查找使用阿拉丁产品的科研文献

Adsorptive removal of methylene blue by rhamnolipid-functionalized graphene oxide from wastewater

Zhibin Wu,Hua Zhong,Xingzhong Yuan,Hou Wang,Lele Wang,Xiaohong Chen,Guangming Zeng,Yan Wu

In this article, a rhamnolipid-functionalized graphene oxide (RL-GO) hybrid was prepared by one-step ultrasonication and adsorptive removal of methylene blue (MB) from both artificial and real wastewater by the RL-GO was investigated. The Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) area and Zeta potential analysis were used to characterize the adsorbent. The results showed that RL-GO had abundant functional groups and a mesopores feature. MB adsorption by the RL-GO increased with increase in adsorbent dose, pH, temperature and initial MB concentration, while it was insensitive to ionic strength variation. The adsorption kinetics fitted well to the pseudo-second-order model with correlation coefficients greater than 0.999. The Intra-particle diffusion and Boyd's film-diffusion models showed that the rate-controlled step was dominated by film-diffusion in the beginning and then followed by intra-particle diffusion. The adsorption isotherm was fitted by adsorption models with the suitability in order of BET > Freundlich > Langmuir > Temkin, based on comparison between correlation coefficients. Thermodynamic analysis of equilibriums suggested that the adsorption MB on RL-GO was spontaneous and endothermic. The adsorption mechanism was also proposed to be electrostatic attraction, π–π interaction and hydrogen bond . In addition, the real wastewater experiment, the regeneration study and the comparative cost analysis showed that the RL-GO composites could be a cost-effective and promising sorbent for MB wastewater treatment owing to its high efficiency and excellent reusability.

Removal of methylene blue from aqueous solutions using Poly(AA-co-DVB)

Jia Du,Luanluan Zhang,Hejun Gao,Yunwen Liao

Enhanced removal capability of kaolin toward methylene blue by mussel-inspired functionalization

Huang Qiang,Liu Meiying,Chen Junyu,Wang Ke,Xu Dazhuang,Deng Fengjie,Huang Hongye,Zhang Xiaoyong,Wei Yen

Adsorption is an effective and commonly adopted method for removal of organic pollutants from environment. In this work, we described the synthesis and the adsorption behavior of poly(sodium p-styrenesulfonate hydrate) (PSPSH)-modified kaolin, which was obtained by combination of mussel-inspired chemistry and Michael addition reaction. The amino-terminated PSPSH was synthesized by free radical polymerization using cysteamine hydrochloride as the chain transfer agent and sodium p-styrenesulfonate hydrate as the monomer. Raw kaolin and PSPSH-modified kaolin were characterized using several techniques including transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy in detail. The adsorption of methylene blue onto modified kaolin from aqueous solution was investigated, in which the effects of contact time, temperature, solution pH, and initial methylene blue concentration were studied. The experiment data were analyzed using two common adsorption models: Langmuir and Freundlich isotherm models. The kinetic adsorption data were analyzed using pseudo-first-order, pseudo-second-order, and intraparticle diffusion model. The values of thermodynamics constants such as entropy change (Δ S 0 ), enthalpy change (Δ H 0 ) and Gibbs free energy (Δ G 0 ) were also determined. The modified kaolin showed favorable dispersibility and convenient separation, high efficiency, and good regeneration capability in the removal of methylene blue from solution.

Combustion synthesis of Zn1−xCdxS and its photodegradation performance of methylene blue

Jianxiu Liu,Dafeng Zhang,Xipeng Pu,Jiaxing Liu,Renqian Zhang

Zn 1− x Cd x S ( x =0–1.0) powders were synthesized by a simple combustion method using cadmium nitrate, zinc nitrate and thiourea as raw materials. The structures, morphologies, absorbance, luminescence and photocatalytic properties of the samples were studied by X-ray powder diffraction, transmission electron microscopy , ultraviolet–visible spectrophotometry and photoluminescence . The results show that all Zn 1− x Cd x S samples exhibit hexagonal structure and no metastable cubic phase is obtained. With increasing content of Cd, red-shifts are observed in both the absorption edges of UV–vis absorption spectra and emission bands of photoluminescence spectra. Among all Zn 1− x Cd x S samples, CdS shows the best visible-light photocatalytic performance due to its narrow bandgap.

A novel flower-like MnO2 nanowires for rapid removal of methylene blue

Dongyang Zhou,Bin Gu,Jingjing Wang,Lili Ren,Guoguang Chen,Xiaolong Yang,Zhang Tao

In order to enhance the adsorption property of adsorbent, surface modification of existing adsorption materials has always been an interesting and challenging topic. Herein, the flower-like MnO2 nanowires (MNs) with three dimensions surface area and great adsorption property was successfully prepared by two-step hydrothermal route via MnO2 nanosheets in-situ growth on MnO2 nanowires. As an adsorbent, the MNs was evaluated for the removal of methylene blue (MB) from the aqueous solution. The effect of pH value, contact time, adsorbent dose, adsorption equilibrium, kinetics adsorption process, and isothermal models was investigated. The results showed that the maximum adsorption capacity of MNs of 2 g/L attained 34.247 mg/g at 5 minutes, and kinetics of MB were found fitting using the Langmuir model and the pseudo-first-order model, respectively. Furthermore, the adsorption capacity can be kept over 90% after five adsorption cycles. Therefore, the composite material can be a promising tool for developing a large variety of efficient and stable adsorbents by combining with different nanostructures for dyeing wastewater treatment.

