RSC Advances
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2019
·Vol. 9
·期 51
·29533-29540
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IF 3.049
Dan Zhao,Xuemei Liu,Chunjin Wei,Yimo Qu,Xincai Xiao,Han Cheng
The synthesis of carbon dots (CDs) with long wavelengths, particularly the red-emitting ones, has always been the focus of researchers, and a carbon source is critical in this process. In this study, we report the synthesis of red-emitting CDs (CD-tetra) via a one-step solvothermal method with 1,2,4,5-benzenetetramine tetrahydrochloride as a novel carbon source and ethanol as a solvent, and the quantum yield (QY) of CDs is as high as 30.2%. Middle chromatography isolated gel (MCI Gel) column was used to obtain R-CDs, O-CDs and Y-CDs with emission wavelengths at 619, 608 and 554 nm, respectively. It was discovered that these CDs exhibited great differences in their particle sizes and elemental compositions. Moreover, the fluorescence of the CD-tetra could be efficiently quenched using methylene blue (MB). Under optimal conditions, a linear relationship between the decreased fluorescence intensity of the CD-tetra and the concentration of MB was established in the range of 0.05–9.5 μM. The limit of detection (LOD) is 10 nM, suggesting a promising assay for the detection of MB.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 94
·期 5
·1638-1650
·
IF 2.659
Yingqing Zhan,Shumei Zhao,Xinyi Wan,Shuangjiang He
Background The development of efficient and sustainable adsorbents is still a challenge for dye removal in practical applications. Here a method to prepare hierarchical Fe 3 O 4 -derived organic/inorganic hybrid adsorbents for methylene blue removal is demonstrated. Typically, two different structured magnetic nanoparticles were synthesized through solvothermal route and chemical co-precipitation (named as S-Fe 3 O 4 and C-Fe 3 O 4 respectively), which were further functionalized by a novel modified mussel-inspired method with dopamine (DA) and (3-aminopropyl)triethoxysilane (KH550), thus obtaining core-shell Fe 3 O 4 /poly(DA + KH550) adsorbents. Results The effects of microstructure, morphology and surface functionalization on the adsorption performance of core-shell Fe 3 O 4 adsorbents were systematically investigated, thus achieving target structurally optimized core-shell Fe 3 O 4 adsorbents. Especially, the maximum adsorption capacity of core-shell S-Fe 3 O 4 /poly(DA + KH550) adsorbent reached 400.00 mg g −1 because of high specific surface area and abundant active adsorption sites. In addition, the adsorption kinetics and adsorption isotherm fitted a pseudo-second-order model and Langmuir model respectively. Conclusion The recycling process of adsorbent is sustainable in economy and energy by applying an external permanent magnet. In summary, the high adsorption capacity, easy separation and excellent reusability of S-Fe 3 O 4 /poly(DA + KH550) core-shell adsorbents make them promising for dye effluent removal. © 2019 Society of Chemical Industry
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Zhang,Liangyun Yu,Chenchen Xu,Jinyong Zhao,Haiyang Pan,Ming Chen,Qi Xu,Guowang Diao
Herein, a kind of Fe 3 O 4 @C@Ru hybrid nanocomposites was successfully synthesized by a three-step process. The as-prepared products were characterized by X-ray powder diffraction, transmission electron microscopy , high-resolution transmission electron microscopy , energy dispersive spectroscopy , X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectrometry and photoluminescence emission spectrometry . The Ru nanoparticles loaded on the surface of carbon shell on Fe 3 O 4 @C nanospheres were nearly spherical with an average diameter of less than 5 nm. The photodegradation of methylene blue (MB) was carried out under the irradiation of simulated visible light to investigate the catalytic activity of the introduced nanomaterial . The results showed that the catalytic activity of Fe 3 O 4 @C@Ru nanocomposites in the MB photodegradation was higher than that of Fe 3 O 4 nanospheres or of Fe 3 O 4 @C nanospheres, as they could degrade 92.70% of the dye in 140 min of simulated sunlight irradiation without any other oxidant or reductant. The photodegradation reaction was first-order with the rate constant of 0.0176 min −1 at room temperature . The degradation rate of Fe 3 O 4 @C@Ru nanocomposites decreased very slightly after five cycles. Furthermore, they could be easily separated and recycled by using an external magnet. It indicated that the magnetically recoverable Fe 3 O 4 @C@Ru nanocomposites had a very broad application prospect in the field of environmental protection.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Worku Lakew Kebede,Dong-Hau Kuo,Misganaw Alemu Zeleke,Kedir Ebrahim Ahmed
