ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Jiali Chen,Peng Gao,Jie Liu,Yimin Zhu
Scheelite and calcite was firstly separated by new depressant Poly(sodium 4-styrenesulfonate) (PSS) with NaOL system. The recovery of scheelite was 87.18 % and the recovery of calcite was 5.57 % in single flotation experiments, the recovery and grade of WO 3 was 70.53 % and 61.08 % respectively in artificial mixed ore flotation under the optimal conditions of 10 mg/L NaOL, 10 mg/L PSS and pH of 8. Contact angle measurements, atomic force microscope (AFM) analysis, zeta potential analysis, fourier transforming infrared spectra (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) analysis were performed to uncover the reaction mechanism. The results showed that PSS could not adsorbed on scheelite by chemical reaction, and PSS had no impact on the further adsorption of NaOL onto the scheelite surface. Therefore, scheelite could still keep a high recovery with PSS. However, PSS could be strongly adsorbed on calcite by chemisorption between the Ca site of calcite and O site of PSS, which increased the hydrophilia of calcite and imped the further adsorption of NaOL. Therefore, it could selectively depress the flotation of calcite.
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Lin Jiuyang,Yu Zijian,Chen Tianci,Huang Junming,Chen Lianxin,Li Jiangjing,Li Xuewei,Huang Xiaolei,Luo Jianquan,Ang Elisa Yun Mei,Toh William,Wang Peng Cheng,Ng Teng Yong,Seo Dong Han,Zhao Shuaifei,Zhong Kuo,Xie Ming,Ye Wenyuan,Van der Bruggen Bart,Wan Yinhua
During the synthesis of dyes, desalination of high-salinity dye-containing waste liquor is a critical premise for high-quality, clean dye production. Conventional membrane processes, such as electrodialysis, nanofiltration and ultrafiltration, are inevitably subjected to serious membrane fouling, deteriorating the dye/salt fractionation efficacy. Integrating the technical merits of electrodialysis and pressure-driven membrane separation, we devise an electro-driven filtration process using a tight ultrafiltration membrane as alternative to conventional anion exchange membrane for rapid anion transfer, in view of dye desalination and purification. By employing a sub-4 nanometer tight ultrafiltration membrane as anion conducting membrane, the electro-driven filtration process achieves 98.15% desalination efficiency and 99.66% dye recovery for one-step fractionation of reactive dye and NaCl salt, markedly outperforming the system using commercial anion exchange membranes. Notably, the electro-driven filtration system displays a consistently high and stable fractionation performance for dyes and salts with unprecedentedly low membrane fouling through an eight-cycle continuous operation. Our results demonstrate that the electro-driven filtration process using nanoporous membranes as high-performance anion conducting membranes shows a critical potential in fractionation of organic dyes and inorganic salts, unlocking the proof of concept of nanoporous membranes in electro-driven application.
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产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2023
·
IF 4.4
Shuai Fu,Yuhui Ma,Zhiyuan Zhang,Yao Xu,Heyi Zhang,Zihan Xiao,Sihao Zhang,Ruidong Xia
A high-quality perovskite film is of great significance for efficient and stable perovskite solar cells (PSCs). The use of additives to improve the crystallinity and morphology of perovskite films is an effective way to improve the performance of PSC devices. In this work, 4-carboxyphenyl isothiocyanate (CPIC) was used as an additive in perovskite films to improve the quality of the films. The results of FT-IR showed that the SCN - and -COOH groups with Lewis base in CPIC can coordinate with unpaired Pb 2+ on the perovskite films to form Lewis acid-base adducts. The addition of CPIC can effectively improve the crystallinity and grain size of the perovskite films. The results showed that the short circuit current density ( J SC ) and fill factor (FF) of PSC devices increase significantly with the improvement of film quality, when the concentration of CPIC is 0.5 mg mL −1 . These made the efficiency of the devices increase from 16.16 % to 18.19 %. Meanwhile, the introduction of the benzene ring in CPIC can improve the stability of the PSC devices. After aging at room temperature and 50 % humidity for 30 days, the device added with CPIC retained 61.9 % of the initial PCE. This work proves that using CPIC as an additive is an effective method to achieve efficient and stable PSCs.
