CHEMICAL ENGINEERING SCIENCE
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2024
·
IF 4.1
Qi Li,Senlin Deng,Junyang Liu,Tingting Yan,Jinguo Hao,Gang Wang,Guoliang Zhang,Jie Li,Chunshan Li
The dispersion of active sites plays an imperative role in the promotion of catalytic performance on methyl acrylate synthesis via direct vaporous aldol condensation. Herein, a novel PEG-assisted impregnation method was proposed to synthesize Cs/Zr-SiO 2 catalyst with high dispersion of acid and base sites. A series of characterization techniques including NMR, TEM, physical N 2 adsorption isotherms, XRD, XPS, NH 3 -/CO 2 -TPD, and Py-IR were used to investigate the physico-chemical properties of these prepared catalyst series. The introduction of PEG improved the specific surface area, dispersion of active sites, and density of acid and base sites, resulting in superior catalytic performance of Cs/PEG@Zr-SiO 2 by comparison with that of Cs/SiO 2 and Cs/Zr-SiO 2 . The kinetic experiments revealed that the activation energy of aldol condensation was 80.8 kJ/mol over the Cs/PEG@Zr-SiO 2 catalyst. The deactivation behavior derived from carbon deposition was discovered, and the spent catalyst could be regenerated by simple thermal treatment.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang
In this work CS-SDAEM polymer brushes with long-chain structure were synthesized, and TiO 2 /CS-SDAEM nanoparticles were prepared by modifying them on the TiO 2 surface. The prepared modified membrane can effectively degrade dyes through photocatalysis and can reduce the contamination rate of the membrane during use. The separation membrane achieves efficient removal of contamination by self-cleaning. The results of the membrane surface analysis test show that the formation of coordination bonds between o-benzenetriol of GA and TiO 2 , and the chemical reaction between CS and GA, which promote the stability between coating components. The results of filtering tests show that with the excellent anti-fouling performance of long-chain polymer brush, the photodegradability of TiO 2 and a large number of hydrophilic groups contained in GA and CS, PVDF- TiO 2 /CS-SDAEM membranes overcome the above shortcomings and achieve super-hydrophilicity, anti-fouling and self-cleaning. In addition, DFT model simulations of photocatalytic processes show that there is a charge transfer between CS and TiO 2 , which increases the width of the high light absorption band and improves the efficiency of photodegradation. Modified membranes achieve efficient self-cleaning processes and low flux decline rates, which hold great promise for use in real wastewater application scenarios.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Daqin Chen,Junni Li,Xiao Chen,Jiangkun Chen,Jiasong Zhong
Currently, metal halide perovskite nanocrystals have been extensively explored due to their unique optoelectronic properties and wide application prospects. In the present work, a facile grinding method is developed to prepare whole-family APbX3 (A = MA, FA, and Cs; X = Cl, Br, and I) perovskite nanocrystals. This strategy alleviates the harsh synthesis conditions of precursor dissolution, atmosphere protection, and high temperature. Impressively, the as-prepared perovskite nanocrystals are evidenced to have halogen-rich surfaces and yield visible full-spectral emissions with maximal photoluminescence quantum yield up to 92% and excellent stability. Additionally, the grinding method can be extended to synthesize widely concerned Mn2+-doped CsPbCl3 nanocrystals with dual-modal emissions of both excitons and dopants. As a proof-of-concept experiment, the present perovskite nanocrystals are demonstrated to be applicable as blue/green/red color converters in UV-excitable white-light-emitting diodes.
