MINERALS ENGINEERING
·
2021
·
IF 4.765
Bin Yang,Ya-Feng Fu,Wan-Zhong Yin,Qiu-Yue Sheng,Zhang-Lei Zhu,Xue-Ming Yin
In this study, laurylamine ethoxylate with fifteen ethoxylate units (LAEO-15) was employed as a quartz collector for the recovery of malachite from quartz via reverse flotation. Its collecting performance and adsorption mechanism were evaluated by flotation tests and surface analyses. The results of flotation tests suggested that LAEO-15 had an intense ability to collect quartz instead of malachite, and displayed a high flotation selectivity, which promoted the significant floatability differences of both minerals. XPS confirmed that quartz adsorbed a much larger quantity of LAEO-15 than malachite, resulting in the selective collection of quartz with LAEO-15. Zeta potential and FTIR characterization further uncovered that the strong adsorption of LAEO-15 was driven by hydrogen bonding and electrostatic attraction, while electrostatic repulsion hindered the LAEO-15 adsorption on the surface of malachite. As a result, the effective separation of malachite and quartz was realized with 20 mg/L LAEO-15 at pH 6.30 via reverse flotation, in which 92.54% of malachite was recovered and 92.72% of quartz was removed, coupled with a high SI value of 12.57 in concentrate. Therefore, compared with conventional collector dodecylamine, LAEO-15 exhibited high selectivity and purification effectiveness for the separation of malachite from quartz.
研究领域:
矿物加工工程
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材料科学与工程
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2019
·Vol. 57
·期 19
·2030-2037
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IF 2.591
Muhammad Waqas Ali,Siyuan Cheng,Jianhao Si,Muhammad Siddiq,Xiaodong Ye
Hyperbranched poly(2-ethyl-2-oxazoline) was synthesized by a combination of cationic ring-opening polymerization and the oxidation of thiol to disulfide groups. A three-arm star poly(2-ethyl-2-oxazoline) (PEtOx) was first synthesized using 1,3,5-tris(bromomethyl) benzene as an initiator. The star PEtOx was end-capped with potassium ethyl xanthate. Similarly, a linear PEtOx was synthesized and end-capped with potassium ethyl xanthate using benzyl bromide as an initiator. Hyperbranched PEtOx was then obtained by in situ cleaving and subsequent oxidation of the star PEtOx and linear PEtOx mixture with n -butylamine as both a cleaving agent and a base in tetrahydrofuran. The linear PEtOx was used to prevent the formation of gel. The hyperbranched PEtOx can be cleaved with dithiothreitol to trithiol and monothiol polymer. The hyperbranched PEtOx shows no remaining thiols using Ellman's assay. The resulting hyperbranched PEtOx was hydrolyzed to a novel hyperbranched polyethyleneimine with degradable disulfide linkages. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2030–2037
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2020
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IF 3.612
Jiyuan Li,Zhuxiu Zhang,Mifen Cui,Qing Liu,Zhaoyang Fei,Xian Chen,Jihai Tang,Xu Qiao
The acid-catalyzed Markovnikov addition of isobutene is affected by the concomitant isobutene oligomerization. Herein, a solid acid catalyst consisting of the sulfonated silica modified with crystalline ZrSiO 4 was prepared, and the ZrSiO 4 /SiO 2 -SO 3 H catalyst went beyond conventional acid catalysts in the hydroacetoxylation of isobutene. The structure of the catalyst was well-characterized, and the role of ZrSiO 4 in suppressing the dimerization of isobutene was discussed in terms of both kinetic study and in-situ DRIFT analysis. Moreover, this catalyst also showed general applicability for a broad substrate scope, further highlighting the necessity of ZrSiO 4 in the solid acid catalyst.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Bin Yang,Wan-Zhong Yin,Jin Yao,Zhang-Lei Zhu,Hao-Ran Sun,Ke-Qiang Chen,Li-Ying Wang
Different adsorption behaviors of the collector on the mineral surface play a crucial part in the flotation separation of different minerals by selectively modifying the wettability of mineral surfaces. In this investigation, to effectively remove quartz from hematite via reverse flotation, decaethoxylated stearylamine (DEOSA) was first introduced as a high-performance collector for quartz. The selective collecting performance and differential adsorption mechanisms of DEOSA for both hematite and quartz were studied by flotation experiments and surface analysis. Flotation results suggested that DEOSA displayed excellent collecting capacity for quartz against hematite and the effective removal of quartz from hematite was achieved. Adsorption capacity measurements and surface wettability analysis demonstrated that much larger amounts of DEOSA adsorbed onto quartz than hematite significantly enhanced the quartz surface hydrophobic whether the depressant starch was present or not, which resulted in the excellent flotation performance of quartz. Surface electrical characterization and Fourier transform infrared (FTIR) analysis further proved that the combination of hydrogen bonding and electrostatic attracting force enhanced the strong adsorption of DEOSA onto the quartz, achieving the efficient collection performance of DEOSA for quartz. Based on these findings, DEOSA can be used potentially as a strong-collection and high-performance quartz collector for recovering hematite from quartz via reverse flotation.