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高影响因子
Green Chemical Engineering
·
2021
·
IF 0
Yunchang Fan,Di Wu,Sheli Zhang,Lei Zhang,Wei Hu,Chunyan Zhu,Xueyun Gong
The hydrophobic ionic liquids/water two-phase system was developed to prepare CuO nano particles. The catalytic activity of the synthesized CuO was investigated by photodegradation of 4-nitrophenol (4-NP) in the presence of H 2 O 2 under visible light irradiation. The optical properties of the synthesized CuO were characterized by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). Experimental results indicated that the band gap energy ( E g ), conduction band edge potential ( E CB ) and valence band edge potential ( E VB ) of the synthesized CuO were 1.37 eV, 0.625 eV and 1.995 eV, respectively. A degradation efficiency of 4-NP (4.8 mmol L −1 ) as high as 95.3% could be achieved under the conditions of pH 6.0, 0.48 g L −1 of CuO dosage, 1.4% of H 2 O 2 dosage and 90 min of degradation time. The synthesized CuO exhibited poor catalytic activity under alkaline conditions due to the disassociation of 4-NP, which elevated the repulsion between CuO and the 4-NP anions. The synthesized CuO nano particles exhibited higher catalytic activity compared with the catalysts reported in literature. Furthermore, the synthesized CuO nano particles could be reused at least six times without decreasing their catalytic activity. Compared with the traditional hydrothermal method, mild operating conditions and time saving are the advantages of the developed method for the preparation of CuO.
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Desalination and Water Treatment
·
2024
·
IF 1
Yiqi Liu,Gang Xue,Yaqian Ma,Lei Ding,Yanli Kong,Yang Gao,Zhonglin Chen
4-Nitrophenol (4-NP) removal using prepared molecular imprinting polymers (MIPs) as a specific adsorbent was investigated. On the basis of single-factor experiment, Box–Behnken statistical experiment design (BBD) and response surface methodology (RSM) were used to investigate the influence of MIPs dosage, initial concentration of 4-NP, pH and temperature of the solution, and their potential interaction effect on 4-NP removal. The quadratic polynomial regression model of response value Y (4-NP removal efficiency) was established based on the BBD experiment al results. The reasonable and reliable of regressive of the model was confirmed by the analysis of variance test and residuals analysis (R 2 = 0.9952). The RSM model indicates that all single-factors had a significant effect on 4-NP removal. The interaction effect between MIPs dosage and temperature, temperature, and pH were not significant but the other four interaction effects were significant. The regression model showed an optimum removal of 79.63%, while 78.39% removal was obtained from batch experiments at the optimum conditions suggested by the regression model, which reconfirmed the validity of the model. The results demonstrated that prepared MIPs possessed a strong adsorption ability for 4-NP removal, allowing a possible practical application in future water treatment.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 37
·期 22
·3268-3275
·
IF 2.594
Zhifen Deng,Junwei Liu,Chenchen Hu,Liu Yang,Huifang Du,Kai Hu,Yanjie Huang,Xiaoqing Yang,Qiong Jiang,Shusheng Zhang
Two new kinds of alanine-substituted calix[4]arene stationary phases of 5,11,17,23- p-tert- butyl-25,27-bis( l -alanine-methylester- N -carbonyl-methoxy)-26,28-dihyroxycalix[4]arene-bonded silica gel stationary phase (BABS4) and 5, 11, 17, 23- p-tert -butyl-25,26,27,28-tetra( l -alanine-methylester- N -carbonyl-methoxy)-calix[4]arene-bonded silica gel stationary phase (TABS4) were prepared and characterized in the present study. They were compared with each other and investigated in terms of their chromatographic performance by using polycyclic aromatic hydrocarbons, disubstituted benzene isomers, and mono-substituted benzenes as solute probes. The results indicated that both BABS4 and TABS4 exhibited multiple interactions with analytes. In addition, the commonly used Tanaka characterization protocol for the evaluation of commercially available stationary phases was applied