TALANTA
·
2016
·
IF 4.035
Lu Hong,Jing Wan,Xiaojun Zhang,Guangfeng Wang
In this work, a highly sensitive electrochemical DNA methyltransferase (MTase) activity assay was fabricated with DNA–gold nanoparticles (Au NPs) network as signal amplification unit and an easy assembly method by the linkage of benzenedithiol bridge. By two complementary AuNPs modified single-stranded DNA, DNA–gold nanoparticles network was self-assembled. With the linkage of benzenedithiol bridge, the DNA network structure was immobilized on the surface of gold electrode through the covalent Au–S bond. In the presence of Dam MTase, the special sites of DNA–AuNPs network were methylated and could not be digested by restriction endonuclease Mbo I. Thus the loaded electrochemical indicator Methylene blue (MB) was MB molecules still remained on the DNA–Au NPs network. The electrochemical response depended on the methylated degree, which could be used to detect MTase activity. By the differential pulse voltammetry (DPV), it was demonstrated that a linear relationship between the DPV response and logarithm of Dam concentration ranged from 0.075 to 30 U/mL, achieving a low detection limit of 0.02 U/mL. The use of benzenedithiol avoided the direct incubation of the solid electrode with the capture DNA probe under complex and harsh conditions. Therefore the immobilization of DNA–AuNPs network was easy to be carried out, which is favorable for the specially high stability and reproducibility of the electrochemical biosensor.
研究领域:
生物化学
·
分子生物学
·
纳米技术
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Water
·
2023
·Vol. 16
·期 1
·167
·
IF 3.4
Tiantian Chen,Jiayu Sun,Ruixue Jiang,Tongfei Zhang,Yulei Zhang,Xiaochen Li
Purified red phosphorus (RP) can be used as an adsorbent. However, the adsorption mechanism and reuse ability of purified RP have not been reported. This study utilized X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques (a statistical physics model and the standard molar free energy of formation) to investigate the adsorption mechanism of methylene blue (MB) by purified RP. Purification did not change commercial RP structure according to X-ray diffraction. The results showed that the adsorption process only included physical adsorption according to Fourier transform infrared spectroscopy and UV–vis diffuse reflection absorption spectra. The specific areas of commercial RP and purified RP were 0.02 cm3/g and 5.27 cm3/g, respectively. Thus, purified RP has a higher adsorption capacity compared with commercial RP. A statistical physics model showed that, as the temperature increased from 288 to 308 K, theqe,Dmandqsatof purified RP for MB increased from 179.87, 0.824 and 0.824 to 303.26 mg/g, 1.497 mol/kg and 1.497 mol/kg, respectively. The fitted values of ΔrSmθ, ΔrHmθand ΔrGmθwere 104.38 J·mol−1·K−1, −2.7 × 103J·mol−1and negative, respectively. Thus, according to adsorption energy, the adsorption of MB by purified RP was a spontaneous process, which was mainly driven by entropy increasing. Compared with neutral dye, the purified RP had higher adsorption ability for the cationic dye and anionic dye. As the purified RP dose increased from 30 to 150 mg, the adsorption capacity of purified RP increased. However, as the MB concentration and pH increased, the adsorption capacity of purified RP decreased. The purified RP had excellent reuse ability and high temperature desorption can be applied to obtain its reuse ability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Juan Zhao,Lixian Xu,Hao Zhang,Yuhong Zhuo,Yanan Weng,Shuang Li,Dinghua Yu
Recently, increased attention has been focused on antibacterial photodynamic therapy (APDT) to treat multidrug-resistant bacterial infection due to the antibiotic abuse. Methylene blue has been used as a kind of efficient and cheap commercial photosensitizer in APDT. However, due to high hydrophilicity, methylene blue is not able to be transcellular intaken and accumulated efficiently. To promote accumulation and APDT efficiency of methylene blue, lipopeptide surfactin-methylene blue complex has been prepared through electrostatic interaction. The complex under LED irradiation was found to effectively reduce 5.0 Log 10 CFU and 7.6 Log 10 CFU for P. aeruginosa and S. aureus , respectively. The bacterial reduction efficiency is slightly higher than free methylene blue. The photosensitizers accumulation and APDT targeting protein have been characterized by fluorescence spectroscopy, fluorescence microscopy and protein electrophoresis techniques. These results demonstrated that more surfactin-methylene blue complex could be accumulated more into the cell, and inactivate bacteria through destroying intracellular protein under LED illumination. In comparison, free methylene blue under light could inactivate bacteria through destroying membrane protein and lipid structures. These results would provide valuable insight for developing advanced clinical medicine and designing photo-drug for photodynamic therapy.
