavior of the nanoparticles.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
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)
