Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 6
·1795-1801
·
IF 0
Ling Li,Xiao Lan Liu,Ming Gao,Wei Hong,Gui Zhen Liu,Lu Fan,Bin Hu,Qing Hua Xia,Li Liu,Gong Wu Song,Zu Shun Xu
The adsorption processes of methylene blue from aqueous solution on Fe3O4/HKUST-1 and Fe3O4/HKUST-1/GO composites were compared. The addition of GO has greatly decreased the surface area and pore volume, led to smaller pore size, and enhanced the adsorption capacity of Fe3O4/HKUST-1/GO. The different interesting phenomena and the effect of GO were analyzed. The high adsorption capacity, excellent reusability and stability make Fe3O4/HKUST-1/GO attractive for the removal of MB from aqueous solution.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 12
·7993-8003
·
IF 1.093
Liu Shan-Shan,Ge He-Yi,Cheng Shi-Lin,Zou Yu,Zhang Kai-Li,Chu Cai-Xia,Gu Nian-Liang
In this work, a novel magnetic biomass adsorbent was synthesized by a simple method. The adsorbent prepared from chitosan, graphene oxide and CoFe2O4 with a ‘skin-like’ morphology had a strong adsorption capacity for methylene blue adsorption and was
easily separated from the liquid. The synthesized samples were characterized by scanning electron microscope, energy dispersive spectroscopy, fourier transform infrared spectroscopy and X-ray diffractomer. The adsorption capacity of the adsorbent was evaluated. The various factors affecting
the adsorption performance were explored. Meanwhile, the adsorption process was simulated by five kinetic models and four isotherm models. The adsorption process was well described by the Pseudo-second-order kinetic model and the Freundlich isotherm model. ΔG < 0, ΔH
< 0 and ΔS < 0 indicate that the adsorption process was a spontaneous, exothermic and randomness decrease process. The adsorbents loaded with methylene blue could be desorbed by soaking in dilute hydrochloric acid. The adsorption–desorption cycle experimental results
showed that the adsorbent had good reusability performance.
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高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 8
·085505
·
IF 1.7
Tian ZHOU,Douhao YANG,Yijun WANG,Jiushan CHENG,Qiang CHEN,Bowen LIU,Zhongwei LIU
Defect engineering of metal-organic frameworks has attracted increasing attention in recent years for potential applications in gas storage and catalysis. In this study, defective UiO-66 is obtained by Ar and H2 plasma treatments. Compared with the pristine UiO-66, a new aperture with a size of ∼4 nm appears for a sample with the plasma modification, indicating the formation of mesopores within UiO-66 framework. Characterization results demonstrate that the pore volume, surface area and the number of Lewis and Brönsted acid sites can be easily tuned by varying the discharge parameters. The adsorption performance of UiO-66 is evaluated for the adsorption of methyl blue. In comparison to the pristine UiO-66 and the sample with H2 plasma treatment, the Ar plasma modified sample shows excellent adsorption activity due to the suitable pore size and volume. Equilibrium adsorption capacity as high as 40.6 mg·g−1 is achieved for the UiO-66 (Ar) sample.
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Green Chemistry Letters and Reviews
·
2022
·
IF 6.016
Dongcan Lv,Guangce Jiang,Chengpeng Li,Qianchen Zhu,Zhimin Wang
Modified biomass is a green and renewable sorbent to remove organic pollutants in water. In this study, an efficient bio-based adsorbent was obtained by Fenton-like pretreatment of peanut hull with FeOCl, which can be used to efficiently remove methylene blue from water. The adsorption experiment showed that under the conditions of 25°C, pH 6.0, MB concentration of 100 mg·L−1 and adsorbent dosage of 1.0 g·L−1, the adsorption equilibrium could be achieved within 6 min, with MB removal rate of 85.1% and maximum adsorption capacity of 132 mg·g−1, which was much higher than that of untreated peanut hull (64 mg·g−1). Material characterization showed that Fenton-like pretreatment resulted in the surface morphology change and pore structure formation of peanut hull, and the specific surface area increased significantly, which was an important reason for rapid adsorption. The adsorption mechanism showed that the adsorption of methylene blue followed pseudo second-order models, and conformed to Redlich-Peterson and Langmuir models. According to the thermodynamic analysis results, it is concluded that the adsorption process is endothermic and spontaneous. Adsorption mechanism includes hydrogen bonding, static electricity and van der Waals force.
