CHEMOSPHERE
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2019
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IF 5.108
Fuyou Du,Lingshun Sun,Zhujun Huang,Zhengyi Chen,Zhigang Xu,Guihua Ruan,Chenxi Zhao
Electrospun reduced graphene oxide/TiO 2 /poly(acrylonitrile- co -maleic acid) composite nanofibers (E-spun RGO/TiO 2 /PANCMA NFs) were fabricated using electrospinning of the dispersive solution of PANCMA, GO and TiO 2 followed by post-chemical reduction. The obtained composite nanofibers were compressed in a dialyzer and then used to absorb and degrade malachite green (MG) and leucomalachite green (LMG) from aqueous solution. Compared to the E-spun TiO 2 /PANCMA and GO/TiO 2 /PANCMA NFs, the E-spun RGO/TiO 2 /PANCMA NFs exhibited higher adsorption capacity and photocatalytic degradation ability. Under optimized conditions, 90.6% of MG and 93.7% of LMG from 50 mL aqueous sample solution were adsorbed on the RGO/TiO 2 /PANMA NFs (3.0 mg fibers) in 2.0 min, and subsequent the 91.4% and 95.2% of MG and LMG adsorbed on the NFs were degradated in 60 min under UV irradiation, respectively. In addition, the E-spun RGO/TiO 2 /PANMA NFs exhibited good reusability and could be reused in multiple cycles of operations for adsorption and photocatalytic degradation of MG and LMG. This work demonstrated that the electrospun composite nanofibers are promising materials for removal of pollutants from environmental water samples.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Materials
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2017
·Vol. 10
·期 1
·84
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IF 2.654
Chaodao Li,Jianjiang Lu,Shanman Li,Yanbin Tong,Bangce Ye
Based on the adsorption performance of composite microspheres with activated carbon (AC) and sodium alginate (SA), as well as the magnetic property of Fe3O4, we designed and explored an efficient strategy to prepare a unique, multifunctional Fe3O4/AC/SA composite absorbent (MSA-AC) that extracted dye from aqueous solution. The composite exhibited the following advantages: rapid and simple to prepare, environmentally friendly process, low-cost, recyclability, and multi-functionality. The physicochemical properties of the prepared magnetic microspheres were measured, and methylene blue (MB) was selected to investigate the performance of the magnetic absorbent. The results showed a maximum adsorption capacity of 222.3 mg/g for MB. Adsorption studies revealed that the data of adsorption isotherms and kinetics fit the pseudo-second-order kinetic model and Langmuir isotherm model.Keywords:magnetic microsphere;methylene blue;adsorption properties
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
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2023
·Vol. 28
·期 2
·819
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IF 4.6
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
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 1
·65
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IF 4.034
Jiquan Li,Youyan Wang,Huan Ling,Ye Qiu,Jia Lou,Xu Hou,Sankar Parsad Bag,Jie Wang,Huaping Wu,Guozhong Chai
Bismuth ferrite (BiFeO3, BFO) submicron cubes and 3D BFO/graphene composite materials were synthesized by a simple hydrothermal process. The crystallization processes of the 3D BFO/graphene composites with different graphene oxide (GO) concentrations were studied for their visible light photocatalytic properties. Compared to the single BFO submicron cubes, 3D BFO/graphene composites have greatly improved photocatalytic activity. A high photocatalytic performance is obtained at a GO concentration of 3 mg/mL, with the degradation rate of methylene blue (MB) dye reaching up to 92% in 140 min. The enhancement of photocatalytic activity can be attributed to the large specific surface area and 3D architecture of 3D composites, which provide more transport paths to effectively improve the separation rate of photo-generated electrons and holes. Therefore, 3D BFO/graphene composites have a broad prospect of application in the field of photocatalysis.Keywords:BiFeO3;hydrothermal;photocatalysis;methylene blue
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Catalysts
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2023
·Vol. 13
·期 11
·1407
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IF 3.9
Wei Chen,Mei Zeng,Junjiao Yang
