MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Liping Sheng,Yun Zhang,Fujuan Tang,Shiquan Liu
The chemical and mineral compositions, particle size, hydrothermal dissolubility of four silica sands with different origins, including two sands from crushed quartz stones, one from a desert and one from a sea bed deposit, and their availability to synthesize nanoporous silica have been carefully analyzed and compared. The results indicate that irrespective of the chemical composition and crystallinity, the four sands show similar dissolution trends in alkaline solutions under hydrothermal conditions, that is, the dissolubilities of the sands increase with treatment temperature, time and the alkaline concentration. The main difference in the dissolubilities of the four sands is correlated with the differences in the sand particle size. The larger the size, the smaller the dissolubility. The dissolved silica solutions were successfully used as silica source to prepare mesoporous/microporous silicas without significant difference. The yield of the synthesized silicas decreases sharply when the pH of the dissolved silica sand solution was adjusted to be higher than 9.5. The meso- and micro-silicas prepared at pH of 9.5 and 11 using the cheaper sand from a desert were evaluated in the fixed-bed adsorption of methylene blue (MB) from aqueous solution. It is found that both silicas have good fixed-bed performance toward MB. And the adsorption well fits the Thomas model. The column packed with the microporous silica has longer breakthrough and exhaustion times than with the mesoporous one.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 23
·
IF 1.86
Shuai Han,Ting Wang,Bin Li
A novel TiO 2 hydrogel cage model was built for the removal of methylene blue (MB), an organic pollutant. This TiO 2 hydrogel cage was prepared with the biomass materials of hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and this hydrogel cage structure was characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The contents of the encased TiO 2 and its swelling properties with different CMC proportions of this hydrogel cage were studied to obtain a suitable crosslinking network structure and optimal synthesis conditions. Compared to an equivalent amount of pure TiO 2 , the much higher removal efficiency of MB with our prepared TiO 2 hydrogel cage was attributed to the synergistic effect of the photocatalytic degradation for TiO 2 and the adsorption enrichment for cellulose hydrogels. Furthermore, the adsorption kinetics of the intraparticle diffusion model were used to study the adsorption enrichment process of the TiO 2 hydrogel cage. In addition, on the basis of the results of photocatalytic degradation and recycling experiments, excellent performances with respect to self-cleaning, regenerative ability, and easy recovery, were shown for this HEC–TiO 2 –CMC cage material, which demonstrated ideal application potential for MB removal. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44925.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Ya Liu,Yidan Shi,Xiang Liu,Hexing Li
In this paper, novel photocatalyst Bi 2 S 3 /TiO 2 /RGO composites were successfully fabricated by a facile solvothermal method. During this process, TiO 2 was coupled with Bi 2 S 3 to generate Bi 2 S 3 sensitized TiO 2 nanoparticles, and graphene oxide (GO) was reduced to reduced graphene oxide (RGO), which was uniformly covered with plenty of Bi 2 S 3 and TiO 2 . The as-prepared samples were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), specific surface areas (BET), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoluminescence (PL) spectroscopy. The results confirmed that Bi 2 S 3 could act as an optical filter, which could be activated under visible light. And the introduction of Bi 2 S 3 could improve the response of TiO 2 nanoparticles for visible light. In addition, the Bi 2 S 3 /TiO 2 in Bi 2 S 3 /TiO 2 /RGO composites had more uniform dispersion on the surface of graphene with less agglomeration in comparison with the Bi 2 S 3 /TiO 2 . Graphene can provide conductive electron channels for separation of the electrons and inhibit the recombination of electrons and holes. Furthermore, the photocatalytic activity of Bi 2 S 3 /TiO 2 /RGO composites was evaluated through the degradation of methylene blue (MB) under visible light irradiation. The Bi 2 S 3 /TiO 2 /RGO composites showed the highest photocatalytic activity among the referred photocatalysts, with about 3-fold increase in photocatalytic efficiency over TiO 2 nanoparticles. The mechanism of high photocatalytic activity was also discussed.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 91
·88897-88903
