APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jinchan Feng,Bingqiao Yang,Huanyu Zhu,Hanquan Zhang,Mengyuan Zeng
In this work, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was explored as a novel sphalerite depressant in the selective flotation of galena from sphalerite. The separation performances were investigated by single and synthetic flotation tests. The depression mechanism was examined by Fourier Transform Infrared spectroscopy (FTIR), zeta potential and X-ray Photoelectron Spectroscopy (XPS) analysis. The flotation test results showed that PBTCA was an effective sphalerite depressant with good selectivity at broad pH range, which could achieve satisfactory separation results. Zeta potential and FTIR results indicated that PBTCA was more prone to adsorb on sphalerite surface than that of galena. In addition, SIBX could replace adsorbed PBTCA on the galena surface while it was impossible to substitute that on the sphalerite surface, which rendered sphalerite surface hydrophilic and enlarged the floatability difference. XPS analysis manifested that PBTCA was adsorbed on sphalerite surface through the strong complexation between carboxyl, phosphonic acid groups and Zn sites on sphalerite surface, forming C-O-Zn or P-O-Zn bond.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yilin Wu,Jian Lu,Wendong Xing,Faguang Ma,Jia Gao,Xinyu Lin,Chao Yu,Ming Yan
Extensive efforts have been made for research on the development of selective separation membranes, however, the simultaneous promotion of stable selectivity and high permselectivity still faces its challenges. For the first time, a subversive synthesis strategy with hierarchical structure was proposed for the preparation of double-layer-based molecularly imprinted nanocomposite membranes (DLMIMs). Herein, the polydopamine (PDA) based imprinting process was initially performed on the surfaces of SiO 2 and activated carbon nanoparticles (ACNPs) to obtain the first PDA-based tetracycline (TC) imprinted layers. After a phase inversion process, a sol-gel polymerization procedure was then conducted for the preparation of second TC-imprinted layers. The TC-imprinted PDA-ACNPs/SiO 2 -based nanocomposite could be applied as the imprinting-initiated factors during the sol-gel TC-imprinted process, which led to the formation of imitated core-shell structure in the as-prepared blended membranes. Importantly, attributing to the as-synthesized double-layer-based TC-imprinted multilevel domains, abundant TC-recognition sites with high stability could be successfully synthesized in DLMIMs. Therefore, it was no surprise that large rebinding capacity (115.5 mg g −1 ), fast adsorption kinetics and high permselectivity coefficients (more than 6.5) were successfully achieved. The results of optimization experiments showed that the PDA-based TC-imprinted layer and sol-gel-based TC-imprinted layer would both cause for largely enhancing the rebinding capacity of DLMIMs. In addition, DLMIMs were synthesized without complicated procedures and the whole preparation process was feasible and pollution-free. Finally, we believed that the as-designed synthetic technique of DLMIMs would hold great potential in selective separation field.
研究领域:
材料科学
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环境工程
·
生物技术
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Yilin Wu,Wendong Xing,Minjia Meng,Jian Lu,Faguang Ma,Jia Gao,Xinyu Lin,Chao Yu
Development of membrane-associated molecularly imprinted materials with fast and high permselectivity has been significant needed in separation engineering field. Herein, for the first time, a subversive synthesis strategy with hierarchical structure was proposed for the preparation of nanocomposite blended molecularly imprinted membranes (NBMIMs). Artemisinin, the high-efficiency antimalarial drug, was chosen as the template molecule. Instead of the direct modification of nanocomposite on membrane surfaces , the double-bonded TiO 2 @PDA was initially prepared, the blended membrane synthesis procedure was then conducted through a phase conversion process by using the as-prepared TiO 2 @PDA and PVDF powder as host materials. Importantly, the double-bonded TiO 2 @PDA-based nanocomposite in blended membranes was first proposed and applied as imprinting-initiated factor during the next artemisinin-imprinted process, leading the formation of imitated core-shell structure on membrane surfaces. It was no surprise that more excellent rebinding capacity (66.9 mg g −1 ), fast adsorption kinetics and high permselectivity coefficients (more than 17) were successfully achieved. Furthermore, an important conclusion was also obtained that TiO 2 @PDA-based nanocomposite from NBMIMs would cause significant enhancement of the rebinding capacity, that is to say, more and more artemisinin-imprinted sites would be synthesized by increasing the dosage of TiO 2 @PDA until 0.5 g. Therefore, a novel direction for the design and manipulation of MIMs materials had been successfully designed and guided for selective separation of artemisinin.
