INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
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IF 3.671
Chao Liu,A.M. Omer,Xiao-kun Ouyang
In the present study, new composite beads based on carboxymethyl cellulose (CMC)/k-carrageenan (kC)/activated montmorillonite (AMMT) were prepared for adsorptive removal of cationic methylene blue (MB) as a dye model. The structure and morphology of the composite beads were investigated by FT-IR and SEM, while the thermal properties were tested using TGA. Factors affecting the removal percent of MB such as CMC/kC/AMMT ratios, initial MB concentration, pH medium, adsorbent dosage, solution temperature, and agitation speed were also explored. Results demonstrated that MB removal (%) exceeded 92% after 120 min using CMC/kC/AMMT (1:1:0.4 ratio) compared to 69% in case of free AMMT beads. Moreover, data obtained from isotherm studies were fitted well to Langmuir model (R 2 = 0.999), and the kinetics of adsorption followed pseudo-second order model. Finally, the composite beads showed good reusability for MB dye removal with high efficiency. Results obtained from this study suggest that the prepared composite beads could be applied effectively for removing cationic dyes from aqueous solutions.
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Analytical Methods
·
2024
·
IF 2.7
Linghui Tang,Yufeng Huang,Zhihuan Qian,Jifan Zhao,Yasushi Hasebe,Yan Dong,Yue Wang
In this study, a self-assembled electrochemical sensor was prepared by coating with a carbon nanotube (CNT) decorated hydrogel (HG) combined with electrodeposition of methylene blue (MB), and then used for the detection of ascorbic acid (AA). The three-dimensional network of HG has the advantages of large electroactive surface area, rapid diffusion and electron transfer rate, strong adhesive ability and stabilization of the polymerized MB. The MB provides high electrocatalytic activity and works as an electron transfer mediator to facilitate the oxidation of AA. The successful synthesis of the hydrogel and the preparation of the sensor are confirmed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The layer-by-layer assembly was identified by AFM with the heights of 22.1 nm and 186.8 nm for the hydrogel and MB layers, respectively. Under the optimal conditions, the sensor has a linear range of 0.1 mM to 10 mM and a detection limit of 0.05 mM. What's more, the prepared sensor also exhibits good stability (current retention of 91.22% after 100 cycles for testing 0.25 mM AA), excellent anti-interference ability, good reproducibility (RSD of 4.26% for five independent experiments), excellent operational stability (RSD of 1.66% for 30 consecutive AA additions), fast response time (<4 s) and shows satisfactory results in the detection of AA in vitamin C tablets.
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RSC Advances
·
2015
·Vol. 5
·期 38
·30268-30274
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IF 3.84
Xiaopeng Huang,Yuqin Li,Xiang Huang,Yaowen Chen,Wenhua Gao
An ingenious sensing strategy for detecting thrombin in human serum has been developed on the basis of a hairpin DNA sequence and resonance light scattering (RLS) technique. A thrombin aptamer sequence was embedded inside the hairpin DNA strand (H-eTBA), which was designed to be the loop-stem structure. Moreover, methylene blue (MB) was utilized as the RLS signal indicator according to its different affinity to single or double stranded DNA. Upon the addition of thrombin, the thrombin aptamer inside H-eTBA interacted specifically with thrombin. Thus the conformation of H-eTBA would change. After the introduction of the DNA strand (CTBA), which was complementary to H-eTBA, the amount of double stranded DNA would decrease as a consequence. Later when MB solution was added, the RLS signal would present various response values based on different amounts of thrombin. The determination of thrombin in human serum could be obtained with a detection limit of 0.32 nM and this specific sensor could be applied to detect thrombin practically. Furthermore, this aptasensor showed quite good selectivity and simplicity toward thrombin. Finally, the proposed sensing method showed its superiority with selectivity and practicability, which could be used as a simple platform for thrombin detection.
