Membranes
·
2023
·Vol. 13
·期 9
·781
·
IF 4.2
Jiaming Gao,Yongchao Sun,Feifei Kang,Fei Guo,Gaohong He,Hanli Wang,Zhendong Yang,Canghai Ma,Xiaobin Jiang,Wu Xiao
Mixed matrix membranes (MMMs) generally have some fatal defects, such as poor compatibility between the two phases leading to non-selective pores. In this work, PIM-1 was chosen as the polymer matrix, and UiO-66 modified with amidoxime (UiO-66-AO) was used as the filler to prepare the MMMs. In the MMMs, the amino and hydroxyl groups on UO-66-AO form a rich hydrogen bond network with the N and O atoms in the polymer PIM-1 chain to improve the compatibility between the polymer matrix and the filler. In addition, the selective adsorption of CO2by the amidoxime group can promote the transport of CO2in the membrane, which enhances the gas selectivity. The CO2permeability and CO2/N2selectivity of UiO-66-AO@PIM-1 MMMs are increased by 35.2% and 45.2% compared to pure PIM-1 membranes, reaching 7535.5 Barrer and 26.9, surpassing the Robeson Upper Bound (2008) and close to the 2019 Upper Bound. After 38 days of the aging experiment, the CO2permeability is approximately 74% of the original. The results show that the addition of UiO-66-AO has an obvious effect on improving the aging properties of the membrane. The UiO-66-AO@PIM-1 MMMs have a bright prospect for CO2separation in the future.Keywords:amidoxime;UiO-66-AO;mixed matrix membrane;PIM-1;CO2/N2separation
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
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
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Kuixin Cui,Shengming Jin,Nan Duan
The adsorption mechanism of benzohydroxamic acid (BHA) on rhodochrosite surfaces under Pb 2+ activation was systematically studied through a series of experiments. Comparing to the results of only BHA treatment, Pb 2+ ions raised the adsorption amount of BHA and the floatability of rhodochrosite, especially at pH 8.0–9.0. It was proven that Pb(OH) + was deemed as the critical species to adsorb onto rhodochrosite surfaces in the form of lead-containing complexes. Afterwards, rhodochrosite surfaces became much more activated for BHA adsorption. BHA collector reacted with adsorbed-Pb and Mn species of rhodochrosite surfaces, and the charged hydroxamic acid also adsorbed onto rhodochrosite surfaces through electrostatic attraction and co-adsorption. Besides, lead hydroxamate complexes generated in suspension had excellent adhesions on rhodochroganite surfaces. It was apparent that the BHA adsorption was strengthened under the activation of Pb 2+ ions. BHA collector matching with Pb 2+ ions had great potentials to improve the flotation recovery of rhodochrosite.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Keyi Xu,Lihui Gao,Shulei Li,Hongzhao Liu,Yanhong Liu,Wenfeng Pan
The extraction of gallium using amidoxime chelating resin has demonstrated extensive industrial applications. However, repeated desorption cycles lead to resin deactivation, and untreated waste resins may pose environmental risks. This study conducted deactivation diagnosis on waste resin, characterizing its surface morphology and functional group distribution through FSEM, XPS, and FTIR analyses. The deactivated resin exhibited three key characteristics: Surface contamination by impurities, oxidation of amidoxime groups into carboxylic acids and hydroxamic acids, and occupation of Ga(III) adsorption sites by competing ions. To address these issues, a regeneration strategy combining ultrasonic cavitation for impurity removal with amidoximation of residual nitrile groups was proposed. Under the conditions of Ga(III) concentration 200 mg/L, pH 12, and liquid-solid ratio 100 mL/g, the regenerated resin demonstrated an adsorption capacity of 12.21 mg/g, which was 2.71 times that of new resin. The adsorption process of the regenerated resin conforms to the Langmuir isotherm. The theoretical maximum adsorption capacity of Ga(III) was calculated to be 34.78 mg/g under alkaline conditions. XPS analysis confirmed the critical role of oxygen-containing functional groups in Ga(III) adsorption. This research provides novel insights into resource utilization of the waste resin and demonstrates significant potential for Ga(III) extraction applications.
研究领域:
环境科学
·
化学工程
·
材料科学
·
冶金学
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chen Cheng,Guangsheng Zeng,Zhiqiang Huang
3-Ethyl-4-pyridylamidoxime (EPA) and 3-methyl-5- tert -butyl-4-pyridylamidoxime (MBPA) were introduced as the collectors in the flotation and enrichment of malachite from calcite and quartz. Compared with MBPA and the traditional collector benzohydroxamic acid (BHA), EPA exhibited a better flotation performance. Its collecting ability to malachite was stronger than BHA, and its selectivity toward calcite and quartz was better than MBPA. In the absence of Pb 2 + ions, 2.0 × 10 −4 mol/L EPA at pH 8.0 could recover about 86 % malachite, 20 % calcite and 22 % quartz. Under the same conditions, BHA floated out around 58 % malachite, 27 % calcite and 10 % quartz. The contact angle and SEM proved that EPA could enhance the surface hydrophobicity of malachite via corrosion to produce more active sites for its heavy adsorption. FTIR and XPS revealed that EPA would chelate with the surface Cu atom to form -O-Cu and -N-Cu bonds. EPA owned stronger electron-donating ability and worse electron-accepting ability than BHA, which brought a stronger chemical reactivity. Moreover, its isomer could further enhance the adsorption ability onto malachite. The novel amidoxime collector EPA was able to efficiently lead-free enrich malachite and enhance the industrial capacity to treat copper oxide ores.