研究领域:
分离工程
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材料科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·1874-1885
·
IF 1.637
Wang Hongpeng,Lin Yuecheng,Li Yin,Dolgormaa Anudari,Fang Hui,Guo Lin,Huang Jun,Yang Junxing
To improve the adsorption capacity of Cd(II) ions, Cd(II) ions were imprinted on the surface of aminoethyl chitosan (AECS), which was coated on Fe 3 O 4 @SiO 2 nanoparticles. A novel magnetic Cd(II) ion-imprinted polymer (Cd(II)-IIP) was synthesized, characterized, and applied to the selective separation of Cd(II) ions from aqueous solution. The adsorption–desorption properties and selectivity of Cd(II)-IIP and a non-imprinted polymer (Cd(II)-NIP) were investigated. The optimum pH and equilibrium binding time were established at pH 6.0 and 60 min, respectively. Kinetics studies demonstrated that the adsorption process proceeded according to a pseudo-first or second order model, while the adsorption isotherms agreed with the Langmuir model. The maximum adsorption capacities of Cd(II)-IIP and Cd(II)-NIP toward Cd(II) ions, as calculated by the Langmuir equation, at pH 6.0 and 25 °C were 26.1 and 6.7 mg/g, respectively. The imprinted polymer showed higher selectivity toward Cd(II) ions compared to the non-imprinted polymer. The relative selectivity factor ( β r ) values of Cd(II)/Cu(II), Cd(II)/Cr(II), and Cd(II)/Pb(II) were 3.315, 3.875, and 2.061, respectively. In addition, Cd(II) ions adsorbed on the Cd(II)-IIP adsorbent could be easily released using 0.1 M HNO 3 , thus showing good material stability and reusability. The adsorption capacity of Cd(II)-IIP was retained at 74% after undergoing six adsorption–desorption cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 32
·13534-13541
·
IF 3.288
Xin Gao,Qiang Ma,Zhengwei Jin,Pei Nian,Zheng Wang
Surfactant-stabilized oil–water emulsions are especially difficult pollutants to eliminate. Membrane technology has been extensively applied for oily water treatment. However, the immutable wettability limits its application for separating different types of emulsions. In this work, novel zeolitic imidazolate framework-8 (ZIF-8) film-coated stainless-steel meshes with switchable superlyophobicity were fabricated for all types of emulsion separations. The membranes exhibited outstanding superoleophobicity (161°) and superhydrophobicity (153°). By switching the superlyophobicity through a prewetting process, the membrane could selectively remove oil droplets in surfactant-stabilized oil-in-water emulsions via superoleophobicity and water droplets in surfactant-stabilized water-in-oil emulsions via superhydrophobicity. Upon further modification of the membrane with polyvinyl alcohol, high-flux emulsion separations were achieved. This work provides a foundation for the development of metal–organic framework (MOF) membranes for selective high-flux emulsion separations.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Xinying Zheng,Yang Qin,Xiaobing Meng,Zhengyu Jin,Liuping Fan,Jinpeng Wang
In this work, we for the first time synthesized the polyethylene glycol (PEG) bonded silica gel via KH-560 as a silane coupling reagent for column chromatography by a solid/liquid surface continuous reaction method. The molecular interaction, structure, morphology, and thermostability was characterized by fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), scanning electronic microscope (SEM) and thermogravimetric analysis (TGA). Given that PEG is capable to self-assemble with α-CD, the PEG bonded silica gel was used as packing of column chromatography to achieve the selective separation of α-cyclodextrin (α-CD) at room temperature and atmospheric pressure. The bonded silica gel column could realize the effective separation of α-CD in the enzymatic hydrolysis mixture, which provides support for industrial separation of α-CD.
