COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Weiguang Zhou,Weiwei Cao,Kanghao Zheng,Lei Zhang,Shulan Shi,Yaoli Peng
Salicylhydroxamic acid (SHA) and octyl hydroxamic acid (OHA) are two commonly used hydroxamic acid-based collectors in fine cassiterite flotation . While some reports suggest that a mixture of OHA and SHA yields superior results compared to their individual use, there is a lack of experimental exploration and theoretical analysis. In this study, the flotation performance and the associated adsorption mechanism of SHA, OHA and their mixture on fine cassiterite particles was systematically investigated. The results demonstrate a synergistic effect between SHA and OHA in enhancing fine cassiterite flotation, with the most significant enhancement occurring at a 1:1 mass ratio under the natural pH conditions. This finding is corroborated by contact angle and zeta potential tests. When both SHA and OHA are present, SHA likely attaches to the cassiterite surface via chemisorption in the form of a five-membered chelate ring, while OHA adheres through physical adsorption , primarily establishing hydrogen bonds with oxygen sites on the cassiterite surface or with SHA molecules. The adsorption ratio of SHA to OHA onto cassiterite surfaces is approximately 69%: 31% when an equal mass of SHA and OHA interact with cassiterite under the natural pH condition.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 8
·
IF 2.504
Liuyi Ren,Hang Qiu,Wenqing Qin,Ming Zhang,Yubiao Li,Penggang Wei
The existence of metal ions should not be ignored in both hydrometallurgy and flotation. In this study, the effects of Ca2+, Mg2+ and Fe3+ on the flotation performance of cassiterite using octanohydroxamic acid (OHA) as the collector were investigated by micro-flotation tests, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, contact angle, zeta (ζ) potential measurements and atomic force microscopy (AFM) imaging. The results of the flotation and contact angle experiments showed that the addition of Ca2+, Mg2+ and Fe3+ significantly decreased both the recovery and contact angle of cassiterite with pH ranged from 6.0 to 12.0 in the presence of OHA collector. ζ-Potential measurements, solution chemistry analysis and FTIR measurements indicated that the flotation recovery of the cassiterite declined due to the CaOH+, MgOH+ and Fe(OH)3 sites on the cassiterite surface. XPS results indicated that the chemisorption of OHA and calcium ions on the cassiterite surface finally changed its chemical properties. The AFM images also revealed that new species Fe(OH)3 of Fe3+ formed and adsorbed on the cassiterite surface at pH 9.0. The adsorption of Fe(OH)3 reduced the adsorption of OHA on the cassiterite surface, thus the hydrophobicity of cassiterite was deteriorated.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 9
·1905
·
IF 3.426
Xiaoyan Cao,Qing Wang,Shuai Wang,Ruilin Man
In this study, a novel polystyrene-poly(hydroxamic acid) copolymer was synthesized as an effective adsorbent for the treatment of rare earth elements. Through the use of elemental analysis as well as FTIR, SEM, XPS, and Brunauer-Emmett-Teller (BET) surface area measurement, the synthesized polymer was found to have a specific surface area of 111.4 m2·g−1. The adsorption performances of rare metal ions were investigated under different pH levels, contact times, initial concentrations of rare earth ions, and temperatures. The adsorption equilibrium for La3+, Ce3+, and Y3+onto a polystyrene-poly(hydroxamic acid) copolymer is described by the Langmuir model, which confirms the applicability of monolayer coverage of rare earth ions onto a polystyrene-poly(hydroxamic acid) copolymer. The amount of adsorption capacities for La3+, Ce3+, and Y3+reached 1.27, 1.53, and 1.83 mmol·g−1within four hours, respectively. The adsorption process was controlled by liquid film diffusion, particle diffusion, and chemical reaction simultaneously. The thermodynamic parameters, including the change of Gibbs free energy (∆G), the change of enthalpy (∆H), and the change of entropy (∆S), were determined. The results indicate that the adsorption of resins for La3+, Ce3+and Y3+was spontaneous and endothermic. The polymer was also used as a recyclable adsorbent by the desorption experiment.Keywords:adsorption;hydroxamic acid resin;rare earth ions;separation;synthesis