研究领域:
矿物加工工程
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界面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yingxue Li,Jingjie Zhou,Yong Zhang,Huibin Liang,Jinyuan Sun,Yuqi Liu,Gerardino D’Errico,Yongqiang Sun,Martino Di Serio
Various catalysts were used to catalyze the ethoxylation reaction of C12–14 primary alcohols with ethylene oxide. Alcohol ethoxylates with a ratio of ethylene oxide/substrate near 3 were synthesized. The catalysts influenced the reaction rate, molecular weight distribution of adducts, and formation of byproducts. The physicochemical properties of ethoxylates obtained using different catalytic systems were analyzed, and their functional properties, i.e., wetting and permeation, were investigated. The results showed that the products obtained using the catalysts MCT-09 and NAE-03 had a narrower oligomer distribution and excellent wetting properties compared with those obtained using conventional ethoxylation catalysts.
研究领域:
化学工程
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材料科学
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表面活性剂研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Simeng Li,Xiaohui Li,Chen Zhang,Bowen Li,Peiwen Yu,Qin Dai,Hongping Wang,Fen Jin
Trisiloxane ethoxylates (TSEO n ) have been found in multiple agro-environmental media due to their pervasive application in agricultural production. While some studies suggested that the differences in the toxicological effects of TSEO n were closely related to their end-capping groups, the environmental behaviors and fate of TSEO n congeners with varying end-capping groups in agroecosystems remain underexplored. This study investigated the dissipation patterns of 39 oligomers across three TSEO n congeners in cucumber, leaves, and soils through field trials, including TSEO n -H (hydroxy, n = 2 to 14), TSEO n -CH 3 (methoxy, n = 2 to 14), and TSEO n -COCH 3 (acetoxy, n = 3 to 15). All TSEO n oligomers dissipated following pseudo-first-order kinetics in cucumber, leaves, and soils with half-lives were 2.08-3.92 d, 1.77-4.44 d, and 5.06-19.80 d, respectively. TSEO n congeners in agro-environmental media presented different dissipation patterns affected by their end-capping groups. The interfacial behaviors of TSEO n -COCH 3 in the leaves differed from those of TSEO n -H and TSEO n -CH 3 . The half-lives of TSEO n -H and TSEO n -CH 3 congeners in soils were significantly positively correlated with log K OC , indicating that long-chain congeners preferentially partition to soil solid phases, leading to slower dissipation rates than short-chain congeners. Furthermore, long-chain TSEO n congeners may dissipate to short-chain congeners. The dietary risks of ΣTSEO n -CH 3 intake through cucumber fruits were deemed safe for different Chinese populations based on the margin of exposure (MOE) assessment. This study alerts us to the environmental behaviors and fate of organosilicone surfactants and provides a baseline reference to the dietary exposure risks of TSEO n .
