SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaoli Huang,Siyu Wang,Xinqi Wang,Jiasheng Shi,Liuqian Bao,Yanyan Wang,Zhiyong Chen
It is a challenging issue to simultaneously achieve high separation efficiency and high separation speed in a continuous flow separation process. Herein, inspired by reverse wood porous structure, the first example of artificial reverse wood-like polymer with horizontal aligned porous structure is shown in poly(itaconic acid) (PIA) cryogel fabricated by horizontal placement in situ cryo-polymerization technique. The vertical aligned porous PIA cryogel, as wood-like type control, is also constructed under the identical conditions except placement direction. After examined by a series of characterization, the horizontal PIA cryogel displays multiple similarities in comparison with the vertical one, including pore size, surface area, composition, carboxylic group content and wetting ability; but it shows significant difference in porous orientation and compressive property compared to the counterpart. Based on static and dynamic adsorption tests, methylene blue adsorption on the two columns obeys similar mathematics models, and the maximum static adsorption achieves 172.4 mg/g on the horizontal PIA column and 170.2 mg/g on the vertical PIA column based on Langmuir model, respectively; but in a continuous flow mode, the horizontal PIA column shows 126.2 mg/g dynamic adsorption, which is much higher than that obtained on the vertical one (76.3 mg/g) in terms of Thomas model. The adsorbent utilization efficiency of the reverse wood mimetic column is 73.2 % at 500 mg/L dye concentration and at 25 mL/min flow rate, which is superior to most of those reported in literature. The artificial wood-like column thereafter reaches high efficiency of cross flow filtration for rapid continuous removal of dye molecules from complex emulsion wastewater.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Baoshan He,Xiaoze Dong
In this work, the feasibility of a novel sensitive electrochemistry aptasensor for the detection of patulin (PAT) using hierarchically porous metal organic [email protected] blue connection aptamer as signal tags was demonstrated. The substrate electrode of the aptasensor was prepared by electrodeposited gold nanoparticles (AuNPs) on chitosan-zinc oxide nano flower-modified electrode. Subsequently, the complementary single-stranded DNA was attached to the surface of the modified electrode by Au-S bond. Signal tags self-assemble on the surface of modified electrodes by aptamer-cDNA binding, while methylene blue as mediator for electrochemical detection. Thanks to the large specific surface area provided by zinc oxide nano flower, the electrode can load more signal tags and AuNPs to achieve signal amplification. In presence of PAT, Apt preferentially binds to PAT, causing dissociation of some Apt-cDNA and releasing some signal tags leading, resulting in decreased electrical signals. Under optimal conditions, the change in electrochemical signal was proportional to the logarithm of PAT concentration, from 5 × 10 −8 -5 × 10 -1 μg mL −1 , and the detection limit was estimated to be 1.46 × 10 -8 μg mL -1 . The aptasensor exhibited aceptable reproducibility, renewability, long-term stability and specificity. Moreover, aptasensor was reliable in determination of PAT in spiked apple juice samples.
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CHEMICAL PHYSICS LETTERS
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2021
·
IF 2.328
Qi Zhang,Liangyun Yu,Bairen Yang,Chenchen Xu,Wang Zhang,Qi Xu,Guowang Diao
Herein, Fe 3 O 4 @Ru-doped TiO 2 photocatalyst was developed successfully by a facile chemical strategy. The sample with 0.2% doping Ru showed the best photocatalytic activity, which could photodegrade 70.20% of methylene blue after 120 min of simulated sunlight exposure, and kept good degradation efficiency and recovery after 5 cycles. It could be attributed that the Ru-doping alleviated the band gap energy to make the electron-hole pairs easier to generate and enhanced the synergistic effect to increase the carrier separation efficiency. The present work provided a development prospect of simple preparation of recoverable photodegradation catalyst for environmental organic pollutants.
