MINERALS ENGINEERING
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2021
·
IF 4.765
Wenxuan Huang,Wenbiao Liu,Wenlin Zhong,Xiaopeng Chi,Feng Rao
In this study, the effects of common ions, especially Ca 2+ , on the reverse flotation of fluorapatite and dolomite in acidic conditions with NaOL collector were investigated using micro-flotation, zeta potential, contact angle, adsorption analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory-based first principal calculations. It is found that the dolomite flotation recovery was enhanced and the fluorapatite flotation was depressed by the addition of CaCl 2 at pH 5. For dolomite, in the presence of CaCl 2 , the solubility of metal ions was increased, especially for Ca 2+ . The Ca and Mg sites exposed on the dolomite surface, increased the NaOL adsorption, thus, enhancing the dolomite flotation. However, the formation of Ca(H 2 PO 4 ) 2 species on fluorapatite surface inhibit its flotation.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Di Meng,Haipeng Xie,Bin Yan,Weixuan Zhao,Yiming Fu,Wenjihao Hu,Yongli Gao
Quartz is a key raw material in high-tech fields (such as photovoltaics and semiconductor microelectronics), and the most efficient extraction method of quartz is mineral flotation. Quartz activation plays a crucial role in mineral flotation. However, the mechanism underlying the process remains unclear, and the role of additional metal ions is controversial. In this study, the interaction forces between the quartz surface, the dodecylamine (DDA) cation/sodium oleate (NaOL) anion mixed collectors, and Ca2+ were analyzed using atomic force microscopy in order to systematically explore the activation process of quartz flotation. The results confirmed that the activation process was initialized from NaOL, which was adsorbed on the surface of a calcium-covered quartz surface. The existence of DDA inhibited the binding of Ca2+ to NaOL so that more Ca2+ was adsorbed on the quartz surface to provide the adsorption site for NaOL. Moreover, the best adsorption condition of Ca2+ + NaOL + DDA mixed solution was analyzed by quartz crystal microbalance with dissipation, and it demonstrated that the most stable chemisorption environment on the quartz surface was at pH 11.0. In these circumstances, Ca2+ could first adsorb in a point-like manner on the quartz surface, which was then adsorbed with a mixture of NaOL and DDA. This result showed that, at a specific pH, Ca2+ could encourage the coadsorption of cationic/anionic mixed collectors on quartz. This work provides an important new understanding of the intermolecular interactions that take place during complex mineral flotation processes between chemical additives and mineral surfaces. The methodology used in this study can be easily adapted to different interfacial processes, including water treatment, membrane technology, bioengineering, and oil production.
研究领域:
矿物浮选
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界面化学
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材料科学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
An Liu,Pan-pan Fan,Feng Han,Hua Han,Zhi-hong Li,Huai-fa Wang,Min-qiang Fan
In this study, the electroflotation of quartz and magnetite with cationic collector dodecylamine (DDA) and anionic collector sodium oleate (NaOL) were investigated to gain a better understanding of the electroflotation process and identify methods to improve it. An interesting phenomenon accompanied with obvious promotion (NaOL is used as collector) and inhibition (DDA-HCl is used as collector) of quartz flotation was observed after electrolysis. The obvious promotion arouse from the supply of the metal cations as active site for the adsorption of negatively charged group and increase active collecting species ionic forms RCOO - and (RCOO) 2 2– . Conversely, the obvious inhibition originated from the decrease of the active collecting species RNH 3 + and (RNH 3 ) 2 2+ . An obvious inhibition phenomenon was observed after the electrolysis for the magnetite. This is because the active collecting species RNH 3 + , (RNH 3 ) 2 2+ , RNH 2 ·RNH 3 + and RCOOH molecule decreased significantly after electrolysis. Furthermore, a comparison test between the regular flotation and electroflotation was conducted in the reverse flotation of magnetic separation concentrate. Compared with the regular flotation process, electroflotation flotation was characterized by simple reagent regime (without pH regulator and activator) and moderate conditions (natural pH), which had mild operation condition superiority. Moreover, the flotation product index of electroflotation can be better through slightly adjusting the reagent regime, and it can be certain that electroflotation is an effective process in the reverse flotation of magnetite. These findings provided a novel perspective for understanding the electroflotation process.