Environmentally toxic methylene blue organic pollutants are of more concerns due to their antagonistic effects on human health, animals, and plants, thus needs serious attention for their removal. For elimination purpose, the Sb-doped Mo(O,S) 3 oxy-sulfide nanoplate catalyst with different Sb contents was synthesized at low temperature of 95 °C via a facile method. The structural, morphological, chemical composition, optical properties , and electrical conductivity of the catalyst were characterized with different techniques. The photocatalytic performance of Sb-Mo(O,S) 3 at various Sb contents was investigated for the degradation of methylene blue dye under visible light irradiation using hydrogen peroxide as an effective electron scavenger to further accelerate the reaction. It was observed that the incorporation of Sb enhanced the catalytic activity. Sb-Mo(O,S) 3 -10 was the most efficient catalyst with excellent activity to degrade 99.7% of the dye within 60 min irradiation time. The degradation kinetics follows a pseudo-first-order reaction with a rate constant 8.78 × 10 −2 min −1 , which is 3-fold higher than that for Sb- Mo(O,S) 3 -0 catalyst. Sb-Mo(O,S) 3 -10 showed slower recombination of photogenerated charge carriers and lower charge transfer resistance which proved to be capable for the removal of toxic methylene blue organic pollutant.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 95
·期 3
·665-674
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IF 2.659
Yating Liu,Ming Li,Qingyan Zhang,Picai Qin,Xiandong Wang,Guannan He,Ling Li
BACKGROUND The photocatalytic activity of a pristine semiconductor is unsatisfactory due to the rapid recombination of photogenerated electrons and holes. Constructing composite photocatalysts has proven to be an effective method to suppress electron–hole recombination. The composites composed of two materials usually are synthesized through a two-step process. However, in this work, a simple one-step solvothermal method employing an homogeneous reaction system was adopted to synthesize a tungsten trioxide (WO 3 )-copper sulfide (CuS) nanosheet heterojunction with enhanced photocatalytic properties. RESULTS The formation of the WO 3 -CuS heterojunction was confirmed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray and X-ray photoelectron spectroscopy analysis. The composites showed improved visible light harvesting ability, and enhanced photoelectric and photocatalytic properties compared with pure WO 3 . The optimized composite displayed a photocurrent almost five-fold greater than the sum of the photocurrents of WO 3 and CuS, and had superior performance for methylene blue (MB) degradation and hexavalent chromium [Cr(VI)] reduction. The MB degradation and Cr(VI) reduction efficiencies were both improved when they co-existed in the photocatalytic system. Interferential ions Cl − and NO 3 − were much less effective in the degradation of MB than in the reduction of Cr(VI). CONCLUSIONS Improved photocatalytic activity was achieved after coupling CuS with WO 3 , due to the enhanced visible light absorption and efficient electron–hole separation. Photogenerated holes were found to be the dominant reactive species in the MB photodegradation process. A synergistic effect existed between MB degradation and Cr(VI) reduction. Interferential ions Cl − and NO 3 − had much greater effect on Cr(VI) reduction than MB degradation. © 2019 Society of Chemical Industry
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Bo Yang,Peng Zhou,Xin Cheng,Haishen Li,Xiaowei Huo,Yongli Zhang
This study aimed to investigate the simultaneous removal of methylene blue (MB) and total dissolved copper (TCu) by heterogeneous zero-valent iron (ZVI) Fenton-like system (ZVI/H 2 O 2 ) and elucidate the mechanism of synergistic effect for co-contaminants removal. Hydroxyl radical ( OH) formation was hypothesized to be the dominant pathway for the oxidation of MB, confirmed by the quenching experiments and ESR analysis. And the synergistic effect of TCu and ZVI greatly promoted the release of Fe 2+ , further accelerating the generation of hydroxyl radical ( OH) via Fenton reaction. The generation process of OH was unveiled by quenching experiments and electron spin resonance (ESR) analysis, while the processes of ZVI corrosion and TCu reduction were revealed through several characterization approaches including SEM , XRD , FTIR and XPS . The degradation pathway of MB was also investigated by LC-MS analysis. The MB initial concentration, TCu initial concentration, H 2 O 2 dosage, ZVI dosage and initial solution pH could play crucial roles in the removal of MB and TCu. The influence of water matrix including inorganic anions (Cl − , NO 3 − , HCO 3 − ) and actual water was finally conducted to elucidate the role of natural organic matter (NOM) in the environmental systems.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Liheng Liu,Dongwei He,Fei Pan,Rong Huang,Hua Lin,Xuehong Zhang
