SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Ze Li,Zhen-Liang Xu,Ben-Qing Huang,Yu-Xuan Li,Ming Wang
Superior anti-fouling property, excellent mechanical strength, high flux and rejection of the membrane are essential for the separation of oil/water emulsions. In this work, a crack-free TiO 2 layer was fabricated on the inner surface of three-channel stainless steel hollow fiber (TCSSHF) membrane, which was coated with nano-TiO 2 particles suspension and polyvinyl alcohol (PVA) solution and then calcined at 500 °C. The prepared nano-TiO 2 modified three-channel stainless steel hollow fiber (TiO 2 -TCSSHF) membrane was systematically characterized by scanning electron microscopy (SEM), pore size distribution, water contact angle and dynamic underwater oil-adhesion measurement. TiO 2 -TCSSHF membrane showed a permeation flux of 760 L m −2 h −1 and a rejection of 99.8% for the separation of 5000 ppm vegetable oil/water emulsion at 0.10 MPa. The membrane also showed the superior fouling resistance and recyclability. Therefore, TiO 2 -TCSSHF membrane provided a promising potential for the practical application of the oil/water emulsion separation.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2019
·Vol. 20
·期 21
·5497
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IF 4.183
Jingpeng Li,Minglei Su,Anke Wang,Zaixing Wu,Yuhe Chen,Daochun Qin,Zehui Jiang
We developed a novel green approach for the in situ fabrication of Ag NPs in mesoporous TiO2films via the bamboo self-sacrificing reduction of Ag(NH3)2+ions, which can inhibit fungal growth on the bamboo surface. Mesoporous anatase TiO2(MT) films were first synthesized on bamboo via a hydrothermal method. Then, Ag NPs with a 5.3 nm mean diameter were incorporated into the pore channels of optimal MT/bamboo (MTB) samples at room temperature without the addition of reducing agents, such that the Ag NPs were almost entirely embedded into the MT films. Our analysis indicated that the solubilized lignin from bamboo, which is rich in oxygen-containing functional groups, serves as a green reductant for reducing the Ag(NH3)2+ions to Ag NPs. Antifungal experiments withTrichoderma virideunder dark conditions highlighted that the antifungal activity of the Ag/MT/bamboo samples were greater than those of naked bamboo, MTB, and Ag/bamboo, suggesting that these hybrid nanomaterials produce a synergistic antifungal effect that is unrelated to photoactivity. The inhibition ofPenicillium citrinumeffectively followed a similar trend. This newly developed bamboo protection method may provide a sustainable, eco-friendly, and efficient method for enhancing the antifungal characteristics of traditional bamboo, having the potential to prolong the service life of bamboo materials, particularly under dark conditions.Keywords:bamboo;Ag/TiO2nanocomposites;self-sacrificing reduction;antifungal activity
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
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IF 7.65
Jiaxing Huang,Daguang Li,Ruobai Li,Ping Chen,Qianxin Zhang,Haijin Liu,Wenying Lv,Guoguang Liu,Yiping Feng
Anatase TiO 2 nanoparticles coated with P and O co-doped g-C 3 N 4 were prepared via a single-step procedure. The resulting POCN/anatase TiO 2 demonstrated remarkable performance in the degradation of enrofloxacin (ENFX). The photocatalytic activity of this heterojunction was 28.9 and 3.71 times better than that of the CN and anatase TiO 2 , respectively. The microtopography of the POCN/anatase TiO 2 was revealed in this study. Co-doping with P and O increased the visible light adsorption capacity of the g-C 3 N 4 , whereas the anatase TiO 2 nanoparticles enhanced the adsorption properties of the ENFX and the separation of the photoinduced carriers of the POCN/anatase TiO 2 . The O 2 ·− and h + were the main reactive oxidative species in the photocatalytic degradation of ENFX. The results of the detection of H 2 O 2 and ESR confirmed that POCN/anatase TiO 2 was a type Z-scheme photocatalyst. Finally, the ENFX degradation pathways were estimated through the detection of by-products.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Chuanzhi Sun,Hao Liu,Wei Chen,Dezhan Chen,Shuohan Yu,Annai Liu,Lin Dong,Shuai Feng
A series of Sm- and/or Zr-doped MnO x -TiO 2 catalysts were prepared, and the catalysts exhibited better N 2 selectivity and SO 2 resistance than the undoped MnO x -TiO 2 catalyst for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR). The reasons for the good N 2 selectivity and SO 2 resistance of the catalysts were proposed. X-ray photoelectron spectroscopy (XPS) combined with density functional theory (DFT) calculations suggested that electron transfer between the manganese and samarium species by Mn 4+ + Sm 2+ ↔ Mn 3+ + Sm 3+ redox cycles occurred in the Sm-containing catalysts. Furthermore, electron transfer from Sm 2+ to Mn 4+ suppressed electron transfer from NH 3 to Mn 4+ , inhibiting the formation of NH 2 or NH. Thus, the pathway for NH generation was removed, and the reaction of 2NH + 4NO → 3N 2 O + H 2 O was prevented. Consequently, the N 2 selectivity of the NH 3 -SCR reaction was enhanced. In situ diffused reflectance infrared Fourier transform spectroscopy ( in situ DRIFTS) combined with thermogravimetry, differential scanning calorimetry and mass spectrometry (TG-DSC-MS) results revealed that the deposition rate of sulfate species decreases after Sm doping, which was also attributed to the suppressed electron transfer from SO 2 to Mn 4+ , i.e., the oxidation of SO 2 to SO 3 . Thus, the catalysts exhibited better SO 2 resistance.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon,Yizhen Zhang,Ahmed Mahmoud Idris
