Article
Geochemistry & Geophysics
Sanghee Jeon, Sharrydon Bright, Ilhwan Park, Akuru Kuze, Mayumi Ito, Naoki Hiroyoshi
Summary: This study investigates the enhanced cementation technique using aluminum and activated carbon to recover gold ions from ammonium thiosulfate solution. The results show that the recovery rate is influenced by factors such as initial concentration, size/amount, temperature, and shaking speed.
Article
Metallurgy & Metallurgical Engineering
Sanghee Jeon, Sharrydon Bright, Ilhwan Park, Carlito Baltazar Tabelin, Mayumi Ito, Naoki Hiroyoshi
Summary: The study presents an efficient method for recovering Au(I) ions from thiosulfate medium based on the galvanic interactions between aluminum (Al) and activated carbon (AC). The results showed that the Al-AC mixture can achieve over 99% Au recovery. Activated carbon (AC) plays a critical role as a reduction mediator in Au recovery, facilitating electron transfer between Al and Au ions. Scanning electron microscopy and electrochemical experiments confirmed the mechanism of Au recovery by Al-AC in thiosulfate medium.
Article
Environmental Sciences
Jialin Liang, Xiaojian Liao, Maoyou Ye, Zhijie Guan, Zhihua Mo, Xian Yang, Shaosong Huang, Shuiyu Sun
Summary: The study compared the activation of peroxymonosulfate (PMS) by zero-valent iron (Fe-0) and zero-valent aluminum (Al-0) for waste activated sludge (WAS) conditioning. Fe-0/PMS treatment showed superior dewaterability of WAS and reduced operational costs compared to Al-0/PMS treatment. The study proposes a novel perspective for selecting an optimal PMS activator in sludge treatment to alleviate environmental risks.
Article
Engineering, Chemical
Yanhe Nie, Sen Wang, Qiang Wang, Jianghao Chen, Yunxiang Jiang
Summary: By applying an electrode potential, the consumption of metal and zinc powder can be reduced, and the gold leaching rate can be improved, achieving the recovery and reuse of gold thiosulfate leaching solution.
MINERALS ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Ruining Cai, Wanying He, Jing Zhang, Rui Liu, Ziyu Yin, Xin Zhang, Chaomin Sun
Summary: Research has shown that light exists in various deep-sea environments. A study unexpectedly found that blue light is necessary for a bacterium, Erythrobacter flavus 21-3, to produce excess zero-valent sulfur (ZVS) in a deep-sea cold seep. This deep-sea blue light provides E. flavus 21-3 with a selective advantage in the cold seep, suggesting an unappreciated relationship between light-sensing pathways and sulfur metabolism in deep-sea microorganisms.
Article
Environmental Sciences
Katie M. Wagner, Tasios Karathanasis, Christopher J. Matocha
Summary: Elevated nitrate concentrations can negatively impact the environment and human health. Recent studies have examined the use of zero-valent iron to treat nitrate-contaminated groundwater and investigated the kinetics and mechanism of nitrate reduction. The study revealed that nitrate reduction by zero-valent iron is diffusion controlled under anoxic conditions and slower under oxic conditions.
Article
Chemistry, Physical
Shenghui Xie, Jiaxin Su, Jianxin Zhao, Haipeng Yang, Haixia Qian
Summary: This study investigates the improved catalytic activity of Fe3O4-decorated glassy zero-valent iron (GZVI) through a low-cost ball milling technique. The addition of 10% Fe3O4 to GZVI resulted in the best surface morphology and highest catalytic efficiency. The Fe3O4/GZVI catalyst exhibited excellent stability and reusability, achieving a 97.37% degradation of p-nitrophenol within 15 minutes. The formation of a galvanic cell between Fe3O4 and GZVI played a crucial role in promoting electron transfer and hydroxyl radical generation, thereby enhancing the pollutant degradation process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Ge Gao, Lei Zhang, Yixin Shi, Shengjiong Yang, Gen Wang, Huining Xu, Dahu Ding, Rongzhi Chen, Pengkang Jin, Xiaochang C. Wang
Summary: The study found that the microscopic galvanic cell (mGC) exhibited higher Fe(II) release performance compared to ordinary nanoscale-ZVI (nZVI), resulting in improved Cr(VI) removal efficiency. Density functional theory (DFT) revealed that the close proximity of cathode and anode in mGC enhanced the galvanic corrosion of Fe(0). Additionally, hydroxyl radicals generated by a series of side-reactions slightly hindered the reduction of Cr(VI) in the system.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Microbiology
Ruining Cai, Wanying He, Rui Liu, Jing Zhang, Xin Zhang, Chaomin Sun
Summary: This study confirmed the formation of zero-valent sulfur (ZVS) by the deep-sea bacterium Erythrobacter flavus 21-3 using the thiosulfate oxidation pathway determined by TsdA and SoxB. It revealed the importance of this pathway in the sulfur cycle of cold seeps and provided an in situ approach to study the metabolism of deep-sea microorganisms.
