JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 29
·16351-16361
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IF 4.22
Que Aizhen,Zhu Taoyu,Zheng Yuying
Methylene blue (MB) has been a severe threat to the ecological environment and organismal health, and synthesizing effective adsorbents for MB adsorption becomes an urgent demand for environmental protection. Magnesium silicate (MgSi) has proven to be an efficient adsorbent for MB removal. A hollow bubble-wrap-like reduced graphene oxide/magnesium silicate (HG@MS) composite with high efficiency for MB removal was synthesized by template and hydrothermal method. Microsphere polystyrene was used as the template for fabricating bubble-wrap-like graphene oxide, while magnesium silicate is in situ growth on the surface of reduced graphene oxide. After removing the PS template, the hollow bubble-wrap-like HG@MS adsorbent was made, which was assigned to a large surface area (570 cm 2 /g). Such a high surface area provides abundant adsorption sites for MB, which resulted in the maximum adsorption capacity of 595.2 mg/g. Meanwhile, the adsorption of MB on the adsorbent follows the pseudo-second-order kinetic model and the Langmuir isothermal model. The desorption results reflected that HG@MS remains 86% adsorption capacities for 5 recycles, which confirms HG@MS is recyclable.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·271
·
IF 3.504
Renyao Huang,Li He,Tao Zhang,Dianqing Li,Pinggui Tang,Yingying Zhao,Yongjun Feng
Magnesium silicate as a high-performance adsorption material has attracted increasing attention for the removal of organic dye pollution. Here, we prepared a series of magnesium silicate hydrates (MSH) in a hydrothermal route, and carefully investigated the corresponding adsorption behavior towards methylene blue (MB) as well as the effect of surface charge on adsorption capacity. The results show that surface charge plays a key role in the adsorption performance of MSH for MB, a negative surface charge density follows the increase of Si/Mg feeding ratio from 1.00 to 1.75, and furthermore the higher negative charge favors the improvement of the adsorption capacity. Among four investigated samples (MSH = 1.00, 1.25, 1.50, and 1.75), MSH-1.75 has the highest negative surface charge and shows the largest adsorption capacity for MB. For example, the equilibrium adsorption quantity is 307 mg·g−1for MSH-1.75, which is 35% higher than that of 227 mg·g−1for MSH-1.00. Besides, for MSH-1.75, the as-prepared sample with negative charge exhibits ca. 36% higher adsorption quantity compared to the sample at the zero point of charge (pHZPC). Furthermore, magnesium silicate hydrate material with Si/Mg feeding ratio = 1.75 demonstrates the promising removal efficiency of beyond 98% for methylene blue in 10 min, and the maximum adsorption capacity of 374 mg·g−1calculated from the Langmuir isotherm model.
研究领域:
环境化学
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材料科学
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纳米技术
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物理化学
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污染治理
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 7
·1-17
·
IF 2.9
Gao Wei,Li Yufeng,Zhao Jitao,Zhang Zhe,Tang Weiwei,Wang Jun,Wu Zhenyu
Methylene blue (MB), as a typical pollutant in industrial dyestuff wastewater, has caused serious water pollution. Therefore, reduced graphene oxide (rGO)/TiO 2 nanocomposites were synthetized by a simple hydrothermal technique and used as photocatalyst to degrade MB. It was illustrated when TiO 2 nanoparticles were loaded 5wt.% rGO framework, nanocomposite had a huge specific surface area of 176.45 m 2 g −1 and the average pore size of 4.25 nm. Effects of the rGO fraction in rGO/TiO 2 photocatalyst, the rGO/TiO 2 photocatalyst content, the initial pH, and the initial MB concentration on MB degradation efficiency were studied. The degradation efficiency about 98.18% was acquired at 5rGO/TiO 2 content of 0.4 g L −1 , pH = 6, MB concentration of 60 mg L −1 . The degradation efficiency of 5rGO/TiO 2 for MB was still as high as 86.24% after the tenth cycles, demonstrating rGO/TiO 2 nanocomposites were useful for the practical application. The potential photocatalytic mechanism of rGO/TiO 2 for MB degradation was immediate oxidative degradation procedure, and the combined action of \({O}_{2}^{\bullet -}\) , \({OH}^{\bullet }\) and h + can contribute to the photocatalytic degradation of MB. Furthermore, the photocatalytic degradation kinetic of rGO/TiO 2 for MB under UV irradiation was first-order model.
