SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Jingyu Zhang,Yicheng Jiang,Yafei Xu,Qingfeng Zhai,Chenyang Luo,Qiang Zhang
The efficient removal of organic pollutants from wastewater with diverse compositions remains a significant challenge due to the inherent limitations of traditional advanced oxidation processes (AOPs). Radical-dominated pathways are often inhibited by water matrix components, whereas nonradical pathways, although more selective and tolerant, exhibit slower reaction rates. Herein, we developed a photo-responsive Fe–B@C catalyst that enables dynamic regulation of reactive oxygen species (ROS) pathways through light irradiation, effectively acting as a switch between nonradical and radical-nonradical synergistic mechanisms. Under dark conditions, the system predominantly generates singlet oxygen ( 1 O 2 ), maintaining high stability against inorganic salts, humic acids, and broad pH variations. Upon illumination, the catalyst switches to a synergistic pathway involving 1 O 2 , hydroxyl radicals (•OH), and sulfate radicals (SO 4 − •), achieving near-complete tetracycline removal and enhanced mineralization. Mechanistic studies reveal that boron facilitates the Fe 3+ /Fe 2+ redox cycle and promotes ROS generation, while light precisely controls the activation mode. This work demonstrates a smart catalyst design strategy, allowing AOPs to adapt to varying wastewater compositions, offering a promising solution for tailored and high-efficiency water treatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 4
·1959-1966
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IF 3.288
Wei Ji,Wenmei Ao,Mengqiu Sun,Chunlai Feng,Yun Wang
The aim of the present work was to develop a novel method integrating two-step aqueous two-phase extraction and temperature-controlled affinity precipitation for the separation and purification of horseradish peroxidase (HRP) from horseradish roots. First, a two-step aqueous two-phase extraction (ATPE) process was used as a primary separation process to remove sugars and pigments, and then a temperature-controlled affinity precipitation process based on a thermosensitive triblock copolymer (PEG113-b-PVBA49-b-PNIPAM105) was exploited as a further purification process to selectively isolate HRP from other impurity proteins. The optimum PEG4000 (0.20, w/w) − (NH4)2SO4 (0.18, w/w) aqueous two-phase system (ATPS) was obtained by studying the liquid–liquid equilibrium of PEG (400/1000/2000/4000) + (NH4)2SO4/K3C6H5O7/K2HPO4 ATPSs and the distribution behaviors of 9 kinds of model compounds in these PEG-salt ATPSs. The successful isolation of HRP from horseradish roots was achieved by the integrated method without having a negative effect on the structure of HRP, and the extraction efficiency and purification factor of HRP reached 84.26 ± 0.15% and 9.15 ± 0.10, respectively. The integrated method shows outstanding separation and purification performances and has good prospects for the industrial production of plant glycoprotein.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Guangli He,Yunhe Lai,Yanzhen Guo,Hang Yin,Binbin Chang,Man Liu,Shouren Zhang,Baocheng Yang,Jianfang Wang
Designing plasmonic photocatalysts with spatially controlled catalytic sites is an effective strategy to boost the sunlight-driven chemical transformation efficiency through plasmonic enhancement. Herein, we describe a facile method for the synthesis of TiO2-tipped Au nanobipyramids (NBPs) to give (Au NBP)/t-TiO2 nanodumbbells. The surfactant cetyltrimethylammonium bromide concentration is the key factor in the construction of this type of unique nanostructure. The photocatalytic aerobic oxidative coupling of amines using the plasmonic photocatalysts with the dumbbell-like and core@shell structures indicates that the TiO2-tipped ends for the photo-reduction and the exposed adjacent Au surface for the photo-oxidation on (Au NBP)/t-TiO2 can significantly improve the photocatalytic activity. The underlying mechanism of the photocatalytic oxidative coupling of benzylamine over (Au NBP)/t-TiO2 has been thoroughly investigated. Both experimental and simulation results for (Au NBP)/t-TiO2 and (Au nanorod)/t-TiO2 confirm the important effect of the plasmonic hotspots on the enhancement of the photocatalytic activity.