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Desalination and Water Treatment
·
2016
·
IF 1.272
Kang-Kang Yan,Jiao Huang,Xue-Gang Chen,Shu-Ting Liu,Ao-Bo Zhang,Ying Ye,Mei Li,Xiaosheng Ji
Rice husk ash (RHA) is a promising low-cost adsorbent. Meanwhile, the magnetic and catalytic capabilities of ferrite nanoparticles make it efficient for water purification. In this study, we prepared RHA and rice husk/CoFe2O4 composite (RHC) and studied their methylene blue (MB) adsorption capacities in fixed-bed columns. The column regeneration was also investigated. Both RHA and RHC are amorphous materials with Brunauer, Emmet and Teller (BET) surface area of >180 m2 g−1 and mesopore volume of >0.1 cm3 g−1. The CoFe2O4 nanoparticles are mainly located on the inner surface of RHC, which significantly increased the mesopore volume and average pore size but decreased the BET surface area and micropore volume. The adsorption ability of RHC was investigated in a fixed-bed column, with RHA as control. The effects of column parameters including bed height, flow rate, and inlet MB concentration on breakthrough curves were studied. The mathematical models, such as bed-depth service time (BDST), Thomas, and Yoon–Nelson models were applied to predict the breakthrough curves. It was found that BDST model fitted the breakthrough curves best. Results showed that the breakthrough time of RHC is more than two times than that of RHA, which may be attributed to the catalytic performance of CoFe2O4 nanoparticles. The exhausted RHA and RHC were retreated by three methods and eluted of the column with ethanol caused the highest regeneration efficiency. In addition, fixed-bed tests of RHA and RHC on real dye wastewater demonstrated that these adsorbents have good practical value and application prospect.
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Carbohydrate Polymer Technologies and Applications
·
2022
·
IF 0
Xiwang Cao,Min Liu,Wentao Bi,Jun Lin,David Da Yong Chen
The surface of cellulose particles was carboxylated (2.44 mmol/g) in a deep eutectic solvent containing carboxylic acid. Based on the carboxyl content, the effects of key factors on cellulose carboxylation was systematically investigated. In addition, the reaction mechanism was studied by using liquid chromatography-mass spectrometry, and the influence of deep eutectic solvent containing carboxylic acid on the structure and physicochemical properties of cellulose during carboxylation was examined using different characterization techniques. The results showed that the type of carboxylic acid, cellulose particle size, and pretreatment methods significantly affect the carboxylation efficiency, degradation, and carbonization of cellulose. The internal crystal structure of cellulose did not change after the carboxylation reaction, while the surface crystal structure was destroyed by carboxylation, which greatly improved the dispersion and hydrophilicity properties of the product. The kinetics and thermodynamics of carboxyl cellulose adsorption were studied as well. Potential application of carboxyl cellulose in the adsorption of pollutants was demonstrated. This study provides a new method for the direct modification of cellulose in deep eutectic solvents, as well as a new sustainable strategy for modifying other materials.
