ACS Omega
·
2020
·
IF 2.87
Rui Wang,Ming Guo,Yinglu Hu,Jianhai Zhou,Ronghui Wu,Xuejuan Yang
ZnO quantum dots and CuFe2O4 nanoparticles were synthesized by chemical precipitation. The ZCF composite was created by the solvothermal method. A new molecularly imprinted fluorescence sensor (ZCF@MB-MIP) with unique optical properties and specific MB recognition was successfully generated. ZCF@MB-MIPs were characterized by Fourier-transform infrared spectroscopy, transmission electron microscopy, and X-ray diffraction and were applied for the selective detection of methylene blue (MB). The optimal working time of ZCF@MB-MIPs was 15 min, and the optimal working concentration was 37 mg·L–1. The fluorescence intensity was linearly quenched within the 0–100 μmol·L–1 MB range, and the detection limit was 1.27 μmol·L–1. The imprinting factor of the sensor (IF, KMB-MIPs/N-MIPs) was 5.30. At the same time, a real-time monitoring system was established for the photodegradation process of MB, which had the effect of reflecting the degradation degree of MB at any given time. Hence, ZCF@MB-MIPs are a promising candidate for use in MB monitoring, and they also provides a new strategy for constructing a multifunctional fluorescence sensor with a high selectivity and photolysis function.
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高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Shao-Hua Wen,Hengyuan Zhang,Sha Yu,Junping Ma,Jun-Jie Zhu,Yuanzhen Zhou
Credible and on-site detection of organophosphorus pesticides (OPs) in complex matrixes is significant for food security and environmental monitoring. Herein, a novel COF/methylene blue@MnO2 (COF/MB@MnO2) composite featured abundant signal loading, a specific recognition unit, and robust oxidase-like activity was successfully prepared through facile assembly processes. The multifunctional composite acted as a homogeneous electrochemical and photothermal dual-mode sensing platform for OPs detection through stimuli-responsive regulation. Without the presence of OPs, the surface MnO2 coating could recognize thiocholine (TCh), originating from acetylcholinesterase (AChE)-catalyzed hydrolysis of acetylthiocholine (ATCh), and exhibited a distinctly amplified diffusion current due to the release of plentiful MB; while the residual MnO2 nanosheets could only catalyze less TMB into oxidized TMB (oxTMB) with a typical near-infrared (NIR) absorption, enabling NIR-driven photothermal assay with a low temperature using a portable thermometer. Based on the inhibitory effect of OPs on AChE activity and OP-regulated generation of TCh, chlorpyrifos as a model target can be accurately detected with a low limit of detection of 0.0632 and 0.108 ng/mL by complementary electrochemical and photothermal measurements, respectively. The present dual-mode sensor was demonstrated to be excellent for application to the reliable detection of OPs in complex environmental and food samples. This work can not only provide a complementary dual-mode method for convenient and on-site detection of OPs in different scenarios but also expand the application scope of the COF-based multifunctional composite in multimodal sensors.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Guohang Zhou,Hong Zhang,Zijian Bai,Jianyu Jiang,Yan Wang,Fengyu Quan
To address the limitations of gel-based adsorbents, such as inadequate mechanical strength, low adsorption capacity, and limited reusability, this study presents an innovative approach employing a dual network gel. The dual network consists of calcium alginate (CA) ionic crosslinked organic networks, and vinyl silica-based nanoparticles (VSNP) as crosslinking agents in acrylic acid (AA) free radical polymerization networks (denoted as P (AA- co -VSNP), abbreviated as PAV). After freeze-drying, ultimately yielding an organic/inorganic hybrid dual network gel (referred to as CA/P(AA-co-VSNP), abbreviated as CPAV), enriched with abundant functional groups, thereby enhancing material reusability. To further enhance the adsorption capacity, CPAV undergoes hydrothermal reactions to obtain metal-organic frameworks (MOFs) composite dual network gel adsorbent (UiO-66@CPAV). UiO-66@CPAV exhibited a density of 0.165 g/cm 3 and showcased a unique pore structure with nested macropores and mesopores, featuring a uniform distribution of pore holes. Notably, the specific surface area was measured at 96.3 m 2 /g, and an average pore diameter was 17.9 nm. Most impressively, the actual maximum adsorption capacity reached 841.7 mg/g, and even after 10 cycles of use, the adsorption capacity remained 91.9 % of its initial value. Overall, this research introduced a novel methodology for the development of dual network MOFs@gel adsorbents, showcasing promising advancements in the field.