·
IF 3.289
Na Wang,Xiaofeng Li,Jing Yang,Yuxia Shen,Jin Qu,Song Hong,Zhong-Zhen Yu
To enhance the recyclability while maintaining the high efficiency for the removal of organic dyes, monolithic polyurethane@reduced graphene oxide@manganese dioxide (PU@RGO@MnO2) hybrid sponge with a hierarchical structure and satisfactory flexibility is fabricated by self-assembly of RGO on a PU sponge followed by uniform coating of MnO2 nanoparticles onto RGO by means of an in situ redox reaction between RGO and KMnO4. RGO acts as an ideal substrate to accommodate MnO2 nanoparticles and prevents their aggregation, whereas the numerous hydrophilic MnO2 nanoparticles play dual roles of adsorption and catalytic degradation of methylene blue (MB) dye. The resultant hybrid sponge shows a hierarchical porous structure that provides fast transport channels and abundant active sites, benefiting the diffusion and removal of MB. By enhancing the mass transfer with the help of a micro-pump, the monolithic hybrid sponge acts as a filter for dye removal. Under the dynamic mode, the adsorption efficiency of the PU@RGO@MnO2 hybrid sponge for MB (50 ppm, 30 mL) reaches 94% after 20 min, whereas it is as low as 5% under the static mode. With the assistance of H2O2, the removal efficiency of the hybrid sponge is 96% at first time under the dynamic mode, whereas it is only 14% in the static mode. The monolithic hybrid sponge is highly efficient in adsorption and catalytic degradation of MB based on an adsorption–oxidation–desorption process. Even after being used 4 times, it still maintains excellent removal efficiency and recyclability.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 88
·85213-85221
·
IF 3.289
Qiang Huang,Leichun Liu,Guangjian Zeng,Meiying Liu,Liucheng Mao,Hongye Huang,Fengjie Deng,Xiaoyong Zhang,Yen Wei
The highly efficient removal of environmental pollutants from aqueous solution using low cost adsorbents has recently attracted great research attention. Among them, polymer nanocomposites should be some of the most important candidates for adsorption applications because of their combination of the advantages of both nanomaterials and polymers. In this work, a bioinspired strategy has been developed for the fabrication of silica nanoparticle based polymer composites, which were used as low cost and highly efficient adsorbents for the removal of methylene blue. First, poly(SVS-co-ITA) copolymers were synthesized by free radical polymerization using 4-vinylbenzenesulfonate and itaconic anhydride as monomers. Then dopamine was linked with poly(SVS-co-ITA) through a rather facile ring-opening reaction. The final SiO2@poly(SVS-co-ITA–DA) polymer nanocomposites were obtained by attaching poly(SVS-co-ITA–DA) onto silica nanoparticles taking advantage of dopamine adhesion. The structure, morphology and chemical compositions of SiO2@poly(SVS-co-ITA–DA) polymer nanocomposites were characterized by a number of methods in detail. The effect of adsorption parameters, including contact time, concentration of methylene blue, temperature and pH, on adsorption capability have been investigated. The adsorption data was fitted by Langmuir and Freundlich adsorption models. The pseudo-first-order, pseudo-second-order and intra-particle diffusion models were used for kinetic analysis. We found that the adsorption capacity of SiO2@poly(SVS-co-ITA–DA) nanocomposites is much greater than that of raw SiO2 NPs. Taken together, we have developed a bioinspired strategy to prepare silica nanoparticle based polymer nanocomposites with improved performance for environmental applications.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 101
·57463-57475
·
IF 3.708
Tigang Duan,Ye Chen,Qing Wen,Ying Duan
A Ti/Sb–SnO2 electrode modified with titanium nitride (TiN) nanoparticles was prepared by the pulse electro-codeposition method. X-ray diffraction and scanning electron microscopy show that compared with Ti/Sb–SnO2, the Ti/Sb–SnO2–TiN electrode has a small unit cell volume of tetragonal SnO2 and a refined, compact particle film. X-ray photoelectron spectroscopy analysis shows that introducing titanium nitride nanoparticles facilitates the formation of Sb5+. And the adsorbed hydroxyl oxygen species content of Ti/Sb–SnO2–TiN (43.07%) is higher than that of Ti/Sb–SnO2 (21.85%), indicating that the Ti/Sb–SnO2–TiN electrode has more active sites for electrochemical oxidation of organic pollutants. In 0.25 M Na2SO4 solution, the charge transfer resistance of Ti/Sb–SnO2–TiN (150 ohm) is much smaller than that of Ti/Sb–SnO2 (1334 ohm). With a constant current density of 100 mA cm−2, the accelerated service lifetime of Ti/Sb–SnO2–TiN is improved significantly, which is 15.7 times as long as that of Ti/Sb–SnO2. The Ti/Sb–SnO2–TiN electrode is demonstrated to have a prominent ability for oxidative decolorization of methylene blue. The results also confirm that the Ti/Sb–SnO2–TiN electrode has a higher decolorization efficiency and kinetic rate constant, which are 1.54 and 3.24 times as efficient as those of Ti/Sb–SnO2, respectively.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Yecang Tang,Ting Wu,Botao Hu,Qian Yang,Li Liu,Bo Yu,Yi Ding,Shiyong Ye
