Article
Chemistry, Multidisciplinary
Chang Liu, Bingqiao Yang, Feifei Jia, Shaoxian Song
Summary: In this study, a MoS2@activated alumina bead composite was used as a catalyst to recover gold from thiosulfate leaching solution. The recovery efficiency reached 98%, much higher than traditional methods, and the reduced gold could be desorbed from the composite using a supersonic method, achieving one-step gold recovery.
Article
Chemistry, Multidisciplinary
Weiquan Zhan, Yuan Yuan, Xin Yao, Bingqiao Yang, Feifei Jia, Changsheng Lin, Jose Luis Arauz-Lara, Shaoxian Song
Summary: Mn-doped molybdenum disulfide spheres were successfully prepared via a facile hydrothermal route for the photocatalytic reduction of gold(I) thiosulfate complex. The efficient recycling of [Au(S2O3)(2)](3-) in the form of gold nanoparticles by Mn-MoS2 was achieved, with enhanced reduction capacity and rate compared to MoS2. The promising strategy offered by this study could lead to more efficient extraction of gold(I) from thiosulfate leaching solutions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Peng Chen, Pablo Rafael Brito-Parada, Shaoxian Song, Feifei Jia
Summary: The photocatalytic activity of semiconductors can be enhanced by surface decoration of precious metal particles. In this study, a MoS2-based Ohmic contact was fabricated by depositing Ag nanoparticles on MoS2 nanosheets, which improved the photoreduction of Au(I) from a low concentration Au(S2O3)23- solution. Efficient interface charge transfer and higher electron concentration on the surface of Ag/MoS2 NSs resulted in a significantly higher gold recovery rate compared to pristine MoS2 NSs.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zhujuan Li, Shuliang Chen, Futing Zi, Xianzhi Hu, Yunlong Chen
Summary: A fast and efficient adsorption method for recovering Au(I) from an actual leaching solution of Cu2+-en-S2O32- was developed using aminophosphonic acid derivatized polyacrylonitrile fibers (PANNP) as the adsorbent. The adsorbent was characterized and the effects of various parameters on the adsorption process were investigated. The results showed that PAN-NP could rapidly capture Au(S2O3)23- within 20 minutes and had a maximum adsorption capacity of 14.68 kg/t. The adsorption mechanism involved anion exchange, electrostatic attraction, and complexation. The PAN-NP-Au complex could be effectively eluted with sodium sulfite, achieving a high adsorption percentage of up to 97%.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Thiago R. S. Malagrino, Anna P. Godoy, Juliano M. Barbosa, Abner G. T. Lima, Nei C. O. Sousa, Jairo J. Pedrotti, Pamela S. Garcia, Roberto M. Paniago, Lidia M. Andrade, Sergio H. Domingues, Wellington M. Silva, Helio Ribeiro, Jaime Taha-Tijerina
Summary: In this study, flower-like molybdenum disulfide (MoS2) microspheres were successfully synthesized with polyethylene glycol (PEG) to form MoS2-PEG. Gold nanoparticles (AuNPs) were incorporated to form hierarchical MoS2-PEG/Au microstructures, showing good cellular viability on both tumoral and non-tumoral cells. The hybrid nanomaterials demonstrated potential for cancer diagnosis and therapy with their multifunctional characteristics.
Article
Chemistry, Analytical
Jun Jiang Luo, Ling Yun Qin, Xiao Juan Du, Hong Qun Luo, Nian Bing Li, Bang Lin Li
Summary: Semiconducting MoS2 layers act as substrates for the growth of gold nanostructures, with Au atoms reducing conjugated Au(i) to form Au-covering MoS2 heterostructures. The surface engineering of MoS2 involving Hg2+ ions leads to differential growths of nanostructures and morphological diversities, resulting in naked-eye colorimetric responses to mercury ions with a low detection limit of 1.27 nM.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Multidisciplinary
Chao Wang, Zicheng Wang, Jian Xu, Yanhe Nie
Summary: The study showed that Cu/Fe-LDHs prepared CLDH had the best adsorption capacity for Au(S2O3)(2)(3-), reaching 48.6 mg/g. The pseudo-second-order kinetic model was found to be more suitable for describing the adsorption of Au(S2O3)(2)(3-) by Cu/Fe-CLDH. The adsorption isotherm fitting experiment indicated that the adsorption of Au(S2O3)(2)(3-) by Cu/Fe-CLDH conformed to the Langmuir model.