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TALANTA
·
2023
·
IF 6.1
Dan Luo,Zaiqiong Liu,Aiwen Su,Yanli Zhang,Hongbin Wang,Lijuan Yang,Wenrong Yang,Pengfei Pang
T4 polynucleotide kinase (T4 PNK) is an important DNA repair-related enzyme that plays a crucial role in DNA recombination, replication and damage repair. Herein, an electrochemical biosensor was developed for detection of T4 PNK activity and inhibitor screening based on supramolecular host–guest recognition between phosphate pillar (Dumitrache and McKinnon, 2017) [5] arene (PP5) and methylene blue (MB). The water-soluble PP5 employed as the host for complexation of MB guest molecules. The substrate DNA with 5′-hydroxyl group was first self-assembled on the gold electrode surface through the chemical adsorption of the thiol group , which was phosphorylated in the presence of T4 PNK and adenosine triphosphate (ATP). TiO 2 served as a bridge to link phosphorylated DNA and PP5 via the robust phosphate-Ti 4+ -phosphate chemistry . The immobilized PP5 captured the MB on electrode surface via the supramolecular host–guest recognition interaction, resulting in an enhanced electrochemical response signal. The electrochemical signal is proportional to the T4 PNK concentration in the range of 2 × 10 −4 to 5 U mL −1 with a detection limit of 1 × 10 −4 U mL −1 . It was also successfully used for PNK inhibitor screening and PNK activity assay in HeLa cell lysates sample. The proposed strategy provides a novel sensing platform for kinase activity assay and inhibitor screening, holding a great potential in clinical diagnostics, inhibitor screening, and nucleotide kinase-target drug discovery.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·
IF 3
Chunli Fu,Meng Zhou,Heqing Fu
The urgent problem to solve is how to design a kind of green and porous adsorbent that can effectively remove dye pollutants in the field of the sewage treatment. The objectives of this investigation are to incorporate zeolitic imidazolate frameworks-8 (ZIF-8) particles in situ onto the surface of multiwalled carbon tubes (MWCNTs) and integrate them into an agarose-sodium alginate (ASA) double network hydrogel. The resulting composite hydrogel beads, denoted as MWCNTs/ZIF-8/ASA (MZASA), are synthesized using calcium ion crosslinking. The addition of agarose is employed to create a dual-crosslinked hydrogel, thereby enhancing the mechanical properties of the ASA hydrogel. By incorporating MWCNTs/ZIF-8 nanoparticles, the surface area of the MZASA hydrogel is augmented, leading to an enhancement in dye adsorption capacity. In batch sorption mode, the maximum absorbency of the resulting hydrogel beads for methylene blue (MB) is 493.799 mg/g, which was a third greater than that of pure SA beads. Absorption of MB obeys the pseudo-second-order kinetic model and Langmuir isotherm model, suggesting monolayer chemisorption adsorption. Analysis of the thermodynamics proves that the entire adsorption process is exothermic and spontaneous. Moreover, the MZASA hydrogel beads show high selectivity for cationic dyes in the mixed dye test. Hence, the synthesized MZASA hydrogel beads serve as a highly effective, innovative, and reusable adsorbent for eliminating cationic dyes from water-based solutions.
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ChemistrySelect
·
2023
·Vol. 8
·期 18
·e202204785
·
IF 2.1
Tianhao Ma,Haixu Li,Xiaoguang Liu,Haobo He,Tiannan Jiang,Junsheng Wang,Bin Li,Wendong Xue,Shubin Ren,Jialin Sun
Graphical To activate peroxymonosulfate (PMS) and degrade dyes, composite catalysts containing cobalt, nitrogen-doped porous carbon and carbon nanotubes (CNTs) were prepared. The catalyst (CNT@ZIF-800) showed faster degradation rates towards congo red (98.5 %, 5 min) and slower rates towards rhodamine B (90.7 %, 30 min) than methylene blue (94.8 %, 30 min). It had 14.5 % more Co−Nx/pyridinic-N sites than C-ZIF-800. Such sites, together with cobalt and CNTs, had activated PMS into 1 O 2 , SO 4 − ⋅ and ⋅OH, which were primary and secondary dye degradation species. To activate peroxymonosulfate (PMS) and degrade methylene blue (MB), cobalt and nitrogen-doped porous carbon composite catalysts were prepared through pyrolysing zeolitic imidazolate framework ZIF-9 and dicyandiamide (DCDA) at 700–900 °C with various mass ratios. Powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller results showed that Co, porous carbon and carbon nanotubes (CNTs) co-existed in the catalyst prepared at 800 °C with a ZIF-9/DCDA ratio of 1 : 3. Thermogravimetric analysis suggested that CNT@ZIF-800 had a higher ratio of graphitic to turbostratic carbon than CNT@ZIF-700. It had degraded 94.8 % MB within 30 min, which was about 1.9 times faster than its counterpart C-ZIF-800. It also showed faster degradation rates towards Congo red (98.5 %, 5 min) and slower rates towards rhodamine B (90.7 %, 30 min) than MB. Furthermore, XPS revealed that it had 14.5 % more Co−Nx/pyridinic-N active sites than C-ZIF-800. EPR suggested that 1 O 2 might be the primary catalytic species whereas the SO 4 − ⋅ and ⋅OH the secondary ones. The formation mechanism of such active species might be originated from the synergistic activation of PMS by CNTs, Co−Nx/pyridinic-N and abundant Co sites in the CNT@ZIF-800. This work not only provided efficient Fenton-like catalysts for MB degradation, but also clarified the catalytic mechanism.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Qian Zhai,Jingde Luan,Xin Ke,Wengang Liu,Zheng Yan
