COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengyu Li,Yahan Bai,Wei Zhuang,Jinle Liu,Zhi Wang,Yuan Rao,Mengran Li,Hanjie Ying,Pingkai Ouyang
A novel magnetic 2D/2D heterogeneous structure MXene@NiFe-LDH@Fe 3 O 4 was prepared for immobilization of laccase. In this work, two-dimensional MXene nanosheets with abundant surface functional groups were heterogeneously assembled with layered double hydroxide (LDH) by in situ co-precipitation method, and magnetic nanoparticle Fe 3 O 4 with excellent biocompatibility and rapid separation of materials and substrates was introduced subsequently, and then silane coupling agent was coated on the surface of MXene@NiFe-LDH@Fe 3 O 4 . The functionalized MXene@NiFe-LDH@Fe 3 O 4 was employed as a carrier to immobilize laccase from Trametes-Versicolor . The enzyme loading of the nanocomposite material is as high as 167.9 mg/g. Compared with free enzymes, the immobilized laccase showed a notable improvement in stability in a wider range of pHs (2.0–8.0), temperatures (25–60 °C), and organic solvent concentration (1–5 M). The reusability study suggested that after 7 cycles of repeated catalysis, the degradation efficiency could reach 55.5% for 2,4-dichlorophenol, 92.1% for bisphenol A and70.9% for pyrocatechol. The results provide a new carrier preparation strategy for the efficient immobilization of laccase.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hongyu Cao,Liang Ji,Shengping Shen
Limited by the existing electrode nanostructures, electrochemical actuators (EAs) can hardly work with high response rate, while maintaining large deformations under low driving voltages. Herein, this challenge is overcome via constructing the heterogeneous interface mismatch of 2D Cu 3 (HHTP) 2 MOFs and 3D Cu(OH) 2 nanotubes for the first time. The mismatch of the spatial configurations at the heterogeneous interface leads to the modulation in nanostructures and thereby arrays of MOFs’ crystals. Consequently, the 2D Cu 3 (HHTP) 2 is tailored for integrating not only an inherent high porosity, but also a controllable crystal size, uniform distribution, and few layers-stacking structure, all of which contribute to the rate and quantity of migrated ions. Experiments indicate that the EA exhibits a large voltage-dependent deformation (0.463 mm −1 V −1 ), a high response rate (0.031 mm −1 s −1 V −1 ), an ultra-low driving voltage (−0.2 V), and an upper limit of working frequency range as high as 20 Hz. Moreover, a mechanical stress of 19.24 MPa and an energy density of 23.94 kJ m −3 at continuous working condition (−0.3 V, 0.01 Hz) are also achieved, further enabling the EA to actuate a block over 25 times heavier than itself easily. By introducing a new strategy for improving EAs’ performance, this research promotes the potential application of next-generation EAs.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 13
·期 1
·499-505
·
IF 4.036
Rong Wang,Jiamin Luo
Rapid and accurate identification of bacteria is essential to ensure food safety and prevent pathogenic bacterial infection. In this study, a highly efficient method was established for accurately identifying bacterial species by applying Ag NP-filter paper based Surface enhanced Raman spectroscopy (SERS) analysis and Partial Least Squares-Discriminant Analysis (PLS-DA) statistical methods. The flexible Ag NP filter paper substrate with high sensitivity and uniformity was prepared by a facile and low-cost silver mirror reaction at room temperature, which exhibited desirable SERS activity in bacteria detection. Furthermore, PLS-DA was successfully employed to distinguish SERS spectra from S. aureus CMCC 26003, E. faecalis ATCC29212 and L. monocytogenes ATCC 19115 with a sensitivity of 93.3–100%, specificity of 96.7–97%, and overall predicting accuracy of 95.8%. This exploratory study demonstrates that a Ag NP-filter paper based SERS sensor coupled with PLS-DA has great potential for rapid and effective detection and identification of bacteria.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dian Dai,Mingxiang Qv,Dongyang Liu,Chunming Tang,Wei Wang,Qirui Wu,Zhihong Yin,Liandong Zhu