Article
Chemistry, Physical
Dexuan Li, Guoshen Zeng, Yaoyao Wu, Zhenyu Zhou, Wei Guo, Chuanhao Li
Summary: Co-catalysts engineering, especially the non-noble traditional metal dichalcogenides, shows great potential in promoting photocatalytic water splitting for hydrogen gas production. In this study, a novel Au induced 1T-MoS2 modified S-doped-g-C3N4 photocatalyst was constructed, which exhibited significantly enhanced photocatalytic hydrogen evolution rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Foad Ghasemi, Morteza Hassanpour Amiri
Summary: A novel rGO/MoS2/Au NPs heterostructure has been introduced, which efficiently converts light into electricity and demonstrates about 240% improvement in photocurrent density compared to a GO/MoS2 hybrid. This improvement is attributed to the efficient transfer of electrons to Au NPs and a significant reduction in the recombination rate of photogenerated carriers.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Abniel Machin, Loraine Soto-Vazquez, Diego Garcia, Maria C. Cotto, Dayna Ortiz, Pedro J. Berrios-Rolon, Kenneth Fontanez, Edgard Resto, Carmen Morant, Florian Petrescu, Francisco Marquez
Summary: This study investigated the photocatalytic performance of different zinc oxide catalysts containing gold nanoparticles (AuNPs), molybdenum disulfide (MoS2), and reduced graphene oxide (rGO) for the degradation of levofloxacin (LFX) and ciprofloxacin (CFX) antibiotics in water. The study found that LFX was more resistant to degradation than CFX, and the main degradation pathway under visible light is the generation of hydroxyl radicals. Photoluminescence (PL) measurements confirmed the inhibitory effect of electron-hole recombination when AuNPs, MoS2, and rGO were integrated into the semiconductor. The catalyst with the highest percentage of CFX degradation was 1%Au@ZnONPs-3%MoS2-1%rGO, achieving a degradation efficiency of 96%, while the catalyst with the highest percentage of LFX degradation was 5%Au@ZnONPs-3%MoS2-1%rGO, exhibiting a degradation efficiency of 99.8%. Gas chromatography-mass spectrometry (GC-MS) analysis identified reaction intermediates and potential degradation pathways for both antibiotics. Recyclability assessments demonstrated that the synthesized catalysts maintained stable photocatalytic efficiencies after 15 cycles, indicating their potential for further usage and testing with other organic contaminants.
Article
Chemistry, Multidisciplinary
Jing Li, Shuang Wang, Qi Jiang, Haoji Qian, Shike Hu, He Kang, Chen Chen, Xiaoyi Zhan, Aobo Yu, Sunwen Zhao, Yanhui Zhang, Zhiying Chen, Yanping Sui, Shan Qiao, Guanghui Yu, Songang Peng, Zhi Jin, Xinyu Liu
Summary: This study successfully achieved the epitaxial growth of single crystal MoS2 (SC-MoS2) monolayer on an Au (111) film, allowing for the unidirectional alignment of MoS2 domains with seamless stitching into a single crystal monolayer without GBs formation. This breakthrough in growth mode provides a new direction for the practical applications of TMDCs in microelectronics.
Article
Engineering, Electrical & Electronic
Md Tawabur Rahman, Raufur Rahman Khan, Yang Tian, Hussam Ibrahim, Liang Dong
Summary: This study demonstrates the room-temperature detection of N2O gas using 2D molybdenum disulfide nanoflakes decorated with gold nanoparticles. The combination of the electron-donating effect of AuNPs and the properties of MoS2 enables high sensitivity and excellent selectivity, with the ability to detect N2O levels as low as 0.5 ppm.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Chemical
Yan Zhang, Bin Xu, Yunquan Zheng, Qian Li, Yongbin Yang, Xiaoliang Liu, Tao Jiang, Xianjun Lyu
Summary: Hexaamminecobalt(III) is an efficient catalyst for gold thiosulfate leaching, surpassing Co(II) and Cu(II), enabling more efficient gold recovery through resin adsorption. This catalyst shows promise in replacing Cu(II) for gold extraction and recovery from ores.
MINERALS ENGINEERING
(2021)
Review
Metallurgy & Metallurgical Engineering
Feng Xie, Jun-nan Chen, Jian Wang, Wei Wang
Summary: Thiosulfate is considered the most promising alternative to cyanide for gold leaching, with characteristics such as non-toxicity, low cost, and high leaching rate. Challenges and problems still exist in this system despite extensive research, leading to studies using nickel, cobalt, and iron-based catalysts to reduce thiosulfate consumption.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Chemistry, Multidisciplinary
Sara Rodriguez-da-Silva, Abdel Ghafour El-Hachimi, Jose M. Lopez-de-Luzuriaga, Maria Rodriguez-Castillo, Miguel Monge
Summary: MoS2 nanoflowers were used as a substrate for the deposition of AuAg or Au nanoparticles, resulting in photothermal-assisted catalysts with different nanostructures. The catalytic reduction of 4-nitrophenol to 4-aminophenol was evaluated. The hydrothermal synthesis of MoS2 nanoflowers provided a material with broad absorption in the Vis-NIR region. Alloyed AuAg and Au nanoparticles were grafted onto MoS2 nanoflowers, leading to nanohybrids with photothermal properties. The AuAg-MoS2 nanohybrid showed better catalytic activity than the Au-MoS2 nanohybrid.