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高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Mingyu Liu,Jiajia Dong,Weili Wang,Mengmeng Yang,Yifan Gu,Runping Han
ABSTRACT Magnetic graphene oxide (MGO) was synthesized by co-precipitation and used as an adsorbent for the removal of methylene blue (MB) from aqueous solution in batch mode. Characterizations of the materials before and after modification were performed using several techniques such as scanning electron microscopy, Fourier transform infrared spectroscopy, vibrating-sample magnetometry, Raman spectra, X-ray photoelectron spectroscopy (XPS), etc. The effects of adsorbent dose, solution pH, common salt concentrations, MB concentration, and contacting time were systematically investigated. Results showed that the adsorption capacity at 313 K could reach up to 62.7 mg·g –1 . The optimal pH was 9 and the salinity was disadvantageous of MB adsorption. Equilibrium adsorption data were best fitted by Koble–Corrigan model, indicating that the adsorption process may be based on multi-layer heterogeneous adsorption and controlled by chemical adsorption process. The Elovich kinetic model can be used to describe the process of MB adsorption, indicating that the adsorption process may be the diffusion process of non-homogeneous phase. Thermodynamic analyses showed that the adsorption process was spontaneous, endothermic and entropic increase. In addition, the possible adsorption mechanism was also proposed based on the experimental results and XPS analysis. It is concluded that the mechanism of MB adsorption be mainly π–π bond and electrostatic force. Furthermore, MB-loaded MGO can be reused in a secondary adsorption for removal of congo red with the adsorption capacity of 319 mg·g –1 . Based on the results, it was inferred that MGO could be used as a promising adsorbent for dye removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2017
·
IF 1.751
Zhonghua Wang,Haiqian Zhao,Hanbing Qi,Xiaoyan Liu,Yang Liu
Behaviours of the free radicals during the methylene blue (MB) oxidation process in the Fe2+/H2O2 system were studied to reveal the reason for the low utilization efficiency of H2O2. The roles of O2−∙, ∙OH and HO2∙ radicals were proven to be different in the MB oxidation process. The results showed that O2−∙ radicals had a strong ability to oxidize MB; however, they were not the main active substances for MB degradation due to the low concentration in the traditional Fe2+/H2O2 system. HO2∙ radicals could not oxidize MB. ∙OH radicals were the main active substances for MB oxidation. In the short initial stage, the utilization efficiency of H2O2 was high, because the generation rate of ∙OH was much higher than that of HO2∙. More ∙OH radicals were involved in the MB oxidation reaction. In the long deceleration stage (after the short initial stage), a large amount of H2O2 was consumed, but the amount of oxidized MB was very small. Most of the ∙OH radicals were consumed via the rapid useless reaction between ∙OH and HO2∙ in this stage, resulting in the serious useless consumption of H2O2. It is a feasible method to improve the utilization efficiency of H2O2 by adding suitable additives into the Fe2+/H2O2 system to weaken the useless reaction between ∙OH and HO2∙.