研究领域:
化学
·
材料科学
·
分离技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jian Lu,Yingying Qin,Chao Yu,Xinyu Lin,Minjia Meng,Yongsheng Yan,Hougang Fan,Yilin Wu,Chunxiang Li
Pd (II) from release-unbridled electroplating wastewater is causing great challenges, which is unfavourable either to human health or resource reutilization. Ion-imprinted membranes (IIMs) have recently drawn attentions for selective separation of specific ions from analogues. In this context, we have developed a facile strategy for fabrication of Pd (II)-imprinted membranes (Pd-IIMs) for the selective separation of Pd (II). The enhanced flux was obtained by three-dimensional macroporous structure on polydimethylsiloxane (PDMS). Then the Pd-IIMs were synthesized by a modification-imprinting strategy based on PDMS substrates. With the existence of Co (II), Cu (II), Cd (II) and Ni (II), the as-obtained Pd-IIMs showed superior adsorptive selectivity (3.32–5.06) and perm-selectivity (2.34–4.04) towards Pd (II), as well as the satisfactory regeneration performance (more than 92% of the initial rebinding capacities after 5 cycles of adsorption/desorption). Moreover, the as-prepared Pd-IIMs also displayed stability on separation factors even under ultrasonic treatment. Notably, the overused Pd-IIMs after applications for selective separation of Pd (II) showed a satisfactory performance for the treatment of methylene blue (99.87%), which displayed potentials for the “further applications”. The Pd-IIMs and preparation strategy developed in this work have shown a positive opportunity for the efficient treatment of electroplating wastewater and organic dyes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Yun Wang,Zexing Gu,Jijun Yang,Jiali Liao,Yuanyou Yang,Ning Liu,Jun Tang
A novel solid-phase extractant, amidoxime-grafted multiwalled carbon nanotubes (AO-g-MWCNTs), has been synthesized using plasma techniques to selectively separate uranium from nuclear industrial effluents. The adsorbent was characterized by Fourier transform infrared spectra (FT-IR), elemental analysis, Raman, scanning electron microscopy (SEM), and thermal gravity analysis (TGA). Sorption behaviors of uranium(VI) on AO-g-MWCNTs were investigated by varying pH, contact time, initial uranium concentration, and temperature. An optimum sorption capacity of 145 mg g −1 (0.61 mmol g −1 ) for U(VI) was obtained at pH 4.5. X-ray photoelectron spectroscopy (XPS) has been used to explore the sorption mechanism of U(VI) on AO-g-MWCNTs. Furthermore, AO-g-MWCNTs could selectively adsorb U(VI) in aqueous solution containing co-existing ions (Mn 2+ , Co 2+ , Ni 2+ , Zn 2+ , Sr 2+ , Ba 2+ and Cs + ). This study shows that AO-g-MWCNTs are potential adsorbent for effective removal of U(VI) from aqueous solution.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Chenglong Shi,Yongzhong Jia,Jiang Xiao,Xingquan Wang,Ying Yao,Yan Jing
In this paper, a novel liquid-liquid extraction system was investigated for the selective separation of lithium isotopes using ionic liquid (IL) and dichloroethane as extraction solvent and dibenzo-14-crown-4 (DB14C4) as extractant. Results showed that the separation performance of DB14C4 has been improved after the ILs were involved in the extraction process. The maximum single stage separation factor α for 6 Li/ 7 Li obtained in the present study was 1.021. The light lithium isotope 6 Li and the heavy lithium isotope 7 Li were concentrated in organic phase and solution phase, respectively. The order of the single stage separation factor obtained in different lithium salts was LiI > LiBr > LiClO 4 > LiCl. From the temperature dependence data, the thermodynamic functions values of the lithium isotope exchange reaction were calculated.
