MINERALS ENGINEERING
·
2025
·
IF 5
Xusheng Yang,Bo Feng,Ziming Wang,Longxia Jiang,Jefferson Bayoundoula
In this study, pectin was used as an environmentally friendly depressant to study its flotation behavior and aggregation effect on key magnesium silicate gangue minerals commonly found in nickel ore, such as talc, chlorite, and serpentine. The interaction mechanisms between pectin and minerals were explored using a series of techniques, including IC-FBRM particle size analysis, adsorption tests, scanning electron microscopy (SEM) tests, FTIR analysis, XPS analysis, and zeta potential measurements. Results from flotation experiments, IC-FBRM tests, and SEM observations indicate that under natural conditions, serpentine tends to aggregate with talc, but the three mixed minerals still exhibit floatability. At low dosages of pectin, serpentine and chlorite tend to aggregate together. Further increasing the pectin dosage reduces the recovery rate to 0%. FTIR and XPS analyses reveal that the –OH groups in pectin chemically interact with Mg atoms in chlorite. Zeta potential results show that pectin causes a significant downward shift in the zeta potential of chlorite.
研究领域:
矿物加工
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环境化学
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表面化学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yu Xie,Wanzhong Yin,Jin Yao,Xueming Yin,Jiayi Liu,Feijia Xue,Daolai Tian
Chalcopyrite and talc exhibit strong natural hydrophobicity, making it challenging for conventional inhibitors to effectively separate the two through flotation. This paper proposes a novel starch-modified reagent, Hydroxypropyl distarch phosphate (HDP), for the separation of chalcopyrite and talc. Micro-flotation test results indicate that HDP has a significant inhibitory effect on talc, while the flotation recovery of chalcopyrite is almost unaffected. Effective separation of chalcopyrite and talc can be achieved with the addition of only 5 mg/L of HDP. Zeta potential, adsorption amount, and FTIR tests reveal that HDP can selectively adsorb onto the surface of talc, with minimal adsorption on chalcopyrite. Further analysis through XPS and AFM indicates that HDP acts on the talc surface through physical adsorption, generating a larger phase angle to inhibit talc flotation. Concurrently, Density functional theory (DFT) simulation calculations suggest the presence of hydrogen bonding during the adsorption process between HDP and talc.
研究领域:
矿物加工工程
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表面化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jiaozhong Cai,Youming Ye,Jiushuai Deng,Qiming Wu,Bozeng Wu,Zhiqiang Geng,Pingxuan Cheng,Huaibin Kang
A key strategy for achieving the selective separation of talc and chalcopyrite is the development of chemical depressants with high solubility and strong selectivity. Tannic acid (TA), a polyphenol found in green plants and has good solubility, contains abundant phenolic hydroxyl groups. Moreover, the adsorption mechanism of TA with chalcopyrite and talc was examined after TA was chosen as the separation depressant for chalcopyrite and talc. Single-mineral flotation test results found that at optimal pH and TA and sodium butyl xanthate (SBX) dosages, the flotation recoveries of talc and chalcopyrite were 9% and 92.17%, respectively, and the difference in recovery between them was 83.17%. Results from real ores and artificially mixed minerals tests also confirmed that TA can achieve selective separation of chalcopyrite and talc. Since chalcopyrite has distinct electrochemical properties, the results of atomic force microscope and electrochemical tests demonstrated that there are significant differences in the adsorption behavior of TA on the surface of chalcopyrite and talc. And the adsorption selectivity of SBX on the chalcopyrite surface is better than that of TA on the chalcopyrite surface, which is an important reason for the selective separation of chalcopyrite and talc.
研究领域:
化学工程
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矿物加工
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电化学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122417
·
IF 7.5
Xianwen Zhu,Jinyue Yang,Runqing Liu,Yingjun Qiao,Zhong Liu,Zhiqiang Qian
To address the need for efficient separation of dyes and salts in textile wastewater, this study developed a novel two-dimensional talc nanofiltration membrane with high selectivity and fouling resistance. The membrane was constructed via vacuum-assisted self-assembly of exfoliated natural talc nanosheets with glycine (Gly) and chitosan (CS). The intercalation of Gly and CS achieved a synergistic functional coupling of “interlayer sieving” and “surface anti-fouling”: the former precisely tuned the spacing of the two-dimensional channels (∼9.20 Å), while the latter effectively smoothed the membrane surface. During dye/salt separation, the membrane exhibited outstanding performance, demonstrating a high rejection rate for Brilliant Blue (BB) dye (99.74%), a high permeation rate for sodium chloride (94.47%), and a water permeability of 60.95 L m −2 h −1 bar −1 . Furthermore, the introduction of trace amounts of CS significantly enhanced the anti-fouling properties of membranes. After ten fouling-cleaning cycles, the flux recovery rate (FRR) reached 80.06%, representing a 10.91% improvement over the unmodified membrane, while structural integrity and separation performance were well-maintained during long-term operation. This study provides a new strategy for designing high-performance dye separation membranes and broadens the application potential of natural clay minerals in wastewater treatment and resource recovery.