In this study, Fe/Cu, Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C internal electrolysis systems (IESs) were constructed and used to treat methylene blue dye (MB) wastewater. The effects of filler mass ratio, filler dosage, solution pH, reaction time and reaction temperature on COD removal were discussed, while the kinetics, thermodynamics and mechanism of COD removal were also investigated. The results showed that when the COD removal rates were basically the same, the reaction times of Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C IESs were shorter, and the filler dosages were lower. For the four systems, the appropriate pH was around 5, while the suitable reaction temperature was in the range of 20–25 °C. The COD removals of these four IESs were generally greater than 90%. The COD removal processes of the four systems could be better described by the improved pseudo-second-kinetic model, and the liquid film diffusion was the rate-controlling step. Moreover, the COD removal was a spontaneous and endothermic process. MB was degraded into inorganic substances in four steps. In addition, the FTIR characterization of the fillers before and after reaction suggests the four IESs have good stability.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qiang Huang,Meiying Liu,Junyu Chen,Qing Wan,Jianwen Tian,Long Huang,Ruming Jiang,Fengjie Deng,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
The removal of organic dyes using functionalization SiO 2 composites (denoted as SiO 2 -PDA-CSH) were prepared via a facile method that combined with mussel inspired chemistry and Kabachnik–Fields (KF) reaction. The size and surface morphology, chemical structure, thermal stability, surface charging property, and elemental composition were evaluated by means of transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), zeta potential, and X-ray photoelectron spectroscopy (XPS), respectively. The results demonstrated that the organic functional groups can be successfully introduced onto the surface of SiO 2 microspheres through the combination of mussel inspired chemistry and KF reaction. The removal of cationic dye methylene blue (MB) by the raw SiO 2 and SiO 2 -PDA-CSH composites was examined and compared using a series of batch adsorption experiments. The results suggested that SiO 2 -PDA-CSH composites had a 3-fold increase in the adsorption capacity towards MB than that of pure SiO 2 microspheres and the adsorption process was dependent on the solution pH. According to the adsorption kinetics, the adsorption of MB onto SiO 2 -PDA-CSH composites was well described by pseudo-second-order kinetic model. The equilibrium data were fitted with Langmuir and Freundlich isotherm models with R 2 = 0.9981 and R 2 = 0.9982, respectively. The maximum adsorption capacity from Langmuir isotherm was found to be 688.85 mg/g. The adsorption thermodynamics was also investigated in detailed. The parameters revealed that the adsorption process was spontaneous and endothermic in nature. The adsorption mechanism might be the synergistic action of physical adsorption of SiO 2 -PDA-CSH particles and electrostatic interaction between the MB and functional groups on the surface of SiO 2 -PDA-CSH composites, including sulfydryl, amino, aromatic moieties, and phosphate groups. Taken together, we developed a novel and facile strategy for the surface modification of SiO 2 to achieve high adsorption towards MB based on the mussel inspired chemistry and multicomponent KF reaction. More importantly, this strategy could be easily extended for fabrication of many other high efficient adsorbents due to the universality of mussel inspired chemistry and various multicomponent reactions based on amino groups. Therefore, this work will open a new avenue and direction for the environmental applications of mussel inspired chemistry.
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MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Jixiang Xu,Jianyang Gao,Yong Liu,Qingyun Li,Lei Wang
A facile method for fabrication of In 2 O 3 /Co 3 O 4 @palygorskite composites from a Co/In-based metal-organic framework (MOF) was reported. First, Co/In-MOFs hybridized with palygorskite (PAL) was prepared via a one-pot solvothermal method. Second, In 2 O 3 /Co 3 O 4 @PAL composites were obtained by pyrolysis of In 2 O 3 /Co 3 O 4 @PAL in air. It was found that the In 2 O 3 /Co 3 O 4 @PAL composite exhibited higher photocatalytic activities than In 2 O 3 /Co 3 O 4 to the degradation of MB and TC under visible-light irradiation. About 99% of MB (within 40 min) and 80% of TC (within 120 min) were degraded using In 2 O 3 /Co 3 O 4 @5.0%PAL as catalyst. It was supposed that the efficient adsorption of MB and TC, and electrostatic interactions between electron–hole and PAL were responsible for such improvement. The photocatalytic degradation mechanisms of MB and TC on the In 2 O 3 /Co 3 O 4 @PAL were investigated. This work shows that hybridization MOFs with PAL could enhance the photocatalytic properties of MOFs-derived metal oxides for water treatment.