Flash photodegradation of organic pollutants at high concentrations is an urgent need for industrial organic wastewater treatment. Situ high-energy wet ball milling is adopted to fabricate the vanadium-oxygen doped carbon nitride catalysts to implement the flash degradation of methylene blue (MB). The experimental results indicated that the photocatalyst degradation ratio of MB was higher than 90% in 3 min under visible-light irradiation 300 W, catalyst dosage 0.2 g/L and MB concentration of 100 mg/L. MB removal rate was nearly 20 times higher than that of primitive carbon nitride. Vanadium-oxygen doping was beneficial to the reduction of band gap less than 2.0 eV and the formation of built-in electric field. It is notable notice that both valence band and conduction band of catalyst were tuned to be in positive potential region, benefiting for holes (h + ) formation to boost the flash degradation of contaminants. Strong electrophilic attack of h + caused the bonds of C-S + =C and C N-C broken, triggering the aromatic ring opened to decompose into smaller molecules.
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Symmetry-Basel
·
2023
·Vol. 15
·期 7
·1334
·
IF 2.7
Guolin Song,Chengzhu Shen,David Bassir,Qiulin Li
In this study, a facile strategy of regulated self-assembly synthesis of Mn-MIL-100, using sodium acetate (CH3COONa) as a mono-dentate ligand capping agent (CA), was proposed. The as-prepared product is denoted Mn-MIL-100-CA. The coordination modulation of CH3COONa, led by its interference in the connectivity and symmetry of the metal centers and organic nodes, plays a vital role in the synthesis process. The crystallinity, morphology, topology, and properties of such MOF products were improved, since the self-assembly process of Mn-MIL-100-CA was promoted and regulated effectively. The materials were systematically characterized via XRD, SEM, N2isotherms, XPS, and TGA in terms of crystallization behavior, morphology, topology, chemical composition, and thermal and water stability. The ability of Mn-MIL-100 and Mn-MIL-100-CA to remove methylene blue (MB) from an aqueous solution was investigated using a UV–vis spectrophotometer. The results indicate that with the addition of a molar ratio of 50% CH3COONa, Mn-MIL-100-CA particles developed a regularly symmetrical morphology, i.e., ‘spherical pyramid-like structure’ crystals with a dimension of 2~5 μm. Their specific surface area and pore volume increased by 59.2% and 56.7%, respectively. The increased proportion of Mn3+implies reduced crystal defects and improved crystal structural order and integrity, and therefore an enhanced water stability. Mn-MIL-100-CA exhibited excellent adsorption performance towards MB from aqueous solution. The equilibrium adsorption value was as high as 1079.9 mg/g, which is 44.7% higher than that of Mn-MIL-100 without the addition of CA. The good adsorption capacity and excellent water stability mean that Mn-MIL-100-CA has great potential for the practical removal of MB dye pollutants from water.Keywords:metal organic frameworks;Mn-MIL-100;capping agent;symmetry;self-assembly;methylene blue adsorption
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuanming Tan,Zhongqiao Sun,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Xia Zhang
MOFs/polymer hybrid membranes combine the special surface activity of MOFs and the excellent carries nature of porous polymer and thus exhibit unexpected adsorption/separation performances in the solid-phase extraction. In this paper, a new kind of MOFs/polymer composite membrane , MIL-68(Al)/PVDF have been fabricated for the first time through blending the MIL-68(Al) nanoparticles and polyvinylidene fluoride (PVDF) casting solution and following the lyotropic phase transition. Some means such as SEM, XRD and FT-IR are used to character the structure of these hybrid membranes. The membrane performances including the hydrophilic/hydrophobic properties, membrane porosity and membrane water flux are also measured. The effects of doping amount of MIL-68(Al) on the structure and performances of MIL-68(Al)/PVDF hybrid membranes are discussed. Two persistent organic pollutants : p -nitrophenol (PNP) and methylene blue (MB) are chosen as main adsorption objects to evaluate the adsorption activity of MIL-68(Al)/PVDF hybrid membranes. The influences of various conditions on the adsorption activities are investigated in detail and the optimum adsorption conditions are determined. All the MIL-68(Al)/PVDF hybrid membranes exhibit enhanced adsorption capacity compared to pristine PVDF, and the adsorption activities of hybrid membranes are promoted continually with the increasing doping contents of MIL-68(Al). The adsorption thermodynamics analysis indicates that the adsorption process is mainly characterized by Langmuir monolayer adsorption and chemical adsorption . The coordination bonding formed between NO 2 of PNP and Al(III) of MIL-68(Al), and the acid-base interaction between the sulfur of MB and Al(III) of MIL-68(Al) may be responsible to the highest removal efficiency of PNP and MB. The good dynamics adsorption and regeneration performances indicate the prospect applications of these MOFs/PVDF hybrid membranes in the separation of organic contaminants from industrial waste water.