Magnetic harvesting of microalgae depends on the interface interactions between microalgal cells and flocculants, and thus it is important to find a reasonable evaluation method understand these interface interactions. In this effort, we discussed the formation mechanism and pH regulation of microalgae magnetic harvesting via magnetic chitosan (Fe 3 O 4 @SiO 2 -CS) synthesized by a micro-emulsion method. The flocculation performances and mechanisms during the harvesting of microalgae by the novel flocculant were evaluated. The synthesis process and structure were determined by XRD, FT-IR, SEM and XPS, and the results indicated that Fe 3 O 4 @SiO 2 -CS was successfully prepared. The collection efficiency of 96.52 % was achieved for Chlorella vulgaris within 3 min using Fe 3 O 4 @SiO 2 -CS with the Fe 3 O 4 @SiO 2 and CS mass ratio of 1:3 under pH 1.0. Moreover, this study introduced the two-dimension fractal dimension and extended Derjaguin-Landau-Verwey-Overbeek (E-DLVO) model to evaluate the harvesting performances and mechanisms of Fe 3 O 4 @SiO 2 -CS. Experimental results showed that a strong electrostatic interaction was formed under acidic conditions between Fe 3 O 4 @SiO 2 -CS and microalgae cells with D 2 = 1.82 (fractal dimension value). The hydrophobic tryptophan-like amino acid was observed in the slime-extracellular polymeric substances (S-EPS) secreted by microalgae. S-EPS was found to be a significant substance to promote harvesting performance when the system was neutral or alkaline. This work provides deeper insights into microalgae harvesting by Fe 3 O 4 @SiO 2 -CS as well as reasonable mechanisms to illustrate the interaction of Fe 3 O 4 @SiO 2 -CS and microalgae under different pH values.
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Yanqing Cong,Lingjie Ye,Shiyi Zhang,Qiuyu Zheng,Yi Zhang,Shi-Wen Lv
Constructing hollow structure is an effective strategy to boost the activity of heterogeneous catalysts in peroxymonosulfate (PMS) activation. Herein, a newly-designed Ni-CoO yolk-shell hollow sphere was first synthesized by a step-by-step method. Interestingly, the etching treatment of NH 3 ·H 2 O endowed Ni-CoO sphere with hollow yolk-shelled structure, which was beneficial for the increase of specific surface area and the full exposure of active sites. The calcination treatment reduced the charge transfer resistance and enhanced the redox ability of Ni-CoO, further improving its catalytic activity . As expected, 93.1% of diclofenac sodium (DCF) could be rapidly degraded within 5 min over developed Ni-CoO-3/PMS system, and removal efficiency of TOC was as high as 73.3%. Significantly, redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ were responsible for PMS activation based on radical pathways (namely SO 4 •− , OH • and O 2 •− ). As the typical radical pathway, 1 O 2 was also involved in DCF degradation. More importantly, Ni-CoO-3-PMS* complexes mediated the direct electron transfer between DCF and PMS. Furthermore, Ni-CoO-3/PMS system with great stability had excellent practical application prospect in actual wastewater treatment . In short, current work not only offered a high-efficiency catalyst for PMS activation, but also shared some insights into the research on advanced oxidation processes .