研究领域:
药学
·
微生物学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 34
·24838-24844
·
IF 3.9
Cheng Luo,Yan Li
Adsorption is a promising method for the treatment of wastewater from the dyestuff industry due to its simplicity, high efficiency, low energy consumption and no secondary pollution. The capacity to separate adsorbents in a timely and efficient manner is a crucial factor in industrial applications. One-dimensional magnetic chains modified with polydopamine and in situ generated Ag nanoparticles (MC@PDA–Ag) were fabricated as highly regenerable adsorbents for methylene blue (MB). The magnetic chains were characterized by scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, nitrogen adsorption/desorption, X-ray photoelectron spectrometry, X-ray diffraction and magnetometry. The adsorption and catalytic degradation of MB by the materials were investigated. The regeneration capacity of MC@PDA–Ag was also evaluated. The specific saturation magnetization of MC@PDA–Ag is 38.2 emu g−1. The adsorption capacity of MC@PDA–Ag remained 76% of the initial value after 12 cycles of adsorption and elution. The novel adsorbents, which integrate adsorption and catalytic degradation, are anticipated to facilitate the development of magnetic adsorption materials for the remediation of dye pollution.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 9
·6489-6496
·
IF 1.483
Chen Yun-Xia,Li Ru-Chang,Zhang Yuan-Hu,Chen Xue-Gang,Ye Ying
Halloysite/MnFe2O4 nanocomposites have been proposed as a novel material which can be used in magnetic and electromagnetic applications. In this study, we fabricated two kinds of halloysite/MnFe2O4 nanocomposites. The XRD and TEM characterizations
suggested that ferrite nanoparticles were mainly adhered on the outer surface of HNTs (named as WMH) and in the inner wall (MH), respectively. Both MH and WMH were applied to adsorb methylene blue (MB) from aqueous solutions. The results indicated that both MH and WMH can remove more than
97% MB at a dosage of 2 g L−1 and initial MB concentration of 20 mg L−1. The adsorption processes by both nanocomposites fit pseudo-second-order kinetic model and Langmuir isotherm with correlation coefficient of >0.99. WMH (19.19 mg g−1)
shows slightly higher maximum adsorption capacity than MH (18.52 mg g−1), contradicts to the fact that the mesopore volume of MH is 30% larger than that of WMH. It can be reconciled by the strong bonding between the outer surface ferrite nanoparticles of WMH and the MB molecules,
which greatly enhanced the MB adsorption capacity. In addition, the dimethylamino groups of MB molecules were preferably removed, suggesting the MB degradation by the ferrite nanoparticles during adsorption. Furthermore, both WMH and MH can be easily magnetic separated and recycled. The MB
removal efficiency can be maintained at after regenerated for 5 times. Ascribed to the advantages of easily recycling and regeneration, low cost, and MB degradation, the halloysite-MnFe2O4 nanocomposites are potential environmental friendly adsorbents for removing organic
pollutants.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Qi-Su Huang,Wei Wei,Jing Sun,Shun Mao,Bing-Jie Ni
In this study, novel hexagonal K2W4O13 (h-K2W4O13) nanowires were strategically synthesized via a facial hydrothermal method, which exhibited excellent adsorption capacities for wastewater treatment. The inorganic agent K2SO4 was used as a structure-directing agent to scaffold the tunnel structure of h-K2W4O13 and form the one-dimensional structure. Through increasing the relative molar ratio of K2SO4 to Na2WO4 precursor, the pure-phase h-WO3 nanorods and h-K2W4O13 nanowires were obtained, attributing to the competitive electrostatic adsorption between K+ ions and Na+ ions on h-WO3 nuclei. With a smaller hydrated radius in the solution (dK+ = 3.31 Å, dNa+= 3.58 Å), K+ exhibited superior affinity compared to Na+ with the negatively charged h-WO3 nuclei because of a larger charge density, resulting in the formation of h-K2W4O13. Adsorption experimental results showed that 89.4% of methylene blue was removed by h-K2W4O13 in the first 5 min (99% in 1 h) and the maximum uptake capacity reached 204.08 mg g–1. In addition, the novel h-K2W4O13 exhibited acid or alkali resistance and good reusability, revealed by the stable adsorption capacity in a wide pH range of 3.0–11.0 and five-run recycle tests. The large specific area, high proportion of effective pore volume, and abundant hydroxyl groups of the synthesized h-K2W4O13 resulted in excellent adsorption performance for methylene blue.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