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Materials Today Communications
·
2019
·
IF 1.859
Vu Van Cat,Ngo Xuan Dinh,Le Thi Tam,Nguyen Van Quy,Vu Ngoc Phan,Anh-Tuan Le
In this work, we established a simple and cost-effective method of dispersing silver nanoparticles on the surface GO nanosheets using a one-pot hydrothermal process with the presence of polyvinylpyrrolidone (PVP) as both surfactant and reducing agent. The systematic effects of synthesis conditions on the microstructure and formation of silver nanoparticles on the surface of rGO nanosheets were studied. Notably, the high-crystalline silver nanoparticles with a size of 15 nm were uniformly dispersed on the surface of rGO nanosheets when synthesis conditions were optimized at hydrothermal temperature 160 °C, pH = 9 and 10 mM of silver nitrate precursor. Our analysis results indicate that the as-prepared rGO-Ag nanocomposites exhibit the highest SERS efficiency and good sensitivity with methylene blue organic dye and tricyclazole pesticide. These can be explained by the electron interactions between silver nanoparticles and graphene oxide, which makes unique material advantages for the highly effective detection of pollutant molecules in the environmental monitoring applications.
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ACS Omega
·
2018
·
IF 0
Yagui Gao,Rong Guo,Yao Feng,Lexin Zhang,Cuiru Wang,Jingwen Song,Tifeng Jiao,Jingxin Zhou,Qiuming Peng
The excellent physical and chemical properties of cyclodextrin polymer (poly-CD)/azobenzene-modified polyacrylic acid (PAA-Azo) binary composite hydrogels have been designed and prepared. The prepared hydrogels were subjected to a variety of characterizations, including scanning electron microscopy, ultraviolet spectroscopy, circular dichroism spectroscopy, infrared spectroscopy, rheological properties, and specific surface area tests. It was found that the obtained hydrogels have the cross-linked three-dimensional porous network nanostructures, and the formed composite poly-CD/PAA-Azo hydrogel can basically be shear thinned and have good recovery performance. A process of gel–sol transition can occur when the gel has a stimulatory response under UV light irradiation. In addition, such excellent properties of hydrogels exhibit different mechanisms in the adsorption of organic molecules that are harmful to the environment, such as bisphenol A (BPA) and methylene blue (MB). The polymeric hydrogel serves as novel adsorbent agents to adsorb BPA via host–guest interaction and anchor MB via electrostatic interaction and hydrogen bonding.
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ELECTROANALYSIS
·
2016
·Vol. 28
·期 7
·1489-1494
·
IF 2.471
Xia Hao,Na Li,Zhen Xu,Nian Bing Li,Hong Qun Luo
A novel electrochemical strategy for the detection of amantadine (AMD) has been developed based on the competitive host-guest interaction of AMD and methylene blue (MB) with β-cyclodextrin (β-CD). Due to the host-guest interaction, MB molecules can enter into the hydrophobic inner cavity of β-CD, and the MB/β-CD/poly(N-acetylaniline)/glassy carbon electrode displays a remarkable reduction peak due to MB. In the presence of AMD, competitive association to β-CD occurs and the MB molecules are displaced by AMD, resulting in a decrease of reduction peak current of MB. The difference value of the cathodic peak current showed a linear relationship with the AMD concentration.
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