研究领域:
矿物加工工程
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浮选化学
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DOI
高影响因子
Minerals
·
2018
·Vol. 8
·期 8
·313
·
IF 1.835
Jianjun Wang,Zihan Zhou,Yuesheng Gao,Wei Sun,Yuehua Hu,Zhiyong Gao
Fluorite (CaF2), as an important strategic mineral source, is usually separated from calcite by the common froth flotation method, but this separation is still not selective enough. The development of a selective collector and/or depressant is the key to achieving high selective separation. 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP or H4L) is widely used as an environmentally friendly water treatment reagent due to its low cost and excellent anti-scaling performance in an aqueous solution. In this study, a novel reagent scheme was developed using HEDP as a fluorite depressant and sodium oleate (NaOL) as a calcite collector for the first time. When 3 × 10−5mol/L of HEDP and 6 × 10−5mol/L of NaOL were used at pH 6, the optimal selective separation for single minerals and mixed binary minerals was obtained. Zeta potential measurements indicated that HEDP possessed a stronger adsorption on fluorite than calcite, while NaOL did the opposite. This novel reagent scheme is of low cost, uses a small dosage, and is friendly to the environment, which makes it a promising reagent scheme for fluorite flotation in industrial application.Keywords:fluorite;calcite;flotation;1-hydroxyethylidene-1,1-diphosphonic acid;sodium oleate
研究领域:
矿物加工工程
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环境科学
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DOI
高影响因子
Polymers
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2022
·Vol. 14
·期 19
·4187
·
IF 4.967
Jia Qu,Liangliang Chang,Mingbao Liu,Baoyue Cao,Meilan Li,Qiang Yang,Wei Gong
Beneficiation wastewater contains various types of pollutants, such as heavy metal ions and organic pollutants. In this work, a silica-based amphiphilic block copolymer, SiO2–g–PBMA–b–PDMAEMA, was obtained by surface-initiated atom transfer radical polymerization (SI-ATRP) for Cu(II) and sodium oleate adsorption in beneficiation wastewater, using butyl methacrylate (BMA) as a hydrophobic monomer and 2-(dimethylamino)ethylmethacrylate (DMAEMA) as a hydrophilic monomer. FTIR, TGA, NMR, GPC, XRD, N2adsorption–desorption isotherms and TEM were used to characterize the structure and morphology of the hybrid adsorbent. The introduction of PBMA greatly increased the adsorption of sodium oleate on SiO2–g–PBMA–b–PDMAEMA. Adsorption kinetics showed that the adsorption of Cu(II) or sodium oleate on SiO2–g–PBMA–b–PDMAEMA fitted the pseudo-second-order model well. Adsorption isotherms of Cu(II) on SiO2–g–PBMA–b–PDMAEMA were better described by the Langmuir adsorption isotherm model, and sodium oleate on SiO2–g–PBMA–b–PDMAEMA was better described by the Freundlich adsorption isotherm model. The maximum adsorption capacity of Cu(II) and sodium oleate calculated from Langmuir adsorption isotherm equation reached 448.43 mg·g−1and 129.03 mg·g−1, respectively. Chelation and complexation were considered as the main driving forces of Cu(II) adsorption, and the van der Waals force as well as weak hydrogen bonds were considered the main driving forces of sodium oleate adsorption. The adsorbent was recyclable and showed excellent multicomponent adsorption for Cu(II) and sodium oleate in the mixed solution. SiO2–g–PBMA–b–PDMAEMA represents a satisfying adsorption material for the removal of heavy metal ions and organic pollutants in beneficiation wastewater.Keywords:silica;amphipathic;block copolymer;adsorption;beneficiation wastewater;Cu(II);sodium oleate
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuanbo Zhang,Hua Chen,Zijian Su,Zhidong Jiang,Kaiao Shen
Tin is a strategically important metal used in electronics, alloy manufacturing, and renewable energy. Approximately 80 % of global tin production is derived from cassiterite (SnO 2 ) beneficiation; The reserves of high-quality tin ore are gradually decreasing, and the research focus on tin extraction is shifting toward the recycling and reuse of tailings. However, tin and iron in tin–iron tailings are strongly intergrown, making separation challenging. Previous studies have demonstrated that a calcination roasting–magnetic separation process under a CO/CO 2 atmosphere can convert iron into Fe 3 O 4 , thereby leaving tin in the form of nonmagnetic calcium stannate (Ca 2 SnO 4 ) to achieve effective tin–iron separation. Nevertheless, the tin content in the nonmagnetic fraction is only 0.5–1.0 %, which is far below the economic threshold for recovery by fumigation. Therefore, innovative pre-enrichment strategies are urgently needed to improve tin recovery efficiency. This study explores the feasibility of flotation of synthetic calcium stannate (Ca 2 SnO 4 ) using two commonly employed collectors: sodium oleate (a representative fatty acid) and benzohydroxamic acid (a typical hydroxamic acid). The recovery performance of calcium stannate (Ca 2 SnO 4 ) was evaluated by micro-flotation tests, and the chemical interactions induced by collector adsorption, as well as the adsorption mechanism, were elucidated in depth employing FTIR, XPS, and DFT simulations. The results reveal that NaOL, with its strong ligand bonding under alkaline conditions, substantially boosts flotation recovery-reaching up to 83.56 %. These findings offer practical guidance for optimizing flotation processes in tin recovery from the tin-bearing tailings.