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Xin Wu,Zili Yang,Chunlin Song,Mengwei Bu,Weiguo Li,Jiang Duan,Guang-Fu Yang,Aidong Zhang
Fosmidomycin (FOS) is a natural product inhibiting the DXR enzyme in the MEP pathway and has stimulated interest for finding more suitable FOS analogues. Herein, two series of FOS analogue hydroxamate-containing bisphosphonates as proherbicides were designed, with bisphosphonate replacing the phosphonic unit in FOS while retaining the hydroxamate (BPF series) or replacing it with retro-hydroxamate (BPRF series). The BPF series were synthesized through a three-step reaction sequence including Michael addition of vinylidenebisphosphonate, N-acylation, and deprotection, and the BPRF series were synthesized with a retro-Claisen condensation incorporated into the reaction sequence. Evaluation on model plants demonstrated several compounds having considerable herbicidal activities, and in particular, compound 8m exhibited multifold activity enhancement as compared to the control FOS. The proherbicide properties were comparatively validated. Furthermore, DXR enzyme assay, dimethylallyl pyrophosphate rescue, and molecular docking verified 8m to be a promising proherbicide candidate targeting the DXR enzyme. In addition, 8m also displayed good antimalarial activities.
研究领域:
植物学
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药理学
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农业科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jing Qi,Jichang Tu,Xian Xie,Hongling Wang,Ruiqi Xie
In view of the combination of dodecylamine and hydroxamate can improve the flotation recovery of spodumene, a novel β -amino-hydroxamate surfactant, i.e., N -(3-(dodecylamino)) hydroxamic acid (DAHA), was designed and introduced into spodumene flotation. The micro-flotation performance indicated that DAHA performed excellent collecting ability toward spodumene, and 2.0 × 10 -4 mol/L of DAHA floated out about 90.2% of spodumene, while that of sodium oleate (NaOL) was only about 57.4%. The zeta potential of DAHA-treated spodumene revealed the effective chemisorption of hydroxamate group on spodumene surface. FTIR and XPS recommended that the hydroxamate group in DAHA chelated with surface Al sites to form five-membered hydroxamate-(O,O)-Al complexes. The affinity of DAHA on spodumene spontaneously enhanced by the protonated amino group (–NH 3 + ), which facilitated the chelation of hydroxamate with the surface Al atoms and strengthened the hydrophobicity of spodumene.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2023
·Vol. 69
·期 5
·e18023
·
IF 3.7
Qing Sun,Yan Dong,Shuai Wang,Zhanfang Cao,Xin Ma,Hong Zhong
Modified surfactants can regulate their adsorption at the target surface and are essential for various separation applications such as froth flotation. Thioether-containing hydroxamic acid (BTHA) is an excellent oxidized-ore collector with poor dispersibility. Herein, acylamino, which possesses the ability to improve the surfactants' self-assembly and dispersion, was introduced to synthesize N-[6-(hydroxyamino)-6-oxohexyl] benzylthioacetamide (BTAHA); thus, applying it to cassiterite flotation. Surface tension, adsorption capacity, in situ AFM, and surface energy results reveal BTAHA displays strong bubble stability and readily adsorbs onto the mineral's surface, promoting hydrophobic flotation. BTAHA is an effective cassiterite collector and has good separation effects on cassiterite against calcite. It can form Van der Waals forces and five-membered hydroxamate-(O,O)-Sn rings with Sn atoms on cassiterite surfaces via thioether and hydroxamate groups. Meanwhile, the presence of intermolecular hydrogen bond between the amide groups facilitates the self-assembly of the collectors on the cassiterite surface, and has broad industrial application prospects in various separation processes.