Sweet-Potato-Vine-Based High-Performance Porous Carbon for Methylene Blue Adsorption

Wenlin Zhang,Yuhong Zhao,Qinhong Liao,Zhexin Li,Dengwei Jue,Jianmin Tang

In this study, sweet-potato-vine-based porous carbon (SPVPC) was prepared using zinc chloride as an activating and pore-forming agent. The optimised SPVPC exhibited abundant porous structures with a high specific surface area of 1397.8 m2g−1. Moreover, SPVPC exhibited excellent adsorption characteristics for removing methylene blue (MB) from aqueous solutions. The maximum adsorption capacity for MB reached 653.6 mg g−1, and the reusability was satisfactory. The adsorption kinetics and isotherm were in good agreement with the pseudo-second-order kinetics and Langmuir models, respectively. The adsorption mechanism was summarised as the synergistic effects of the hierarchically porous structures in SPVPC and various interactions between SPVPC and MB. Considering its low cost and excellent adsorption performance, the prepared porous carbon is a promising adsorbent candidate for dye wastewater treatment.Keywords:porous carbon;sweet potato vine;adsorption;methylene blue

Dielectric Barrier Discharge Plasma Coupled with Cobalt Oxyhydroxide for Methylene Blue Degradation

Xiaomei Yao,Yingbo Fang,Xiaochen Cui,Xian Cheng,Zixia Cheng

In this study, the coupled use of a double dielectric barrier discharge (DDBD) and CoOOH catalyst was investigated for the degradation of methylene blue (MB). The results indicated that the addition of CoOOH significantly promoted MB degradation performance compared to the DDBD system alone. In addition, both the removal rate and energy efficiency increased with an increase in CoOOH dosage and discharge voltage. After 30 min of discharge treatment in the coupled system (with CoOOH of 150 mg), the removal rate reached 97.10% when the discharge voltage was 12 kV, which was 1.92 times that in the single DDBD system. And when the discharge time was 10 min, the energy efficiency could reach 0.10 g (k·Wh)−1, which was 3.19 times better than the one in the single DDBD system. Furthermore, the addition of CoOOH could also significantly enhance the TOC and COD removal rates of MB. In the DDBD-coupled-with-CoOOH system, TOC and COD were 1.97 times and 1.99 times those of the single DDBD system after 20 min of discharge treatment with a discharge voltage of 12 kV and 100 mg of CoOOH. The main active substances detected in the coupled system indicated the conversion of the active species H2O2and O3into a more oxidizing ·OH was enhanced through the addition of a CoOOH catalyst, resulting in the more effective decomposition of MB and intermediate molecules.Keywords:double dielectric barrier discharge (DDBD);MB degradation;CoOOH;degradation performance

Performance and Mechanism of Fe80P13C7 Metal Glass in Catalytic Degradation of Methylene Blue

Li Ma,Kun Zhang,Feilong Guo,Tiejun Kuang

This study systematically investigates the catalytic degradation performance and reaction mechanism of Fe80P13C7Metal Glass (MG) in a Fenton-like system for the removal of Methylene Blue (MB). Kinetic experiments on degradation reveal that under acidic conditions (pH = 3), Fe80P13C7MG exhibits exceptional catalytic activity, achieving complete degradation of a 50 mg/L MB solution within 12 min. Its degradation rate significantly surpasses that of Fe78Si9B13MG and commercially available ZVI powder. Key parameters such as catalyst dosage, H2O2concentration, solution pH, and initial dye concentration were systematically examined to determine the optimal reaction conditions. The characterization results indicate that Fe80P13C7MG maintains high activity even after multiple cycles of use, attributed to surface selective corrosion and crack formation during the reaction process. This “self-renewal” mechanism continuously exposes fresh active sites. Mechanistic studies confirm that the degradation process is driven by an efficient redox cycle between Fe2+/Fe3+within the material, ensuring sustained and stable generation of •OH, which ultimately leads to the complete mineralization of MB molecules. This research provides solid experimental and theoretical foundations for the application of Fe80P13C7MG in dye wastewater treatment.

