CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhuofan Huang,Qintie Lin,Haoyu Luo,Pengran Guo,Qingsong Weng,Yongqian Lei,Shuailong Cheng,Shuang-Shuang Liu
Progesterone (PGT), a widely used progestogen, has become a refractory pollutant present in urban runoff. The removal of PGT in wastewater is urgent owing to its endocrine disruption. In this study, a nano-CuO loaded halloysite nanotube (CuO/HNTs) was prepared by a simple hydrothermal method, which could be used as a catalyst to activate persulfate (PS) for the degradation of PGT. The characterizations showed that the nano-CuO was uniformly loaded on the HNTs to form corn-like structures with a large specific surface area. The optimal PGT degradation efficiency (100%) was achieved with the addition of 0.5 g/L catalyst and 7 mM PS. The effects of pH, HCO 3 – and Cl - on the catalytic activity of the CuO/HNTs-PS system were investigated. The results showed that 1) pH had little effect due to the buffer effect of Al 2 O 3 in HNTs, and nearly neutral solutions were obtained after reaction even in strong acidic or alkaline conditions, 2) low concentrations of HCO 3 – and Cl - had almost no impact on PGT degradation. Furthermore, the degradation mechanism was explored by quenching reactions, XPS, EPR studies and electrochemical experiments. The results demonstrated that the reaction was divided into the free radical pathway (SO 4 •- and •OH generation by the mutual transformation of PS, Cu(I), Cu(II), and Cu(III)) and the nonradical pathway (electron transfer process from the organic pollutant to the CuO/HNTs). In addition, the byproducts of PGT in the process were determined by LC-MS, and the possible transformation pathways were proposed. The CuO/HNTs-PS system might provide some new insights for the remediation of wastewaters.
研究领域:
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jiawei Lin,Yongyou Hu,Luxiang Wang,Donghui Liang,Xian Ruan,Sicheng Shao
In this study, we synthesized a typical iron-based metal-organic framework, MIL-88B (Fe), and constructed a MIL-88B (Fe)/persulfate/visible light (M88/PS/Vis) system for photocatalytic degradation of bisphenol A (BPA) in aqueous solution. The removal efficiency, environmental factors, and degradation mechanism and pathways were explored. The results showed that there were synergistic effects in the M88/PS/Vis system: BPA (10 mg/L) could be removed completely within 25 min with 0.6 g/L M88 and 2 mM PS under visible light, while the removal rates with individual M88/Vis or M88/PS was only 26.0% and 34.1%, respectively. In addition, the BPA degradation rate in the M88/PS/Vis system (0.107 min −1 ) was 4.7 times higher than that in the M88/PS system (0.023 min −1 ) and 8.9 times higher than that in the M88/Vis system (0.012 min −1 ), respectively. Additionally, environmental factors could strongly impact the degradation of BPA in the studied system in which O 2 − and SO 4 − played a dominant role. More importantly, risk assessment in the BPA/M88/PS/Vis system was, for the first time, estimated in our study via the “ecological structure activity relationships” program at three trophic levels and Cell Counting Kit-8 method. Although there were some intermediates with higher biological toxicity than BPA and increased the toxicity of solution, most intermediates were one or more level less toxic than BPA. In most cases, the toxicity of solutions were lower than the initial samples, which demonstrated the effectiveness of M88/PS/Vis system in the reduction of toxicity of BPA, and the toxicity hazard in general could be effectively avoided by prolonging the duration of light exposure. This research provides a profound understanding of the potential application of PS activation by photocatalyst for both BPA removal and toxicity shift under visible light.
研究领域:
环境科学
·
化学工程
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Feige Wang,Wenjing Wang,Shoujun Yuan,Wei Wang,Zhen-Hu Hu
Thiamphenicol (TAP) has been widely used in aquaculture to prevent bacterial diseases. However, this drug exhibits toxic side effects on the haemopoietic system. The removal of residual TAP in wastewater in advanced oxidation processes (AOPs) was rarely reported before. In this study, degradation of TAP in aqueous solution by UV alone, UV/H 2 O 2 and UV/PS processes was investigated. The results showed that UV/H 2 O 2 and UV/PS significantly enhanced the degradation compared to UV alone. The TAP degradation followed a pseudo-first-order kinetics pattern well. The k obs declined with the increase of the initial TAP concentration, and increased with increasing oxidant dosage. The TAP degradation with UV/H 2 O 2 process was favorable under neutral and acidic conditions, and with UV/PS process was favorable under acidic and alkaline conditions. HCO 3 − markedly inhibited the degradation with the both processes, NO 3 − had a slight inhibition on the degradation in UV/H 2 O 2 system, and Cl − significantly enhanced the degradation with UV/PS process. HA markedly inhibited the degradation with the both processes. SO 4 − played the main role in the TAP degradation by UV/PS process. When TAP was completely degraded, only part of TAP was mineralized with UV/H 2 O 2 process, and was totally mineralized with UV/PS process. The possible degradation pathways were proposed based on the intermediate products obtained by LC-TOF-MS analysis. The electrical energy per order (EE/O) analysis showed that UV/PS process was a less energy consumption process. The results from this study revealed that UV/PS process was a cost-effective process in the degradation of TAP.
