Article
Chemistry, Physical
Amir Eskanlou, Qingqing Huang, Yann Foucaud, Michael Badawi, Aldo H. Romero
Summary: The flotation of fluorapatite is influenced by dissolved lattice metal ions, particularly Al3+ and Mg2+, impacting the adsorption of collector molecules on its surface and influencing selectivity. A multiscale approach involving various techniques has been developed to better understand these interactions. Fatty acid exhibits a stronger interaction with the bare apatite surface compared to hydroxamates, with both Al3+ and Mg2+ ions beneficial for its adsorption. In the presence of Al3+, a stronger collector-apatite interaction is observed for octanohydroxamic acid, while Mg2+ leads to an improved interaction for both fatty acid and hydroxamates.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Peace P. Mkhonto, Xingrong Zhang, Liang Lu, Yangge Zhu, Long Han, Phuti E. Ngoepe
Summary: Using first-principle quantum mechanical density functional theory, the study explored the adsorption behavior and electronic properties of oxycarbonyl-thiocarbamate collectors with chalcopyrite surfaces. The results indicated that BBCTC and BECTC are better collectors for the selective flotation of chalcopyrite minerals, with a straight hydrocarbon chain exhibiting stronger adsorption than a branched hydrocarbon chain.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yuxi Lu, Kangjing Wu, Shuai Wang, Zhanfang Cao, Xin Ma, Hong Zhong
Summary: A series of N-hydroxy-N-aryl amide collectors were designed and employed for the first time in malachite flotation, with NHNBB showing optimal collection ability and selectivity for malachite. The collectors achieved effective separation of malachite from calcite and quartz by possibly interacting with the malachite surface via chemisorption. This study provides insights into the efficient collection capacity for malachite by N-hydroxy-N-aryl amide collectors.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Metallurgy & Metallurgical Engineering
George Blankson Abaka-Wood, Jonas Addai-Mensah, William Skinner
Summary: The study characterized tailings from a copper processing plant and found that they are rich in rare earth elements, with over 90% recovery achieved through froth flotation. With systematic optimization studies, further enhancement of rare earth element recovery and upgrade efficiency is possible.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Article
Engineering, Chemical
Lingyun Fei, Xin Ma, Hongyu Sun, Shuai Wang, Zhanfang Cao, Hong Zhong, Lanqing Deng
Summary: A novel Y structure multi-functional surfactant, DHBA, was developed for the flotation recovery of rhodochrosite. It exhibited excellent collecting ability and selectivity for rhodochrosite, and improved the surface hydrophobicity of rhodochrosite.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Mei Li, Zhilong Liu, Bin Wang, Xin Teng, Hao Jiang
Summary: In this study, the flotation separation performance and mechanism of fluorite and calcite using a mixed anionic/cationic collector and salted water glass were investigated. The results showed that the mixed collectors had strong selectivity for the two minerals, while the salted water glass selectively inhibited the flotation of calcite. Analysis revealed that the mixed collectors had greater molecular activity and a synergistic effect compared to a single collector. This research provides insights into the separation of fluorite and calcite.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Runpeng Liao, Shuming Wen, Jian Liu, Shaojun Bai, Qicheng Feng
Summary: The escalating demand for zinc resources has positioned zinc oxide ore as a valuable supplementary resource for zinc supply. The study found that the use of the DDA-OHA combined collector significantly improved the recovery of smithsonite, and the chemical and physical adsorption of DDA and OHA were further verified.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Chemistry, Physical
Xiaoyu Cao, Xiaoping Huang, Jianxian Zeng, Rui Zhang, Hong Zhong, Zhanfang Cao
