COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
De-Yan Qi,Chong Wang,Qi-Yu Liang,Hong-Wei Li,Yuqing Wu
In the present study, glutathione-capped gold nanoclusters (AuNCs@GSH) were prepared by an improved hydrothermal method , which showed near-infrared (NIR) emission centered at 805 nm. Besides, Ag + can induce the NIR emission transformations in a two-stage mode under different concentration ranges of Ag + . At the first stage (0.50–15 μM), a new emission at 615 nm was generated while the original NIR emission was quenched upon Ag + addition; at the second stage (15–120 μM), it shifted to 720 nm gradually along with more Ag + addition, which realized precise regulation of the emission range of metal nanoclusters from red to NIR region. The in-depth mechanism investigation revealed the transformations in both stages originated from the anti-galvanic reaction (AGR) of AuNCs toward Ag + and Ag deposition. In detail, the first stage was attributed to the formation of bimetallic gold and silver nanoclusters (Au-AgNCs); while the second stage ascribed to the Ag deposition-induced size growth and composition changes of Au-AgNCs. Therefore, the present study supplies a simple and rapid method for preparing NIR-emitted AuNCs and provides a facile approach to regulate the photoluminescence ranges based on the AGR and Ag deposition.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhishang Wan,Lihong Gan,Wei-Ning Wang,Yi Jiang
Electrospray is an effective, fast, and potentially scalable approach for membrane surface functionalization using various engineered nanomaterials (ENMs). However, the lack of fundamental understandings of the deposition process hinders the controlled deposition, efficient utilization, and long-term stabilization of the ENMs, and thus the practical applications of the nanocomposite membranes. To bridge this critical knowledge gap, advanced online characterization techniques (laser diffraction size measurement and laser doppler velocimetry) coupled with mathematical aerosol modeling are utilized to understand the three key process parameters: droplet size, deposition velocity , and evaporation rate. After deposition, polymeric solvent bonding (i.e., interdiffusion and subsequent entanglement of polymers) was found to substantially stabilize the deposited Ag NPs. We further provide a comprehensive description of such interfacial reaction mechanisms. Our results show a consistency between theoretical predication and measurement of the droplet size or deposition velocity, whereas realistic droplet evaporation rate is lower than the theoretical value due to the addition of the polymer. Successful stabilization of Ag NPs via interfacial polymeric bonding occurs under the conditions of large material contact area, high material compatibility, proper temperature (e.g., 22 °C), and polymer-to-solvent ratio (e.g., 3–5%). Our coupled approach achieves superior Ag NP coverage with high stability within minutes. Despite some reduction in water permeance, the resultant membrane shows markedly improved catalytic and antimicrobial (antibiofouling) performance (>90% enhancement) and maintained rejection. Taken together, our findings provide fundamental insights into the coupled process of electrospray deposition and polymeric solvent bonding to enable additive manufacturing of novel nanocomposite membranes with diverse structures and multiple functions.
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JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Xiu-yan Zhang,Ting Wang,Li-guang Wu,Hai-Chang Guo
In order to improve the separation performance and anti-fouling property of polyvinylidene fluoride (PVDF) ultrafiltration membranes, PVDF mixed matrix membranes (MMMs) were obtained by mixing PVDF with Ag@ZIF-8 using a simple one-pot microemulsion strategy. First, both Ag and ZIF-8 were generated in one micelle of the microemulsion during the formation of composites. After in-situ polymerization of microemulsion， the latex containing Ag@ZIF-8 was blended with PVDF by phase-inversion method to construct the MMMs. The small-sized Ag particles were closely distributed on the surface of ZIF-8 after the formation of ZIF-8 in micelles. The subtle interaction forces between the two facilitated the distribution of the composite in the PVDF matrix. In addition, the hydrophilic component in the latex improves the pore structure , the permeation and anti-fouling performance of the PVDF matrix compared to neat PVDF and the MMM with ZIF-8 added. Mixed-matrix ultrafiltration membranes with 0.3 wt% of microemulsion containing Ag@ZIF-8 exhibited good permeation ( J w = 222 L m −2 h −1 ) and flux recovery rate ( FRR = 82%). The well-distributed Ag@ZIF-8 in PVDF polymeric matrix strengthened the dye retention of MMMs from high-salinity wastewater, due to the interaction between Ag@ZIF-8 and dye molecules. This mixed-matrix ultrafiltration membrane also showed optimum dye rejection (97.3%) and low salt rejection (0.2%). The MMMs combined with Ag@ZIF-8 in this work are promising for the removal of dye contaminants for high-salinity wastewater, so as to achieve the goal of advanced treatment for high-salinity wastewater.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Mingchun Lv,Da-Wen Sun,Hongbin Pu,Haofan Zhu