研究领域:
环境科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Fa Fang,Nuo Li,Xian Zhang,Juan Liu,Jingzi Beiyuan,Jielong Cao,Jin Wang,Yanyi Liu,Gang Song,Tangfu Xiao
Due to extreme toxicity of the element of thallium (Tl), increasing aqueous Tl pollution incidents have aroused growing concerns. As the prevalent and stable form, i.e. , monovalent Tl, the highly efficient removal methodologies of Tl(I) from (waste)water remains limited and challenging. In this study, an advanced oxidation method, the feasibility of using zero valent iron (Fe 0 ) coupled with persulfate (PS) to treat Tl(I)-containing synthetic wastewater was investigated. Its influence parameters, including reaction time, initial Tl concentration, dosages of PS and Fe 0 , initial and coagulation pH, temperature, coexisting ions and organic matter (NO 3 − , SO 4 2− , Cl − and HA) were examined. The results revealed that the system can be applied to a wide range of pH and temperature and the reaction equilibrium can be reached in about 30 min. Favorable Tl(I) removal rate (>98%) was observed in the synthetic wastewater with medium and relatively high Tl(I) concentration (≤0.250 mM). The analyses of characterization results including electron spin resonance spectrometer and X-ray photoelectron spectroscopy indicated that ·OH played a vital role in the removal of Tl(I), which was oxidized and removed by co-precipitation. Fe 0 can be served as a stable source of Fe 2+ to efficiently catalyze PS. The remaining Fe 0 can be easily separated because of its magnetism, assuring the promising reusability of the reactant. The study aims to provide references for treatment of real Tl polluted wastewater.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Xiao Ling,Minjie Chen,Anhong Cai,Honglei Sun,Shanlin Xu,Lei Wang,Xueyan Li,Jing Deng
The dewaterability of waste-activated sludge (WAS) has been extensively examined using zero-valent iron (ZVI)-based advanced oxidation processes (AOPs). However, the high dosage and low utilization efficiencies of ZVI cast doubt on the dependability and viability of ZVI-based AOPs. In this study, we successfully demonstrated pre-magnetization as an efficient, chemical-free, and ecological method for improving the efficiency of sludge dewatering by ZVI/persulfate (PS) process, in which the reduction ratios of capillary suction time (CST) and specific resistance to filtration (SRF) increased by 8.67% and 11.06% under optimal conditions, respectively. The highly active Fe 2+ released during ZVI corrosion may be more essential than ZVI itself during PS activation, which could be strengthened by pre-magnetization. Both homogeneous and heterogeneous Fe 2+ could react with PS to produce aqueous hydroxyl radicals (∙OH) and sulfate radicals (SO 4 − ∙) as well as surface-bound ∙OH and SO 4 − ∙, further decomposing bound-extracellular polymeric substances fractions, broking hydrophilic functional groups and compounds, altering protein secondary structure to expose more hydrophobic sites, and releasing abundant EPS-bound water. Due to the protection of tightly-bound extracellular polymeric substances (TB-EPS) and the competitive oxidation of organics released during the early disintegration stage, radical oxidation primarily occurs at extracellular levels, releasing a bit of intracellular water. Besides, polysaccharides in TB-EPS may function a more significant role in flocculation than proteins, and a porous structure favorable to drainage will be formed after the pre-magnetized ZVI/PS treatment. The cost-benefit analysis further reveals that the Pre-ZVI/PS process presents high reusability and utilization, making it potential for particle application in sludge dewatering.
研究领域:
环境科学
·
污水处理
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产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Tongyu Chen,Xiaoyue Yang,Zhanxiong Li
2 Spraying rough microspheres on the cotton fabrics' surface is an ingenious way to develop textiles with superhydrophobic properties. This paper reports a convenient and low-cost technique for synthesising hydroxyl-terminated polystyrene by atom transfer radical polymerisation (ATRP) and preparing PS-b-PFPE by introducing perfluorinated polyether chain segments through esterification. Simultaneously, PS-b-PFPE was prepared as a finishing solution, and the PS-b-PFPE microspheres were prepared by electrostatic spraying. The effects of different receiving distances, solvents, concentrations, voltage and flow velocity on the morphology and its size distribution of the spray microsphere were studied. The results show that when chloroform was used as a solvent, the working liquid concentration was 80 mg/mL, the flow rate was 0.8 mL/h, the receiving distance was 10 cm and the voltage was 10 kV, the obtained size distribution of the microspheres was narrow. In addition, the static contact angle of the PS-b-PFPE microspheres coating was 159° ± 1°, and the rolling angle was 1.8° ± 0.3°. Consequently, the PS-b-PFPE-coated cotton fabric had good oil–water separation and self-cleaning function with good mechanical stability.