Summary: The role of the thioether (C-S-C) group in improving the flotation performance of benzo-hydroxamic acid (BHA) toward galena was studied. It was found that the incorporation of C-S-C group increased the functional groups, chelating ability and hydrophobicity of BHA, enhancing its flotation performance to galena. The adsorption mechanism analysis showed that the BTHA molecule anchored on the galena surface mainly through the reactions of the two O atoms originated from -C(=O)-NH-OH group and lead species forming a five-membered ring. The C-S-C group in BTHA molecule could donate its electrons to lead species on galena surface, facilitating the adsorption of BTHA.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Mingxia Liu, Hong Yu, Hanquan Zhang, Kaipeng Wang, Xiaoli Tan, Qi Liu
Summary: A controlled study was conducted to investigate the effects of different types of collectors on the flotation ability of niobium oxide minerals with various particle sizes. The study found that hydroxamate-based collectors outperformed carboxylate-based collectors in floating both coarse and fine pyrochlore, indicating the importance of a strong affinity hydrophilic group for effective fine particle flotation. Furthermore, the study revealed that the longer hydrocarbon chain of the collector benefited the flotation recovery of relatively coarse particles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Geochemistry & Geophysics
Bowen Li, Wei Sun, Zhiyong Gao, Renji Zheng, Jian Cao
Summary: This study investigated the effectiveness of thiourea and its derivatives as flotation collectors for separating galena from sphalerite. It was found that these collectors exhibited good selectivity in batch flotation experiments with a single mineral. 1,1-diphenylthiourea (11DTA) was identified as the best choice, with a recovery difference of around 38% between galena and sphalerite at pH 8.
Article
Mining & Mineral Processing
Liping Luo, Houqin Wu, Longhua Xu, Jinping Meng, Jiahui Lu, Huan Zhou, Xiaomei Huo, Lingyun Huang
Summary: This study investigated the enhanced flotation separation performance of ilmenite and titanaugite using a mixed collector BHA/DDA, finding successful separation at a specific molar ratio. Experimental results indicated that in the mixed collector system, BHA adsorbed on mineral surfaces through chemical adsorption, while DDA adsorbed through electrostatic adsorption, forming a stable complex on the ilmenite surface but an unstable one on the titanaugite surface.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yan Wang, Donghui Wang, Longhua Xu, Kai Xue, Xi Zhang, Xinzhang Shi, Chang Liu, Jinping Meng
Summary: A novel oleate hydroxamic acid (OLHA) was synthesized and used as a collector for bastnaesite flotation. The results showed that OLHA achieved efficient separation of bastnaesite and barite under specific conditions.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
A. Geneyton, L. O. Filippov, T. Heinig, N. Buaron, N. -E. Menad
Summary: The exploitation of massive rare-earth element (REE) deposits is often criticized for the pollution generated by heavy mining and extractive metallurgy operations. In an attempt to reduce environmental impact, mine wastes and metallurgy tailings are being considered as alternative sources, but the presence of monazite complicates efficient recovery. This study explores the use of LaCl3 as an activator to improve monazite flotation performance, highlighting the importance of dosage and method of addition for optimal results.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Cai Zeng, Kaihua Huang, Chengke Wang, Yutao Gong, Na Huang, Xiaoping Huang, Huifang Yang, Song Zou, Hong Zhong
Summary: In this study, octyl hydroxamic acid (OHA) was used as a collector for galena flotation, and its adsorption kinetics on galena surface was fully investigated. The optimal pH for adsorption was found to be 9.5, and adsorption equilibrium was reached within 2 hours. It was observed that the adsorption process was exothermic, spontaneous, ordered, and monolayer. The adsorption of OHA on galena surface altered the surface charges and enhanced the hydrophobicity, as confirmed by zeta potential and contact angle measurements, respectively. XPS analysis revealed that OHA primarily chemisorbed on the galena surface through binding reactions between the two oxygen atoms of the -C(=O)-NHOH group and Pb(OH)+ ions at pH 9.5. Flotation experiments demonstrated that 4 x 10-5 mol/L OHA collected 98.62% of galena at pH 9.5, which was higher than the efficiency achieved by sodium isopropyl xanthate (SIPX) under the same experimental conditions.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Yongchao Miao, Shuming Wen, Qi Zuo, Zhihao Shen, Qian Zhang, Qicheng Feng