研究领域:
矿物加工工程
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界面化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 9
·3911
·
IF 4.6
Saizhen Jin,Qing Shi,Leming Ou
This work investigated the hydrophobic flocculation of cassiterite using four alkyl hydroxamic acids with varying carbon chain lengths, i.e., hexyl hydroxamate (C6), octyl hydroxamate (C8), decyl hydroxamate (C10) and dodecyl hydroxamate (C12), as collectors. Microflotation tests were performed to investigate the flotation behaviour of cassiterite in the presence of the four alkyl hydroxamic acids. Focused beam reflectance measurement (FBRM) and a particle video microscope (PVM) were used to analyse and monitor the real-time evolution of the particle size distribution of cassiterite and the images of flocs during flocculation. The extended DLVO theory interaction energies between the cassiterite particles were calculated on the basis of the measured contact angle and the zeta potential of cassiterite to determine the aggregation and dispersion behaviour of the cassiterite particles. The microflotation test results suggested that the floatability of cassiterite improved with the increase in the carbon chain length of hydroxamates. FBRM, PVM images and extended DLVO theory calculation results indicated that when C6was used as the collector, the cassiterite particles could not form hydrophobic flocs because the total potential energy between them was repulsive. When C8, C10and C12were used as collectors, the energy barrier amongst particles decreased with increasing hydroxamate concentration. The lowest concentrations of C8, C10and C12that could cause the hydrophobic aggregation of cassiterite were approximately 1 × 10−3, 1 × 10−4and 2 × 10−5mol/L, respectively. The aggregation growth rate and apparent floc size increased with an increasing collector concentration. Hydroxamic acid with a longer carbon chain could induce the cassiterite particles to form larger flocs at a lower concentration in a shorter time.Keywords:fine cassiterite;alkyl hydroxamates;hydrophobic flocculation;carbon chain length
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Gilsang Hong,Hyojeong Nam,Levie Mweene,Hyunjung Kim
Flotation of goethite, a representative mineral of laterite ore, which is essential source of nickel used in secondary batteries, was conducted using salicylhydroxamic acid as the collector. The presence of ferric ions derived from goethite in the pulp resulted in an increased consumption of the collector during flotation. Following three washing stages, the maximum recovery of 98.5 wt% was achieved with a collector dosage of only 60 % in the absence of a washing stage. The oxalic acid is employed to eliminate ferric ions via precipitation without the requirement for supplementary water, energy, and time-consuming washing stages. The utilization of 40 g⋅t −1 of oxalic acid yielded comparable recovery outcomes to those observed in the three washing stages. Furthermore, theoretical investigations were conducted to determine the collector species influencing goethite flotation with density functional theory. It was observed that compared with that of goethite with non-ionized salicylhydroxamic acid complex, the complexation energy for goethite with ionized salicylhydroxamic acid was lower by 113.9 kJ⋅mol −1 , indicating that the optimum adsorption onto the mineral surface strongly depends on ionized salicylhydroxamic acid species. This study presents a potential method for reduction of reagent consumption in the flotation of future complex laterite ore, an acidic soil in which metal ions might be present. Additionally, the theoretical framework elucidates the complexation of collectors to minerals that are challenging to quantify experimentally.