A visible-light Z-scheme g-C 3 N 4 /Fe 0 /TiO 2 anodic catalyst was tested with cathodic WO 3 in photocatalytic Fuel Cell (PFC) that efficiently degrades berberine chloride and simultaneously generate electricity at pH 2,5,7 and 13. The Stainless-steel mesh electrodes loaded with prepared catalyst were irradiated by visible-light in single chamber PFC. The highest removal of berberine Chloride, cell voltage, and power density were 91%, 0.8 V, and 16.4 W/m 2 at a current density of 2.02 mA/cm 2 , respectively after 90 min irradiation in 0.05 M Na 2 SO 4 electrolyte, with 10 Ω external resistance. The impacts of pH and initial concentration of BEC on photocatalytic degradation and cell voltage were evaluated. The cell current density is enhanced while the photocatalyst activity increased. The constructed PFC maintained high-performance after 5 uses. Its use in degrading wide spectrum refractory pollutants and generate electricity is expected for the proved catalyst design, paired electrodes and high PFC performance for practical wastewater treatment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 19
·19122-19133
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IF 2.8
Ren Bin,Wang Tiecheng,Qu Guangzhou,Deng Fang,Liang Dongli,Yang Wenli,Liu Meishan
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO 2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated. Results showed that the photocatalytic rate of the prepared g-C 3 N 4 /TiO 2 photocatalyst to degrade AO7 was about three times than that of pristine TiO 2 and g-C 3 N 4 . The g-C 3 N 4 /TiO 2 composite with a ratio of 1:4 had the highest degradation efficiency for AO7 solution. Its degradation efficiency under acidic conditions was significantly higher than that under alkaline conditions. The enhancement of photocatalytic activity can be attributed to the formation of heterojunctions between g-C 3 N 4 and TiO 2 , which leads to rapid charge transfer and the efficient separation of photogenerated electron-hole pairs. The recycling experiment indicated that the photocatalyst of g-C 3 N 4 /TiO 2 nanocomposites still maintained good photochemical stability and recyclability after five cycles; this finding was important for its practical applications. A series of free radical trapping experiments showed that •O 2 − played a crucial role in the degradation of AO7.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yilin Wu,Chunxiang Li,Minjia Meng,Peng Lv,Xinlin Liu,Yongsheng Yan
Herein, the GO/TiO 2 -based molecularly imprinted nanocomposite membranes (GT-MIMs) with high selectivity and constitutionally structural stability were developed by by the incorporation of polydopamine (pDA) membrane modification technique and the simple vacuum filtering method. Instead of constructing imprinted polymers onto pristine membrane surfaces, a versatile filtering strategy was conducted on the membrane surfaces by using GO and TiO 2 as the nanocomposite structures. And the GT-MIMs were finally obtained after a two-step-temperature imprinting process by using propranolol as the template molecules. Moreover, attributing to the formation of this membrane-based multilevel nanocomposite surfaces, largely enhanced propranolol-rebinding capacities (53.44 mg/g), permselectivity (separation factors were all more than 16.5) and structural stability (still maintained 92% of the maximum adsorption capacity after 11 cycling operations) were easily achieved. These results strongly illustrated that this GO/TiO 2 -based imprinting membrane materials would achieve both the high rebinding capacity and the excellent permselectivity. All the synthesis processes were carried out at low temperature and ordinary pressure, which were energy-efficient and environmentally friendly for large-scale application.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 24
·9345-9353
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IF 3.069
Yuheng Zhang,Qi Li,Qing Gao,Jiawei Li,Yongxuan Shen,Xiashi Zhu
In this paper, the ionic liquid (IL), 1-octyl-3-methylimidazolium hexafluorophosphate ([Omim][PF6]), was employed to synthesize β-cyclodextrin (β-CD)-functionalized carbon nanotubes/TiO2 (IL–CD-CNTs/TiO2) nanocomposite via a one-pot solvothermal process. The as-prepared product was characterized by SEM, TEM, XRD, TG, FT-IR, EIS, and so forth. Coupled with an aspirated in-syringe device, IL–CD-CNTs/TiO2 could yield the rapid removal of water contaminants within 8 min. In addition to the excellent adsorption capacity, this dual-functional photocatalyst also showed enhanced photocatalytic activity under visible light at a degradation rate of 97% within 180 min. The photocatalytic mechanism based on the formation of the inclusion complex, density functional theory, and electronic structure of IL–CD-CNTs/TiO2 was comprehensively discussed. The IL not only served as the reaction medium but also played a crucial role in improving the adsorption capacity and photocatalytic activity. By exhibiting a strong electron-donating character, IL could promote efficient charge transfer, inhibiting the recombination of photogenerated electron–hole pairs. The as-prepared photocatalyst—capable of rapid adsorption and photodegradation—can meet the requirements of practical applications and reveals a promising direction toward wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Tao Yang,Houfeng Xiong,Fen Liu,Qiyong Yang,Bingjie Xu,Changchao Zhan