to evaluate the properties of these two new functionalized calixarene stationary phases. The Tanaka test results were compared with Zorbax Eclipse XDB C 18 and Kromasil phenyl columns, respectively. BABS4 has stronger hydrogen-bonding capacity and ion-exchange capacity than TABS4, and features weaker hydrophobicity and hydrophobic selectivity. Both of them behave similarly in stereoselectivity. Both BABS4 and TABS4 are weaker than C 18 and phenyl stationary phases in hydrophobicity and hydrophobic selectivity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bing Wang,Yao Liu,Zhuo Li,Hong Hao,YuZhen Zhao,ZeMin He,WenQi Song,EnZhou Liu,Bo Zhou,XiaoXun Ma,Zongcheng Miao
Leveraging the synergistic combination of dipole modulation and localized surface plasmon resonance effects (LSPR) effects offers a promising solution to address the low carrier separation efficiency observed at traditional Type-III heterojunction interfaces. Herein, a derivative of SubPc-4 with a high dipole moment of 7.25 Debye was successfully synthesized by introducing carbonyl functional groups axially into the parent subphthalocyanine. Silver metal was introduced during the preparation of Ag 3 PO 4 through light irradiation, and the organic supramolecule SubPc-4 self-assembled on the Ag 3 PO 4 semiconductor surface via van der Waals forces and π-π stacking interactions, forming a binary heterojunction SubPc-4/Ag 3 PO 4 with LSPR effects. Under 30 minutes of visible light irradiation, the degradation efficiencies of tetracycline and oxytetracycline by the SubPc-4/Ag 3 PO 4 supramolecular nanoarray were 88.29% and 90.20%, respectively. DFT and TDDFT calculations, combined with experimental characterization data, indicate that the LSPR supramolecular array exhibits excellent activity and stability, primarily attributed to the improved carrier separation capability at the SubPc-4/Ag 3 PO 4 interface. This work highlights the potential of combining dipole modulation and LSPR technology to enhance the performance of Type-III heterojunction photocatalysts.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Yan-Ling Liu,Xian-Chen He,Jie Gao,Ke-Rong Li,Kai Chen,Hao-Yue Xiang,Hua Yang
Herein, visible light-induced, nickel-catalyzed direct functionalization of the Hantzsch esters (HEs) with readily accessible alkyl bromides has been successfully achieved by taking advantage of HE as the reductant and substrate through an aromatization-dearomatization process. In this strategy, the single electron reduction of alkyl bromides by reactive Ni(I) species is essential for the success of this late-stage transformation. A wide range of 4-alkyl-1,4-dihydropyridines were rapidly assembled in moderate to good yields under mild conditions, rendering this photoinduced approach attractive for synthetic and medicinal chemistry.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 7
·1149-1155
·
IF 2.737
Ganghui Chu,Wensheng Cai,Xueguang Shao
To extract flavone glycosides efficiently, a new extraction material based on 4-butylaniline-bonded silica gel was prepared using a two-step grafting method including a ring-opening reaction and synchronous hydrolysis. Preparation of the silica-based material was easily achieved under mild conditions, and the material was characterized by Fourier transform infrared spectroscopy, elemental analysis, and scanning electron microscopy. The material was used in solid-phase extraction, and the extraction can be performed in neutral conditions without regard to ionic strength. Selectivity tests of 14 compounds on the extraction cartridge showed that the material has a high affinity to flavone glycosides in contrast to octadecyl silica, and the extraction yields for four flavone glycosides were found to be >93%. Selectivity tests further reveal that the adsorption on its surface is likely attributed to multiple interactions, including hydrophobic interactions, π–π interactions, and hydrogen bonding. To explore the applicability of 4-butylaniline-bonded silica gel, naringin and hesperidin from Simotang oral liquid were extracted, and the extraction yields were >90%, which is distinguished from <28% on octadecyl silica cartridge.