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2022
·Vol. 12
·期 1
·8
·
IF 5.561
Xiaodong Huang,Huifang Liu,Xiaomin Xu,Ge Chen,Lingyun Li,Yanguo Zhang,Guangyang Liu,Donghui Xu
In this study, a novel composite material prepared by using deep eutectic solvent (tetrabutylammonium chloride-dodecanol, DES5) functionalized magnetic MWCNTs−ZIF−8 (MM/ZIF−8@DES5) was employed as an adsorbent for the magnetic solid-phase extraction of six pyrethroids from tea drinks. The characterization results show that MM/ZIF−8@DES5possessed sufficient specific surface area and superparamagnetism, which could facilitate the rapid enrichment of pyrethroids from tea drink samples. The results of the optimization experiment indicated that DES5, which comprised tetrabutylammonium chloride and 1-dodecanol, was selected for the next experiment and that the adsorption properties of MM/ZIF−8@DES5were higher than those of MM/ZIF−8 and M-MWCNTs. The validation results show that the method has a wide linear range (0.5–400 μg L−1, R2≥ 0.9905), low LOD (0.08–0.33 μg L−1), and good precision (intra-day RSD ≤ 5.6%, inter-day RSD ≤ 8.6%). The method was successfully applied to the determination of pyrethroids in three tea drink samples.Keywords:magnetic solid-phase extraction;deep eutectic solvent;ZIF−8;pyrethroids;tea drinks
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhihao Chen,Xianliang Li,Bin Gong,Nico Scharnagl,Mikhail L. Zheludkevich,Hanjie Ying,Wenzhong Yang
Stimuli-responsive nanocapsules, which can respond to various environmental stimuli and release their encapsulated payload on demand, have attracted wide interest in different fields in recent years. In this work, a novel kind of polypyrrole (PPy) nanocapsules is fabricated and loaded with zinc salt corrosion inhibitors. The synthesized PPy nanocapsules respond to two different external stimuli (pH- and redox-responsive) and can control the release of their encapsulated corrosion inhibitors. The nanocapsules can detect the micro-environmental pH or surface-potential changes associated with the corrosion initiation of the metal substrate. When introduced into a protective epoxy coating, the fabricated PPy nanocapsules inhibit the anodic and cathodic corrosion reactions. The superior corrosion resistance and active corrosion protection effects of the epoxy-PPy-Zn coatings are further demonstrated via electrochemical and long-term immersion tests. The low-frequency impedance, coating resistance, and oxide film resistance increase after about 400 h of exposure in a 3.5 wt % NaCl solution, reflecting the enhanced corrosion protection properties and excellent repairing performance of the coating. Furthermore, the epoxy-PPy-Zn coating can avoid the pitting corrosion of 304 stainless steel. Overall, we have fabricated double stimuli-responsive PPy nanocapsules via a simple and effective strategy and incorporated them into a corrosion-resistant epoxy coating for protecting Fe-based metal substrates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Composites Science
·
2023
·Vol. 7
·期 2
·51
·
IF 3.3
Zhanqi Li,Ling Zhu,Xiaowen Xie,Meng Zhou,Changqing Fu,Shuai Chen
Despite the fact that PEDOT:PSS has been successfully used in the field of flexible electronics, some of its applications in the domain of rigid conductive coating have been limited by the pricey cost and subpar mechanical properties (hardness, adhesion, and moisture absorption) of the commercially available Clevios™ PH 1000, as well as the poor conductivity, film formation, and mechanical properties of the self-made PEDOT:PSS. In the process of investigating the low-cost preparation of PEDOT-based conductive polymer coatings, we discovered that self-made PEDOT:PSS, a waterborne epoxy resin, and a bio-based epoxy curing agent can be blended uniformly to produce good film-forming conductive coatings. Later, the addition of KH560-modified nano-SiO2further improved the coating’s hardness while ensuring a modest increase in conductivity. Meanwhile, the inadequacies of the epoxy resin, which are not UV-resistant, were considerably improved by the synergistic action of PEDOT:PSS and the modified SiO2. The result is a low-cost method designed for creating conductive coatings that are UV-resistant and may be utilized for electromagnetic, electrothermal, and antistatic shielding applications. Such a PEDOT:PSS/epoxy composite system and its design approach will broaden the scope of PEDOT:PSS’s application and will inspire future research in and practical implementations of PEDOT:PSS-based conducting coatings.Keywords:waterborne epoxy resin;PEDOT:PSS;high hardness;conductive coatings;bio-based;UV-resistant
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao Zhang,Yuenan Zhang,Yuanbo Pan,Fangfang Wang,Yufeng Sun,Shengwen Wang,Zongbao Wang,Aiguo Wu,Yujie Zhang