In the application of ultrafiltration (UF) for removal of natural organic matter (NOM) from water, membrane fouling has always been considered a big issue. The influence of UV/TiO 2 photocatalysis as pretreatment to mitigate cross-flow ceramic UF membrane fouling caused by humic acid (HA) and the involved mechanisms of fouling development were investigated. The characterization of dissolved organic carbon (DOC), specific ultraviolet absorbance (SUVA), excitation-emission matrix (EEM), molecular weight (MW), hydrophilicity, fouling resistance, scanning electron microscopy (SEM) and model fitting using Hermia blocking models were performed. The dominant membrane fouling patterns can be predicated by the initial intermediate pore blocking, transition fouling and the final stage of limited cake growth. With extended UV/TiO 2 pretreatment time, a significant reduction of cake filtration coefficients and a slight decrease in pore blocking coefficients were observed. Longer UV/TiO 2 pretreatment achieved the remarkable effect of reversible fouling elimination as a result of reaching the final stage of limited cake growth earlier and aggregation forming a porous cake layer by TiO 2 particles mixed with more hydrophilic (HPI) and high MW (>50 kDa) humic-like substances. However, photocatalytic pretreatment exhibited a slight effect on the mitigation of irreversible fouling that was mainly dominated by HPI fractions, especially tryptophan-like protein (5–50 kDa) organics attaching to and/or blocking the membrane pores.
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TALANTA
·
2018
·
IF 4.244
Dandan Jiang,Xiqian Li,Xueju Lv,Qiong Jia
Dendrimers exhibit tunable terminal functionality and bio-friendly nature, making them of being promising materials for applications in the field of separation and enrichment. In this work, we prepared magnetic hydrazide-functionalized poly-amidoamine (PAMAM) dendrimer embedded with TiO 2 for the enrichment of phosphopeptides. The novel affinity probe possessed superparamagnetism , realizing its rapid separation from sample solution. Electrostatic attraction and hydrogen bonding existed between PAMAM and phosphopeptides while Lewis acid-base interaction was originated between TiO 2 and the targets. The combined synergistic strength of multiple binding interactions contributed to the highly selective enrichment of phosphopeptides. The specificity for the capture of phosphopeptides was reflected in quantities as low as 1:1000 mass ratio of phosphopeptides to non-phosphopeptides. The detection limit of β -casein digests was low to 0.4 fmol, indicating the high sensitivity of the developed method. Fifteen and four phosphopeptides could be selectively captured from non-fat milk digests and human serum samples, which further confirmed the great potential of the affinity probe in the extraction of low-abundance phosphopeptides from real complex biological samples.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2015
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IF 2.729
Airong Mao,Hongbo Li,Zhaosheng Cai,Xiaoya Hu
A glassy carbon electrode modified with nano TiO 2 and multi-walled carbon nanotubes composites dispersed in a novel cationic surfactant was described for the determination of trace mercury(II) by linear anodic stripping voltammetry. Under optimal experimental conditions, the linear sweep anodic stripping peak current was linear with the concentration of Hg(II) in the range of 0.1–100 μmol L −1 with a detection limit of 0.025 μmol L −1 . The sensitivity was found to be 3.7014 A/mol L −1 . The proposed electrode also showed a high selectivity for mercury in the presence of common potential interfering metal ions. Moreover, the proposed electrode revealed good reproducibility and stability. The proposed method was successfully applied for the determination of Hg(II) in river water and industrial wastewater samples.
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ELECTROCHIMICA ACTA
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2013
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IF 3.777
Xingtian Yin,Wenxiu Que,Duan Fei,Haixia Xie,Zuoli He
TiO 2 shell layer on the surface of ZnO nanowires (NWs) was synthesized by a layer by layer adsorption and reaction (LBLAR) method. Scanning electron microscopy image shows that the prepared ZnO–TiO 2 core–shell NW arrays have a similar morphology with the well-aligned ZnO core NW arrays, providing the LBLAR cycles is controlled within a certain number. The prepared ZnO–TiO 2 core–shell NW arrays were sensitized with CdS quantum dots to assemble quantum dots sensitized solar cells. Results indicate that a dramatic increase in open-circuit voltage and fill factor is achieved with an introduction of the TiO 2 shell layer with a thickness of about 7 nm, resulting in a substantial improvement of the overall energy conversion efficiency. A rapid electron transfer from the CdS QDs to the ZnO NWs and a reduced electron recombination rate due to the energy barrier occurred at the interface between the ZnO core and the TiO 2 shell are believed to contribute to the improved performance of the solar cells based on the ZnO–TiO 2 core–shell NW arrays. In addition, effects of the TiO 2 shell thickness on the performance of the as-fabricated devices are also discussed in detail.
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