RSC Advances
·
2022
·Vol. 12
·期 33
·21056-21065
·
IF 4.036
Jie Jiang,Na Xie,Yilan Jiang,Jinghua Han,Guoying Feng,Zhongbing Shi,Changtao He
A new strategy was established for the degradation of wastewater-based organic pollutants. Laser-induced plasma (LIP) was used as an alternative UV light source to realise rapid photodegradation of methylene blue (MB), an organic pollutant. A conventional 1064 nm Nd:YAG laser was used for plasma excitation to degrade MB solutions. The results show that the LIP effectively degraded the organic matter, and the degradation efficiency was related to the UV component with wavelength less than 400 nm. The compositions of the plasma excited by different dielectric substrates are different owing to various mechanisms involving moderate heat dissipation and sonoluminescence. However, metallic substrates, especially Fe, can enhance the proportion of UV light and accelerate the degradation efficiency. In the process of methylene blue degradation, solution parameters, such as initial dye concentration, pH, irradiation time and hydrogen peroxide concentration, will affect the degradation efficiency. The conditions of effective degradation of methylene blue (10 mg L−1 MB−1 concentration, 50 mL L−1 H2O2 concentration, pH = 3 and P = 60 mW) were obtained in this study, which can provide reference for practical application.
研究领域:
环境科学
·
光化学
·
废水处理
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 12
·1137
·
IF 4
Yilin Cao,Lan Xu
In this work, hollow-structured nanofibers with densely and uniformly distributed ZnO nanorods were successfully prepared by a combination of coaxial electrospinning, heat treatment, and hydrothermal synthesis, exhibiting excellent photocatalytic degradation performance. The morphological and structural characteristics of hollow ZnO nanofibers obtained at different heat treatment temperatures were systematically investigated, and their photocatalytic degradation performances were compared through degrading methylene blue (MB) under ultraviolet (UV) irradiation. It was found that the hollow ZnO nanofibers obtained by heat treatment at 280 °C exhibited the best photocatalytic degradation performance due to their optimal morphology and structure. Their photocatalytic degradation efficiencies for MB under 3 h of UV light and natural sunlight were 94.70% and 92.95%, respectively. Furthermore, cyclic stability tests were conducted on the optimal sample, revealing that its degradation efficiency remained at 89.96% after three cycles, demonstrating its excellent reusability.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 4
·431
·
IF 2.9
Kaili Wang,Li Fan,Hongliang Zhu,Hao Liu,Yuxuan Wang,Shancheng Yan
In important applications, thermoelectric technology has been widely applied for precise temperature control in intelligent electronics. This work synthesized and characterized low-content copper-doped SnSe thermoelectric catalysts using an easy and effective hydrothermal method. It was discovered that doping increased the crystal plane spacing of SnSe, increased the carrier concentration, and improved the thermoelectric properties. The best degradation was attained at x = 0.0025. The thermoelectric degradation performance of low-dose copper-doped tin selenide Sn1−xCuxSe (x = 0, 0.0005, 0.001, 0.0015, 0.002, 0.0025, 0.003), for the degradation of methylene blue from organic wastewater at 75 °C, was examined. Our research indicates that by using this approach, we can create more high-performance catalysts.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2025
·
IF 2.5