Article
Chemistry, Multidisciplinary
Qingqing Zhang, Dingwen Shi, Mengqin Guo, Hao Zhao, Yanbing Zhao, Xiangliang Yang
Summary: Pyroptosis of tumor cells was induced by biGC@PNA with a precisely stoichiometric ratio of Au(I) ion/Au(0) atom through its radiofrequency (RF)-heating effect. The activated pyroptosis resulted in a robust immunogenic cell death (ICD) effect, enhancing the antitumor immune responses and suppressing tumor metastasis and relapse. The noninvasive RF field provides a promising strategy for improving cancer immunotherapy.
Article
Chemistry, Physical
Yin Wang, Yishu Gong, Naipeng Lin, Lan Yu, Baobao Du, Xiaodong Zhang
Summary: The study found that the MMT-nFe(0)/Cu-0 nanocomposite can effectively remove Cr(VI) pollutants, exhibiting good dispersibility and reduction activity, and preventing the release of metal ions. This composite material not only has advantages in reaction rate, but also has good environmental friendliness.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Takunda Joseph Mhandu, Ilhwan Park, Sanghee Jeon, Sohta Hamatsu, Yogarajah Elakneswaran, Mayumi Ito, Naoki Hiroyoshi
Summary: A new method to improve gold extraction from sulfide-bearing gold ores is proposed in this study. The presence of sulfide minerals on the surface of gold powder hindered gold extraction due to the unwanted decomposition of thiosulfate. By pretreating the sulfide-bearing gold ores with ammonium solutions containing cupric ions, thiosulfate consumption was minimized, resulting in a significant improvement in gold extraction from 10% to 79%.
Article
Engineering, Chemical
Xianke Sun, Yanxin Qin, Wen Zhou
Summary: This paper studied the degradation of amoxicillin by ultrasound-zero valent iron activated sodium persulfate and optimized the best degradation conditions. The research found that ultrasonic power, sulfate concentration, and zero-valent iron dosage have significant impacts on the removal efficiency of amoxicillin.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Joshua Zoleta, Sanghee Jeon, Akuru Kuze, Nako Okada, Ilhwan Park, Mayumi Ito, Yogarajah Elakneswaran, Naoki Hiroyoshi
Summary: Ammonium thiosulfate leaching is a promising alternative method for extracting gold, and this study investigated the recovery of gold using iron oxides. The results showed that iron oxides had selective gold recovery compared to activated carbon.
Article
Environmental Sciences
Ran Yang, Jun Cai, Hu Yang
Summary: In this study, ZVAl was utilized as a reductant to activate molecular oxygen and generate reactive oxygen species for the degradation of organic compounds in wastewater. The efficiency of ZVAl composites with different clay minerals was found to be strongly influenced by the presence of Fe in the clay, leading to improved oxidation performance. However, the levels of improved oxidation performance were not directly correlated with the total Fe content in the clays, suggesting that other physical and chemical properties of the clays also play a role in the degradation efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Manis Kumar Jha, Pankaj Kumar Choubey, Om Shankar Dinkar, Rekha Panda, Rajesh Kumar Jyothi, Kyoungkeun Yoo, Ilhwan Park
Summary: A feasible hydrometallurgical process for the recovery of rare earth metals (REMs) and valuable metals from spent NiMH batteries has been developed. The process involves dissolution of REMs using sulfuric acid, selective extraction of REMs using PC88A, and selective precipitation of La. The developed process shows potential for industrial exploitation.