研究领域:
材料科学
·
纺织工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 12
·4639
·
IF 4.6
Dafeng Liu,Longguang Jiang,Jincan Chen,Zhuo Chen,Cai Yuan,Donghai Lin,Mingdong Huang
Photodynamic therapy (PDT) is recognized as a powerful method to inactivate cells. However, the photosensitizer (PS), a key component of PDT, has suffered from undesired photobleaching. Photobleaching reduces reactive oxygen species (ROS) yields, leading to the compromise of and even the loss of the photodynamic effect of the PS. Therefore, much effort has been devoted to minimizing photobleaching in order to ensure that there is no loss of photodynamic efficacy. Here, we report that a type of PS aggregate showed neither photobleaching nor photodynamic action. Upon direct contact with bacteria, the PS aggregate was found to fall apart into PS monomers and thus possessed photodynamic inactivation against bacteria. Interestingly, the disassembly of the bound PS aggregate in the presence of bacteria was intensified by illumination, generating more PS monomers and leading to an enhanced antibacterial photodynamic effect. This demonstrated that on a bacterial surface, the PS aggregate photo-inactivated bacteria via PS monomer during irradiation, where the photodynamic efficiency was retained without photobleaching. Further mechanistic studies showed that PS monomers disrupted bacterial membranes and affected the expression of genes related to cell wall synthesis, bacterial membrane integrity, and oxidative stress. The results obtained here are applicable to other types of PSs in PDT.Keywords:photosensitizer (PS);photobleaching;photosensitizer aggregate;photosensitizer monomer
研究领域:
化学
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生物医学工程
·
微生物学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 47
·26839-26851
·
IF 12.732
Chenxi Li,Xingxing Ni,Yang Lei,Shangyang Li,Lei Jin,Bo You
Benefiting from a specific multilayered structure, yolk–shell microspheres with void spaces are considered promising electromagnetic shielding materials which do well in enhancing the decay of electromagnetic waves. Commonly reported synthesis methods of yolk–shell nanostructures include sacrificial templates and tedious subsequential treatment. In this work, a novel, green and facile plasmolysis-inspired route was developed to fabricate uniform yolk–shell hydrogel-core@void@MXene-shell (poly(N-isopropylacrylamide)@void@polystyrene@MXene, abbreviated to PNIPAM@void@PS@Ti3C2Tx) nanocomposite microspheres. The void space between the PNIPAM core and the PS supporting layer was created on the basis of the shrinkage of the soft PNIPAM hydrogel core due to the removal of water in the hydrogel. In addition, a microsphere model was developed to predict that the void space can modulate the impedance matching to attenuate the reflection of electromagnetic waves on the surface of the microsphere and enhance the entry of electromagnetic waves. Ultrathin hydrogel-core@void@MXene-shell (PNIPAM@void@PS@Ti3C2Tx) self-supporting films could be prepared via filtration–drying of PNIPAM@PS@Ti3C2Tx nanocomposite microspheres. The 25 μm ultrathin nanocomposite film showed excellent electromagnetic interference (EMI) shielding effectiveness of 72 dB at 9.5 GHz and exhibited a wide absorption spectral range from 8.2 GHz to 12.4 GHz (>30 dB). The electromagnetic parameters of the equivalent medium model are obtained through the retrieval algorithm of the actually measured S-parameters, and models were constructed to simulate and explain the electromagnetic shielding performance.
研究领域:
材料科学
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电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Mengxiang Liu,Jin Shi,Tao Zhang,Miao Li,Yu Zhang,Runze Zhang,Yewei Zhang,Bin Yang,Jiale Fan,Kaibo Yu
Anisotropic conductive films (ACFs) are promising materials for flexible electronics and wearable devices due to their excellent electrical conductivity and mechanical flexibility. However, simultaneously achieving high conductivity, superior mechanical properties, and long-term stability remains a critical challenge. In this study, polystyrene (PS) microspheres were surface-functionalized with acrylic acid to introduce carboxyl groups, enhancing surface reactivity for subsequent electroless silver plating. When the mass ratio of AgNO₃ to PS was 2:1, the prepared Ag/PS core–shell conductive particles exhibited a dense and continuous silver layer with an average thickness of ∼45 nm and an electrical resistivity of 2.03 × 10⁻³ Ω·cm, confirming their excellent conductivity. The epoxy resin-based ACFs prepared using these particles remained electrically insulating in both the X- and Y-directions while exhibiting a Z-axis resistivity of 6.67 × 10¹ Ω·cm after hot pressing. Furthermore, at a hot-pressing pressure of 2 MPa, the resistance was reduced to 1.2 Ω, while the shear strength reached a maximum of 1.8 MPa. The conductive mechanism of ACFs was systematically investigated by analyzing the morphological evolution of conductive particles under varying hot-pressing pressures. Additionally, the ACFs maintained stable electrical performance after 33 days of storage at 0 °C, meeting industrial transportation and storage requirements. This study provides valuable insights into the structural design and performance optimization of conductive fillers, contributing to the development of high-performance ACFs for microelectronic and flexible device applications.