研究领域:
环境化学
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高级氧化技术
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水处理技术
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Miao Jiang,Peng-Li Zhao,Yong-Ning Yue,Xue-Qin Song,Li Wang
With the acceleration of industrialization and energy consumption, global concerns for the safety of ecological system and sequent human health have attracted consideration attention increasingly in view of the severe contamination both in aqueous environment and aerosphere. Therefore, the development of multifunctional species for efficient adsorption of pollutants and chemical fixation of CO 2 receives increasing attention. Herein, an anionic Er III metal organic framework ( Er-MOF ) with large hexagonal channels, is obtained based on a benzene-spaced tetracarboxylate ligand, H 4 L (H 4 L = 1,4-bis(2′,2′′,6′,6′′-tetracarboxy-1,4′:4,4′′-pyridyl) benzene). Adsorption analysis indicates that Er-MOF behaves as an excellent adsorbent for selectively absorbing MB in water with a maximum adsorption capacity of 494.1 mg·g ‒1 . The adsorption mechanism could be a combination of size matching, electrostatic interaction, π···π stacking and hydrogen bonding. In addition, Er-MOF is demonstrated to be an efficient catalyst in the cycloaddition of CO 2 with epoxides under mild conditions due to its excellent stability, substantial specific surface area, confined space and well-exposed Lewis acid/base sites. The findings presented herein had great significance for enriching the multifunctional lanthanide MOFs in environmental applications.
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2011
·Vol. 51
·期 12
·2417-2424
·
IF 1.296
Yiming Zhou,Shiyu Fu,Hao Liu,Shaoping Yang,Huaiyu Zhan
Superadsorbent cellulose-graft-acrylic acid (C-g-AA) hydrogels were successfully prepared via free radical polymerization in phosphoric acid solution. Phosphoric acid solution provides a homogeneous reaction system. The C-g-AA hydrogels have a porous network inner structure with cellulose as the backbone. The introduced carboxyl groups enable the C-g-AA hydrogels with good swelling property (swelling ratio 7327%) and excellent MB adsorption capacity (equilibrium adsorption amount 2197 mg g −1 ). The dynamic swelling behaviors of the hydrogels were tested, water intake of hydrogels followed a non-Fickian type diffusion. The effects of mole ratio of AA to cellulose, the pH of adsorption medium and the initial MB concentration on dye adsorption capacity of hydrogels were investigated. The adsorption isotherm and kinetics fit the Langmuir model and the Pseudo-second-order model well, respectively. Desorption was carried out in weak acid solution and 70% MB could be removed, suggesting the C-g-AA hydrogels had the potential for reuse. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Toxics
·
2023
·Vol. 11
·期 9
·763
·
IF 4.6
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
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DOI
PubMed
高影响因子
WATER RESEARCH
·
2014
·
IF 5.323
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.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
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.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 2
·819
·
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
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DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·1-22
·
IF 2.533
Yang Chunyan,Xue Ziwei,Yin Hao,Lu Ke,Liu Wei
In this work, the photodegradation of methylene blue was investigated by constructing a novel photocatalysis reactor, which was filled with aqueous foam. Nanoscale TiO 2 particles were used as photocatalyst. In order to obtain stable foam phase, cetyl trimethyl ammonium bromide (CTAB) was used as the frother, and its suitable initial concentration in the feeding solution was 0.20 g/L. Under the suitable conditions of loading liquid volume 200 mL, initial concentration of TiO 2 nano-catalysts in the feeding solution 5.0 g/L, inner diameter of foam column 18 mm, aperture diameter of gas distributor 125 μm, and circulating velocity of bulk solution 500 mL/h, the maximum degradation percentage of methylene blue was 97.6 ± 1.2%. Atomic force microscopy (AFM) analysis suggested that the entrainment effect of rising bubbles and the circulation flow of bulk solution inside the aqueous foam did not cause the conspicuous aggregation of TiO 2 nano-catalysts under the suitable conditions, but their surface roughness decreased. Meanwhile, foam entrainment had not a significant impact on the polydispersity of TiO 2 nano-catalysts. In contrast to the photodegradation of methylene blue in aqueous solution, the photocatalysis process using aqueous foam is the intensity of light received by TiO 2 nano-catalyst increases, and irradiation period is less. This work is expected to provide new insight into the rational design of photocatalysis reactor, to facilitate the harmless treatment of dyestuff wastewater. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）