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Plasma Processes and Polymers
·
2025
·
IF 2.9
Longwei Li,Xiaoyan Sun,Xiaoyue Sun,Jiahui Kang,Fan Liu
A comb shaped surface dielectric barrier discharge (SDBD) reactor coupled with polyvinylidene fluoride (PVDF)/Fe 3 O 4 composite nanofibers was investigated to degrade methylene blue (MB) in water. The PVDF/Fe 3 O 4 nanofibers with a rough surface were prepared when the proportion of Fe 3 O 4 NPs in a 14 wt% PVDF spinning solution was 7 wt%. Compared to SDBD plasma alone, the addition of PVDF/Fe 3 O 4 nanofibers significantly increased the degradation rate, degradation amount, kinetic constant, energy efficiency, and chemical oxygen demand removal rate of the MB solution. Active species trapping test revealed that •OH played the most important role during MB degradation, •O 2− , H 2 O 2 , electrons, and holes were also crucial. After five repeated uses, the PVDF/Fe 3 O 4 nanofibers maintained high catalytic activity, chemical stability, and mechanical strength.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Naiku Xu,Xiangyuan Yan,Xuhai Zong,Nana Huang,Jian Zhao
The combination of GO decoration, PAA wet-spinning, Fe 3+ /Al 3+ co-coordination with PANI coating was adopted to fabricate mechanically applicable core-shell structured fiber. Since GO could rely on its abundant oxygen-containing functional groups to interact with the carboxylic groups of PAA through hydrogen bonding and esterification crosslinking, GO decoration was expected to enhance the mechanical properties and water resistance of PAA matrix. Thanks to PANI-adjusted Fe 3+ /Fe 2+ cycling, mass content of Fe 2+ in PANI-coated fiber reached 0.08%, increasing by 242% compared to that of fibrous core. After the third cycle, Fe 2+ mass content was 0.09% and higher than original content, and after 60 cycles, Fe 2+ mass content was still as high as 0.09%; thus the resulting fiber could quickly catalyze H 2 O 2 to mineralize 90% of MB during cyclic application. Due to strong PANI-induced iron ion-anchoring ability, iron ion leaching was only 0.36 mg/L during 60 cycles and less than 7% of that of fibrous core, so that the PANI-coated fiber could use its retained iron species to repeatedly decolorize MB at least 60 times. Since PANI shell could serve as an all-in-one locality to ensure Fe 3+ /Fe 2+ cycling, pollutant mineralization, and iron ion anchoring, the fiber prepared herein presented its own superiority in treating dye wastewater.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2024
·Vol. 31
·期 1
·1-13
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IF 3
Wu Jinze,Yao Jiale,Zhu Xiping,Zuo Danying,Zhang Hongwei,Jiang Shuai,Li Hongjun
Most hydrogels for dye treatment only have the adsorption ability for anionic or cationic dyes, while a few zwitterionic hydrogels that can adsorb both anionic and cationic dyes need a complicated regeneration process when they are reused. To prepare reusable zwitterionic adsorbent hydrogels, in this paper, a zwitterionic composite hydrogel with Ag@g-C 3 N 4 was prepared, which not only can adsorb both anionic and cationic dyes but also has photocatalytic degradation ability. The scanning electron microscopy images show that the optimum hydrogel has a large number of micro pores for dye adsorption. The adsorption capacity of the hydrogel achieves the highest in mixed dye concentration of 50 mg·L -1 with pH value of 7–9. Benefiting from the synergistic effect of adsorption and photocatalytic degradation, the removal efficiency of methyl orange and methylene blue in mixed dyes was up to 93.86% and 91.80%, respectively. The photocatalytic activity trapping experiments showed that superoxide radicals as well as hydroxyl radicals played a major role in photocatalytic degradation. After 5 consecutive photocatalytic degradations, the removal ratio of the hydrogel for dyes was still above 80%, indicating good photocatalytic degradation and reusability properties. This research suggested the zwitterionic composite hydrogel has a promising prospect in removing dyes from wastewater treatment.
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