ANALYTICA CHIMICA ACTA
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2020
·
IF 5.977
Yanyan Niu,Hui Xie,Guiling Luo,Yujiao Zhuang,Xianqun Wu,Guangjiu Li,Wei Sun
In this paper a photoelectrochemical (PEC) aptasensor based on specific recognition with conformational changed after the target Cd(II) identification was fabricated. A ZnO and reduced graphene oxide (ZnO-rGO) nanocomposite with enhanced PEC activity was designed as photoactive material. After the further incorporation of gold nanoparticles (AuNPs) with ZnO-rGO nanocomposite, the enhanced photocurrent signal could be detected owing to the localized surface plasmon resonance and good conductivity of AuNPs. In addition, AuNPs were used as anchors for immobilization of –SH modified aptamer S1. After that aptamer S2 was paired with S1 sequence to form complementary double stranded DNA (dsDNA) on the electrode surface. Methylene blue (MB) was acted as sensitizer and assembled in dsDNA structure to amplify photocurrent response. When Cd(II) was bound to the aptamer presented on the sensing interface, S2 specifically recognized and captured Cd(II), which resulted in the unwinding of dsDNA structure and the separation of MB molecules from the electrode surface with photocurrent response decreased. The photocurrent was detected by a double-working-electrode system, which used the modified electrode as the first working electrode and glassy carbon electrode (GCE) as the second working electrode. Dopamine (DA) was added to the electrolyte and acted as the electron donor , which could be oxidized on the modified electrode and reduced on the GCE to form a cyclic reaction, leading to the enhanced photocurrent response with improved photocurrent stability. This MB sensitized PEC aptasensor exhibited a high sensitivity with a detection limit of 1.8 × 10 −12 mol/L (3σ). Thus, a highly sensitive aptasensor with double-working-electrode detection method for Cd(II) determination were established and further applied to the water samples analysis.
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Catalysts
·
2019
·Vol. 9
·期 10
·848
·
IF 3.444
Cheng Gong,Shiyin Xu,Peng Xiao,Feifan Liu,Yunhui Xu,Jin Yang,Rui Li,Xuan Wang,Jun Du,Hailong Peng
A hybrid material of indium tin-oxide (ITO) wrapped titanium dioxide and reduced graphene oxide (ITO-rGO and TiO2) was prepared using a facile hydrothermal technique. TiO2nanorods were in situ grown on the surface of rGO (rGO and TiO2), and which was then assembled onto ITO substrate layer by layer with formation of a 3D structure. ITO-rGO and TiO2exhibit low charge transfer resistance at the electrode-electrolyte interface and have good photoresponsive ability. Methylene blue (MB) can be effectively adsorbed and enriched onto ITO-rGO and TiO2surface. The adsorption kinetics and thermodynamics of ITO-rGO and TiO2were evaluated, showing that the exothermic and entropy-driven reaction were the main thermodynamic processes, and the Langmuir isotherm was the ideal model for adsorption fitting. Meanwhile, ITO greatly improved degradation of rGO and TiO2because electrons can be collected by ITO before recombination and MB can easily enter into the 3D structure of rGO and TiO2. The highest photodegradation rate of MB reached 93.40% for ITO-rGO and TiO2at pH 9. Additionally, ITO-rGO and TiO2successfully solved the problems of being difficult to recycle and causing secondary pollution of traditional TiO2catalysts. Therefore, ITO-rGO and TiO2may be a potential photocatalyst for degrading organic pollutants in water.Keywords:ITO-rGO and TiO2;methylene blue;photocatalysis;adsorption;mechanisms
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BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2023
·Vol. 38
·期 1
·69-84
·
IF 1.2
Belete Tewabe Gebeyehu,Daniel Manaye Kabtamu,Temesgen Alehegne Tasew
In this study, kocho was prepared from pseudostem and corm of Ensete ventricosum (enset).The behaviors of kocho were examined by using FESEM, TGA, XRD and FTIR spectroscopy. The biosorption potential of kocho, a possible low-cost new biosorbent for the efficient removal of MB dye from wastewater was investigated. Biosorption experiments were carried out in batch mode to study the effects of biosorbent dosages (0.025-0.2 g), pH (2–10), initial concentrations of MB (10 to 100 mg/L) and contact time (10 to 120 min).The highest removal efficiency of methylene blue dye (94.2%) was recorded at optimum experimental conditions. Following the removal study, it was determined that the pseudo-second order kinetics (R2 = 0.997) and Langmuir isothermal (R 2= 0.996) models may well describe the MB dye biosorption process. Furthermore, this newly developed biosorbent was fairly recyclable up to five cycles without significant loss of re-adsorption efficiency (around 9.6% loss) between 1st and 5th cycle. Thus, the findings of this study revealed that a new kocho biosorbent derived from Ensete ventricosum can be used as a promising low-cost, environmentally friendly and efficient biosorbent for the rapid removal of MB from aqueous solutions.