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Scientific Reports
·
2022
·Vol. 12
·期 1
·1-17
·
IF 4.996
Basha Islam K.,Abd El-Monaem Eman M.,Khalifa Randa E.,Omer Ahmed M.,Eltaweil Abdelazeem S.
New multi-featured adsorbent beads were fabricated through impregnation of sulfonated graphene (SGO) oxide into cellulose acetate (CA) beads for fast adsorption of cationic methylene blue (MB) dye. The formulated SGO@CA composite beads were thoroughly characterized by several tools including FTIR, TGA, SEM, XRD, XPS and zeta potential. The optimal levels of the most significant identified variables affecting the adsorption process were sequential determined by the response surface methodology (RSM) using Plackett–Burman and Box–Behnken designs. The gained results denoted that the surface of SGO@CA beads displayed the higher negative charges (− 42.2 mV) compared to − 35.7 and − 38.7 mV for pristine CA and SGO, respectively. In addition, the floated SGO@CA beads demonstrated excellent floating property, fast adsorption and easy separation. The adsorption performance was accomplished rapidly, since the adsorption equilibrium was closely gotten within 30 min. Furthermore, the adsorption capacity was greatly improved with increasing SGO content from 10 to 30%. The obtained data were followed the pseudo-second order kinetic model and agreed with Langmuir adsorption isotherm model with a maximum adsorption capacity reached 234.74 mg g −1 . The thermodynamic studies designated the spontaneity and endothermic nature of MB dye adsorption. Besides, the floated beads exposed acceptable adsorption characteristics for six successive reuse cycles, in addition to their better adsorption selectivity towards MB dye compared to cationic crystal violet and anionic Congo red dyes. These findings assume that the formulated SGO@CA floated beads could be used effectively as highly efficient, easy separable and reusable adsorbents for the fast removal of toxic cationic dyes.
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PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 16
·4975
·
IF 4.412
Xuan Zhang,Yunhua Hui,Changling Fang,Yuan Wang,Feng Han,Xiaoyi Lou,Essy Kouadio Fodjo,Youqiong Cai,Cong Kong
A sensitive and reliable method was developed to determine methylene blue (MB) and its metabolite residues, including azure A (AZA), azure B (AZB), and azure C (AZC) in aquatic products by HPLC–MS/MS. The samples were extracted by acetonitrile and cleaned up by alumina-neutral (ALN) cartridges. The analytes were separated on a Sunfire C18 column (150 mm × 2.1 mm, 5 µm). The method was validated according to the European criteria of Commission Decision 2002/657/CE. Good linearity between 1–500 µg/L was obtained with correlation coefficients (R2) greater than 0.99. The limit of quantification (LOQ) was 1.0 µg/kg. The average recoveries at three levels of each compound (1, 5, and 10 µg/kg) were demonstrated to be in the range of 71.8–97.5%, with relative standard deviations (RSDs) from 1.05% to 8.63%. This method was suitable for the detection of methylene blue and its metabolite residues in aquatic products.Keywords:high-performance liquid chromatography–tandem mass spectrometry;methylene blue;disinfectant;aquatic products
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Qingrong Wang,Xiaoman Lei,Fei Pan,Dongsheng Xia,Yuji Shang,Weiliang Sun,Wen Liu