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高影响因子
Polymers
·
2024
·Vol. 17
·期 1
·67
·
IF 4.7
Xianrong Yang,Huan Shuai,Gaoxiang Du,Jiao Wang,Jie Shen
In this study, waterborne polyurethane (WPU), a novel modifier, was used for the wet surface modification of talc, and its mechanism was investigated. Polypropylene (PP)-based composites with modified talc were synthesized and subjected to an examination of their mechanical properties. The wetting contact angle demonstrated that the modified talc exhibited an excellent modification effect at a specific amount of modifier (2.0 wt.%). The X-ray diffraction (XRD), Fourier-transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) results indicated the successful coating of WPU on the surface of the talc particles. SEM images revealed that modified talc displayed improved wettability, compatibility, and dispersion in PP/talc + WPU composites. The mechanical properties results showed that the PP/talc + WPU composites ensured superior comprehensive properties with a flexural strength of 55.9 MPa, impact strength of 4.72 kJ/m2, tensile strength of 34.8 MPa, and elongation of breaks of 32.4%. The incorporation of WPU-modified talc into plastic materials has been synthesized to leverage its beneficial properties, leading to reduced production costs and improved performance and functionality of the final product.
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 5
·6133-6144
·
IF 5.1
Gan Wan,Lei Han,Zongliang Xiao
In the realm of advanced luminescent materials , glass-ceramic (GC) incorporated into rare earth (RE) represents a promising candidate. However, their practical application has been constrained by limitations in luminescence efficiency and thermal stability. This study overcomes these challenges by introducing a novel Eu 3+ -doped black talc GC with enhanced optical characteristics . Our method involved fabricating a new glass matrix and incorporating heavy concentrations of Eu 3+ ions. Following a precise nucleation-crystallization process, CaMgSi 2 O 6 nanoscale crystals were uniformly dispersed within the GCs matrix, markedly enhancing its luminescent properties. When excited by 394 nm light, this GC achieved a notable internal quantum efficiency (IQE) of 88.97 %, surpassing many traditional Eu 3+ -doped glasses and GCs. Furthermore, it retained 89.6 % of its luminescence intensity even at 100 °C, indicating remarkable thermostability. To validate the GC's practical utility, we integrated this material into a white light-emitting diode (W-LED) component, incorporating a LED chip, CaMgSi 2 O 6 : Eu 3+ GC, BaMgAl 10 O 17 : Eu 2+ , and Ba 2 SiO 4 : Eu 2+ phosphor. The fabricated device demonstrated excellent chromaticity coordinates of (0.3493, 0.3935), a correlated color temperature (CCT) of 4976K, and a prominent color rendering index (CRI) of 90.3. This research not only expands the potential applications of black talc, but the prepared GCs also exhibit excellent performance in luminescence properties, highlighting the broad application of this Eu 3+ -doped GCs in W-LED lighting technology.
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DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Saizhen Jin,Qing Shi,Qi Li,Leming Ou,Kai Ouyang
The effect of various calcium ionic concentration on the adsorption of carboxymethyl cellulose (CMC) onto talc surface has been investigated using flotation tests, adsorption measurements and tapping mode atomic force microscopy (AFM) imaging. Microflotation tests indicated that the depression of talc depressed by CMC was increasingly enhanced with the increase of Ca 2+ at pH 8.5. And within the pH range of 2–11.5, in the presence of Ca 2+ , the depression of talc by CMC could be facilitated by Ca 2+ stably. Adsorption experiments confirmed that with the increase of Ca 2+ , the adsorbed CMC on talc increased at pH 8.5. AFM imaging revealed the morphology of adsorbed CMC were different in the absence and presence of various Ca 2+ ions concentration. In the absence of Ca 2+ ions, the morphology of adsorbed CMC consisted of randomly distributed salient point domains with a lower area fraction of surface coverage; in the presence of 10 −4 mol/L Ca 2+ ions the morphology mingled with salient point and reticulate adsorption; in the presence of 10 −3 and 10 −2 mol/L Ca 2+ ions the morphology is a reticulate multilayer adsorption with a higher area fraction of surface coverage.