✓ 已验证
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DOI
高影响因子
ANALYST
·
2022
·Vol. 147
·期 9
·1853-1858
·
IF 5.227
Tianhao Wu,Mingying Ma,Gongwei Sun,Sichun Zhang,Xinrong Zhang
Steroid hormones play important roles in metabolism and metabolic diseases. Currently, various detection methods are employed in clinical labs, mainly immunoassays and LC-MS/MS, but these methods suffer from antibody cross-reactivity or the need for complex LC processes, respectively. Here, we utilized single antibody to capture and separate multiple hormones from samples to avoid LC procedures and used MS/MS to analyze multiple molecules in a single run. In our strategy, testosterone (T), androstenedione (4-AD), and androsterone (ADT) were affinity-captured simultaneously using only T antibody. The qualitative and quantitative analysis of three androgens was realized through MS/MS spectra using testosterone-D3 (T-D3) as an internal standard. Standard curves for standard solution or spiked serum samples were realized in the range of 0.01–2 μg L−1. The LODs for the three androgens were 2.3 × 10−3 μg L−1 for testosterone, 4.6 × 10−3 μg L−1 for androstenedione, and 2.8 × 10−3 μg L−1 for androsterone. The recovery results verified the reliability and stability of our method. This strategy has widespread potential for advancing the combination of immunoassay and MS methods in the analysis of small molecules, with high through-put and low cost.
研究领域:
分析化学
·
临床化学
·
内分泌学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Tian Xiaoran,Yu Qian,Kong Xianming,Zhang Miao
The colloidal polystyrene (PS) was synthesized and decorated with silver nanoparticles (Ag NPs). The plasmonic Ag@PS nanocomposite was prepared by loading Ag NPs on PS microsphere through a seed-mediated in situ growth route. The property of Ag NPs deposited on the PS microsphere could be precisely controlled by adjusting the concentration of the chemicals used in the growth medium. The growth step is only limited by the diffusion of growing species in the growth media to the surface of the Ag seed. The Ag@PS prepared via the in situ growth method exhibited two advantages compared with the self-assembled PS/Ag. First, the high-density of Ag NPs were successfully deposited on the surface of PS as the electroless-deposited Ag seed process, which brings nearly three times SERS enhancement. Second, the rapid preparation process for in situ growth method (half an hour, 10 h for the self-assembled method). The PS/Ag could detect Nile blue A (NBA) down to 10–7 M by SERS. Furthermore, the plasmonic Ag@PS SERS substrate was used for pesticide identification. The on-site monitoring malachite green (MG) from fish was achieved by portable Raman spectrometer, and the limit of detection (LOD) was 0.02 ppm. The Ag@PS substrate has also shown capability for simultaneously sensing multiple pesticides by SERS.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Yizhou Xu,Zhichao Zhang,Ziqing Gong,Shengfei Hu
This article reports the preparation of a multi-layer core-shell flame retardant (APP@SiO 2 @MA) using melamine (MA), ethyl silicate (TEOS), and γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH-560) as raw materials, coated with ammonium polyphosphate (APP). Apply the flame retardant to PPO/PS composite materials to improve their flame retardant properties and investigate its effect on the foaming performance of PPO/PS composite materials. This article confirms the successful microencapsulation of APP by SiO 2 and MA through energy dispersive spectroscopy (EDS) analysis, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) observation. The combustion performance of P samples and their foam samples was evaluated through thermogravimetric analysis (TG), limit oxygen index (LOI), and UL-94 vertical combustion test, the residual carbon quality significantly increased from 17% of PPO/PS to 38%, and the maximum oxygen index increased from 22.9% to 30.5%. At 165°C and 3.5 MPa foaming conditions, the foaming ratio increased from 1.18 to 4.56 times, and the maximum oxygen index after foaming was 27.9%. This study provides a green and convenient method for the preparation of flame-retardant PPO/PS bead foam materials, expanding the practical application of PPO/PS in industry.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）