Article
Metallurgy & Metallurgical Engineering
Arsyad Maulana Dzulqornain, Ana Belen Cueva-Sola, Kyeong Woo Chung, Jin-Young Lee, Rajesh Kumar Jyothi
Summary: This study presents a hydrometallurgical process for the separation of light rare earth elements (LREEs) using oxidation, precipitation, solvent extraction, and stripping techniques. Selective oxidation with potassium permanganate was employed for the separation of cerium (III). Solvent extraction with Cyanex 572 and cross-current scrubbing were used to achieve the separation of lanthanum (III) from neodymium (III) and praseodymium (III).
Article
Metallurgy & Metallurgical Engineering
Bo Chen, Shenxu Bao, Yimin Zhang
Summary: This study investigated the effects of Al, Fe, P, Si and Na on the precipitation characteristics of vanadium in the ultrasound precipitation system. The concentration upper limits and the negative influence on the precipitation kinetics were determined for each impurity. The findings provide theoretical and technical support for the industrial application of ultrasound precipitation technology.
Article
Metallurgy & Metallurgical Engineering
Chunlin He, Mingwei Qi, Yun Liu, Zunzhang Liu, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, Wenchao Yang, Junyuan Gan
Summary: In this study, D201 x 7 resin and tartaric acid were used as materials and complexing agents for the separation of germanium from sulfuric acid solution. The study successfully achieved the separation of germanium and demonstrated the high selectivity and adsorption performance of the resin.
Article
Metallurgy & Metallurgical Engineering
Xiaobo Zhu, Yue Liu, Chen Ma, Wang Li
Summary: A selective and highly effective method for the extraction and separation of V(IV) and Fe(III) using N235 and P507 as solvent extractants is proposed. The pH, composition, and concentration of the extractant mixture have significant effects on the extraction efficiency and separation factor. The mixing of P507 and N235 generates the P507 monomer, which enhances the extraction efficiency and weakens the stability of vanadium containing extraction complex. Cation exchange process forms the extraction complexes.
Article
Metallurgy & Metallurgical Engineering
B. Behnajady, J. Yousefi Seyf, S. Karimi, M. Moradi, M. Sohrabi
Summary: Deep eutectic solvents (DES) have potential as environmentally-friendly solvents for recovering metals from spent lithium-ion batteries (LIBs). Experimental and molecular dynamics simulation results showed that the chloride ions in DES can form complexes with lithium, manganese, and nickel ions, facilitating their extraction.
Review
Metallurgy & Metallurgical Engineering
Sebastian Kinas, Dorota Jermakowicz-Bartkowiak, Anna Dzimitrowicz, Piotr Cyganowski
Summary: The high demand for platinum-group metals (PGMs) and Re in economical and industrial applications related to environmental protection and energy conversion/storage has led to resource scarcity. Thus, it is crucial to recover and recycle these rare metals. This study critically reviews the recent progress in the effective recovery of PGMs and Re from materials relevant to sustainable technologies, emphasizing practical aspects, environmental impact, and issues related to the unit processes of recovery.
Article
Metallurgy & Metallurgical Engineering
Guopeng Yang, Qinggang Li, Guiqing Zhang, Mingyu Wang, Zuoying Cao, Wenjuan Guan, Jiawei Du, Shengxi Wu
Summary: The study proposes an efficient, clean, and economical process for recovering V2O5 from titanium-white waste through hydrogen peroxide stripping and precipitation of vanadium products by heating. Experimental results show that the use of D2EHPA as a modifier prolongs the duration of maximum stripping efficiency, enabling continuous operation.
Article
Metallurgy & Metallurgical Engineering
Guisu Yu, Shuainan Ni, Yun Gao, Ditang Mo, Zhiyuan Zeng, Xiaoqi Sun
Summary: This research proposes a novel green process for the selective recovery of rare earth elements (RE) from spent NdFeB permanent magnet using hydrophobic deep eutectic solvent (HDES). Through optimization of extraction conditions and stripping method, efficient and clean separation and recovery have been achieved.
Article
Metallurgy & Metallurgical Engineering
Jia Li, Xinsheng Wu, Xiaozhou Zhou, Li Zeng, Shengxi Wu, Mingyu Wang, Wenjuan Guan, Zuoying Cao, Qinggang Li, Guiqing Zhang
Summary: This paper presents a complete hydrometallurgical route for the full-component utilization of deep-sea polymetallic nodules (DPN), achieving high recovery efficiency and near-zero waste production with low energy consumption.
Article
Metallurgy & Metallurgical Engineering
Sanae Elmisaoui, Abderrazak M. Latifi, Lhachmi Khamar
Summary: A first principles model is developed to describe the dissolution mechanism of phosphate ore particles in a solution of phosphoric acid. The model accounts for non-uniform size of ore particles using particle size distributions and quantifies their influence on the model predictions. A global estimability analysis is carried out to determine the estimable parameters from experimental data, and the predictions show good agreement with the experimental data. The computed activation energy indicates that diffusion is the rate limiting step of the dissolution process.