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高影响因子
ACS Omega
·
2021
·
IF 3.512
Xue Zhang,Juan Du,Dongping Wu,Xiaoyi Long,Dan Wang,Jianhua Xiong,Wanming Xiong,Xiaoning Liao
Carbendazim, a very common contamination to the traditional Chinese medicines (TCMs), has posed serious threat to the environment and human health. However, sensitive and selective detection of carbendazim (MBC) in the TCMs is a big challenge for their complex chemical constituents. In this work, a 0D/1D nanohybrid was developed by anchoring 1T-phased MoS2 quantum dots (QDs) over multiwall carbon nanotubes (MWCNTs) via a facile assembly method. High-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA) together with EIS reveal that the 1T-phased QDs can anchor over MWCNTs via van der Waals forces, and the anchoring improves the nanohybrid surface area and conductivity. Therefore, the electrochemical sensor fabricated based on the MoS2 QDs@MWCNT nanohybrid shows excellent catalytic activity to MBC oxidation. Under optimized conditions, the sensor presents a linear voltammetry response to MBC concentration from 0.04 to 1.00 μmol·L–1, a low detection limit of 2.6 × 10–8 mol·L–1, as well as high selectivity, good reproducibility, and long-term stability. Moreover, the sensor has been successfully employed to determine MBC in two typical TCMs and the obtained recoveries are in good accordance with the results achieved by HPLC, showing that the constructed sensor plate holds great practical application in MBC analysis with complex matrix.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3618
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IF 4.6
Wanting Cheng,Feng Xian,Zhanluo Zhou,Kun Hu,Jing Gao
Ionic liquids (ILs) have arisen as alternatives to organic solvents and been used in natural pigment extraction in recent decades. However, the solubility and stability of carotenoids in phosphonium- and ammonium-based ILs are insufficiently explored. In this work, the physicochemical properties of the ILs, and the dissolution behavior and storage stability of three carotenoids (astaxanthin, β-carotene, and lutein) in the IL aqueous solution were investigated. The results showed that the solubility of the carotenoids in the acidic IL solution is higher than that in the alkaline IL solution, and the optimal pH is about 6. The solubility of astaxanthin (40 mg/100 g), β-carotene (105 mg/100 g), and lutein (5250 mg/100 g) was the highest in tributyloctylphosphonium chloride ([P4448]Cl) due to the van der Waals forces with [P4448]+and hydrogen bonding with Cl−. A high temperature was beneficial to improve the solubility, but it can reduce the storage stability. Water has no significant effect on the carotenoid stability, but a high water content decreases the carotenoid solubility. A IL water content of 10–20%, an extraction temperature of 338.15 K, and a storage temperature of less than 298.15 K are beneficial for reducing the IL viscosity, improving carotenoid solubility, and maintaining good stability. Moreover, a linear correlation was found between the color parameters and carotenoid contents. This study provides some guidance for screening suitable solvents for carotenoid extraction and storage.Keywords:ionic liquid;carotenoid;physicochemical property;solubility;stability
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Xinyu Chen,Jinjin Liu,Zheng Tang,Shuangquan Liu,Jiayi Peng,Hao Liang,Xiangheng Niu
With their important role in regulating intracellular redox balance and maintaining cell homeostasis, endogenous mercaptans are recognized as biomarkers of many diseases in clinical practice, and thus establishing efficient yet simple methods to distinguish and quantify endogenous mercaptans is of great significance for health management. Here, we propose a machine learning-enabled time-resolved nanozyme-encoded strategy to identify endogenous mercaptans in the presence of potential interferents for disease diagnosis. Diethylenetriaminepenta(methylenephosphonic) acid was first employed to coordinate with Mn3+ to prepare a new amorphous nanozyme, which exhibited excellent oxidase-like activity in catalyzing the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine to its blue oxide. The addition of endogenous mercaptans (cysteine, homocysteine, and glutathione) could competitively suppress the chromogenic process to different extents due to their discrepant antioxidant abilities, providing specific fingerprints over time for each species. With this mechanism, a time-resolved sensor array with the nanozyme as a sole sensing unit was constructed to accurately identify different types and levels of mercaptans and their various mixtures with the help of pattern recognition. Furthermore, machine learning was combined with the sensor array to construct a stepwise prediction model consisting of concentration-independent classification and concentration-associated regression, which could not only differentiate cancer cells from normal ones based on intracellular glutathione but also evaluate the severity of cardiovascular diseases according to serum homocysteine, showing great application potential in disease diagnosis.
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高影响因子
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