Summary: A binary collector system containing sodium oleate/salicylhydroxamic acid (NaOL/SHA) was optimized to improve the floatability of cassiterite at low concentrations. The microflotation experiments demonstrated that the NaOL:SHA (1:2) mixture performed better than the single collector, with a flotation recovery of cassiterite above 90% at a pH of 8.0 and a total collector concentration of 5 x 10-5 mol/L. The synergism between NaOL and SHA was explained through various measurements and calculations, indicating strong O-Sn chemical bonds formed on the cassiterite surface.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Qi-Wen Chen, Ze-Qing Guo, Jian-Ping Zhou
Summary: Multifunctional continuous solid solutions NFMTO-x were successfully synthesized via a one-step hydrothermal method by controlling the ratio of Mg and Fe. The NFMTO-x materials exhibited enhanced visible light response, effective adsorption and photocatalytic degradation of organic pollutants, CO2 methanation capability, and easy recyclability due to their magnetic properties. This research provides a significant multifunctional material for water purification.
APPLIED SURFACE SCIENCE
(2024)
Review
Chemistry, Physical
George E. Stan, Maziar Montazerian, Adam Shearer, Bryan W. Stuart, Francesco Baino, John C. Mauro, Jose M. F. Ferreira
Summary: Bioactive glasses have the ability to form strong bonds with tissues and release therapeutic ions. However, their biomechanical compatibility limits their use in load-bearing applications. The use of magnetron sputtering technology to fabricate BG coatings shows promise in improving their efficacy and potential for application.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zhaoxuan Wang, Zhicheng Yan, Zhigang Qi, Yu Feng, Qi Chen, Ziqi Song, Meng Huang, Peng Jia, Ki Buem Kim, Weimin Wang
Summary: The corrosion behavior of Fe-60 and Fe-83 ribbons in 0.6 M NaCl was studied. Fe-60 exhibited a local corrosion mode and formed a stable passivation film with higher corrosion resistance, while Fe-83 showed a combination of local and global corrosion modes and had lower corrosion resistance. Controlling the precipitation of nanocrystalline phases and increasing the POx content in the passivation film significantly improved the corrosion resistance of Fe-based glassy alloys.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hao-Kai Peng, Sheng-Yen Zheng, Wei-Ning Kao, Ting-Chieh Lai, Kai-Sheun Lee, Yung- Hsien Wu
Summary: This study investigates the effects of high energy/fluence proton radiation on the performance of HfZrOx-based FeFETs memory with different Zr content. The results show that the characteristics of FeFETs are influenced by proton radiation, and the extent of the influence depends on the Zr content. FeFETs with 50% Zr content exhibit minimal changes in memory window and demonstrate good endurance and retention performance.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zongyi Yue, Guangyi Wang, Zengguang Huang, Sihua Zhong
Summary: In this study, AZO and ITO films were successfully tuned as excellent passivation layers for c-Si surfaces, achieving effective minority carrier lifetime and outstanding optical properties through the optimization of annealing temperature and interfacial silicon oxide.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Martin Hruska, Jan Kejzlar, Jaroslav Otta, Premysl Fitl, Michal Novotny, Jakub Cizek, Oksana Melikhova, Matej Micusik, Peter Machata, Martin Vrnata
Summary: This paper presents a detailed study on the hydrogen sensing capabilities of highly nanoporous black gold films. The films exhibit fast response and recovery times at low temperatures. Different levels of nanoporosity were prepared and tested to investigate the sensing properties, and it was found that nanoporous black gold is suitable for hydrogen sensing. The sensitivity of the film depends on its nanoporosity.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yupu Wang, Gaofeng Teng, Chun To Yiu, Junyi Zhu