Recyclable surface-enhanced Raman scattering (SERS) substrates are beneficial to cost reduction and environmental protection and have always been a research topic with great interest. Herein, a core–shell-satellite structured SERS substrate Fe 3 O 4 @MIL-100(Fe)@Ag nanoparticles (FMAs) was developed, possessing versatile functionalities of adsorption, detection, degradation and recovery. Results showed that the MIL-100(Fe) with peroxidase-like activity as shell catalyzed H 2 O 2 to generate ·OH degraded pollutants within 5 min to achieve substrate cleaning, making FMAs recyclable for at least 5 times to sequentially detect different cationic dyes with high sensitivity, having low detection limits as low as 15.24 ng/L, 387.87 ng/L and 0.71 ng/g for crystal violet in deionized water, aquaculture water and tilapia, respectively. FMAs also showed good uniformity, reproducibility and stability, with a relative standard deviation value of 5.58 % between substrates and about 78.60 % SERS activity remained after 20 d storage at 4 °C. This FMAs substrate thus has great potential for selective detection of trace cationic dyes in food or other fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jing Liu,Min Ma,Xin Yu,Changhui Xin,Mingxue Li,Shijie Li
Constructing S-scheme charge transfer pathways is often considered to be an efficient strategy for boosting interfacial charge separation for high-performance photocatalysis, especially for ultrawide bandgap tantalum-based semiconductors. In this work, defects-mediated S-scheme ZnS 1-x quantum dots (QDs)/Ta 2 O 5-x composites decorated with Ag were prepared by the modified solvothermal and photoreduction methods and employed for visible-light photocatalytic toxic tetracycline degradation. Compared with commercial Ta 2 O 5 , pristine Ta 2 O 5-x microspheres, and ZnS 1-x QDs , the prepared Ag/ZnS 1-x /Ta 2 O 5-x -1.0% composite showed the highest visible-light photocatalytic performance, and the corresponding reaction rate constant reached as high as approximately 0.02605 min −1 , which was 5.97 times of ZnS 1-x QDs, 2.63 times of Ta 2 O 5-x , and far better than that of commercial Ta 2 O 5 . The main reactive species, photocatalytic mechanism and degradation pathways were also studied. The highly enhanced photocatalytic performance of the Ag/ZnS 1-x quantum dots/Ta 2 O 5-x composites could be mainly attributed to the formation of Ag modified S-scheme heterostructures and highly increased surface areas. Current work indicates a high-performance tantalum-based composite for dealing with persistent organic pollutants.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Xia Zhou,Xiaoling Lin,Haiqiu Huang,Ping Li,Jiamin Wu,Xueqin Huang,Huaihong Cai,Hai Han,Junxia Zheng,Haibo Zhou
Visual, highly selective, and sensitive detection of sulfur dioxide (SO 2 ) and its derivatives (SO 3 2- ) in vitro/in vivo is of great significance in maintaining cell homeostasis. A new Au@Ag@ZIF-8 optical sensor with o-phenylenediamine (OPD) internal coding surface-enhanced Raman scattering (SERS) tags based on the free radical reaction was synthesized for multi-mode detection of sulfite . First, Co 2+ is oxidized to Co 3+ . Second, the oxidoreduction between SO 3 2- and Co 3+ produces SO 4 -• and Co 2+ to complete the cycle. The resulting SO 4 -• is further reacted with the chromogenic substrate OPD to form the polymer. Due to the UV–vis absorbance of OPD polymer being stronger than that of OPD, but the fluorescence intensity is lower, and their Raman peaks are obviously different, this sensor can be used for the detection of SO 3 2- through colorimetric, fluorescence, and Raman multi-mode. The main advantages are as follows: (1) high selectivity; (2) achieve fast, visual, and highly sensitive detection of SO 3 2- , and the low limit of detection (LOD) is 1 nM; (3) improve the reliability of detection and expands the detection range (1 nM-800 μM); (4) demonstrate the applicability in recognizing SO 3 2- in HeLa cells to provide accurate information on the dynamic distribution of sulfur in cells.
