MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Muhammad Khalid Hussain,N.R. Khalid,M.B. Tahir,Muhammad Tanveer,Tahir Iqbal,Maira Liaqat
A novel ternary ZnO/CuO/MoO 3 (ZnO/CuO/M) heterojunction photocatalysts with the nanorods morphology was synthesized by facile hydrothermal treatment . The surface morphology as nanorods, optical properties , photogenerated separation/transfer of charge carriers and photocatalytic properties were characterized for all developed photocatalysts. The photodegradation of organic pollutants including rhodamine B (RhB) and alizarin yellow (AY) dyes was studied under the visible light irradiance. The ternary ZnO/CuO/M nanorods revealed improved photocatalytic performance than pristine ZnO, CuO, MoO 3 and binary CuO/M composite. Amongst all ternary ZnO/CuO/M photocatalysts displayed the best photocatalytic activity for RhB (97%) and AY (79%) dyes within 120 min, which is 57 times and 64 times higher than that of pristine MoO 3 . Reactive trapping experiments were also executed qualitatively to perceive the characters of different active species for both dyes degradation. The improved photocatalytic presentation could be credited to the development of the ZnO/CuO/M heterojunction photocatalysts, which is advantageous for efficient fast transfer and separation of the photoexcited charge carriers.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4277-4287
·
IF 3.3
Jiaxin Mou,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jun Li,Chunzi Xu,Hui Wang,Hongyu Shen
To expand the optical absorption range and charge transfer efficiency of photoanode, the ZnIn2S4/PANI/TiO2/Ti photoanode was developed using a coating method and applied in a photocatalytic fuel cell (PFC) system for the removal of organic pollutants and chemical energy recovery. The prepared photoanode obtained a maximum photocurrent density of 4.19 mA cm−2 (1.2 V vs. SCE). The rhodamine B (RhB) removal efficiency, maximum power density (Pmax) and short-circuit current density (Jsc) of PFC constructed with the ZnIn2S4/PANI/TiO2/Ti composite photoanode and Cu cathode were 93.80% (1 h), 18.83 μW cm−2 and 0.26 mA cm−2, respectively. The improved photocatalytic activity of PFC was due to the outstanding photoelectric properties of the ZnIn2S4/PANI hybrid material, in which PANI, as a photosensitizer, promoted the absorption of visible light by the photoanode. The photoexcited electrons of ZnIn2S4 and PANI tend to be directly transferred to the CB of TiO2, while holes accumulate in the VB of PANI to participate in the oxidation reaction. The synergistic effect accelerates the separation of photogenerated electron–hole pairs and improves the photoelectric conversion efficiency of PFC.
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ChemistrySelect
·
2023
·Vol. 8
·期 32
·e202300507
·
IF 2.1
Yang Xu,Yingying Zhu,Yifan Zhou,Jinyuan Zhu,Chaoran Li,Geng Chen
Graphical A thin-film nanocomposite forward osmosis membrane containing APTMS-modified SiO 2 nanoparticles was prepared and evaluated herein. The modification of APTMS effectively improved the uniformly dispersion of SiO 2 due to the transitions from the original hydrophilic surface to the lipophilic. The key finding is that the APTMS-SiO 2 TFN membrane exhibited remarkble enhancements in water fluxes and improvements in CR and RhB dye rejections. Fumed silica (SiO 2 ) is often applied in the modification of thin-film composite (TFC) forward osmosis (FO) membranes due to its hydrophilicity. However, a key challenge to be solved is to improve its compatibility with organic matrices and dispersion in the material. In this study, we synthesized well-designed nanoparticles of (3-aminopropyl)trimethoxysilane-modified SiO 2 (APTMS-SiO 2 ) and applied them for the first time in the preparation of FO membranes. Furthermore, we systematically investigated the effects of different pretreated SiO 2 , SiO 2 dosages, draw solution types, and concentrations on FO membranes. The results showed that APTMS-SiO 2 thin-film nanocomposite with a silica dosage of 0.1 wt.