Article
Geochemistry & Geophysics
Sanghee Jeon, Sharrydon Bright, Ilhwan Park, Akuru Kuze, Mayumi Ito, Naoki Hiroyoshi
Summary: This study investigates the enhanced cementation technique using aluminum and activated carbon to recover gold ions from ammonium thiosulfate solution. The results show that the recovery rate is influenced by factors such as initial concentration, size/amount, temperature, and shaking speed.
Article
Green & Sustainable Science & Technology
Elham Aghaei, Bogale Tadesse, Carlito Baltazar Tabelin, Richard Diaz Alorro
Summary: The Fe-Al bimetallic material has shown great potential in eliminating mercury pollution from gold processing wastewaters, with a high removal efficiency achieved under varying conditions. The removal mechanism involves a redox reaction and adsorption by Fe oxy-hydroxides.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Delia B. Senoro, Kevin Lawrence M. de Jesus, Ronnel C. Nolos, Ma Rowela L. Lamac, Khainah M. Deseo, Carlito B. Tabelin
Summary: The domestic water quality of an island province in the Philippines that experienced two major mining disasters in the 1990s was assessed. The results showed that the water sources were heavily polluted, with significant health risks associated with arsenic and lead.
Editorial Material
Geochemistry & Geophysics
Ilhwan Park, Marthias Silwamba
Article
Energy & Fuels
Theerayut Phengsaart, Ilhwan Park, Jirathpapol Pasithbhattarabhorn, Palot Srichonphaisarn, Chinawich Kertbundit, Nutthakarn Phumkokrux, Onchanok Juntarasakul, Carlito Baltazar Tabelin, Naoki Hiroyoshi, Mayumi Ito
Summary: In this study, a microencapsulation-hybrid jig separation technique was developed to improve the separation efficiency of pyrite and coal. The hybrid jig combines jig separation and flotation to stratify particles based on their specific gravity. Microencapsulation was used to render pyrite hydrophilic and enhance its separation from hydrophobic coal. Results showed that the hybrid jig required less separation time and reduced the effects of particle size on separation efficiency. However, the separation efficiency of the hybrid jig was lower than that of the conventional jig due to bubble attachment to both pyrite and coal. The microencapsulation-hybrid jig separation technique significantly improved the separation of coal and pyrite by limiting bubble attachment and has the potential to reduce acid mine drainage formation.
Article
Geochemistry & Geophysics
Einstine M. Opiso, Carlito Baltazar Tabelin, Christian V. Maestre, John Paul J. Aseniero, Takahiko Arima, Mylah Villacorte-Tabelin
Summary: The repurposing of gold mine tailings through alkali activation technology has potential for waste reduction in developing countries. Palm oil fuel ash was used as an admixture to synthesize a geopolymer composite from ASGM tailings, improving its strength and ability to immobilize toxic elements.
Article
Engineering, Chemical
Ilhwan Park, Mayumi Ito, Sanghee Jeon, Carlito Baltazar Tabelin, Theerayut Phengsaart, Marthias Silwamba, Naoki Hiroyoshi
Summary: Aluminum is an important non-ferrous metal in modern society, but its production from primary ores is energy intensive and generates large amounts of CO2 and solid waste. Recycled aluminum scrap, on the other hand, offers economic and environmental benefits due to lower energy consumption and less solid waste generation. This study investigates the surface modification of aluminum alloys by iron deposition for magnetic separation, which has shown promising results for sequential recovery of different aluminum alloys.
MINERALS ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Theerayut Phengsaart, Pongsiri Julapong, Chaiwat Manositchaikul, Palot Srichonphaisarn, Monthicha Rawangphai, Onchanok Juntarasakul, Kosei Aikawa, Sanghee Jeon, Ilhwan Park, Carlito Baltazar Tabelin, Mayumi Ito
Summary: This article systematically reviews recent studies (2012-2021) on the separation of PVC from other types of plastics. The majority of the works focus on flotation, while more advanced technologies have been introduced in recent years.