Removal of methylene blue from aqueous solution using humic-acid coated magnetic nanoparticles

Rong Ping Chen,Yin Long Zhang,Xiao Yan Wang,Cheng Yue Zhu,Ai Jun Ma,Wei Min Jiang

In this paper, magnetic Fe3O4/HA nanoparticles (MHA) were synthesized using a coprecipitation method. The structure and properties of the MHA were characterized by Fourier transform infrared spectroscopy, TG, transmission electron microscope, zeta potential, X-ray diffraction, and vibration sample magnetometer. MHA is proven to be stable in water and can be easily separated from solution under an external magnetic field. Adsorptive removal of methylene blue (MB) from aqueous solution using MHA was systematically studied. The fundamental adsorption experiments reveals that MHA is more efficient in dye removal when initial solution pH is higher than 4.0. The theoretical maximal adsorption capacity, which is based on the simulation results from the isothermal equilibrium study, is 200 mg/g. The adsorption kinetic and equilibrium behaviors of MHA are in agreement with pseudo-second-order model and Langmuir model, respectively. The value of activation energy (Ea) indicates that the adsorption of MB onto MHA is a physical process. The Gibbs free energy of the adsorption process (△G) is negative, indicating that the adsorption of MB onto MHA is thermodynamically favorable. Furthermore, MHA could be easily regenerated and reused with almost no loss of adsorption capacity, which is satisfactory for practical applications.

Adsorption behavior of methylene blue on Fe3O4-embedded hybrid magnetic metal–organic framework

Yan Xu,Jingjie Jin,Xianliang Li,Chaosheng Song,Hao Meng,Xia Zhang

A magnetic hybrid material (Fe3O4-embedded-MOF) consisting of a stable metal–organic framework HKUST-1 embedded with poly(N-vinyl-2-pyrrolidone) coated Fe3O4 microspheres was simply prepared under refluxing conditions for 4 h. The as-synthesized material was characterized using powder X-ray diffraction, scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), energy dispersive spectroscopy (EDS) and N2 adsorption–desorption at 77 K. The hybrid material was studied for the adsorption of methylene blue from aqueous solution. The effects of dye concentration, adsorbent dose, and initial pH on the adsorption of methylene blue were measured, and from these experimental data, adsorption isotherms, kinetics, and thermodynamics were obtained. The results showed that a pseudo-second-order kinetic model and Langmuir isotherm (with R2 = 0.937) matched well for the adsorption of methylene blue onto Fe3O4-embedded-MOF. Thermodynamic parameters including free energy, enthalpy, and entropy of methylene blue adsorption were calculated, and the results showed that the adsorption of methylene blue were favorable on Fe3O4-embedded-MOF. The magnetic hybrid Fe3O4-embedded-MOF material features both magnetic separation characteristics as well as excellent adsorption performance for methylene blue in aqueous solution. The results of the present study demonstrate that Fe3O4-embedded-MOF is a promising adsorbent for the removal of dye from wastewater.

Simple Fabrication of PEG Modified W18O49 for Enhanced Adsorption Performance towards Methylene Blue

Hai Yang Fu,Li Xuejiao Li,Sun Wei Sun,Liu Dongyue Liu,Gao Xiaofei Gao,Li Min Dong,Haiyang Fu

The W18O49 nanoparticles were synthesized by solvothermal method with tungsten chloride as raw material and n-propanol as solvent. Polyethylene glycol 400 (PEG-400) was modified for W18O49 nanoparticles (W18O49@PEG). The structure and morphology of W18O49 and W18O49@PEG were characterized by XRD and SEM. Methylene blue aqueous solution was used as wastewater adsorption model. And the comparative experiments with other absorbent materials, such as artificial zeolite and activated carbon were also conducted. The results revealed that after modifying by PEG-400, W18O49 has a better adsorption performance than other materials due to its large specific surface area and high surface energy. Finally adsorption circulation experiment was performed，the results indicate that the W18O49@PEG nanoparticles show great potential in the treatment of colored wastewater.

Preparation of Ni-Based Magnetic Nanocarbon and its Adsorption Performance on Methylene Blue

Xiaoying Lin,Lifang Xu,Songye Lin,Hao Lin,Tao Guo,Yuqi Li,Yamin Liu

The synthesis of magnetic porous carbon nanocomposites derived from a nickel-based metal-organic framework (Ni-MOF) via a simple solvothermal approach is reported herein. The potential of these materials for the adsorption of methyl blue (MB) dye was investigated. The physicochemical properties of the Ni-MOF-C materials were comprehensively characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectrometry (EDS), N 2 adsorption/desorption isotherms, and vibrating sample magnetometry (VSM). At a carbonization temperature of 550 ∘ C, Ni-MOF-C exhibited a maximum specific surface area of 162.17 m 2 /g and saturation magnetization of 32.27 emu/g. The material was employed for the physical adsorption of Coomassie methylene blue dye, with adsorption influenced by pH, initial dye concentration, contact time, and temperature. Under optimized conditions, including a feed pH of 10, an initial dye concentration of 1000 mg/L, a contact time of 60 min, and a temperature of 55 ∘ C, Ni-MOF-C-550 ∘ C demonstrated its highest MB dye adsorption capacity. Furthermore, the observed adsorption behavior was effectively described by both the Freundlich isothermal adsorption model and the quasi-second-order kinetic model.