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Sustainability
·
2022
·Vol. 14
·期 22
·15290
·
IF 3.889
Jiaqi Bu,Lu Yuan,Hongru Jiang,Chongqing Wang
A novel adsorbent (GO-TOA) was prepared by condensation and self-assembly of graphene oxide (GO) and thiourea, and it was characterized systematically. The results revealed that thiourea has anchored on graphene oxide (GO) successfully. The results showed that GO-TOA had a higher adsorption capacity (641.724 mg/g) and adsorption rate (92.32%) than GO (196.8 mg/g and 65.6%), indicating that the introduction of thiourea greatly improved the adsorption capacity of GO. Adsorption kinetics, adsorption thermodynamics isotherm, and adsorption thermodynamics were used to study the adsorption mechanism. The results show that GO-TOA still has an adsorption rate of 90.44% compared with 0 cycles (92.32), indicating that GO-TOA has good activation and regeneration capacity. In addition, ethanol and dilute hydrochloric acid were used for the desorption of MB, and the effect of desorption was found very well. Through reusability experiments, we also found that GO-TOA has excellent application potential. We believe that GO-TOA will be a potential adsorbent for MB.Keywords:adsorbent;methylene blue;thiourea;graphene oxide;self-assembly
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Polymers
·
2021
·Vol. 13
·期 4
·558
·
IF 4.329
Wenhui Zhu,Caiyun Zhang,Yali Chen,Qiliang Deng
Photothermal materials are attracting more and more attention. In this research, we synthesized a ferrocene-containing polymer with magnetism and photothermal properties. The resulting polymer was characterized by Fourier-transform infrared (FT-IR), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Its photo-thermocatalytic activity was investigated by choosing methylene blue (MB) as a model compound. The degradation percent of MB under an irradiated 808 nm laser reaches 99.5% within 15 min, and the degradation rate is 0.5517 min−1, which is 145 times more than that of room temperature degradation. Under irradiation with simulated sunlight, the degradation rate is 0.0092 min−1, which is approximately 2.5 times more than that of room temperature degradation. The present study may open up a feasible route to degrade organic pollutants.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 237
·期 1
·8
·
IF 3
Li Xiaoya,Zheng Ru,Duan Guangyu,Cao Zhanfang,Han Kai,Zhong Hong,Ma Xin,Wang Shuai
A poly( N -vinylpyrrolidone)-graphene oxide (NVP-GO) composite with high adsorption capacity for methylene blue (MB) was synthesized and comprehensively characterized using SEM, XRD, FT-IR, TG, elemental analysis, nitrogen physical adsorption, and XPS. The adsorption of MB onto NVP-GO was examined in relation to several variables, including contact time, adsorption temperature, initial concentration of MB, and pH. Adsorption kinetics, isotherms, and thermodynamics were thoroughly investigated. The adsorption kinetics followed the pseudo-second-order model, and the Langmuir isotherm model indicated a monolayer adsorption pattern of MB onto NVP-GO, with the maximum adsorption capacities ranging from 116.6 to 161.3 mg·g −1 at temperatures between 25 and 45 °C. Thermodynamic assessments and activation energy calculations demonstrated that the adsorption process was spontaneous, endothermic, and controlled by chemical activation. XPS analysis highlighted the significance of electrostatic interactions, n–π interactions, π–π stacking, and hydrogen bonding in mediating the adsorption mechanisms between NVP-GO and MB. Notably, NVP-GO maintained stable adsorption efficiency over three consecutive adsorption–desorption cycles, highlighting its potential as a promising adsorbent for wastewater treatment. Graphical
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Journal of Advanced Research
·
2025
·
IF 13
Mengjiao Wu,Chengpu Lv,Yuling Xiong,Wenglong Li,Yuangui Lin,Jing Li,Fei Yu,Huan Yuan,Biao You,Qiuping Zhang,Ming Xu
Introduction Heterostructured photocatalysts have shown an enormous potential in photocatalytic degradation of organic pollutants in wastewater. However, the efficacy of such heterojunction on the photocatalytic degradation behaviors has not yet been fully revealed. Objectives This work aims to demonstrate a specific photocatalytic degradation behavior of ZnO-based heterostructured nanocomposites toward methyl orange (MO) and methylene blue (MB) dyes based on a systematically comparative investigation for their physical and chemical properties. Methods A series of low-cost and efficient ZnO-based heterostructured nanocomposite photocatalysts including ZnO/CuO, ZnO/TiO 2 and ZnO/SnO 2 with 3 and 10 mol% of CuO/TiO 2 /SnO 2 were synthesized by a simple strategy to combine the modified polymer-network gel and traditional sol–gel methods. The physical and chemical properties were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), ultraviolet–visible (UV–Vis) absorption spectra, photoluminescence (PL), surface photovoltage (SPV), electrochemical impedance spectroscopy (EIS) and zeta potential. Results Owing to the fast interfacial charge transfer at the heterojunction, all the three ZnO-based nanocomposite catalysts exhibited higher efficient separation of photogenerated electrons and holes, delivering an enhanced photocatalytic activity for the degradation of organic dyes compared with pure ZnO. Three photocatalysts of ZnO/3 %-CuO, ZnO/3 %-TiO 2 and ZnO/10 %-SnO 2 (marking as ZC3, ZT3 and ZS10, respectively) were capable of achieving the complete degradation of 4 mg/L concentration of MB dye within 50 min, and the first two could degrade MO within 80 min. However, the degradation rate of MO by ZS10 became significantly slower. For MO and MB degradation, the active species of photogenerated holes ( h h ν + ) and superoxide radicals ( · O 2 - ) play the predominant roles, respectively, followed by hydroxyl radicals ( · OH ). The differences in heterojunction configuration and dominant active species result in a specific photocatalytic degradation behavior of ZnO-based composite nanostructures. Conclusion The generation of the active species are influenced by the heterojunction configurations, of which the essence is that the different band alignments can results in the differences of interfacial charge transfer behaviors, and thus selective generation of the active species such as h h ν + , · O 2 - and · OH . Importantly, this work offers a fundamental understanding for specific photocatalytic degradation of the different heterojunction nanostructures towards the different organic dyes.