KEY WORDS: Kocho, Ensete ventricosum, Biosorption, Methylene blue, Kinetics, Isothermal
Bull. Chem. Soc. Ethiop. 2024, 38(1), 69-84. DOI: https://dx.doi.org/10.4314/bcse.v38i1.6
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yu Wang,Fengwen Yan,Jie Wu,Zhijun Huang,Liuting Song,Shunda Yuan
The utilization efficiency of single atoms is limited by the active sites being buried in support. To maximize atom utilization, Cu single atoms are anchored on the external surface of g-C 3 N 4 nanofibers (CNNFs), which are fabricated by partial thermal decomposition and subsequent self-assembly in H 2 O. The abundant N and O-containing functional groups of CNNFs are vital for the loading of Cu. Benefited from the full utilization of Cu sites, CNNF-Cu exhibits excellent Fenton-like catalytic activity for Methylene Blue degradation. The reaction kinetic constant is more than 10 times higher than that of the traditional single-atom catalyst with Cu sites evenly distributed throughout the entire support. CNNF-Cu maintains most of its catalytic activity after five cycle tests, suggesting good stability. This work provides a convenient method to maximize the utilization of single metal atoms for catalytic applications.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yanxiao Yang,Yunfeng Guo,Zhe Qiu,Weihua Gong,Yonggui Wang,Yanjun Xie,Zefang Xiao
Metal-organic frameworks (MOFs) are characterised by high porosity levels and controllable structures, making them ideal adsorbents for wastewater. However, obtaining substrate materials with mechanical stability, excellent pore accessibility, and good processability for compositing MOF crystal powders to adsorb multiple pollutants in complex aqueous environments is challenging. In this study, porous MOFs@ modified cellulose sponge (MCS) composites were fabricated using MCS as a scaffold to provide anchoring sites for the coordination of Zr 4+ ions and further in situ synthesis of MOFs, namely UiO-66@MCS and UiO-66-NH 2 @MCS, which effectively removed heavy metal ions and organic dyes. MOFs@MCS composites exhibit excellent water and dimensional stability, maintaining the pore structure by ambient drying during reuse. Compared with UiO-66@MCS composite, UiO-66-NH 2 @MCS composite exhibited a higher adsorption capacity of 224.5 mg·g −1 for Hg 2+ and 400.9 mg·g −1 for methylene blue (MB). The adsorption of Hg 2+ onto the MOFs@MCS composites followed the Langmuir and pseudo-second-order models, whereas the Freundlich and pseudo-second-order models were more suitable for MB adsorption. Moreover, the MOFs@MCS composites exhibited excellent reusability and were selective for the removal of Hg 2+ . Overall, this approach effectively combines Zr-based MOFs with mechanically and dimensionally stable porous cellulose sponges, rendering the approach suitable for purifying complex wastewater.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Yifang Mi,Wenqiang Wang,Sen Zhang,Yalong Guo,Yufeng Zhao,Guojin Sun,Zhihai Cao
Biomass-based activated carbon (CBACs) was successfully prepared by pyrolysis-activation of Taihu cyanobacteria. When the impregnation ratio and activated temperature were 2 and 800 o C, respectively, the optimal CBACs possessed an ultra-high specific surface (2178.90 m 2 ·g −1 ) and plenty of micro-and meso-pores, as well as a high pore volume (1.01 cm 3 ·g −1 ). Ascribed to ultra-high surface area, π-π interaction, electrostatic interaction, as well as hydrogen bonding interactions, the CBACs displayed huge superiority in efficient dye removal. The saturated methylene blue (MB) adsorption capacity by CBACs could be as high as 1143.4 mg·g −1 , superior to other reported biomass-activated carbons. The adsorption was endothermic and modelled well by the pseudo-second-order kinetic, intra-particle diffusion, and Langmuir models. This work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.