研究领域:
材料科学
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纳米技术
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Fan Wang,Zehui Zhang
In this study, a new method was developed for the oxidation of 5-hydroxymethylfurfural (HMF) into 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) over heterogeneous Ru catalyst. Cs-substituted tungstophosphate (CsPW) was prepared by the exchange of H + in H 3 PW 12 O 40 with Cs + , which was then used to immobilize Ru nanoparticles to give the Ru/CsPW catalyst. The Ru/CsPW catalyst was well characterized by TEM, XRD, XPS and FT-IR technologies. The physical characterizations clearly indicated that the spherica Ru nanoparticles with an average size of 2.4 nm were homogeneously dispersed on the surface of the CsPW support. The as-prepared catalyst was studied for the oxidation of HMF, and some important parameters were investigated. The reaction solvent showed a great effect on both HMF conversion and the products selectivity. Aromatic solvents were found to be the best reaction medium for the oxidation of HMF into HMFCA. Increasing the reaction temperature and the amount of the Ru/CsPW catalyst accelerated the HMF conversion and HMFCA yield. High HMF conversion of 97.2% and HMFCA yield of 72.9% were obtained after 12 h at 130 °C with oxygen flow rate of 20 ml/min. Unfortunately, the Ru/CsPW catalyst was not very stable during the reaction, and a slight loss of its catalytic activity was observed during the recycling experiments.
研究领域:
化学
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催化材料
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Ruirui Zhang,Shugui Hua,Yuan Dang,Bing Zhang,Xiaoqin Sun,Sha Yu,Yingying He,Shuangli Chen,Yuanzhen Zhou
In this paper, the electrocatalytic performance of Ti/β-PbO 2 anode was improved by doping Cs into SnO 2 intermediate layer (Ti/Cs-SnO 2 /β-PbO 2 ) for the efficient degradation of fluoroquinolone wastewater. Compared with the conventional Ti/Sb-SnO 2 /β-PbO 2 anode, Cs-SnO 2 with the rougher surface increased the deposition amount and the thickness of β-PbO 2 active layer, thus forming the denser PbO 2 coating with smaller particle size and exposing more active sites. The partial replacement of Sn by Cs with the smaller ion radius induced the deformation of crystal lattice of SnO 2 , which further led the outer β-PbO 2 active layer grew along the advantageous (200) crystal plane and formed more point defects in the crystal lattice of β-PbO 2 . Thereby, the electron transfer rate at the anode interface was accelerated and the electrocatalytic performance of Ti/β-PbO 2 was significantly improved. To verify the practical application of the improved Ti/Cs-SnO 2 /β-PbO 2 electrode, levofloxacin (LFX) and ciprofloxacin (CIP) were selected as the typical target fluoroquinolones to evaluate the degradation efficiency of Ti/Cs-SnO 2 /β-PbO 2 anode. The removal rate exceeded more than 90% for the single and mixed fluoroquinolones wastewater. Moreover, after 5 times’ recycle, the degradation efficiency of LFX on Ti/Cs-SnO 2 /β-PbO 2 anode still remained over 90%. The potential mechanism of the enhanced electrocatalytic performance of Ti/Cs-SnO 2 /β-PbO 2 and the degradation pathways of fluoroquinolones were also inferred. It’s the first time to enhance the electrocatalytic performance of the Ti/β-PbO 2 anode by introducing monovalent alkali metal (C S ) into the SnO 2 intermediate layer and the proposed Ti/Cs-SnO 2 /β-PbO 2 anode would be a promising candidate to realize the efficient removal of the practical fluoroquinolones antibiotic wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuanhang Zhao,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang,Aihua Xie
Currently, the most effective way to improve the anti-fouling performance of water treatment separation membrane is to enhance the hydrophilicity of the membrane surface, but it can still cause contamination, leading to the occurrence of flux reduction. The construction of a strong hydration layer to resist wastewater contamination is still a challenging task. In this study, a defect-free hydration layer barrier was achieved by grafting chitosan polysaccharide derivatives (CS-SDAEM) on the membrane, which achieved in effective fouling prevention and low flux decline rate. A layer of tannic acid-coated carbon nanotubes (TA@CNTs) has been uniformly deposited on the commercial PVDF membrane so that the surface was rich in -COOH groups, providing sufficient reaction sites. These reactive groups facilitate the grafting of amphiphilic polymers onto the membrane. This modification strategy achieved in enhancing the antifouling performance. The modified membrane achieved low contamination rate with DR of 16.9 % for wastewater filtration, and the flux recovery rate was above 95 % with PWF of 1100 (L·m −2 ·h −1 ). The membrane had excellent anti-fouling performance, which provided a new route for the future development of water treatment membrane.