研究领域:
矿物加工工程
·
表面化学
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产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Yunhui Chen,Liping Wen,Jinxin Chen,He'an Luo,Jikai Liu
The clay mineral/g-C 3 N 4 composites were prepared through a simple one-pot synthesis with acid-treated clay minerals and melamine as precursors. Three typical clay minerals, e.g., kaolinite , sepiolite , and talc, were adopted as photocatalyst carriers. Notably, the acid-treated clay minerals coupled with g-C 3 N 4 in three different ways. The kaolinite/g-C 3 N 4 composite, in particular, proceeded with an intercalation reaction due to the in situ growth of g-C 3 N 4 within the layers of acid-treated kaolinite, leading to the expansion of kaolinite layers and a prominently large specific surface area of 61.9 m 2 g −1 . The resultant composites were used in photocatalytic H 2 generation by water splitting and CO 2 reduction, exhibiting superior photocatalytic performance to the g-C 3 N 4 . Among the obtained composites, the optimized kaolinite/g-C 3 N 4 showed the best photocatalytic activities , e.g. 3.03 μmol g −1 h −1 of CO evolution and 385 μmol g −1 h −1 of H 2 evolution, compared with merely 0.91 μmol g −1 h −1 of CO evolution and 96.4 μmol g −1 h −1 of H 2 evolution for bare g-C 3 N 4 . The superior performance of kaolinite/g-C 3 N 4 can be ascribed to the large specific surface area and better distribution of g-C 3 N 4 , which can enhance the light absorption , increase the number of active sites and favor the charge separation.
研究领域:
材料科学
·
光催化
·
太阳能转换
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DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Jiaozhong Cai,Shuiping Zhong,Jiushuai Deng,Bozeng Wu,Chengyan Xu,Xiaopeng Chi,Guangsheng Zeng,Wei Weng,Wen Tan,Junnan Chen
Talc is a layered silicate mineral with pronounced crystal anisotropy, consisting of a basal (001) surface and an edge (100) surface, which complicates its separation from valuable minerals. In this study, tannic acid (TA) was used as a depressant, and its adsorption behaviors on the two representative surfaces of talc—silica (basal plane surface) and magnesium silicate (edge surface)—were systematically investigated using experimental methods and molecular simulations. TA addition reduced the contact angles of the talc basal and edge surfaces by 30.5° and 22.7°, respectively, indicating enhanced hydrophilicity. ToF-SIMS analysis revealed that TA physically adsorbs onto the silica surface, while both physical and chemical interactions occur on the magnesium silicate surface. AFM showed lumpy adsorbate on the silica surface and point-like adsorbate on the magnesium silicate surface, with a greater roughness change observed for the former. QCM-D measurements confirmed that TA formed a multilayer flexible adsorbate on the silica surface and a dense, rigid monolayer on the magnesium silicate surface. Molecular dynamics simulations further revealed that van der Waals interactions dominated TA adsorption on the (001) surface, while electrostatic interactions prevailed on the (100) surface. These findings provide insight into the selective depression mechanism of talc and offer guidance for the depression of other layered silicate minerals.
研究领域:
矿物加工
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表面化学
·
分子模拟
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DOI
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Xiaohua Nie,Xiaoyu Zhou,Liyu Hua,Yuanchao Lu,Ningxiang Yu,Xianghe Meng
Oleosomes as natural oil droplets are prone to severe emulsification in aqueous enzymatic extraction (AEE) of I. polycarpa fruit oil, limiting the recovery of free oil. This study aimed to investigate simultaneous destabilization and potential mechanism of short-chain alcohol (ethanol, EA; isopropanol, IPA) with talc on the oleosomes. EA, IPA, and their combination with talc improved the extraction of free oil, especially EA-Talc making the oil recovery rate up to that of IPA. The oleosomes were significantly destabilized, indicated by the decrease in absolute ζ-potential and rheological behaviors (apparent viscosity, G′, and G″) as well as the increase in droplet size. Furthermore, oleosome instability was positively corrected with the reduction of protein, pectin, and phenolics contents at the interface. The presence of extrinsic and intrinsic proteins were lessened in the oleosomes; and native β -sheet of oleosome-related proteins were turned into α -helix, denatured β -sheet and β -turn, along with the exposure of tryptophan residues to aqueous phase. It was noted that IPA exhibited a better disruptive effect on the oleosomes than EA, and both of the alcohols exerted a combinedly action with talc. Therefore, the results demonstrated that EA, IPA, and their combination with talc had caused oleosome instability, and it was largely ascribed to the removal and structural unfolding of oleosome-related proteins. In view of food safety and regulatory acceptance, EA with talc might be used as an effective destabilizer of the oleosomes in the AEE of I. polycarpa oil.
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DOI
PubMed
高影响因子
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