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APPLIED ENERGY
·
2014
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IF 5.261
Zhen Wang,Yiping Wang,Marta Vivar,Manuel Fuentes,Li Zhu,Lianwei Qin
The SOLWAT system is a combined system for solar water purification and renewable electricity generation. Its photovoltaic and photocatalytic performance, along with the photovoltaic (PV) electricity production was studied under the degradation of three different pollutants: Methylene Blue, Acid Red 26 and 4-Chlorophenol in present paper. The spectrum loss of the system was analyzed theoretically. Spectral transmittance experiments with different medium were conducted and compared with the results of outdoor experiments. The photovoltaic performance of the SOLWAT system was studied comparatively by measuring the P m and I sc under actual climatic conditions with a reference PV system. To investigate the photocatalytic performance of the SOLWAT system, the degradation of sample pollutants were detected by analyzing the UV absorption and the TOC. In the presence of the additional wastewater layer, PV cells in the SOLWAT system could work under lower temperature. Depending on the spectral absorption of pollutants, if it is within the spectral response of the PV cell, the electricity output is affected by the pollutant degradation (Methylene Blue, Acid Red 26). When the spectral absorption of pollutant is out of the spectral response of the cell, the PV output is not affected by the contaminant degradation (4-Chlorophenol). The output power of SOLWAT system, though decreased due to the light absorption, was sufficient to drive the whole system. The degradation of sample pollutants was detected by analyzing the UV absorption and the TOC to investigate the photocatalytic performance of the SOLWAT system. For the wastewater with different initial concentrations, the decolorization rate ran up above 99% and the mineralization rate was above 80%.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 3
·621-628
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IF 2.279
Ma Xinying,Chao Mingyong
A novel poly(methylene blue)/graphene composite glassy carbon electrode was fabricated and the electrochemical behavior of maltol at the modified electrode was studied by cyclic voltammetry. In phosphate-buffered solution, the modified electrode exhibited excellent electrocatalytic activity towards the electrochemical oxidation of maltol. Under optimized conditions, the oxidation peak current showed a linear relationship with the concentrations of maltol in the ranges of 8.00 × 10 −7 to 4.00 × 10 −5 and 4.00 × 10 −5 to 5.40 × 10 −4 mol L −1 , with a detection limit of 6.50 × 10 −8 mol L −1 . The performance of the developed method was validated in terms of linearity ( r = 0.9981 and 0.9955), recovery (97.0−99.3 %), reproducibility (relative standard deviations ≤ 3.1 %, n = 6), and robustness. The method shows excellent sensitivity, selectivity, and reproducibility and has been successfully applied to analyzing maltol in a wide variety of food products.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·
IF 2.8
Fu Xiaolei,He Yan,Guo Zhulei,Chen Mingfan,Du Wenlong,Zeng Yuqin,Yuan Dingzhong,Na Bing
In this work, we designed and synthesized two novel bi-heteroatom functionalized hyper-crosslinked porous polymers (HCP-CT and HCP-CF) through a simple one-step Friedel–Crafts alkylation reaction. The resulted polymers N/S bi-heteroatom functionalized polymer HCP-CT and N/O bi-heteroatom functionalized polymer HCP-CF both have good adsorption property for organic dyes such as methyl orange (MO) and methylene blue (MB) in aqueous solution due to its rich pore structure, high specific surface area and rich-heteroatoms of pore surface. It is worth mentioned that the maximum adsorption capacity ( q max ) of cationic dye MB by the porous polymer HCP-CT at room temperature was reached up to 1571.46 mg/g, which is much higher than that of most reported porous materials. Furthermore, the adsorption capacity of HCP-CT for the cationic dye MB was more than seven times that of the anionic dye MO ( q max = 212.77 mg/g). Also, the polymer HCP-CF for the MB adsorption capacity ( q max = 352.11 mg/g) was more than twice higher than that of anionic dye MO ( q max = 131.75 mg/g). The above trends may be because of the stronger electrostatic interaction between the negatively charged N-S/O bi-heteroatom of HCP-CT and HCP-CF with the cationic dye MB than that of MO. In addition, the removal percentage of polymers HCP-CT and HCP-CF still remained above 80% after five adsorption–desorption cycles. Hence, this work may provide a convenient synthetic route to develop a novel hyper-crosslinked polymer with high capacity for the entrapment of dyes from aqueous solution.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Linyu Zhang,Qianqi Li,Yingqi Liang,Guoguang Zhang,Jinmei Zou,Peng Fei,Wenqiang Lai