% has the highest water permeate flux (J w ) (26.25 LMH, 370.43 % higher than the control TFC of 5.58 LMH) and the minimum specific reverse solute flux (SRSF) of 0.17 g/L with 1 M NaCl as the draw. The incorporation of APTMS effectively prevented mutual agglomeration of SiO 2 and improved its dispersion. The J w of 13.36 LMH after seven cycles and the rejection of above 96.6 % for Congo Red and 95.8 % for Rhodamine B indicated potential reusability and dye rejection. This work presents an alternative approach to prepare FO membranes with enhanced water flux and increased selectivity, and it also offers insights for the treatment of printing and dyeing wastewater using FO.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 41
·15797-15805
·
IF 4.569
Jiawei Wu,Bangfu Ding,Xin Qian,Liang Mao,Huibin Zheng,Lei Zhang,Shukai Zheng,Junying Zhang
The Bi2MoO6 nanosheets are loaded on to γ-Bi2O3 tetrahedron surfaces to form Bi2MoO6/γ-Bi2O3 heterojunctions using a simple calcination method. The photocatalytic degradation efficiencies of the lomefloxacin and the Rhodamine B using the optimum sample are 96% and 99%, respectively, much higher than that of pure phase samples. When the waters from different regions in China were used as solvents, the removal efficiencies of the lomefloxacin and the Rhodamine B are still higher than 88% and 90%, respectively, which shows excellent prospects for practical applications. The photocatalytic degradation efficiencies of these two pollutants are higher than 91% and 95% in the five cycling tests, and the crystal structure of the sample is not changed after cycling. Based on the first-principles calculation, Bi2MoO6 and γ-Bi2O3 form a Z-type energy band structure which accelerates the separation of the photogenerated charge carriers. The Bi2MoO6 valence band potential of 3.25 V and the γ-Bi2O3 conduction band potential of −0.21 V are reserved to generate ˙OH− and O2−, respectively, for the photocatalytic reaction. The degradation of the lomefloxacin is ascribed to the shedding of functional groups and bond breaking with the final products being CO2, F−, H2O, and NO3−. This research shows that Bi2MoO6/γ-Bi2O3 heterojunctions can be employed to purify domestic and textile industrial sewage.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuehao Shen,Yuxin Xiao,Hongjie Zhang,Hongjie Fan,Yao Li,Zhongli Yan,Wen-Hui Zhang
Treating the wastes generated from pulp and paper mills, such as black liquor and Fenton sludge is challenging. In this study, the biochar-supported Fe-Cu bimetallic catalysts were synthesized by a one-step pyrolysis method using Fenton sludge as iron source, acid-precipitated black liquor (APBL) as carbon source and copper nitrate as copper source. The catalysts were used to remove rhodamine B (RhB) dye from aqueous solution by Fenton-like reaction. The optimal catalyst (FeCu@BC 600-2 ) was pyrolyzed at 600 °C with an Fe/Cu mixing ratio of 2 and consisted of mesoporous biochar supported nanoscale Fe 3 O 4 and Cu 0 . It had a specific surface area of 104.6 m 2 ·g −1 and a saturation magnetization of 33.3 emu·g −1 . In the FeCu@BC 600-2 /H 2 O 2 system, RhB dye (10 mg·L -1 ) was completely removed within 60 min at acidic pH (initial pH 3, 0.2 g·L -1 catalyst, 1 mM H 2 O 2 ) or 6 h at neutral pH (initial pH 7, 0.25 g·L -1 catalyst, 25 mM H 2 O 2 ) at 30 °C. Moreover, the FeCu@BC 600-2 exhibited good magnetic separation ability, low metal leaching, excellent reusability and broad applicability to other synthetic dyes. The dye removal mechanism involved the synergistic effect of adsorption and catalytic oxidation (especially heterogeneous catalytic oxidation). At acidic pH, RhB degradation was due to •OH radical, which was generated from the activation of H 2 O 2 by ≡Cu(I) or Cu(I) oxidized from Cu 0 and ≡Fe(II) in Fe 3 O 4 . At neutral pH, RhB degradation was mainly due to •OH and 1 O 2 with the former being produced by ≡Cu(I) and ≡Fe(II). Furthermore, Cu(I) oxidized from Cu 0 and the active functional groups (such as sp 2 C = C) in the biochar facilitated the reduction of Fe(III) to Fe(II), resulting in a high catalytic oxidation efficiency.