A novel composite material which is referred to as activated carbon fibre supported titanate nanotubes (TNTs@ACF) was used for the removal of methylene blue (MB) from water through the combined adsorption and photocatalysis . TNTs@ACF was synthesized through a one-step hydrothermal method , which was composed of the activated carbon fibre as the skeleton and supported titanate nanotubes . TNTs@ACF showed a large surface area of 540.7 m 2 /g, thus, facilitating adsorption and interaction with MB. TNTs@ACF could first pre-concentrate MB molecules onto the material and then degrade under UV light irradiation . The first-order model simplified from the Langmuir-Hinshelwood (L-H) model can well describe the photodegradation of MB on TNTs@ACF. Moreover, TNTs@ACF could be reused without significant capacity loss by UV light photo-regenerated. The structure and morphology of TNTs@ACF were indicated by TEM , SEM, and EDS , and it is found that TNTs were highly dispersed on the surface of ACF. XRD , FTIR , and XPS analyses of TNTs@ACF before and after the MB photodegradation also indicated the stability of the material. The combined adsorption and photodegradation suggests that TNTs@ACF is an attractive material for maintainable remediation of organic pollution in the environment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 39
·58762-58772
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IF 5.19
Ye Qi,Yang Miao,Li Wen,Dong Zhen,Qi Wei,Zhao Long
In the present work, the degradation of methylene blue (MB) was investigated by electron beam irradiation combined with graphite carbon nitride/carbon nanodots (EBI&g-C 3 N 4 /CDs). In comparison with EBI alone, the EBI&g-C 3 N 4 /CDs method showed a higher removal efficiency of high concentrations of MB (500 mg L −1 ) from aqueous solution. Investigation on the effect of the synthesized g-C 3 N 4 /CDs revealed that CDs and g-C 3 N 4 were both contributing factors, while the latter could enhance the degradation of MB through surface reactions that occurred after adsorption. Experiments on the existence of hydrogen peroxide revealed the synergistic effect between g-C 3 N 4 /CDs and hydrogen peroxide. An excellent degradation effect was obtained at natural pH, and the total organic carbon was significantly reduced. Regeneration experiments revealed that the g-C 3 N 4 /CDs material has good stability and reusability. The studies in the presence of assorted radical scavengers suggested that ·OH played a vital role in the degradation process and a total of 17 intermediates were detected using liquid chromatograph-mass spectrometer (LC-MS) analysis. The possible degradation mechanisms of MB were proposed.
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Results in Chemistry
·
2025
·
IF 4.2
Worku Lakew Kebede,Molla Tefera,Amogne Wondu,Melesse Ababay,Abrha Berhe,Mengistu Mulu,Atnafu Guadie
Water contamination caused by textile and industrial dyes is currently among the most important issues facing humanity that require urgent attention. Organic pollutants are harmful and can cause cancer in both humans and aquatic life. Even small amounts of these pollutants in water can lead to grave health problems. One promising way to clean up these pollutants is through degradation, using oxysulfide-based photocatalysts. These materials are effective because of their advanced optical and structural properties. The Sn-Mo(O,S) 3 catalysts were prepared through an easy precipitation process conducted at low temperatures. Different techniques were used to examine the catalyst's shape, structure, electrical properties, chemical makeup, and how it interacts with light. The Sn-Mo(O,S) 3 oxy-sulfide nanoparticle was successfully used to break down organic pollutants through photocatalytic processes. Among the samples made, the SMOS-25 catalyst showed the best performance in breaking down methylene blue dye. The effectiveness of the SMOS-25 catalyst was tested by seeing how well they could break down organic dye pollutant when exposed to visible light. The SMOS-25 nanoparticle was able to remove 98.9 % MB dye from water within 105 min under visible light. In this system, the main substance responsible for breaking down the dye is hydroxyl radical ( • OH).