In the heterogeneous Fenton reaction, a solid catalyst reacts with H2O2to generate highly oxidizing free radicals, that degrade organic pollutants in aqueous solutions. In this study, impregnation calcination was used to modify activated carbon and load it with various metal compounds. The synergistic catalysis of the various metal compounds showed improved catalytic activity, and the prepared heterogeneous Fenton catalyst exhibited high catalytic activity, a wide pH range, and good stability. The concentration ratios of the Fenton catalyst impregnation solutions-were as follows: Fe3+, Cu2+, Mn2+, and Ce3+at 0.45, 0.72, 0.19, and 0.11 mol/L, respectively. The optimal sintering temperature of AC impregnation was determined through TGA/DSC, SEM, SEM-EDS, XPS, and XRD testing. At a final calcination temperature of 900 °C, the degradation efficiency of 10 ppm methylene blue reached 98.25% at pH 5 with 5 mM H2O2. After ten soaking cycles, the degradation efficiency exceeded 90%. The structure and performance of the catalysts were characterized using EPR, BET, ICP, and UV spectroscopy, demonstrating the excellent performance of the catalyst and providing an improved treatment plan for solving wastewater problems.Keywords:Fenton;catalyst;water treatment;methylene blue
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Polymers
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2021
·Vol. 13
·期 4
·558
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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.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Yi He,De Bin Jiang,Jie Chen,De Yi Jiang,Yu Xin Zhang
In this research, MnO 2 nanosheets on montmorillonite (MnO 2 nanosheets@MMt) was synthesized by one-pot hydrothermal method and characterized by X-ray diffraction, Fourier transform infrared spectra , nitrogen adsorption and scanning electron microscopy. It was found that honeycomb-like MnO 2 nanosheets vertically grew on the surface of montmorillonite. MnO 2 nanosheets@MMt exhibited high methylene blue (MB) removal rate, which reached 97.7% within 5 min under the condition of pH 2, MnO 2 nanosheets dosage of 0.1 g L −1 and initial dye concentration of 10 mg L −1 . Additionally, the influencing factors such as pH value, amount of MnO 2 nanosheets@MMt, and MB concentration were also investigated in this paper. Results showed the MB degradation process was correlated with pH value, and the MnO 2 nanosheets@MMt achieved MB removal rate of 92.8% within 5 min under pH 11 because of its absorption capacity of MB. The kinetics of the adsorption process complied with the Pseudo-second-order model. The Langmuir model was found to be the most suitable for describing the experimental equilibrium data of MnO 2 nanosheets@MMt. The MnO 2 nanosheets@MMt showed high adsorption capacity of 363.63 mg g −1 for MB dye. The oxidative decomposition of MB was conducted in the presence of MnO 2 nanosheets@MMt in the low pH, finding that the lower the pH was, the faster the degradation rate was. This research demonstrates that MnO 2 nanosheets@MMt has potential applications in wastewater treatment .
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2014
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IF 2.086
Yang Wang,Yali Cao,Yizhao Li,Dianzeng Jia,Jing Xie
TiO 2 nanorods with different crystal form and size have been successfully synthesized by two different solid-state chemical reaction routes. The composition and microstructure of as-synthesized materials were characterized by XRD , TGA , Raman, TEM , FESEM , BET, and DFT analysis. It was found that the growth of TiO 2 rod-like structure was directly assembled by anatase titanium nanoparticles about 20 nm in size. The photocatalytic activities of samples were investigated by measuring the degradation of methyl orange (MO) and methylene blue (MB) under UV or simulated sunlight irradiation. About 99% of MB was degraded by as-synthesized TiO 2 within 50 min, which revealed that samples had excellent photocatalytic activities. This study provides a simple and economical way to prepare high active anatase titanium photocatalysts .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Omega
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2022
·
IF 4.132
Yaohui Sun,Yanhui Li,Bing Chen,Mingzhen Wang,Yang Zhang,Kewei Chen,Qiuju Du,Yuqi Wang,Xinxin Pi
It can be difficult to remove dark methylene blue (MB) from water effectively. The use of sodium alginate and bentonite (Ben) as the matrix produced a displacement reaction that occurred in cobalt chloride, which allowed Ben to be successfully encapsulated in cobalt alginate (CA). Finally, a vacuum freeze-drying method was used to prepare a low-cost composite of CA/Ben aerogel for adsorbing MB in aqueous solutions. In addition to scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy, the composites were also characterized and analyzed. Different adsorption experiments were conducted in order to determine the effects of dosage, pH, adsorption time, and temperature on the adsorption performance of the adsorbent. According to the results of the experiment, the adsorption capacity of CA/Ben aerogel was 258.92 mg·g–1, and the pseudo-first-order kinetic model and Freundlich isotherm model can fully explain the adsorption process of MB on this aerogel. The composite material reported in this paper is easily recycled, and the removal rate reaches 65% after four times of recycling. Moreover, compared with other adsorbents, the composite material of the invention is highly environmentally friendly and has a simple preparation process. A large-scale application of this technology is the removal of dyes from water on a large scale.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2022