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Catalysts
·
2019
·Vol. 10
·期 1
·6
·
IF 3.444
Jia Huang,Gang Nie,Yaobin Ding
To develop highly efficient heterogeneous photocatalysts for the activation of dissolved oxygen is very interesting in the field of green degradation of organic pollutants. In the paper, oxygen atom doped g-C3N4(O-g-C3N4) was prepared via a facile chemical oxidation of g-C3N4by peroxymonosulfate. X-ray photoelectron spectroscopy analysis suggests the oxidative treatment of g-C3N4by peroxymonosulfate evidently increased atomic percentage of oxygen on O-g-C3N4surface to 6.9% as compared with 1.8% for g-C3N4. Meanwhile, the doped oxygen atom mainly existed as carbonyl and carboxyl groups. Optical characterization indicates the introduction of oxygen improved the response of O-g-C3N4to visible light, and more obviously, separation of photo-generated h+-e−. 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) probe measurement indicates the formation of O2•−was dramatically enhanced through activation of dioxygen by photo-generated electrons in the O-g-C3N4photocatalytic system. Through high performance liquid chromatography (HPLC) and Liquid chromatography–mass spectrometry (LC-MS) analysis, it was found rhodamine B (RhB) photocatalytic degradation by O-g-C3N4followed step by step N-deethylation reaction pathways induced by the formed O2•−, rather than the non-selective decomposition of the chromophore in RhB by other radicals, such as hydroxyl radicals. This study provides a facile method to develop oxygen atom doped g-C3N4photocatalyst, and also clarifies its photocatalytic activation mechanism of molecular oxygen for N-deethylation reaction of RhB.Keywords:photocatalysis;oxygen doped g-C3N4;activation of dioxygen;superoxide radicals;selective N-deethylation of rhodamine B
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Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Noor Ahmed Nahyoon,Lifen Liu,Kané Rabé,Sarwan Ahmed Nahyoon,Azmat Hussain Abro,Fenglin Yang
In this study, a novel heterojunction silver phosphate-iron-graphene oxide -titanium phosphate (Ag 3 PO 4 /Fe/GTiP) composite was fabricated by the simple chemical process. The prepared composite was characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-vis), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and electrochemical impedance spectroscopy (EIS). This catalyst was used as anode material in photocatalytic fuel cell (PFC) with cathode catalyst ZnIn 2 S 4 for efficient degradation of rhodamine B (RhB) with sustainable electricity generation. In PFC the degradation of 90% RhB (10 mg/l) with electricity generation of 0.18 V during 70 min was achieved at pH-3 of 0.05 M Na 2 SO 4 electrolyte. By increasing the RhB concentration up to 100 mg/l the electricity generation was increased up to 0.55 V. Under pure photocatalysis degraded 92.14% RhB (10 mg/l) with Ag 3 PO 4 /Fe/GTiP in 90 min. The discoloration efficiency and electricity generation are influenced by factors such as pH, external resistance, dye concentration, and aeration rate in the PFC. After four cycles of reuse, there was no decrease in PFC performance, which proves its positivity for sustainable energy generation as a greener technology.
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RSC Advances
·
2015
·Vol. 5
·期 130
·107964-107969
·
IF 3.84
Xiaolei Zhang,Jingjing Deng,Guoyue Shi,Tianshu Zhou
In this work, we for the first time developed a visual and fluorescent dual probe for hypochlorite (ClO−) based on stimuli-responsive valence-tautomeric infinite coordination polymer (ICP) nanoparticles encapsulated with a fluorescent dye, i.e., rhodamine B (RhB). In the absence of ClO−, the as-formed RhB@{Co(3,5-dbsq)(3,5-dbcat)(bix)} ICP nanoparticles are well dispersed and quite stable in aqueous solution. However, the addition of ClO− into the dispersion of RhB@{Co(3,5-dbsq)(3,5-dbcat)(bix)} destroys the {Co(3,5-dbsq)(3,5-dbcat)(bix)} network structure, resulting in the release of RhB from ICP nanoparticles into the solvent. As a consequence, the color of the dispersion changed from purple to orange-red and, in the meantime, the fluorescence of RhB turns on, which constitutes a new mechanism for colorimetric and fluorescence dual-model sensing of ClO−. With the method demonstrated here, the ClO− in tap water can be easily visualized by the naked eye and detected quantitatively through double channels. This study not only offers a new method for on-the-spot visible detection of ClO− in environmental samples, but also provides a strategy for designing dual mode sensing mechanisms based on the stimulus response of valence-tautomeric ICP nanomaterials.