Ag nanoparticles (AgNPs)-containing hybrid microgels were prepared by in situ reduction of Ag + ions pre-dispersed in copolymer microgels of poly ( N -isopropylacrylamide-co-2-(dimethylamino)ethyl methacrylate) (P(NIPAM-co- DMA)). The prepared hybrid microgels possess excellent thermo- and pH-responsive properties and exhibit a responsive swelling and shrinking behavior. The increase in pH can induce a decrease in the absorption intensity and a blue shift of the surface plasmon band of AgNPs, which is attributed to a reduction in the polarity of AgNPs surroundings as a result of the conformational change of PDMA segments. Furthermore, the hybrid microgel was found to be an active catalyst for the reduction of methylene blue by NaBH 4 in aqueous solution. The effects of temperature and the amount of catalyst on the reduction rate were investigated using UV–vis spectrophotometry . Kinetic studies indicate that the apparent reaction rate constant k app follows the typical Arrhenius-type dependence on temperature in the range of 25 ∼ 40 °C and the activation energy is 62.0 kJ mol −1 . The AgNPs embedded in hybrid microgels show good thermal and chemical stability and the catalytic activity remains unchanged after storage for 40 days at room temperature. Such hybrid microgels, with the merits of good thermal and chemical stability as well as the catalytic activity, have a potential application in the field of heterogenous catalysis.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Hao Zhao,Fengxian Qiu,Jie Yan,Jie Wang,Xin Li,Dongya Yang
A novel economical and environmentally friendly graphene/palygorskite/TiO 2 (GR/Pal/TiO 2 ) composites adsorbent was prepared and characterized by X-ray diffractometry (XRD), Fourier transform infrared (FTIR), N 2 adsorption/desorption isotherms, transmission electron-microscopy (TEM) and scanning electron microscopy (SEM). The GR/Pal/TiO 2 was applied to removal dye methylene blue (MB) and the optimum conditions of adsorption were investigated. The obtained results indicated that when the dosage of GR/Pal/TiO 2 , reaction temperature and time of the composite are 15 mg/mL, 40 °C and 1 h, respectively, the adsorption efficiency can reach 100%. The adsorption kinetic of MB followed the pseudo-second-order model while the adsorption isotherm confirms to the Langmuir model. The adsorption process is spontaneous and endothermic by thermodynamic study. Compared with other different reported materials, the novel GR/Pal/TiO 2 composite exhibits a high adsorption ability for MB removal. The obtained results demonstrate that the prepared GR/Pal/TiO 2 composites are very promising material for the removal of MB from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Pathogens
·
2026
·Vol. 15
·期 10
·1031
·
IF 3.8
Yu Gou,Yuan Chen,Liangjia Bi,Chen He,Shengteng He,Deshu Zhuang
This study evaluated the antimicrobial efficacy of potassium iodide (KI) combined with methylene blue-mediated photodynamic therapy (MB-PDT) against cultured planktonic polymicrobial suspensions derived from clinical subgingival plaque samples. Bacterial suspensions were assigned to untreated control, light-only, KI-only, MB-PDT, and MB + KI-PDT groups. Neither light irradiation alone nor KI alone significantly affected viable bacterial counts compared with the untreated control. Antibacterial activity was assessed using colony-forming unit (CFU) assays and LIVE/DEAD fluorescence staining, and the virulence-related genes kgp , cdtB , and ltxA were evaluated by RT-qPCR. MB-PDT significantly reduced viable bacterial counts, and the addition of 80 mM KI further enhanced the antibacterial effect. The MB + KI-PDT group showed reductions of approximately 1.89 Log10 CFU/mL compared with the untreated control and 0.45 Log10 CFU/mL compared with MB-PDT alone. LIVE/DEAD staining supported the enhanced antibacterial activity of the combined treatment. The relative transcript levels of kgp , cdtB , and ltxA were also lower after MB + KI-PDT. These findings demonstrate that KI enhanced the antimicrobial activity of MB-PDT in a cultured subgingival plaque-derived planktonic polymicrobial suspension model. Further validation in structured multispecies biofilm models is required.