研究领域:
化学工程
·
核化学与放射化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yan Zhang,Peixin Zhang,Weikang Yu,Jun Wang,Qiang Deng,Jiangfeng Yang,Zheling Zeng,Mai Xu,Shuguang Deng
It is very challenging to prepare biomass-derived porous carbons with well-confined ultramicropores. Traditionally, biomass-derived carbons, via a chemical activation process, possess wide pore size distributions from micropores to macropores. Outstanding BET surface area of 2676 ± 107 m2 g–1 was obtained with excellent CO2 uptake of 6.15 and 2.26 mmol g–1 under 1 and 0.15 bar at 273 K. Furthermore, the outstanding CO2/N2, CO2/CH4, and CH4/N2 selectivities of 43.5, 7.4, and 5.9 were obtained on an OTS-1-550 at 298 K and 1 bar. The pore size effect on CO2 capture and gas-separation performance was carefully investigated, indicating that the ultramicropores (<1 nm) governed the CO2 adsorption capacity at 1 bar. Also, the vacuum swing adsorption (VSA) processes and breakthrough experiments have confirmed their practical application potential.
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
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Fusheng Pan,He Ding,Weidong Li,Yimeng Song,Hao Yang,Hong Wu,Zhongyi Jiang,Baoyi Wang,Xingzhong Cao
Constructing facilitated transport pathways using two-dimensional (2D) nanosheets as building blocks is an emerging approach to achieving highly selective passage of small molecules with similar physical properties. Due to high chemical inertness and low structural defects, molybdenum disulfide (MoS 2 ) 2D nanosheets hold great promise in a broad range of molecular separation applications. In this study, MoS 2 nanosheets were incorporated in Pebax matrix to remove thiophene from the n-octane-thiophene mixture. The moderate binding energy of thiophene on the basal plane of MoS 2 enabled the construction of continuous facilitated transport pathways on the MoS 2 nanosheet for rapid diffusion of thiophene molecules. When the content of MoS 2 in the hybrid membrane was 4 wt%, the membrane displayed an optimum desulfurization performance with a permeation flux of 11.42 kg/ (m 2 h) (22.27% higher than that of Pebax membrane) and an enrichment factor of 9.11 (65.94% higher than that of Pebax membrane) at 60 °C with a feed solution containing 1312 ppm thiophene. This study is the first attempt of using MoS 2 nanosheets in pervaporative separations of small molecules liquid mixture, which may open a novel avenue to constructing facilitated transport pathway within membranes for efficient molecular sieving.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Huanyu Zhu,Bingqiao Yang,Jinchan Feng,Feifei Jia
In this work, an environment-friendly sphalerite depressant 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) was exploited in the flotation separation of sphalerite and galena . The flotation performances of sphalerite and galena treated by HEDP were investigated by mineral flotation tests. The depression mechanisms of HEDP on sphalerite were investigated by various characterization techniques such as zeta potential tests, Fourier Transform Infrared Spectrometer (FTIR), X-ray Photoelectron Spectroscopy (XPS) analysis, Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and density functional theory (DFT) calculation. Flotation tests showed that HEDP selectively depressed sphalerite but almost did not influence the flotation of galena in sodium isobutyl xanthate (SIBX) system, which achieved effective flotation separation results. zeta potential tests and FTIR results proved the preferential adsorption of HEDP on sphalerite surface, but the pre-adsorbed of HEDP on galena could be replaced by SIBX easily. XPS, ToF-SIMS analysis and DFT calculation demonstrated that HEDP was coordinated with Zn atom through two different phosphonic acid group, forming a six membered chelating ring.
研究领域:
矿物加工工程
·
环境科学
·
材料化学
✓ 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）