研究领域:
环境科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yu Lang,Jingjie Zhou,Jinyuan Sun,Huibin Liang,Ke Zhang,Chunyu Wang,Yuqi Liu,Tao Geng
Surfactant reduces the surface tension of liquids, resulting in improved emulsion stability, and there is great interest in pesticide additives. Ethoxylate is often used as a pesticide emulsifier. However, the degree of ethoxylation and the existence of dioxane byproducts can significantly affect the performance of emulsifiers. Here, a series of polyoxyethylene tallow amines with the addition of different numbers of ethylene oxide (EO) were synthesized and characterized. Their physical and chemical performances were measured. The ability of POEA as a surfactant to reduce water surface tension and the surface adsorption of molecules were assessed based on the static and dynamic surface tensions. The results show that the surfactant molecules preferentially form a saturated adsorption layer in solution, and the mixed-diffusion-kinetics mechanism dominates the adsorption process. With the increase of the EO addition number, the emulsifying property of POEA increases, while the wetting property gradually decreases and the contact angle increases. These results can provide a basis for the selection of pesticide additives. At the same time, the mechanism of removing dioxane by ethoxylate is described, and a simple and low-consumption method is put forward to reduce the dioxane content. It provides a new idea for the removal of dioxane.
研究领域:
农药科学
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表面化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Han Jia,Jinyong Song,Yuqian Sun,Mingming Xu,Xiaolong Wen,Ziwei Wei,Xu Li,Bowen Wang,Kaihe Lv,Dexin Liu
The salinity seriously affects the recovery efficiency of surfactant flooding, and it is demonstrated the introduced ethoxy (EO) groups can enhance the interfacial activity of surfactants at harsh salinity via various experimental methods. In this study, sodium dodecyl sulfate (SDS) and sodium dodecyl ether sulfate (AES) are selected to investigate the effects of EO group number on the salt resistance of surfactants at the air/water interface by experiments and molecular dynamics (MD) simulation method. Optical microscopy and static multiple light scattering results show that the AES stabilized emulsions with Ca 2+ ions have better stability than those of SDS, which is further explored by molecular MD simulation method. The interface formation energy (IFE) and self-diffusion coefficients ( D α ) are calculated to systematically study the effects of introduced EO group number on calcium resistance of surfactants. The interaction between surfactants and Ca 2+ ions at the oil/water interface is evaluated by the potential of mean of force (PMF) and the radial direction functions (RDF), which is confirmed by the calculation of molecular electrostatic potential (MEP) and coordination number . The simulation results indicate that the introduced EO groups can combine Ca 2+ ions to fabricate salt bridge via intermolecular or intramolecular interactions to highly improve the calcium resistance of surfactants. The present work proposes a microcosmic perspective of the roles of EO group number on the calcium resistance of AES at the oil/water interface.
研究领域:
化学工程
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界面科学
·
分子模拟
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Han Jia,Jinyong Song,Yuqian Sun,Mingming Xu,Chuanqi Li,Ziwei Wei,Wenxin Cao,Xiyang Wang,Kaihe Lv,Dexin Liu
The high density and viscosity of heavy crude oil seriously affect the production and transportation processes, and surfactant emulsification and viscosity reduction technology are regarded as the ideal methods to enhance oil recovery of heavy oil reservoirs. In the present paper, sodium dodecyl sulfate and sodium dodecyl ether sulfate are used to study the effects of the number of introduced ethoxy (EO) groups on the emulsification and viscosity reduction of surfactants through the experimental method, molecular dynamics simulation, and quantum chemical calculations. The results of optical microscopy and viscosity measurement show that the surfactants can change the emulsion type of heavy oil to cause a remarkable reduction of emulsion viscosity. Then, the molecular density, interfacial thickness, and hydrogen bond relaxation time are computed to study the change of the properties of an interfacial film with additional surfactants. The interaction among surface-active substances is evaluated by radial direction functions and the independent gradient model based on the Hirshfeld partition method, which is confirmed through the steered molecular dynamics simulation method. The simulation results indicate that the surfactants containing more EO groups show better adsorption behavior to enhance the interfacial hydrophilicity and destroy stacking structures among asphaltene and resin molecules, which is conducive to the emulsification and viscosity reduction process. This work presents a nanometer view of the effects of the number of introduced EO groups on the emulsification and viscosity reduction mechanisms of anionic–nonionic surfactants.