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ANALYST
·
2015
·Vol. 140
·期 5
·1731-1738
·
IF 4.107
Di Chen,Yun-Qing Huang,Xiao-Mei He,Zhi-Guo Shi,Yu-Qi Feng
A rapid analysis method by coupling carbon nanotube film (CNTF) microextraction with desorption corona beam ionization (DCBI) was developed for the determination of Sudan dyes (I–IV) and Rhodamine B in chilli oil samples. Typically, CNTF was immersed into the diluted solution of chilli oil for extraction, which was then placed directly under the visible plasma beam tip of the DCBI source for desorption and ionization. Under optimized conditions, five dyes were simultaneously determined using this method. Results showed that the analytes were enriched by the CNTF through the π–π interactions, and the proposed method could significantly improve the sensitivities of these compounds, compared to the direct analysis by DCBI-MS/MS. The method with a linear range of 0.08–12.8 μg g−1 and good linear relationships (R2 > 0.93) in a multiple reaction monitoring (MRM) mode was developed. Satisfactory reproducibility was achieved. Relative standard deviations (RSDs) were less than 20.0%. The recoveries ranged from 80.0 to 110.0%, and the limits of detection (LODs) were in the range of 1.4–21 ng g−1. Finally, the feasibility of the method was further exhibited by the determination of five illegal dyes in chilli powder. These results demonstrate that the proposed method consumes less time and solvent than conventional HPLC-based methods and avoids the contamination of chromatographic column and ion source from non-volatile oil. With the help of a 72-well shaker, multiple samples could be treated simultaneously, which ensures high throughput for the entire pretreatment process. In conclusion, it provides a rapid and high-throughput approach for the determination of such illicit additions in chilli products.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 27
·期 1
·90-97
·
IF 1.757
Tong-Mou Geng,Chang Guo,Yan-Jie Dong,Meng Chen,Yu Wang
A hydrophobic organic monomer GRBE with a polymerizable methacrylester moiety had been synthesized by reaction of rhodamine B-ethanediamine with glycidyl methacrylate. A water-soluble polymeric chemosensor poly(VP-GRBE) had been prepared via copolymerization with a hydrophilic comonomer (vinylpyrrolidone) and GRBE, which was able to sense environmentally poisonous cations in completely aqueous media. The chemosensor was a derivative of rhodamine B, which behaved as a fluorescent and chromogenic sensor toward various heavy cations, particularly Cr 3+ , Fe 3+ , and Hg 2+ . Titration curves of Cr 3+ , Fe 3+ , and Hg 2+ were constructed using rapid, cheap, and widely available technique of fluorescence spectroscopies. The detection limits for Cr 3+ , Fe 3+ , or Hg 2+ ions were found to be 2.20 × 10 −12 , 2.39 × 10 −12 , and 1.11 × 10 −12 mol/l in the same medium, respectively. Moreover, a colorimetric response from the polymeric chemosensor permitted the detection of Cr 3+ , Hg 2+ , or Fe 3+ by “naked eye” because of the development of a pink or brown yellow color when Cr 3+ , Hg 2+ , or Fe 3+ cations interacted with the copolymer in aqueous media. Copyright © 2015 John Wiley & Sons, Ltd.
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Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Fang Wang,Yong Tao Zhang,Yanli Xu,Xing Wang,Sunfeng Li,Hanbiao Yang,Xueting Liu,Fengyu Wei
N-K 2 Ti 4 O 9 /g-C 3 N 4 /UiO-66 ternary composites were successfully synthesized by a solvothermal method, and were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, the valence band X-ray photoelectron spectroscopy, field emission transmission electron microscopy , photoluminescence emission spectra and N 2 adsorption-desorption. Photocatalytic activities of N-K 2 Ti 4 O 9 , g-C 3 N 4 , UiO-66, N-K 2 Ti 4 O 9 /g-C 3 N 4 binary composites and the ternary composites were investigated by the degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the ternary composites exhibit higher photocatalytic activity as compared with the binary composites and the pure materials. The synergistically enhanced photocatalytic activity of the ternary composites is due to coupling direct solid-state Z-scheme N-K 2 Ti 4 O 9 /g-C 3 N 4 heterojunction with high adsorption capacity of UiO-66 for RhB.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Kangkang Wang,Yuli Kou,Changyan Guo,Kefu Wang,Jiang Li,Julia Schmidt,Meng Wang,Siqi Liang,Wei Wang,Yi Lu,Jide Wang
The accumulation of microplastics (MPs) in the environment and their role as carriers for ionic organic pollutants are increasingly attracting attention. This study evaluated the adsorption-desorption characteristics of the cationic organic pollutant on virgin and UV-aged non-degradable polystyrene (PS) as well as degradable poly(butylene succinate) (PBS) and poly(butylene adipate-co-terephthalate) (PBAT) MPs. The results showed that aging treatment made the surface of MPs rougher and more porous, causing the adsorption to shift from monolayer to multilayer adsorption. Aging increased the oxygen-containing groups on MPs, significantly enhancing the H bond (HB) donor capabilities of degradable aged PBS and PBAT, thereby improving adsorption by more than 10 times. This significant increase in adsorption is mainly due to the combined effects of strong HB (including ordinary HB (OHB) and charge-assisted HB (CAHB)), electrostatic interactions, and π-π interactions. Notably, the stronger HB enabled aged PBS and PBAT to achieve efficient and stable adsorption of rhodamine B over a wide pH range, with significant desorption hysteresis (HI > 1.80). This indicates that degradable aged MPs can act as carriers for long-distance pollutant transport. The significant total desorption of cationic pollutants from aged PBS and PBAT in simulated animal gastrointestinal fluids confirmed the greater environmental hazards of degradable aged MPs. This work is the first to demonstrate that degradable aged MPs, as unique HB donors, can primarily adsorb ionic organic pollutants through strong HB (CAHB and OHB), which helps assess the environmental fate of biodegradable microplastics and pollutants in aquatic systems.
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