✓ 已验证
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Gang Huang,Danlin Zeng,Mengcheng Wei,Yang Chen,Aoxue Ma,Sirong Cheng
A novel nonmetal-based nanocomposite, protonated g-C 3 N 4 @CaCO 3 (CN-BPCC), was synthesized using a simple calcination method. The construction of this binary composite photocatalyst enhanced the adsorption and photocatalytic degradation performances of pure g-C 3 N 4 . The adsorption and photocatalytic degradation efficiencies under visible-light irradiation were analyzed using methylene blue (MB) as the target organic pollutant. The binary nanocomposite with 1.5 g of CaCO 3 (BPCC) exhibited high adsorption and photocatalytic performance, achieving approximately 100 % degradation of MB under 90 min of xenon lamp irradiation. Furthermore, the nanocomposite displayed enhanced visible-light utilization efficiency and improved separation efficiency of photogenerated carriers. The adsorption and photocatalytic degradation mechanisms were investigated through radical trapping experiments and electron spin resonance (ESR) spectroscopy. Furthermore, the binary CN-BPCC nanocomposite exhibited exceptional reusability after regeneration, indicating its potential as a promising photocatalyst for the treatment of wastewater containing organic pollutants.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·
IF 4.7
Zhang Xutao,Chen Weiliang,Li Xiangqi
Excellent photocatalytic performance and recyclability are crucial for the long-term use of the photocatalyst. In this study, 5 mol% Fe doped zinc oxide (ZF5), was freeze-dried with bacterial cellulose (BC)/sodium alginate (SA) solution to fabricate a novel composite aerogel capable of degrading methylene blue (MB) under visible light. Ca 2+ crosslinking and hydrophobic modifications were adopted to strengthen the aerogel skeleton and enhance the cycling photocatalytic activity, meanwhile, making the aerogel floatable persistently. The influences of pH, ZF5 dosage, and initial solution concentration on MB degradation were investigated. Benefiting from the synergy between the components and the combined modification, the optimum composite aerogel exhibits photocatalytic efficiency of up to 97.4% at an initial MB concentration of 20 mg/L within an irradiation time of 80 min. In addition, it exhibits a degradation efficiency of 79.7% even after 8 cycles, showing great potential in visible-light-driven degradation of MB.
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 5
·1-17
·
IF 3.8
Zhou Zhuyou,Ji Yufeng,Wang Yong,Liu Menghe,Xu Ying,Liu Ruijie,Yang Mingjie,Zou Congyang
In this study, the carbon-doped bimetallic organic framework C 60 /MIL-101(Fe,Cu) catalyst was prepared for the first time via solvothermal synthesis method. The catalysts were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and a series of other instruments. At the same time, methylene blue (MB) was used as the target degradation material to investigate the catalytic performance of H 2 O 2 for MB degradation under visible light. The degradation experiment showed that the removal rate of C 60 /MIL-101(Fe,Cu) to MB reached 99.2% within 80 min. Furthermore, cyclic experiments demonstrated good stability and reusability of the catalyst. Finally, the degradation mechanism of the reaction was deduced by quenching experiment, UV–vis diffuse reflection and mott-Schottky plots. The results show that hydroxyl radical (·OH) and superoxide radical (·O 2 − ) play a major role in the degradation of MB during photo-Fenton process.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）