研究领域:
石油工程
·
物理化学
·
计算科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2023
·
IF 3.9
Cheng Zhang,Yi Zheng,Jianfeng Li,Hongzhang Cao,Yanhui Xu,Weisheng Liu,Zhengping Dong
Selective hydrogenation of alkynol compounds to produce high value-added enols is an important reaction in the fine chemical industry. The construction of selective hydrogenation catalysts for alkynols is challenging because the alkynyl group is prone to over hydrogenation and the selectivity in the hydrogenation is always low. Herein, a simple sacrificial template strategy was designed to prepare mesoporous CeO2, on which ultrafine and highly-dispersed bimetallic PdCu nanoparticles were anchored, obtaining the PdCu@CeO2 catalyst. Introducing non-precious metallic Cu can improve the selectivity of precious metal Pd catalysts for the selective hydrogenation of alkynols through electronic and geometric modulation. The obtained PdCu@CeO2 catalyst showed high selectivity (99%) and good recyclability for the selective hydrogenation of the probe compound propynol ethoxylate under mild conditions. The PdCu@CeO2 catalyst also exhibited excellent performance in the catalytic selective hydrogenation of various substituted alkynols. Therefore, this research work provides a feasible strategy for the effective regulation of catalytic performance, which has potential application for the efficient catalytic selective hydrogenation of alkynols in the fine chemical industry.
研究领域:
催化化学
·
材料科学
·
精细化工
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2015
·
IF 2.515
Jieqiong Qin,Zhiping Du,Xiaoyuan Ma,Yanyan Zhu,Guoyong Wang
A series of butynediol-ethoxylate based polysiloxanes (PSi-EOs) with same composition but different lengths of siloxane backbone were designed and synthesized via hydrosilylation reaction. Their physicochemical properties and application performances have been discussed. With the increase of the length of siloxane backbone, the critical aggregation concentration (CAC) decreases and the surface tension at CAC (γ CAC ) increases, but the dynamic adsorption at the air/water interface has no significant change. Above the CAC, all of these three surfactants can self-assemble into spherical aggregates of 100 to 500 nm in aqueous solution. Moreover, the contact angle measurement on Paraffin film demonstrates that shorter siloxane backbone length of PSi-EO leads to lower contact angle and shows better spreading and wetting abilities. Using the foaming power test, PSi-EO with a longer siloxane backbone exhibits lower foaming and more effective anti-foaming properties in water.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Qingwen Dong,Xu Li,Jinxiang Dong
A new series of bio-based branched nonionic surfactants (ethoxylated dihydroxy stearic acid methyl ester, DMOE n ) was synthesized and characterized. DMOE n was based on a hydroxyoctadecanoic acid methyl ester, which was obtained from renewable oleic acid in waste cooking oil. These new polyoxyethylene surfactants contained double hydrophilic and hydrophobic chains, which shows the surface properties of the branched surfactant. The synthesis rules and reaction kinetics were studied in detail. The physicochemical properties and surface properties of the DMOE n with different degrees of ethoxylation at various concentrations were investigated. Furthermore, the surface tension results indicate that DMOE n reduced the surface tension reduction and increased the diffusion rate in an aqueous solution. The dynamic contact angle, wettability, foaming properties, and emulsifying capacity tests showed that DMOE n exhibited good wetting performance, low foaming, fast defoaming, and excellent emulsifying ability, which shows that the surfactant has potential application in industrial cleaning.
研究领域:
化学工程
·
材料科学
✓ 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）