研究领域:
矿物加工工程
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材料科学
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计算化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Chaobo Zhang,Xiaoyong Yang,Jian Dai,Wenxia Liu,Hang Yang,Zhishan Bai
Phenolic wastewater is one of the priorities in the field of wastewater treatment , which poses a serious threat to the human health and nature environment. In this paper, cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium oleate (NaOL) microemulsions were utilized to extract phenol from the wastewater. The optimal extraction factors were investigated by exploring the effects of microemulsion composition ratio and extraction conditions on the phenol extraction performance. Furthermore, the enhanced extraction mechanism of phenol by cations microemulsions is illustrated by studying the extraction process of cationic and anionic microemulsions in the extraction of phenol. The optimum components were obtained: surfactant concentration of 0.2 mol·L –1 , isoamyl alcohol volume of 30%, internal aqueous phase concentration of CTAB microemulsion of 0.05 mol·L –1 , and internal aqueous phase concentration of NaOL microemulsion of 0.09 mol·L –1 . The extraction efficiencies were 96.44% and 82.0% when using CTAB and NaOL microemulsions under optimal conditions (water–emulsion ratio of 5, contact time of 9 min, extraction temperature of 298.15 K, and pH of 9), confirming the enhanced extraction of phenol by CTAB cationic microemulsion. It was analyzed that the enhanced extraction of CTAB microemulsion was due to the electrostatic adsorption of cations with phenol root ions.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 4
·510-518
·
IF 1.982
Yanjun Zhao,Weiyu Yao,Yu Wang,Quan Wang,Feipeng Lou,Weihong Guo
Graphene (G) has attracted great interest because of its excellent chemical and electrical properties. However, the aggregation of graphene restricts its application. Herein, linoleic acid sodium salt (LASS), a low-cost and environmentally friendly material, was used to improve the dispersion of graphene through covalent interaction. Then, the mixture (G@LASS) was integrated with acrylic resin matrix via hydrogen bond between the carboxyl and ester groups. The excellent interfacial compatibility between G@LASS and acrylic matrix, as well as good dispersibility of G@LASS, was demonstrated by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman, and scanning electron microscopy tests. Compared with acrylic matrix, the surface hydrophobicity of G@LASS@Acrylic increased considerably because of its compact structure. G@LASS@Acrylic composites meet the requirement of antistatic materials when the content of G was only about 0.5 wt%. The results showed that conductive pathways were established successfully through this method.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
BMC CANCER
·
2021
·Vol. 21
·期 1
·1-10
·
IF 4.43
He Ping,Cheng Shihuan,Hu Feng,Ma Zhanchuan,Xia Yan
Background Diacylglycerol-acyltransferase 1 (DGAT1) plays an important role in the energy storage and is involved in cancer progression. A growing number of evidences showed that elevated expression of DGAT1 in cancer tissue indicated a poor outcome in cancer patients. However, the relationship between DGAT1 and gastric cancer is still unclear. Thus, Transcriptomic analysis and in vitro experiments were performed to investigate the role of DGAT1 in gastric cancer, as well as the potential therapy target in gastric cancer treatment.Methods We screened the public cancer datasets to identify the expression and function of DGAT1 in gastric cancer and tumor infiltrating lymphocytes. Then we testified the DGAT1 expression and function after sodium oleate treatment in AGS and MKN45 cell line. Finally, we analyzed ration of apoptosis, necrosis in gastric cancer cells by using flow cytometry after administration of DGAT1 inhibitor.Results Our results showed a highly expression of DGAT1 in gastric cancer tissues (n = 5, p = 0.0004), and tumor-infiltrating macrophages with elevated DGAT1 expression is associated with poor overall survival in gastric cancer patients. In addition, gastric cell lines AGS (n = 3, p < 0.05) and MKN45 (n = 3, p < 0.01) expressed higher level of DGAT1 than human gastric mucosal epithelial cell line GES-1. Administration of DGAT1 inhibitor effectively suppressed functional factors expression and induced cell death in MKN45.Conclusion The findings of this research provide an in-depth insight into the potential role and influences involved in DGAT1 in the gastric cancer patients. And higher expression of DGAT1 leads to lower overall survival (OS) rate in patients with poorly differentiated gastric cancer. Our findings suggest a potential role for DGAT1 in the gastric cancer progression and inhibiting DGAT1 might be a promising strategy in gastric cancer treatment.