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Acta Biomaterialia
·
2022
·
IF 10.633
Shibo Xu,Linna Chang,Xingjun Zhao,Yanan Hu,Yiyi Lin,Zhenhua Chen,Xiuli Ren,Xifan Mei
Osteoarthritis (OA), a widespread degenerative disease characterized by cartilage destruction, has emerged as a public health challenge in the current aging society. In addition to applied steroids and surgery, near-infrared (NIR) sensitive nano-enzyme for the treatment of osteoarthritis through mitochondrial repair and cartilage protection is attractive and promising. In this study, a NIR sensitive multifunctional heterostructure (EGCG (Epigallocatechin gallate) decorated Au-Ag nano-jars ( [email protected] )) was introduced as an enzyme-sensitive active nanoplatform for the treatment of osteoarthritis. Molecular biology results indicated that [email protected] possesses intrinsic properties of anti-oxidative stress and was able to reduce the apoptosis rate of chondrocytes by 83.3%. The area of the intra-articular joint cavity injected with [email protected] can be elevated to 46.6 °C under NIR to promote the release of EGCG further to induce cartilage regeneration. X-ray radiography and section staining showed that [email protected] reduced cartilage damage and decreased OARSI scores by approximately 52% after 8 weeks of treatment in a surgically induced OA model. The results demonstrated that this multifunctional enzyme-like nanoplatform with a synergistic NIR sensitive property to facilitate cartilage migration and regeneration repair provides a promising OA treatment strategy. Statement of significance 1. NIR-sensitive nano-enzyme is gaining much attention in the field of biomedical materials . 2. EGCG decorated Au-Ag nano-heterostructures were utilized as NIR-sensitive nano-enzymes for the treatment of osteoarthritis through mitochondrial repair and cartilage protection. 3. The obtained multifunctional Au-Ag nano-heterostructures are promising for osteoarthritis treatment.
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CHEMOSPHERE
·
2023
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IF 8.8
Yunlei Zhou,Zhuangzhuang Wang,Huanshun Yin,Xiaoting Cui,Ying Tian,Zhen Qiao,Suo Wang,Runye Hu,Wenjing Lv,An Mao,Jun Wang
2D Ag/BiOCl/Bi 2 O 2 CO 3 S-scheme heterojunction was prepared with oxygen vacancy (OVs) via one-pot hydrothermal method. The XRD and XPS analysis indicated the synthesized sample contained Ag nanoparticles (AgNPs) instead of Ag ions. The SEM and HRTEM pictures showed that BiOCl/Bi 2 O 2 CO 3 nanosheets were modified with AgNPs. Compared with AgNPs, BiOCl, and Bi 2 O 2 CO 3 , Ag/BiOCl/Bi 2 O 2 CO 3 exhibited highly photocatalytic inactivation of pathogenic fungi ( Fusarium graminearum ) due to the wide light absorption range and S-scheme heterojunction structure, which improved the production and transfer of photogenerated carrier, and enhanced the separation of photogenerated e − /h + pairs. In addition, the improved photocatalytic disinfection against Fusarium graminearum of Ag/BiOCl/Bi 2 O 2 CO 3 was verified in Sedeveria Letizia plant . Furthermore, active species capture assay and ESR experiments disclosed the involvement of OVs, h + , ∙O 2 − , ∙OH, and – for Fusarium graminearum destruction during photocatalysis process. The S-scheme heterojunction was proved via oxygen vacancy, which was extensively beneficial to increase charge transmission and separation efficiency. Our work proposed Ag/BiOCl/Bi 2 O 2 CO 3 was an efficient and ecological fungicide to inactive Fusarium graminearum in vitro and vivo for crop disease .
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4564-4574
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IF 2.1
Lu Jingmin,Qian Haoran,Ge Lei,Zhang Zhongcheng,Hao Hequn,Xu Zezhong,Yu Tingting,Li Minghua,Tian Changan,Xie Jinsong
In this paper, Ag/TiO 2 composites with different Ag doping ratios (0.5%, 1%, 2% and 3%) were prepared by a one-pot solvothermal method without post calcination. Glycine promoted the formation of rod-like TiO 2 growing along the (101) plane and introduced Ag nanoparticles (NPS) onto the surface of TiO 2 . A series of characterization tests, including x-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), x-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, nitrogen adsorption and desorption measurement, and electrochemical measurements were employed. The measurements confirmed that the formed Ag/TiO 2 nanorod composite with 1% Ag loading ratio (Ag/TiO 2 -1), consisting of length up to 22 nm and Ag nanoparticles (NPS) with a diameter of about 5.5 nm, had an appropriate energy band gap of 2.95 eV and a large specific surface area of 158.3 m 2 /g, which shows that the Ag/TiO 2 -1 has abundant photocatalytic active sites to increase its visible-light absorption ability. The Ag/TiO 2 -1 sample has the highest photocatalytic efficiency, with up to 95% and 98% degradation for tetracycline (TC) and Rhodamine B (RhB), respectively, in 25 min under simulated solar light. After the sixth cycle experiment, Ag/TiO 2 -1 still maintained 94% and 95% degradation of TC and RhB, respectively. The trapping active species experiment confirmed that the hole (h + ) and superoxide radical \(\left( { \cdot {\text{O}}_{2}^{ - } } \right)\) are the main active species. This work has practical significance for the simultaneous study of the photocatalysis of Ag/TiO 2 composites for dyes (RhB) and antibiotics (TC).