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ECS Journal of Solid State Science and Technology
·
2017
·Vol. 6
·期 4
·M36
·
IF 1.787
Maher Jabeen,Muhammad Ishaq,Weiming Song,Liyang Xu,Iram Maqsood,Qigang Deng
The requisite to obtain reduced graphene oxide as an individual sheet and to maintain it in the reduced form introduces a new way of manipulative nanocomposite systems (e.g., semiconductor or metal nanoparticle and graphene composite). Herein, we developed a simple suitable UV-.assisted photocatalytic reduction method to prepare the most viable nanocomposite ZnO/RGO. Graphene oxide undergoes reduction reaction in ethanol- water system as it accepts electrons from UV irradiated semiconductor (ZnO), and subsequently characterized using different standard techniques. The presence of graphene in the composites were confirmed by X-ray diffraction (XRD), Raman, FTIR, SEM, TEM, and X-ray photoelectron spectroscopy (XPS) analysis. The highly efficient ZnO/RGO nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methylene blue, with a maximum removal rate of (∼80%) as compared with pure ZnO nanoparticles (∼68%). This effective increase in degradation were caused by the prevention of electron–hole pair recombination in ZnO with the introduction of RGO. These findings suggest that the synthesized ZnO/RGO nanocomposite via photocatalytic approach not only offers UV-assisted reduction technique, but also open up a new way to obtain photoactive graphene-semiconductors, which could be effectively used in various application.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 20
·6116
·
IF 4.412
Yixin Zhang,Rumeng Wang,Guofeng Qiu,Wenke Jia,Yang Guo,Fanhui Guo,Jianjun Wu
A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag foam flotation obtained carbon residue (GFSF) as raw material and an adsorbent to carry out an adsorption test on waste liquid containing methylene blue (MB). The effects of activation parameters (GFSF/KOH ratio mass ratio, activation temperature, and activation time) on the cation exchange capacity (CEC) of GFSA were investigated. The total specific surface area and pore volume of GSFA with the highest CEC were 574.02 m2/g and 0.467 cm3/g, respectively. The degree of pore formation had an important effect on CEC. The maximum adsorption capacity of GFSA on MB was 19.18 mg/g in the MB adsorption test. The effects of pH, adsorption time, amount of adsorbent, and initial MB concentration on adsorption efficiency were studied. Langmuir isotherm and quasi second-order kinetic model have a good fitting effect on the adsorption isotherm and kinetic model of MB.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Tao Tang,Chengcai Li,Wenyu He,Wei Hong,Hailin Zhu,Guojin Liu,Yuan Yu,Caihong Lei
In this paper, the ZIF-8/ZnO mixture was sintered at high temperature to prepare C-ZnO composite nano-particles with excellent photocatalytic degradation ability under ultraviolet light , and then blended with PVDF to fabricate PVDF composite membrane with capabilities of photocatalytic degradation of methylene blue(MB) via solution phase conversion. The results show that the photocatalytic performance of the prepared C-ZnO composite particles was the best when the ZIF-8/ZnO mass ratio was 1:2, and the photocatalytic degradation efficiency of the PVDF composite film prepared was as high as 95.02% when the composite particle content was 15%. The photocatalytic activity of C-ZnO composite material benefits from the synergy between the two. Moreover, the efficiency of photodegradation of MB remained above 90% after the composite membrane was subjected to five cycles of experiments, which solved the problem that the traditional photocatalyst was difficult to recycle. In addition, it is found that O 2 - plays a major role in the photocatalytic degradation of MB through free radical capture experiments. All in all, the PVDF composite membrane containing C-ZnO composite particles has a foreseeable potential in the field of photocatalytic printing and dyeing wastewater in the future.
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APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Xia Wan,Meng Yuan,Shao-long Tie,Sheng Lan
By a hydrothermal method combining a subsequent calcination process, series of nano-scale NiO samples with different morphologies and sizes were synthesized and characterized. The effects of synthesis conditions including using different alkali reactants and being calcined at different temperatures on the characters of NiO samples have been investigated. In these characters the integrality of crystal structure and the crystallinity of NiO were found to become the determinative factors which affect the photocatalytic activity and process of NiO catalyst in the degradation of methylene blue (MB). The NiO sample which has a good crystallinity and small particle size (≤100 nm) possesses more shallowly trapped holes to react with chemisorbed oxhydryl OH − or H 2 O to generate OH radicals, exhibiting a high photocatalytic activity, furthermore, in this UV/NiO suspension the photocatalytic oxidation process of MB occurrs via the attack by OH radicals. The NiO sample which has a higher crystallinity and bigger particle size (>200 nm) possesses more deeply trapped holes ( h vb + ) to react directly with physisorbed organism, exhibiting a low photocatalytic activity, therefore, in this system the MB is oxidized by direct reacting with holes ( h vb + ).
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