研究领域:
肿瘤学
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分子生物学
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癌症治疗
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xin Hu,Xianping Luo,Zishuai Liu,Hepeng Zhou,Xuekun Tang,Zhizhao Yang,Siqi Yang
Quartz and feldspar, both framework silicates, exhibit remarkably similar physicochemical properties, rendering their efficient flotation separation a persistent challenge in mineral processing. Conventional collector systems typically require strongly acidic conditions for effective separation yet still suffer from suboptimal concentrate grades or recoveries. To mitigate water contamination from acidic wastewater discharge and achieve highly selective flotation separation of quartz and feldspar, this study introduces a novel collector combination—tributyl tetradecyl phosphonium chloride (TTPC) and sodium oleate (NaOL). This system enables selective surface modification of the minerals under neutral pH conditions, thereby accomplishing highly efficient separation. Micro-flotation and artificial mixed ore tests demonstrate TTPC's superior affinity for quartz over feldspar, with NaOL further optimizing separation performance. Floation of artificially mixed ore (initial grades: 82.70 % SiO₂, 10.71 % Al₂O₃) yielded exceptional results: a concentrate grading 98.77 % SiO₂ at 51.80 % recovery, alongside tailings assaying 18.61 % Al₂O₃ with 98.42 % recovery. Mechanistic investigations utilizing a multimodal approach—including high-speed imaging, contact angle measurements, Fourier transform infrared (FTIR) spectroscopy, zeta potential analysis, and X-ray photoelectron spectroscopy (XPS)—elucidated the selective adsorption behavior. Under single-reagent conditions, NaOL shows negligible adsorption on either mineral, while TTPC undergoes electrostatic adsorption on both. During co-treatment, synergistic adsorption of TTPC and NaOL occurs exclusively on quartz, enhancing its floatability. Conversely, NaOL impedes TTPC adsorption on feldspar, maintaining its hydrophilicity. This amplified flotation response differential enables highly selective separation. A conceptual model elucidating the selective adsorption mechanisms on both mineral surfaces is proposed.
研究领域:
矿物加工工程
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表面与界面化学
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资源与冶金工程
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胶体与界面科学
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环境友好工艺
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shengzong Lan,Liuyang Dong,Tianfu Zhang,Dianwen Liu,Zhengchang Shen
This study investigates the role of Na 2 SO 4 as an inorganic regulator in enhancing the flotation separation efficiency of apatite from dolomite by mitigating the adverse effects of interfering ions. Micro-flotation tests revealed that adding 3 × 10 −4 mol/L Na 2 SO 4 significantly increased the recovery of dolomite from 77.52 % to 91.26 %, while reducing the recovery of apatite by 16.31 %. The MgO content in the mixed concentrate rose from 9.69 % to 15.05 %, with its removal rate increasing from 54.76 % to 82.53 %. Importantly, the loss rate of apatite in the mixed concentrate was reduced by 33.37 %. Characterization techniques and solution properties analysis elucidated the mechanism: Na 2 SO 4 prevents the formation of precipitates between interfering ions and sodium oleate (NaOL), reducing NaOL adsorption on apatite surfaces while enhancing and evenly distributing NaOL adsorption on dolomite surfaces. molecular dynamics simulations further showed that Ca 2+ and Mg 2+ promote NaOL agglomeration, whereas Na 2 SO 4 disperses NaOL uniformly in solution. This study provides an innovative for enhancing the anti-interference ion ability of flotation reagents.
研究领域:
矿物加工
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浮选技术
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无机化学
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表面化学
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分子动力学
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产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Jie Chen,Jinyi Chen,Juan Zhang
In this study, a hydrophobic NH 2 -UiO-66@NaOA composite was developed as an advanced SPME coating for efficient extraction and sensitive detection of polycyclic aromatic hydrocarbons (PAHs) in environmental and food matrices. Surface functionalization with sodium oleate (NaOA) effectively addressed the moisture resistance limitations of conventional MOFs, forming a stable hydrophobic layer while maintaining crystalline integrity. The modified material exhibited enhanced PAHs extraction efficiency through synergistic π-π stacking and hydrophobic interactions. Combined with GC-FID analysis, the optimized method demonstrated excellent sensitivity (LODs: 0.014–0.083 ng mL −1 ), wide linear range (0.2–200 ng mL −1 , R 2 > 0.99), and good reproducibility (RSD ≤ 7.71 %). Successful application was demonstrated in environmental water samples (lake water, wastewater) and food matrices (honey, black tea), showing reliable performance in complex sample analysis. The developed modification strategy showed broad applicability, as confirmed through successful extension to other MOF structures (ZIF-8, NH 2 -MIL-88). These results highlight the composite's potential as a robust SPME coating for monitoring trace-level persistent organic pollutants in environment and food safety applications.
研究领域:
分析化学
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环境科学
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食品安全
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材料科学
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污染物检测
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色谱分析
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）