Ziyi Chen,Jie Sheng,Keyu Ren,Yishan Song
The escalating environmental burden caused by industrial wastewater has prompted increasing attention towards the development of green, cost-effective, and high-efficiency treatment technologies. In this study, a novel composite hydrogel adsorbent was rationally designed using the natural biopolymer sodium alginate (SA) as the matrix, crosslinked with low-cost agents – glutaraldehyde and polyethyleneimine (PEI) – and reinforced with montmorillonite (MMT), an inexpensive inorganic filler, to enhance structural integrity. The resulting SA-MMT-PEI hydrogel was successfully synthesised and employed for the adsorption of methylene blue (MB) dye. The material’s removal capacity for methylene blue (MB) dye was systematically evaluated, including both static adsorption and dynamic adsorption studies to simulate wastewater treatment. Under the optimal dynamic adsorption conditions, the maximum adsorption capacity reached 148.61 mg·g−1. Notably, this work introduced the concept of ‘unit-cost-based maximum adsorption capacity’ as a novel and comprehensive evaluation metric, integrating material performance and economic feasibility. The SA-MMT-PEI hydrogel demonstrated a value of 842.93 mg/$, markedly surpassing previously reported adsorbent materials. This metric provides a practical framework for the cross-comparative assessment of diverse adsorbents targeting identical pollutants, which highlights the application potential and economic viability of SA-MMT-PEI hydrogels for large-scale industrial wastewater treatment, offering insights for material selection and environmental engineering design.
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Li Yuhang,Zhang Yu,Dang Qian,Shi Yu,Zhang Chi
In this study, cellulose nanofiber (CNF)/polyvinyl alcohol (PVA)/Fe 3 O 4 hybrid gel beads were synthesized via a reversed-phase suspension method, followed by in situ co-precipitation of Fe 3 O 4 nanoparticles. The structural and morphological properties of the beads were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). FTIR analysis confirmed the successful incorporation of Fe 3 O 4 and interactions between CNF, PVA, and the nanoparticles. XRD patterns revealed the crystalline nature of Fe 3 O 4 , while SEM and TEM demonstrated a uniform dispersion of Fe 3 O 4 nanoparticles within the 3D porous network of the gel matrix. The catalytic performance of the hybrid beads was evaluated in the degradation of methylene blue (MB) using sodium borohydride (NaBH 4 ) as a reducing agent. The CNF/PVA/Fe 3 O 4 beads exhibited exceptional catalytic efficiency, achieving complete MB degradation within 6 min at room temperature. The synergistic effect between the well-dispersed Fe 3 O 4 nanoparticles and the porous gel structure enhanced reaction kinetics, demonstrating the material’s potential as an effective and reusable catalyst for dye degradation.
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产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 9
·1205
·
IF 4.9
Yaxuan Deng,Zenghui Li,Rui Wang,Yue Shi
In the present study, cellulose composite microspheres were synthesized based on the reversed-phase suspension method by introducing cellulose nanocrystals (CNCs) into polyacrylamide (PAM), followed by partial hydrolysis. Their adsorption performance for methylene blue (MB) dye in aqueous solution was investigated by varying the CNC content, pH value, and particle size of the microspheres, showing excellent removal efficiency and a good regeneration performance. In addition, the adsorption kinetics were determined in accordance with the quasi-secondary kinetic model, and the equilibrium isotherm performance followed the Langmuir adsorption model. This work provides a reliable experimental basis and solid theoretical foundation for the potential application of cellulose-based composite microspheres in the field of wastewater treatment. They are expected to represent a highly efficient adsorbent material and promote the development of related fields.
研究领域:
材料科学
·
环境科学
✓ 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）