Summary: In the study of BM-SCO and HSCO thin films, it was found that H vacancies tend to prefer sites near the external surface or oxygen vacancy channels (OVCs), while H interstitials prefer sites of oxygen on a layer that contains six-fold coordinated Co. These findings not only enrich the understanding of complex surface phenomena of defect formation but also provide an explanation for the reversibility during phase transformation.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jiafeng Lu, Linping Teng, Qinxiao Zhai, Chunhua Wang, Matthieu Lancry, Ye Dai, Xianglong Zeng
Summary: In this study, we achieved full control of fiber nanograting orientation by manipulating laser polarization, and tailored space variant fiber nanogratings, which expanded the diversity in fiber nanograting engineering.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yibo Liu, Yujie Tao, Yue Liu, Qi Sun, Qinrong Lin, Kexin Kang, Qinghua Zhang, Qingjie Sun
Summary: This study investigates the wettability of the Ti-Cu-Fe multi-metal system, specifically the wetting behaviors of CuSi3 droplets on TC4 and 304SS plates. The results show that the CO2 + Ar gas atmosphere significantly affects interfacial mass transfer, thus influencing the wettability of the systems.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jimei Liu, Fei Wang, Rong Guo, Yuqi Liu, Mengyu Zhang, Jaka Sunarso, Dong Liu
Summary: This study developed Co/MXene composites with anti-corrosion properties by varying the cobalt content. These composites exhibited remarkable electromagnetic absorption performance and high resistance to corrosion under various corrosive conditions. The study also revealed the mechanism of electron transfer from cobalt to MXene and the electromagnetic dissipation behavior originated from polarization loss alone.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Moujie Huang, Yongsong Ma, Jingbo Yang, Lingyun Xu, Hangqi Yang, Miao Wang, Xin Ma, Xin Xia, Junhao Yang, Deli Wang, Chuang Peng
Summary: Strong metal-support interactions (SMSIs) are important for enhancing catalytic activities and stability in thermal catalysis. This study demonstrates a method to create SMSIs in electrocatalysis using carbon nanotubes and Ru nanoparticles, resulting in excellent catalytic activity and stability.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Ravi Trivedi, Brinti Mondal, Nandini Garg, Brahmananda Chakraborty
Summary: This study explores the potential of biphenylene as a nanocarrier for the delivery of the anticancer drug cisplatin. It is found that biphenylene offers physical stability, rapid release rate, solubility, and bio-compatibilities compared to other nanocarriers. The adsorption of cisplatin on the surface of biphenylene involves charge transfer from cisplatin to biphenylene. The drug is shown to be released at body temperature in an acidic environment. Biphenylene also exhibits excellent cytotoxicity activity and cellular uptake of the drug. Overall, biphenylene shows promise as a potential nanocarrier for cisplatin delivery.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yasir Abbas, Shafqat Ali, Sajjad Ali, Waqar Azeem, Zareen Zuhra, Haoliang Wang, Mohamed Bououdina, Zhenzhong Sun
Summary: In this study, FeOx@SPNO-C core-shell nanospheres as a catalyst for degradation of sulfamethoxazole (SMX) were successfully synthesized. The synergistic interaction between FeOx and SPNO-C, high carbon charge density, and the presence of C = O groups and N/Fe-Nx sites were found to be key factors for the enhanced degradation of SMX.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Qiaoting Yang, Yuxiao Gong, Yan Qian, Zhou-Qing Xiao, Serge Cosnier, Xue-Ji Zhang, Robert S. Marks, Dan Shan
Summary: This study proposes a hierarchical confinement strategy to design Prussian blue nanoparticles (PB NPs) with satisfactory electrocatalytic ability and stability. The catalytic synthesis of PB NPs is achieved through a hydrothermal process, and the as-prepared PB@NH2MIL exhibits efficient electronic transmission and enhanced electrocatalytic properties.
APPLIED SURFACE SCIENCE
(2024)