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 31
·15238-15251
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IF 3.553
Guan Lizhu,Weng Ling,Zhang Xiaorui,Wu Zijian,Li Qiong,Liu Lizhu
Two kinds of 1D core–shell nanorods silver@polydopamine (Ag@PDA) and silver@zinc oxide (Ag@ZnO) were successfully synthesized and doped into polyvinylidene fluoride (PVDF) to fabricate composites. The different surface modification effects between the organic PDA shell and inorganic ZnO shell on structure and dielectric properties of PVDF composites were investigated. Results indicated that the ZnO shell showed a crystalline structure, while the PDA shell is amorphous. Due to the difference in crystal structure of the coating shell, the Ag@ZnO/PVDF composites showed a better dielectric performance than the Ag@PDA/PVDF composites, while the Ag@PDA/PVDF showed excellent mechanical properties. The crystallized structure of ZnO not only promoted the crystal conversion of PVDF molecules, but also effectively limited the movement of charge carriers in composites. In the case of 10wt% fillers' content and before breakdown strength, the energy storage densities of Ag@PDA/PVDF and Ag@ZnO/PVDF composites are 79.53% and 209.2% higher than that of pure PVDF films, respectively. Moreover, the charge/discharge efficiency of Ag@ZnO/PVDF composite is also higher than that of pure PVDF and Ag@PDA/PVDF composite. When testing at 1800 kV/cm electrical strength, the energy storage density of Ag@ZnO/PVDF composite increases to 4.02 J/cm 3 .
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14180-14188
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IF 3.288
Jingjing Zhang,Jingtao Dai,Jian Chen
To compare photodegradation processes in single- and binary-contaminant systems, a representative antibiotic (tetracycline) and insecticide (imidacloprid) were employed as two contaminants of emerging concern. Ag/AgBr modified BiOBr was synthesized hydrothermally in an ionic-liquid/water medium and characterized via various techniques to support mechanistic studies. As-prepared flower-shaped Ag/AgBr/BiOBr exhibits superior photocatalytic activity to Ag/AgBr and BiOBr. Parallel experiments were conducted in single-contaminant systems to optimize the solution chemistry for comparison studies; these suggested that the photodegradation rate (DR) is highest at 1.0 g L−1 at catalyst dosages ranging from 0.6 to 1.4 g L−1, while raising the initial concentration reduces the DR. Additionally, electrostatic interactions between the reactants and photocatalyst cause DR fluctuations at different pH values. In the mechanistic studies, the contributions of the dominant active species (˙O2− and h+) were analysed quantitatively through quenching tests with scavengers. Furthermore, electrostatic interactions between the reactants and the active species result in non-equilibrated contributions from ˙O2− and h+ in single-contaminant systems. Comparison studies distinctly demonstrated a synergistic effect in binary-contaminant systems, which is caused by the mutually complementary utilization of h+ and ˙O2− during the photodegradation of tetracycline and imidacloprid.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Jun Zhang,Huan Yang,Shuang Pan,Hui Liu,Xiaoli Hu
In this study, a new “off-on-off” fluorescence strategy for detecting glutathione (GSH) and silver ions (Ag + ) is presented. The constructed nanoprobe is composed of B, N co-doped carbon dots (B, N-CDs) and manganese dioxide nanosheets (MnO 2 nanosheets), where MnO 2 nanosheets serve as a kind of efficient fluorescence quencher . The sensing mechanism of the system is based on the inner filter effect (IFE) and destruction-protection strategy. The assay strategy includes three processes: fluorescence quenching of B, N-CDs by MnO 2 nanosheets, the deconstruction of MnO 2 nanosheets by GSH, the combination between GSH and Ag + . The MnO 2 nanosheets are reduced to Mn 2+ because of the addition of GSH and restoring the fluorescence intensity of the system, while the formation of the complex between GSH and Ag + inhibit the reduction of MnO 2 nanosheets on account of the addition of Ag + , leading to the decrease in fluorescence of the probe. This strategy allows the quantitative detection of GSH and Ag + with detection limit of 0.32 μmol·L −1 and 0.24 μmol·L −1 , respectively. Moreover, this approach displays good sensitivity, selectivity and broad linear range, which could be broadly applicable for practical applications.
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