研究领域:
矿物加工工程
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Zheyu Huang,Jingzhong Kuang,Luping Zhu,Weiquan Yuan,Zhilei Zou
The effect of ultrasound on the solution properties and microstructure of benzohydroxamic acid (BHA) were investigated to separate scheelite from calcite effectively in this study. The influence of ultrasound-treated BHA on flotation kinetics, surface properties and the adsorption heat of reagents and minerals was discussed. The results show that the difference in the flotation rate between scheelite and calcite was significantly increased by ultrasound-treated BHA. The grade and recovery rate of tungsten concentrate were increased and the flotation time was reduced, which resulted in the rapid separation of scheelite and calcite. Ultrasonic effects significantly increased the adsorption amount, adsorption rate and contact on the surface of scheelite with BHA, which have no noticeable effects on the surface of calcite. The adsorption heat of the interaction between BHA and scheelite was significantly increased by ultrasound due to the increase in the adsorption rate of scheelite on BHA. The ultrasonic effect promotes the dissociation of BHA in solution and the formation of a fine droplet structure, reduces the surface tension, resulting the decrease in the adhesion work and induction time between BHA and scheelite.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Minerals
·
2020
·Vol. 10
·期 3
·282
·
IF 2.38
Wenliang Xiong,Jie Deng,Kaile Zhao,Weiqing Wang,Yanhong Wang,Dezhou Wei
The flotation of bastnaesite, as a major mineral source of rare earth elements, attracting much attention in the mineral processing field, is challenging owing to the natural flotability of calcium-bearing minerals. To promote the application of flotation, we systematically investigated the flotation behavior of bastnaesite, barite, and calcite, with salicylhydroxamic acid (SHA) as the collector through micro-flotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses, and solution chemistry analyses. Micro-flotation experiments confirm that the flotability of bastnaesite is high at pH 6.5–8.5, while calcite floats at pH 8.0–9.5, and barite has little flotation response. The results of FT-IR, XPS, and zeta-potential measurements indicate that there is chemical adsorption of SHA on the bastnaesite surface, and physical adsorption also occurs. However, as for barite and calcite, there is only physical adsorption of SHA on the surfaces. The solution chemistry results show that SHA anions can interact with RE3+, REOH2+, and RE(OH)2+on bastnaesite surfaces in aqueous suspensions, resulting in bastnaesite flotation.Keywords:bastnaesite;barite;calcite;salicylhydroxamic acid;flotation
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Liuyi Ren,Hang Qiu,Ming Zhang,Kaiyue Feng,Peng Liu,Jing Guo,Jian Feng
The effects of lead ions on the flotation performance of the cassiterite system have been investigated using microflotation tests. Adsorption experiments, X-ray photoelectron spectroscopy (XPS), contact angle measurement, and zeta (ζ)-potential measurements were conducted. Octanohydroxamic acid and lead ion solution speciation simulations were used. These were used to correlate surface properties of lead-activated with cassiterite flotation performance. Flotation results indicate that the addition of lead ions activates the cassiterite flotation. The addition of lead ions enhanced the adsorption of octanohydroxamic acid on cassiterite, and the wetting characteristic of cassiterite decreased in the presence of octanohydroxamic acid and the addition of lead ions. ζ-Potential measurements and solution chemistry analyses confirmed that flotation recovery of the cassiterite increases due to Pb(OH)+ and Pb3(OH)42+ sites on the cassiterite surface. XPS results indicated the adsorption of octanohydroxamic acid onto the cassiterite surface was through chemisorption, which combined with lead ions changed the chemical properties of the cassiterite surface.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 4
·665-677
·
IF 5.6
Mweene Levie,Hong Gilsang,Jeong Hee-Eun,Kang Hee-won,Kim Hyunjung
Comparative experiments and theoretical analysis of the surface chemistry changes of goethite (GT) and goethite containing Ni (GTN) in the lattice in the presence of salicylhydroxamic acid (SA) were performed. It was revealed that in the presence of 100 g·t −1 of SA, the flotation recovery of GTN and GT increased with increasing pH, achieving a maximum recovery of 98.9% for both minerals at pH 8.3 and decreasing beyond that pH, with GTN having a slightly higher recovery than GT, except at pH 8.3. This was further confirmed by the higher complexation energies of GTN⋯SA (−883.87 kJ·mol −1 ) compared with GT⋯SA (−604.23 kJ·mol −1 ) resulting from covalent, closed-shell, and conventional hydrogen bonding. The higher adsorption of SA onto GTN relative to GT was due to the formation of a π-hole in GTN, thereby promoting a higher interaction of the collector with the mineral. Thus, the presence of Ni in the GT lattice improves and decreases the adsorption and desorption of SA onto and from the mineral, respectively, compared with those onto and from GT.
研究领域:
矿物学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）