研究领域:
环境科学
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Dong-Xue Zhang,Shuai Qu,Yu-Han Liu,Chen Xu,Xiao-Ying Liu,Hong Kan,Kai Dong,Ying-Ping Wang
In this study, we employed a melamine sponge (MS) as the skeleton material and utilized carbonized ZIF-8 (CZIF-8) and chitosan (CS) as the raw materials to prepare CZIF-8/CS-MS, a novel material featuring a three-dimensional interconnected porous network. The resulting CZIF-8/CS-MS material possesses a unique porous structure, significant specific surface area and abundant active sites. These characteristics make CZIF-8/CS-MS a promising absorbent for selective purification of plant growth regulators (PGRs) including 1-naphthlcetic acid (NAA), naphthoxyacetic acid (NOA), 4-chlorophenoxyacetic acid (4-CPA), 2,4-dichlorophenoxyacetic acid (2,4-D). After optimizing the extraction conditions, excellent linearity ( r > 0.9994) was observed within a wide linear range of 1–100 ng/mL using ultra high performance liquid chromatography-tandem quadrupole mass spectrometry. The detection limits (LODs) and limits of quantification (LOQs) were found to be in the range of 0.013–0.154 ng/mL and 0.044–0.515 ng/mL, respectively. Additionally, the relative recovery of Schisandra chinensis fruit samples was determined to be 89.7–99.4 %, with a relative standard deviation (RSDs) of ≤ 8.4 % ( n = 3). Compared to other methods, this approach offers a multitude of benefits, which include but are not limited to exceptional sensitivity, reduced sample volume requirements, low LODs, a comparable linear range, and high reproducibility. The findings of this study pave the way for exploring novel functionalized sponge columns, which leverage the integration of nano-sorbent materials and coating agents, for the purpose of analyzing PGRs within intricate matrix samples.
研究领域:
分析化学
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植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2021
·
IF 3.932
Tao Chen,Yuan Zhao,Ya-nan Sang,Min Tang,Guo-wen Hu,Xiao-bing Han,Jie Gao,Rui Ma
Efficient adsorption and separation of organic dyes in the wastewater is highly desirable for environmental protection. A facile synthesis of magnetic bio-based chitosan (CS) microspheres grafted with sodium polystyrene sulfonate (SPSS) via electron beam radiation is described. The obtained microspheres were characterized by FTIR, SEM, TG and VSM, which demonstrated millimetric magnetic CS-g-SPSS microspheres were obtained with enhanced thermal stability. Experimental parameters such as absorbed dosage, mass ratio, initial pH, initial concentration and contact time for the adsorption were thoroughly investigated. To investigate the adsorption rate and recyclability, evaluation of adsorption kinetic model and adsorption/desorption experiment were conducted.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 22
·4221-4232
·
IF 4.543
Yeying Wang,Xijian Liu,Guoying Deng,Qian Wang,Lijuan Zhang,Qiugen Wang,Jie Lu
In this work, multifunctional polystyrene@chitosan@gold nanoparticles–Fe3O4 nanoparticles–folic acid/indocyanine green (PS@CS@Au–Fe3O4–FA/ICG) nanocomposites that can integrate diagnosis and therapy into one nanoplatform was fabricated. The constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites possessed excellent computed tomography, magnetic resonance and fluorescence imaging performances which could be used to diagnose tumor and monitor the nanocomposites’ localization in vivo. Moreover, PS@CS@Au–Fe3O4–FA/ICG nanocomposites can be delivered in a targeted manner to cancer cells by folic acid in a receptor-mediated way, and tumor growth could be efficiently inhibited, even completely ablated, under NIR irradiation. That is, the constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites had great potential for computed tomography, magnetic resonance and fluorescence imaging performances, which could be used to diagnose tumors and to monitor local therapy and fluorescence imaging-guided targeted therapy of cancer cells using nanocomposites.