Heavy metals in wastewater and soil pose serious threats to the ecological environment and human health. Chemical modification and composite design are the main design strategies for high-performance heavy metal adsorbents. However, in this study, a unique way was adopted to improve the adsorption performance of MnO 2 by tailoring its hollow mesoporous structure (HMN). Unmodified HMN which has good stability under acidic conditions was directly used for adsorption and fixation of heavy metals in wastewater and soil. The adsorption capacity of HMN has been greatly improved compared with other MnO 2 adsorbents, and its adsorption capacities for Pb 2+ , Cu 2+ and Cd 2+ reached 897.0, 437.5 and 354.3 mg g −1 , respectively. Such high adsorption performance is rarely seen in manganese-based adsorbents. Purification results of laboratory wastewater and industrial wastewater showed that it has good application prospect for actual environmental water samples. The adsorption mechanism mainly includes physical adsorption, electrostatic adsorption, surface complexation (oxygen sites and hydroxyl groups) and ion exchange between Na + and heavy metal ions. In addition, HMN can effectively passivate heavy metals in contaminated soil and reduce their leaching concentration to improve soil safety. This improvement in the performance of adsorbents by tailoring their structures is instructive and provides insight and approach for the design and preparation of advanced adsorbents.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lu Pengpeng,Fu Xue,Li Xin,Xu Li,Yong Fan,Jie Zhao,Limei Tian,Jiyu Sun,Luquan Ren
An anticorrosive coating with randomly distributed passive barriers and regionally enriched active corrosion inhibitors is developed by integrating mica nanosheets (MNSs) and magnetic-responsive core–shell mesoporous nanoparticles with 2-mercaptobenzothiazole (Fe3O4@mSiO2/MBT) under magnetic field incubation. The bottom enriched Fe3O4@mSiO2/MBT rapidly releases the MBT to form a passivation layer on corrosion sites, enhancing the corrosion inhibition efficiency by 30.36% compared with the control (NP0.7EP-R). The impedance modulus |Z|0.01 Hz of the sample (NP0.7/MNS0.5/EP) increases by five orders of magnitude compared with that of its control (NP0.7/MNS0EP) after 30 days of corrosion immersion. NP0.7/MNS0.5/EP exhibited the lowest corrosion rate (3.984 × 10–5 mm/year) as compared to the other samples. Notably, the coating in a fractured state still maintains superior corrosion inhibition even after 40 day salt spray testing. The differentiated distribution of nanofillers was well confirmed by optical microscopy and SEM-EDS, and the synergistic effect of the active/passive integrated anticorrosive coating with merits of both comprehensive protection and fast responsiveness was systematically explored.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Tingting Liu,Xiaocui Lai,Ping Guo,Wei Zhang,Gan Zhang,Mengyun Wu,Guangjian Xue,Xuechen Fang,Juan Peng,Weihua Lai
As kanamycin (KAN) residue in animal products is harmful to consumers, a rapid and sensitive method for KAN detection needs to be established. KAN monoclonal antibody (KAN-mAb, 1D11) with the half maximal inhibitory concentration of 1.16 ng/mL was prepared in this study. A one-pot method was used to synthesize Fe 3+ -chelated polydopamine nanospheres (Fe@PDANs) with excellent characteristics of strong light absorption. The novel label of Fe@PDANs and KAN-mAb was used to develop a lateral flow immunoassay (LFIA) for the sensitive detection of KAN. The limit of detection of the Fe@PDANs-based LFIA (Fe@PDANs-LFIA) for KAN was 0.0191 ng/mL, which was 2.75 times lower than PDANs-based LFIA. Furthermore, the Fe@PDANs-LFIA was successfully applied to detect KAN in pork, milk, and honey samples, with recoveries ranging from 93.75% to 113.80% (coefficient of variation < 10%). Therefore, Fe@PDANs have potential for the detection of analytes in LFIA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Wenting Fan,Fang Zhao,Ming Chen,Jian Li,Xuhong Guo
A new microreactor with continuous serially connected micromixers (CSCM) was tailored for the coprecipitation process to synthesize Fe 3 O 4 nanoparticles. Numerical simulation reveals that the two types of CSCM microchannels (V-typed and U-typed) proposed in this work exhibited markedly better mixing performances than the Zigzag and capillary microchannels due to the promotion of Dean vortices. Complete mixing was achieved in the V-typed microchannel in 2.7 s at an inlet Reynolds number of 27. Fe 3 O 4 nanoparticles synthesized in a planar glass microreactor with the V-typed microchannel, possessing an average size of 9.3 nm and exhibiting superparamagnetism, had obviously better dispersity and uniformity and higher crystallinity than those obtained in the capillary microreactor. The new CSCM microreactor developed in this work can act as a potent device to intensify the synthesis of similar inorganic nanoparticles via multistep chemical precipitation processes.
✓ 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）