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ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Ling-Li Zhao,Jia-Le Li,Ruo-Yao Cui,Jian Wang,Di Weng,De-Wen Zhang
G-triplexes are noncanonical DNA structures formed by three guanine tracts, but their sequence design rules for small-molecule binding remain unclear. In this work, we carried out a systematic sequence screening to optimize G-triplex sequences for improved interaction with methylene blue (MB), and applied the best sequence in an electrochemical biosensor for melamine detection. Over 80 candidate sequences were designed by varying loop nucleotides, 5′-flanking bases, and strand length, and were evaluated by square wave voltammetry. The optimal sequence F9 (5′-ATGGGAGGGTGGG-3′) achieved the highest current suppression (ΔI/I0 ≈ 0.81), outperforming all tested G-triplex and several well-known G-quadruplex sequences. Circular dichroism confirmed that F9 folds into a parallel G-triplex with a melting temperature of 65.1 °C, which increased to 70.0 °C upon MB binding. Electrochemical titration gave a 1:1 binding ratio with an association constant of 9.37 × 105 M–1. Molecular dynamics simulations showed that MB binds to the 5′-face of the G-triplex by π–π stacking, with a computed binding free energy of −151.9 kJ/mol. A hairpin probe (MelaPin) combining the F9 sequence with a poly-T melamine recognition region was then constructed. The resulting biosensor showed a linear response over 1–100 μM melamine with a detection limit of 0.74 μM, and a recovery of 96.0 ± 0.8% in spiked infant formula. This work provides a practical framework for G-triplex sequence design and shows that the G-triplex/MB system can serve as a simple, label-free signal module for electrochemical sensing.
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Catalysts
·
2025
·Vol. 15
·期 7
·610
·
IF 4
Wei Wang,Jiaqi Liu,Guang Shi,Shiqi Wu,Nan Zhang,Ruixia Yuan
Spherical Cu2O nanoparticles were obtained by reducing copper acetate in N,N-dimethylformamide (DMF) system using glucose as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant, with which spherical PdCu nanocatalysts were thus synthesized by disproportionation. The catalyst was used for the activation of peroxymonosulfate (PMS) and showed an excellent degradation effect on rhodamine B and methylene blue-contained printing and dyeing wastewater with good stability. Additionally, the surface morphology analysis of the catalyst was carried out by SEM and TEM. The structure was characterized by XRD and FT-IR. The valence state and composition of the catalyst were characterized by XPS. The catalytic performance of the prepared catalysts was investigated with methylene blue and rhodamine B used as target pollutants. The results showed that the catalytic reduction efficiency of PdCu nanocatalyst for the two pollutants could reach 99% at 20 °C, when catalyst concentration was 60 mg/L and PMS concentration was 1.0 g/L and 0.6 g/L, respectively. The degradation efficiency of the catalyst was significantly reduced when Cl−,HCO3−and HA were present in the water. The degradation efficiency was above 90% when the pH was in the range of 5–11. The excellent performance of the PdCu/PMS system in the treatment of RhB-contained wastewater was further confirmed by taking into account of the data of free radical quenching experiment and the results of electron paramagnetic resonance (EPR) experiment. After three cycles, the removal rate of MB and RhB could still be maintained at more than 90%, which proved its excellent recyclability due to its remarkable stability and efficiency.
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