Article
Materials Science, Multidisciplinary
Joshua Zoleta, Sanghee Jeon, Akuru Kuze, Nako Okada, Ilhwan Park, Mayumi Ito, Yogarajah Elakneswaran, Naoki Hiroyoshi
Summary: Ammonium thiosulfate leaching is a promising alternative method for extracting gold, and this study investigated the recovery of gold using iron oxides. The results showed that iron oxides had selective gold recovery compared to activated carbon.
Article
Materials Science, Multidisciplinary
Takunda Joseph Mhandu, Ilhwan Park, Sanghee Jeon, Sohta Hamatsu, Yogarajah Elakneswaran, Mayumi Ito, Naoki Hiroyoshi
Summary: A new method to improve gold extraction from sulfide-bearing gold ores is proposed in this study. The presence of sulfide minerals on the surface of gold powder hindered gold extraction due to the unwanted decomposition of thiosulfate. By pretreating the sulfide-bearing gold ores with ammonium solutions containing cupric ions, thiosulfate consumption was minimized, resulting in a significant improvement in gold extraction from 10% to 79%.
Article
Geochemistry & Geophysics
Junnile L. Romero, Carlito Baltazar Tabelin, Ilhwan Park, Richard D. Alorro, Joshua B. Zoleta, Leaniel C. Silva, Takahiko Arima, Toshifumi Igarashi, Takunda Mhandu, Mayumi Ito, Steffen Happel, Naoki Hiroyoshi, Vannie Joy T. Resabal
Summary: Rare earth elements are crucial for green energy applications, but their extraction faces sustainability challenges due to the concentrated global supply. This study investigates a modified extraction chromatographic resin as a promising adsorbent for REE recovery, providing a potential solution for sustainable supply diversification.
Article
Geochemistry & Geophysics
Muhammad Bilal, Ilhwan Park, Mayumi Ito, Fawad Ul Hassan, Kosei Aikawa, Sanghee Jeon, Naoki Hiroyoshi
Summary: Carrier flotation is a technique that uses coarse carrier particles to recover fine particles during the flotation process. By using Cu2+-treated pyrite particles as carriers, the recovery of fine chalcopyrite particles can be improved. However, a post-flotation separation process is required to improve the grade of the final Cu concentrate.
Review
Chemistry, Multidisciplinary
Pongsiri Julapong, Apisit Numprasanthai, Ladda Tangwattananukul, Onchanok Juntarasakul, Palot Srichonphaisarn, Kosei Aikawa, Ilhwan Park, Mayumi Ito, Carlito Baltazar Tabelin, Theerayut Phengsaart
Summary: Rare earth minerals containing rare earth elements are crucial for modern technologies due to their distinctive properties. However, these minerals are non-renewable and unevenly distributed, making the recycling of REEs from secondary resources essential for long-term sustainability.
APPLIED SCIENCES-BASEL
(2023)
Article
Social Sciences, Interdisciplinary
Dennis Alonzo, Carlito Baltazar Tabelin, Irish Mae Dalona, Arnel Beltran, Aileen Orbecido, Mylah Villacorte-Tabelin, Vannie Joy Resabal, Michael Angelo Promentilla, Pablo Brito-Parada, Yves Plancherel, Anne D. Jungblut, Robin Armstrong, Ana Santos, Paul F. Schofield, Richard Herrington
Summary: The rehabilitation of legacy mines is challenging due to difficulties in ensuring their safety and productivity, as well as lack of participation from the local community. To address these issues, the Bio + Mine project focuses on rehabilitating the abandoned Sto. Nino copper mine in the Philippines, using a social-ecological-technological system framework. The project aims to develop an inclusive mitigation strategy based on local knowledge and practices, which can be a model for other mines worldwide.
INTERNATIONAL JOURNAL OF QUALITATIVE METHODS
(2023)