·
IF 6.137
Summaira Saghir,Chengkai Pu,Enfa Fu,Yongqiang Wang,Zhenggang Xiao
High surface area, micro, and mesoporous functionalized biochar were prepared from pistachio shells and utilized for the adsorption of congo red (CR) and methylene blue (MB) from polluted water. The results indicate that increased pyrolysis temperature improved the porosity, specific surface area (S BET ), and pore size. The biochar obtained at 900 °C, named as PSB-900, possess an S BET of 467.8 m 2 /g with a pore diameter of 5.6 nm, which is higher than the S BET and pore size of the biochar obtained at 600 and 300 °C. The batch adsorption of CR and MB with PSB-900 was performed with different dye concentrations, adsorbent dosage, pH, and temperature to determine their impact on adsorption capacity. The experimental results were further validated with kinetics and isotherm statistics. The PSB-900 achieved the maximum adsorption capacity for CR, 614.7 and 384.2 mg/g for MB. By contrast, biochar obtained at 300 and 600 °C exhibited comparatively low adsorption capacity owing to the difficult pore-filling and low S BET . The characterization results indicate that pore filling, π-π interaction, hydrogen bonding , electrostatic interaction, and surface complexation were the fundamental features of the adsorption mechanisms of organic dyes on PSB-900. Furthermore, a reusability assessment was also conducted, and the results demonstrate that PSB-900 can be recycled after the adsorption process and exhibits good recyclability for multiple cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2023
·Vol. 15
·期 15
·11867
·
IF 3.9
Na Chai,Lihui Gao,Shulei Li,Zilong Ma,Lingni Li,Ming Hu
Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material compositions of the hydrochars were determined with SEM, zeta potential, and XRD, and the adsorption mechanism of MB on two modified hydrochars was analyzed with FTIR, XPS, and DFT calculation. The results showed that modified hydrochars with a rough surface structure and rich oxygen-containing groups exhibited a strong affinity for MB, and the adsorption capacity of PMHC-NaHCO3and PMHC-KOH for MB reached 121.28 mg/g and 278.41 mg/g, respectively, with PMHC-KOH achieving more rapid adsorption of MB, at a rate of 0.043 g/mg/min. After five adsorption/desorption cycles, the two modified hydrochars still maintained a high adsorption rate of MB (92.32%/98.43%). The excellent adsorption performance of the modified hydrochars was attributed to hydrogen bonding, π-π interaction, electrostatic attraction, and ion exchange. DFT calculations revealed that oxygen-containing groups of the modified hydrochars played an important role in the adsorption of MB and confirmed that electrostatic attraction, hydrogen bonding, and π-π interactions were the key forces for rapid and efficient adsorption of MB. The prepared adsorbents gave full play to the regenerative applicability of agricultural waste, the simple alkali impregnation method eliminated the need for the additional cost of pyrolysis and activation, and their application in MB adsorption realized the treatment of waste with waste.Keywords:alkali-modified hydrochar;methylene blue;oxygen-containing functional groups;adsorption
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
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IF 1
Chaoliang Wang,Xiaoyang Zhao,Yongjun Li,Dehu Yang,Fuyang Liu,Feng Liu,Li Li,Ping Ke
A series of simple and low-cost Ca-doped g-C 3 N 4 (Ca/CN-X) photocatalysts were fabricated through a two-step calcination method for photodegradation of methylene blue (MB) simulated dyeing wastewater. The results showed that the photodegradation efficiency of Ca/CN-15 % on MB removal under visible light was 97.7 %, and the degradation rate constant was 4 times that of CN, showing the best photocatalytic performance. This was attributed to the fact that the doping of Ca expanded the absorption band edge, reduced the band gap, and suppressed the photogenerated electron-hole recombination, thereby increasing its corresponding photocatalytic activity. A possible photodegradation mechanism was explored, and it was found that h + was the main active species during the process. The above indicated that Ca/CN-X can be regarded as a promising catalyst for dyeing wastewater treatment.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）