Chitosan, as a biomaterial, has increasingly garnered attention. However, its limited solubility in water—only dissolving in certain dilute acidic solutions—substantially restricts its broader application. In this investigation, chitosan underwent a solubilization modification to acquire water solubility, facilitating its dissolution in neutral aqueous mediums. Subsequently, this water-soluble chitosan (WSC) was interlinked with oxidized carboxymethyl cellulose (OCMC), characterized by varied oxidation extents, to synthesize hydrogels. Structural characterization verified the formation of imine bonds resulting from crosslinking interactions between the amino groups of water-soluble chitosan and the aldehyde groups of oxidized carboxymethyl cellulose. Employing performance characterization analysis, it was discerned that an increase in the oxidation level of the oxidized carboxymethyl cellulose corresponded to a denser hydrogel network architecture and the hardness increased from 3.01 N to 6.16 N. Moreover, the capacity of these hydrogels to adsorb methylene blue was meticulously examined. Notably, the hydrogel denoted as WSC/66%OCMC manifested an adsorption capability of 28.08 mg/g for methylene blue. Analytical findings from adsorption kinetics and isotherm studies indicate that the adsorption mechanism of the WSC/66%OCMC hydrogel follows the pseudo-second-order kinetic model and corresponds to the Freundlich isotherm model.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 6
·2455-2476
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IF 2.8
Yan Jia,Hu Cheng,Zhang Lianhong
Graphitic carbon nitride (g-C 3 N 4) faces limitations in its photocatalytic applications due to its inherently wide bandgap (2.7 eV), low utilization of visible light, and a high rate of recombination of photogenerated electron–hole pairs. Defect engineering can effectively enhance the ability of g-C 3 N 4 photocatalysts to address environmental pollution. In this paper, g-C 3 N 4 materials with N defects (AA-CN15) were successfully prepared by using urea as a hydrogen bond donor and ammonium acetate as a hydrogen bond acceptor. The catalyst exhibits a broader range of visible light absorption, a lower rate of photogenerated electron–hole recombination, and a larger specific surface area, thanks to the formation of N defects in the N1 (C=N–C) vacancy. The formation of N defects reduces the band gap width of AA-CN15 from 2.85 eV to 1.90 eV compared to U-CN. The degradation rate of AA-CN15 in a 30 mg/L MB solution under visible light irradiation can reach 91.4% within 100 min, which is 7.2 times higher than that of U-CN. This study addresses the limitations and drawbacks of traditional defect introduction methods, offering a novel approach for the synthesis of N defect g-C 3 N 4 materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fuying Pei,Bohan Yin,Hongge Jia,Lijia Liu,Yutong Shan,HongjinWang
The development of multifunctional nanofiber membranes with high separation efficiency for the simultaneous removal of oil–water emulsions and organic dyes is essential due to the complexity of hazardous components in real wastewater. Herein, a polyimide (PI) fiber membrane prepared by electrospinning was carboxylated and used to simultaneously separate oil-in-water emulsions and methylene blue (MB) dye for the first time. A superhydrophilic/underwater oleophobic electrostatically spun carboxylated polyimide (Cx-PI) fibrous membrane was successfully prepared through electrostatic spinning, thermal imidization, and alkaline hydrolysis to construct carboxyl and imide groups on the polyimide fibrous membrane. The resulting membranes exhibited excellent performance in gravity-driven separation for the effective removal of oil, oil-in-water emulsions, and MB dye. The separation efficiency was ≥ 99.4 % for oil-in-water emulsions stabilized with various surfactants with a flux of up to 1128.5 L m −2 h −1 . In addition, the oil and dye in the emulsion could be simultaneously separated with an emulsion separation efficiency of ≥ 99.2 %, a flux of about 910.6 L m −2 h −1 , and an MB dye removal rate of 98.6 %, even when the MB dye concentration was as high as 100 mg/L. The Cx-PI nanofiber membrane also demonstrated excellent stain resistance, salt resistance, high-temperature resistance, and mechanical durability. The above results indicated that the Cx-PI membranes were suitable for the separation of oil-in-water emulsions containing MB dyes under complex conditions. This study provides a promising application in solving the global water pollution caused by oily organic solvents and water-soluble dyes.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shang-yu Chen,Liang Li,Mai Feng,Ting Huang,Nan Zhang,Yong Wang
Enhancing the hydrophilicity/underwater superoleophobicity of fibrous membranes not only boosts their anti-contaminant property during oil/water separation, but also enhances their removal ability toward water-soluble pollutants. Here, a novel kind of electrospun polysulfone/titanium dioxide (PSF/TiO 2 ) composite membranes with UV-activated superwetting ability were fabricated by depositing spherical TiO 2 nanoparticles on the surface of PSF electrospun fibers through hydrothermal reaction . After activated by UV irradiation, the PSF/TiO 2 composite membranes (FPT-A-UV) exhibited amphiphilic features with water contact angle (WCA) and oil contact angle (OCA) approaching 0° in air while under-water oil contact angle (UWOCA) and under-oil water contact angle (UOWCA) exceeding 150°, respectively. The composite membranes showed high removal ability toward methylene blue (MB). Under the complex condition in purifying the emulsion containing MB, the removal ratio of MB achieved 90.8 % with water flux of 780.3 (L m −2 h −1 ). The FPT-A-UV composite membranes also exhibited good demulsification effects on various emulsified solutions. It is reasonable to expect that the composite membrane has satisfactory application prospects in wastewater purification, especially in harsh environments.