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ChemistrySelect
·
2023
·Vol. 8
·期 10
·e202300511
·
IF 2.1
Yu Han,Jinxin Wang,Dawei Qi
Graphical In this paper, an environmentally friendly method for the fabrication of maize straw biochar modified with zinc oxide nanoparticles for the degradation of methylene blue (MB) as a model organic dye was presented. Employing a novel biochar-ZnO nanocomposite material, the high degradation performance was achieved, and propose the mechanism behind it. The enhancement of the biochar-ZnO degradation performance can be ascribed to the synergistic effect of the adsorption of MB and water molecules on porous biochar and the photocatalytic activity of ZnO. As the preparation method of biochar-ZnO nanocomposites is cost-efficient, fast, and environmentally friendly, it is expected the strategy can find its place in real-world applications for dye removal from water. As a new type of environmental functional material, biochar composites have become the focus of considerable interest in wastewater treatment research owing to their excellent adsorption and photocatalytic properties. However, the fabrication of cost-effective biochar composites with high photocatalytic efficiencies at low synthesis temperatures remains challenging. In this study, biochar was prepared using an environmentally friendly hydrothermal method at a low temperature with maize straw as the waste material, instead high costs pyrolysis process. Hexagonal zinc oxide nanoparticles were grown in and on the biochar framework using the chemical deposition method. The adsorption and photocatalytic degradation performance of aqueous methylene blue (MB) solutions were investigated. We demonstrated that the photocatalytic degradation performance of the biochar-ZnO composites was considerably higher than that of the most other reports. The degradation of the MB solutions (60 mg/L) reached 98.0 % in 240 min under low-power ultraviolet light (50 W) irradiation. We propose that the synergetic effect of the high adsorption of the porous biochar and the photocatalytic activity of ZnO led to a high degradation efficiency. This study provides theoretical and practical guidance for the preparation of photocatalytic composites obtained from waste biomass materials by a cost-efficient, fast, and environmentally friendly method, and the efficient degradation of dye pollutants in water.
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Carbon Letters
·
2023
·Vol. 33
·期 4
·1205-1215
·
IF 4.5
Yang Mannan,Fang Changqing,Su Jian,Zeng Huilin,Lin Qilang
In this study, waste corrugated paper was used as carbon precursor with KOH-NaOH mixture (mole ratio was 51:49 and the melting point is 170 °C) as activator to prepare porous carbon at different reaction temperature and different mass ratio of KOH-NaOH mixture/waste corrugate paper fiber. The micro-morphology, pore structure information and composition of porous carbon were analyzed, and the formation mechanism of pores was investigated. The effect of activator amount and pyrolysis temperature on the morphology and structure of porous carbon were studied. The adsorption capacity of porous carbon was evaluated with the methylene blue as model pollutant. The effect of adsorbent amount, adsorption time and temperature on the adsorption performance of the porous carbon were analyzed. The maximum specific surface area is 1493.30 m 2 ·g −1 and the maximum adsorption capacity of methylene blue is 518 mg·g −1 . This study provides a new idea for efficient conversion and utilization of waste paper. Graphical abstract
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JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1439-1448
·
IF 2.6
He Yan,Guo Zhulei,Chen Mingfan,Wan Sicheng,Peng Nan,Fu Xiaolei,Yuan Dingzhong,Na Bing