研究领域:
矿物加工工程
·
化学工程与技术
✓ 已验证
产品关联
DOI
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
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
You Huang,Shufen Zou,Shan Lin,Bing Na,Zhuyao Li,Shuang Zhang
It is still a challenge to synthesize high-performance adsorbents for uranium extraction from seawater. The stable uranyl tricarbonate complex in seawater seems to preclude coordination of uranyl ions by adsorbents. This study reports 3D networked colloidal particles consisting of polyamidoxime (PAO) and sodium polyacrylate (PAA-Na) segments via competitive conversion between amidoximation and hydrolysis in NaOH aqueous solutions. PAA-Na can promote the dissociation of uranyl ions via ion exchange for high-efficiency coordination by PAO. As a result, the colloidal particles, with high selectivity for uranyl ions, reach an outstanding uranium uptake capacity of 17.8 mg U per g in real seawater after 20-day adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Meng Cao,Guangsheng Luo,Qin Peng,Lushuang Wang,Yue Wang,Shilei Zhao,Hui Wang,Jiacheng Zhang,Yihui Yuan,Ning Wang
Effective uranium extraction from seawater can contribute greatly for meeting the needs of low carbon energy. Extensive studies have been conducted on polyamidoxime-based (PAO-based) adsorbents for their exceptional uranium adsorption capabilities. However, the salt-shrinkage effect severely hinders the extraction of uranium from seawater using traditional PAO-based adsorbents. This study synthesizes a novel semi-interpenetrating polymer network hydrogel, designated as PAO/PMPC-SH, using a free-radical polymerization approach utilizing PAO and zwitterionic poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC). The incorporation of the PMPC component endows the adsorbent with exceptional resistance to salt shrinkage owing to the antipolyelectrolyte effect. This characteristic facilitates the diffusion of uranyl ions within PAO/PMPC-SH, even in a high-salt environment with a salt concentration as high as 25 wt%, thereby exposing the uranium binding sites in the adsorbent. Moreover, PAO/PMPC-SH exhibits exceptional antibacterial activity. After 28 days of test in natural seawater, PAO/PMPC-SH demonstrates a high uranium extraction capacity of 6.26 mg g −1 , representing only a 9.14 % decrease compared with the capacity of adsorbing in marine microorganism-removed natural seawater. Overall, the notable performance of PAO/PMPC-SH in uranium extraction highlights its potential as a highly effective adsorbent for uranium extraction from seawater.
研究领域:
材料科学
·
环境科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lingzhi Zhou,Xian Xie,Xiong Tong,Jing Qi,Ruiqi Xie,Jichang Tu
This study introduced α-Benzoin oxime (BO) as a novel and efficient collector for the selective flotation of ilmenite from diopside. Micro-flotation experiments demonstrated that BO exhibits superior collection performance compared to benzohydroxamic acid (BHA) under weakly acidic to neutral conditions. At pH 8 and a BO dosage of 5× 10 -4 mol/L, flotation tests on ilmenite-diopside mixed minerals achieved a TiO 2 recovery of 89.90 % with a TiO 2 grade of 47.84 %. Contact angle measurements revealed that BO adsorption notably enhances the hydrophobicity of ilmenite surfaces. Zeta potential and FTIR analyses confirmed the selective adsorption of BO onto ilmenite. Furthermore, XPS and TOF-SIMS results indicated that coordination bonds formed between the C–O and C=N–OH groups in BO and Fe(II) ions on the ilmenite surface may facilitate BO adsorption. These findings provide valuable insights into the interaction mechanism between BO and ilmenite, highlighting its potential as an efficient collector for ilmenite flotation.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 6
·635
·
IF 2.8
Fan Cao,Shumei Yao,Xiaowen Meng,Jianpeng Wang,Sujie Chang,Yi Wang,Aiqing Song,Dayong Li,Lei Shi
The novel pyridine oxime-based complexing agents 2-pyridinecarboxaldehyde oxime, 2-acetylpyridine ketoxime and 2-pyridine amidoxime were synthesized for alkaline Zn-Ni alloy electrodeposition, outperforming conventional citrate/TEPA systems in corrosion resistance and microstructural control. The N,O-bidentate chelation mechanism governs metal ion reduction kinetics via diffusion-limited pathways, enabling γ-phase Ni5Zn21intermetallic formation and nanocrystalline refinement. Electrochemical and microstructural analyses demonstrate suppressed random nucleation and hydrogen evolution side reactions, leading to enhanced charge transfer resistance and reduced corrosion current density. Notably, 2-pyridine amidoxime achieves ultrasmooth surfaces through defect-free nanocluster growth, while 2-pyridinecarboxaldehyde oxime maximizes γ-phase crystallinity. The synergy between grain boundary density and surface integrity establishes a dual protection mechanism combining barrier layer formation and active dissolution suppression. This work advances microstructure engineering via coordination chemistry, offering a breakthrough over traditional zincate electroplating for high-performance anti-corrosion coatings.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 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
·
表面化学
✓ 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
危险品化学品经营许可证（带存储）