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高影响因子
Heliyon
·
2024
·
IF 3.4
Chenhan Lv,Haixiang Cheng,Rui Fan,Jingyu Sun,Xinghai Liu,Yinghui Ji
Organic fluorine compounds are acute carcinogenic and mutagenic to humans. Photoelectrocatalysis (PEC) treatment is an innovative technology in the field of the removal of fluorine compounds, and thus current research focused on improving stability and catalytic ability of photoanode. In this study, it has been synthesized a rGO/BiOI photocathode for the efficient degradation of 4-Fluoroaniline (4-FA). The physical characterization and photoelectrochemical properties of the photocathode was determined. The results indicate that the PEC treatment with the rGO/BiOI photocathode was more efficient compared with individual processes. During the optimization experiments, the PEC treatment achieved 99.58 % and 72.12 % of 4-FA degradation and defluorination within 1 h. Cyclic stability experiments show that rGO/BiOI photocathode was efficient and stable, which reached 96.91 % and 67.64 % of 4-FA degradation and defluorination after five cycles. Mechanism analysis indicates that the PEC process was based on an electrochemical reaction and photo-induced processes. The degradation product of 4-FA was mainly 2,4-di-t-butylphenol, and trapping experiments indicates that h + is the primary oxidizing species. Therefore, PEC treatment with rGO/BiOI photocathode is a competitive green approach to remove fluorine compounds pollutants and brings new insights into development of PEC treatment.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Jun Chen,Shuanghong Tian,Jiang Lu,Ya Xiong
This study aims to provide a direction to tailor catalytic activity of catalyst by selectively exposing a crystal facet. Herein three sheet-like MgO materials with the primarily exposed crystal facet of (1 1 1), (1 1 0), (2 0 0) were prepared, respectively. Results show that the catalytic ozonation on each MgO substantially enhanced the removal of 4-chlorophenol and total organic carbon when compared with ozonation alone or that on traditional MgO. The pseudo first-order reaction constant of 4-chlorophenol removal in ozonation catalyzed by MgO(1 1 1), MgO(1 1 0), MgO(2 0 0) is 4.8, 2.5, 3.1 times higher than that in the single ozonation, respectively. When different dosage but the same surface area of MgO was applied, their catalytic activities changed as MgO(1 1 1) > MgO(1 1 0) > MgO(2 0 0). It indicates that the catalytic activity significantly depends on the crystal facet besides the surface area. That is because the drawbacks, such as edges, steps, and kinks, on each facet decreased in the order of (1 1 1) > (1 1 0) > (2 0 0). CO 2 -TPD and zeta potential measurement show that the drawbacks caused more and stronger surface basic groups in the form of hydroxyl and isolated oxygen due to the availability of more unsaturated coordination sites. These active basic centers make the easy formation of basic microenvironment near MgO particles and thus favor the ozonation. Finally, the catalytic mechanism was explored and compared by evaluating the ozone decomposition, qualitatively and quantitatively identifying hydroxyl radicals, and determining the ozone utilization efficiency. It reveals that MgO with more surface basic groups can enhance the transformation rate of ozone to hydroxyl radicals more efficiently. All these results show that MgO is a very potential ozonation catalyst and the catalytic activity can be tailored by exposing crystal facet with more drawbacks.
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高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2017
·Vol. 49
·期 3
·520-525
·
IF 2.969
Yun Ling,Wen-Chang Xie,Wei-Li Wang,Meng-Kai Li,Jing Tang,Guo-Kun Liu,Run-Wen Yan,De-Yin Wu
Taking the fingerprint characteristics of Raman spectroscopy, the dimerization of p-nitrothiophenol (PNTP) to 4-nitrophenyl disulfide in air was investigated, which could be accelerated by the external laser illumination. The dimerization was qualitatively confirmed by both mass spectroscopy experimentally and by Raman spectrum simulated calculations theoretically and quantitatively analyzed by Raman spectroscopy in a simple and quick manner. On the basis of the inductively coupled plasma optical mass spectrometry analysis, the dimerization was possibly ignited by the trace metal residues as catalyst in the PNTP. This study clearly shows that it is very important to strictly and preciously control the experimental conditions of Raman measurement and other laser-based spectroscopies to avoid any wrong conclusion during the characterization or identification. Different to the plasmon-induced photochemical reactions, we reported the photochemical reaction of PNTP to 4-nitrophenyl disulfide, which is free of the plasmoic effect from the metal nanostrucutres. On the other hand, the photochemical dimerization reaction may provide a new and important guideline for the formation of thiols to disulfides.
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高影响因子
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