In this paper, a new type of carbazole-based hyper-crosslinked porous polymer (HCP-CP) was prepared through a very simple “knitted” method. The obtained novel polymer HCP-CP has a good adsorption property of methyl orange (MO) and methylene blue (MB) organic dyes in aqueous solution due to its high surface area and rich nitrogen atoms. The effect of pH, adsorption time, different initial concentration of dyes and adsorption reusability were investigated in detailed. The optimum pH is 8 for the adsorption of MB and 6 for the adsorption of MO, respectively. Under the best condition, the Langmuir model fitted the adsorption isotherm well and the adsorption behavior follow pseudo-second-order kinetics. The maximum adsorption capacity of HCP-CP for cationic dye MB (q max =751.88 mg/g) is more than twice higher than that of anionic dye MO (q max =274.73 mg/g). These capacity differences may be owing to the stronger electrostatic interaction between the negatively charged nitrogen atoms of HCP-CP with the cationic dye MB than that of MO. Moreover, the used polymer HCP-CP still retain a removal percentage above 92% after 5 times adsorption-desorption recycle. Therefore, this work provided a convenient synthetic route to develop a novel hyper-crosslinked polymer with high adsorption capacity for the entrapment of dyes from aqueous solution.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yashi Chen,Yuwei Long,Qing Li,Xinhong Chen,Xi Xu
In this work, a biobased adsorbent (CMC-PAMA) consisting of sodium carboxymethyl cellulose, polyacrylic acid and polyacrylamide was prepared by a simple thermal crosslinking method for the removal of methylene blue (MB) and Pb (II) from aqueous solutions. The CMC-PAMA showed excellent static adsorption capacities for MB and Pb (II) of 1611.44 mg·g −1 840.11 mg·g −1 , respectively, indicating its excellent performance on dyes dynamic removal. The adsorption performance of the as-prepared CMC-PAMA could be fitted well with pseudo-second-order and Langmuir isothermal model. The adsorption mechanism between CMC-PAMA and Pb (II) was confirmed by FT-IR, XPS and ion-exchange behavior. Interestingly, CMC-PAMA showed high efficiency for separation of MB/methyl orange (MO) mixtures, low equilibrium swelling ratio (0.52 g·g −1 ) in distilled water, good stability and reusability. With those combined advantages, CMC-PAMA could find potential application in wastewater treatment.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8269-8275
·
IF 1.354
Wang Manchao,Peng Lin,Wang Jiahui,Li Changqing,Guan Lihao,Lin Yuqing
In this study, hierarchical ternary nanocomposites, i.e., Cu–TiO2-mesoporous silica microspheres (Cu–TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model
dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed
to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB. The photocatalytic
degradation efficiency to MB was found to be 98% in 5 min, and almost 100% in 20 min. This study paves a way for the development of a ternary-doped catalyst for visible light photocatalytic degradation and may exhibit widely application in industry.
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CHEMOSPHERE
·
2019
·
IF 5.108
Misganaw Alemu Zeleke,Dong-Hau Kuo
Methylene blue dye is among the toxic, mutagenic, and carcinogenic pollutants. Hence, its treatment via photocatalytic degradation is an important remediation method for the sake of a healthy environment. Herein, the V 2 O 5 -CeO 2 nanocomposite catalysts were synthesized via a simple precipitation-thermal decomposition approach and used for the photodegradation of methylene blue in the presence of H 2 O 2 as an effective electron scavenger under visible light illumination. The nanocomposite catalysts were systematically characterized to investigate the effects of V 2 O 5 with the aids of X-ray, morphology, light absorption , catalytic activity , and charge transfer properties of the nanocomposite catalysts. The VC-2 nanocomposite prepared with NH 4 VO 3 :CeO 2 molar ratios at 0.15:1 was found to be the best efficient catalyst where ≥98% of methylene blue was degraded within 25 min irradiation time. From the kinetics analysis, its rate constant was found to be higher than those of the pure V 2 O 5 and CeO 2 catalysts by a factor of 12.0 and 13.5, respectively. The plausibly mechanistic elucidation of charge transfer and utilization of reactive species are conspicuous allegations of the combined effects of the nanocomposite catalyst, H 2 O 2 sacrificial agent, and visible light for the photodegradation of the dye.
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