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Analytical Methods
·
2025
·
IF 2.6
Shuxian Ren,Jihong Fu,Guoqi Liu,Haipeng Zhang,Boshen Wang,Junli Yu
The unreasonable use of organic dye leads to excessive residues in environmental water, which seriously threatens human health and the natural environment. In this paper, a spherical flower-like magnetic Fe3O4@CoNi layered double hydroxide@silver nanoparticle (Fe3O4@CoNi LDH@Ag NPs) SERS substrate was successfully fabricated via electrostatic self-assembly and applied for the sensitive detection of methylene blue (MB) in environmental water. The rapid concentration and separation of the SERS substrate from the water sample could be achieved using an external magnet. The Fe3O4@CoNi LDH@Ag NPs could not only rapidly enrich the trace analytes because of their outstanding absorptive capacity but also effectively enrich the cationic dye molecules to the “hot spots” through electrostatic interactions, resulting in higher SERS selectivity. Excellent SERS performance was observed, which exhibited a high enhancement factor (EF) of 5.81 × 108 and a low detection limit (LOD) of 1 × 10−11 mol L−1 with R6G as the probe molecule, and also possessed exceptional reproducibility and stability for at least 28 days. The Fe3O4@CoNi LDH@Ag NPs were used to detect MB, which displayed wide linearity (1 × 10−10 to 1 × 10−4 mol L−1) and high recoveries (89.68–103.72%). This Fe3O4@CoNi LDH@Ag NP substrate offers easy separation and selective detection of cationic dyes, providing potential application for the detection of environmental contaminants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ting Zhang,Yang Liu,Jingjing Zhang,Jiaojiao Qiao,Xiaohui Yang,Tingting Li,Yi Wang
In this study, attapulgite (ATP) was made to unfolded in two-dimension on the surface of graphene oxide (GO) and metal oxides were loaded on it as active substances to prepare a multifunctional membrane material (Fe-Cu/ATP-GO) through an innovative pizza-like preparation method. The fabrication process of this composite membrane has undergone rigorous optimization to ensure optimal performance. In order to get insights into its structural and compositional features, the composite membrane was thoroughly investigated by XRD, FTIR, SEM, BET analysis, XPS, and TG, which showed ATP was uniformly dispersed on the surface of GO membrane and both Fe and Cu were successfully and uniformly loaded on the surface of ATP-GO membrane. The application of the Fe-Cu/ATP-GO membrane in treating wastewater contaminated with methylene blue (MB) or ciprofloxacin (CIP) showed over 90 % removal ratio of MB and over 70 % removal ratio of CIP after 10 min dynamic treatment experiments under optimal conditions, revealed its exceptional ability to effectively eliminate organic contaminants from water. Further mechanistic studies have shed light on the multifaceted treatment mechanisms employed by the composite membrane, including filtration, adsorption, and catalytic oxidation, etc. These mechanisms synergistically contribute to the membrane’s remarkable performance in removing refractory organics from water.
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