研究领域:
生物医学工程
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癌症治疗
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Wei Liao,Xinquan Zhou,Jiance Jin,Yuzhen Wang,Zhiguo Xia
Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due to the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram-driven strategy for designing TLMs in Cs–Cd–Br ternary system is presented. The room temperature stable Cs 7 Cd 3 Br 13 crystal is first obtained by utilizing a facile hydrothermal method, and the self-trapped exciton (STE) luminescence is improved by breaking local symmetry via Mg 2+ doping. Then thermochromic luminescence is further realized in Mn 2+ co-doped Cs 7 Cd 3 Br 13 on the basis of reversible structural transition to metastable Cs 2 CdBr 4 under thermal stimuli. The emission color change from bright yellow to green benefits from the variation of crystal fields around Mn 2+ , which can be switched by heating and cooling circulations. Finally, the resulting material is used as a demo to visualize the temperature of a homemade high-frequency induction heating sintering platform.
研究领域:
材料科学
·
光学工程
·
温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2015
·
IF 3.545
Yange Sun,Xingxing He,Jian Ji,Min Jia,Zhouping Wang,Xiulan Sun
This paper presents a new electrochemical DNA biosensor constructed using a substrate electrode composed of a novel nanocomposite material prepared using gold nanoparticles (Au-NPs) and multiwalled carbon nanotubes (MWCNTs) and further modified with an Au electrode (AuE), which was used as the substrate electrode. A single-stranded DNA (ssDNA) probe was immobilized on the Au-NPs/CS–MWCNTs/AuE electrode by means of facile gold–thiol affinity, which resulted in hybridization with the target ssDNA sequence. Hybridization reactions were assessed by using the reduction peak current of methylene blue (MB) as an electrochemical indicator. The advantages of the nanomaterials were found to include high surface area, favorable electronic properties, and strong electrocatalytic activity . The amount of ssDNA adsorbed on the electrode surface was increased and the electrochemical response of MB accelerated. The differential pulse voltammetric responses of MB were in line with the specific target ssDNA sequence within the concentration range 1.0×10 −15 –1.0×10 −8 M with the detection limit 3.3×10 −16 M (3 σ ). In the colony forming unit (CFU) we were able to detect 10 CFU mL −1 of Staphylococcus aureus in the tap water, achieving good discrimination ability between one- and three-base mismatched ssDNA sequences. The polymerase chain reaction (PCR) amplification products of S. aureus nuc gene sequence were also detected with satisfactory results.
研究领域:
生物化学
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纳米技术
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电化学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2025
·
IF 3.6
Ling Peng,Yusong Pan,Qianqian Liu,Cuilian Wei,Run Huang,Wenjie Luo,Xiuling Lin,Jun Tao,Yinghai Xie
Spinal cord injury (SCI) is a common disease worldwide. Tissue engineering scaffolds are considered a promising strategy for SCI treatment, but their efficacy is significantly limited by the local abundance of MSC (mesenchymal stem cell) and a highly inflammatory microenvironment. In this study, a multifunctional composite scaffold of polycaprolactone/chitosan (PCL/CS) loading polydopamine (PDA)-coated nerve growth factor (NGF) loaded onto was prepared using a freeze-drying method. The PCL/CS composite scaffold exhibited tunable degradation properties and excellent biocompatibility. The PDA coating demonstrated potent free radical scavenging capabilities, achieving clearance rate of 90.65%, 77.53%, and 60.77% for DPPH, H2O2, and ·OH radicals, respectively. Remarkably, the scaffold effectively reduced intracellular ROS levels within 24 h under oxidative stress conditions. Flow cytometry revealed rapid cellular internalization, with the FITC-labeled PC-5-PDA group exhibiting a 99.87% FITC+ rate within 12 h. NGF release from the scaffold induced robust neuronal differentiation of PC-12 cells, as evidenced by a 58.1% increase in neurite length (from 104.77 μm at day 3 to 165.66 μm at day 4) and upregulated expression of microtubule-associated protein 2 (MAP2). These findings demonstrate the dual functionality of the scaffold, which is effectively modulating the post-SCI inflammatory microenvironment while promoting neural regeneration.
研究领域:
生物材料
·
组织工程
·
神经再生
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抗氧化治疗
·
干细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）