COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shiyu Zhang,Qiuyu Qiao,Yangfeng Wen,Kena Ren,Xiaoyu Ma,Haisheng Tao
A novel composite of acetic acid-modulated AC-NH 2 -MIL-101(Fe) was prepared by mild chemistry . The catalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), Brunaure-Emmett-Teller (BET) and X-ray photoelectron spectroscopy (XPS). Acetic acid can control the crystal size, so that the catalyst had a large specific surface area (99.35 m 2 ·g −1 ) and pore size (0.13 cm 3 ·g −1 ), the adsorption amount of Rhodamine B (RhB) up to 446.965 mg·g −1 , after the addition of peroxydisulfate (PDS), the catalytic degradation efficiency of RhB was as high as 99.7%. Electronic paramagnetic resonance spectrometer (EPR) and quenching experiments showed that the catalytic process may involve radical (·OH, SO 4 -· and O 2 ·- ) and non-radical ( 1 O 2 ) processes, in which the contribution of 1 O 2 to degradation reached 63.55% and played a major role.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yunlong Li,Miao Liu,Yixian Liu,Lilong Zhou,Jilong Han,Zhengjie Li,Jimmy Yun,Runjing Liu
Two kinds of Ce-doped UiO-66 were synthesized by using CeCl 3 ·7H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 as cerium precursors, namely Ce(III)- and Ce(IV)-UiO-66. The effect of valence states of cerium precursors on adsorption performance towards Rhodamine B (RhB) was investigated for the first time. Ce atoms are in two valence states of +3 and + 4, where Ce 3+ ions turn their surfaces negatively charged. The higher cerium content (24.8%) and ratio of Ce 3+ /Ce 4+ ions (1.4:1) of Ce(IV)-UiO-66 made its surface more negatively charged, which is contributed to form stronger electrostatic interaction with cationic dyes. The adsorption amounts of RhB were 239.5 mg/g and 431.7 mg/g for Ce(III)- and Ce(IV)-UiO-66, which are 2.38 and 5.11 times higher than pristine UiO-66, respectively. The well-fit Langmuir model and pseudo-second-order model suggest a monolayer chemisorption process. The adsorption mechanism suggests that the electrostatic interaction and the complexation interaction between Ce 3+ and RhB are dominant factors affecting RhB adsorption. Since Ce 3+ severed as adsorption sites, the higher Ce content and stronger electrostatic interaction of Ce(IV)-UiO-66 together promoted its RhB adsorption than Ce(III)-UiO-66. The obtained results help to understand how the mixed-valences of incorporated metals affect the adsorption behaviors of bimetallic MOFs deeply.
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MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Huizi Zheng,Haoming Sun,Zhipeng Zhang,Yudan Qian,Xiaolin Zhu,Jiao Qu
Microplastics have worldwide accumulated in water and coexisted with different toxic chemicals, which ultimately threaten human health. However, the combined cytotoxicity of microplastics and typical pollutants is still limited. Therefore, it is essential to evaluate the individual toxicity of microplastics and the combined toxicity with other contaminants rapidly and accurately. In this study, a sensitive electrochemical cell-based sensor based on a carbon nanohorn/rhodamine B modified electrode was proposed. Normal human liver (L-02) cells were used as the ideal model for toxicity evaluation. The sensor was used to detect the cytotoxicity of polystyrene microplastic (PS), bisphenol A (BPA), pentachlorophenol (PCP), and lead (Pb 2+ ). The half inhibition concentration (IC 50 ) values of PS, BPA, PCP, and Pb 2+ to L-02 cells were 286.34 μg/mL, 78.85 μM, 67.87 μM, and 60.12 μM, respectively. The combined toxicity of PS and typical pollutants (BPA, PCP, Pb 2+ ) revealed an additive effect. Moreover, the mechanism underlying the cytotoxicity of microplastics and three pollutants was investigated from the perspective of oxidative stress and cellular apoptosis. The toxic effects inhibited cell division and growth, with apparent oxidative stress damage and increased apoptosis. This study provideds a sensitive tool for toxicity detection of microplastics and typical pollutants, and reveals the possible mechanisms involved.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 26
·期 2
·1445-1454
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IF 2.8
Wang Daiyao,Zou Jing,Cai Huahua,Huang Yixin,Li Fei,Cheng Qingfeng
Advanced oxidation processes offer effective solutions in treating wastewater from various industries. The process of alkali-activated hydrogen peroxide (H 2 O 2 ) was superior for the treatment of alkaline dye wastewater because no additional reagents were required except H 2 O 2 . However, an important and interesting phenomenon had been observed that the primary reactive species were found different for degrading organic pollutants with the process of alkali-activated H 2 O 2 . Azo dye of Orange G (OG) and triphenylmethane dye of Rhodamine B (RhB) were chosen as the target organic pollutants. The influences of various parameters on OG and RhB degradation by alkali-activated H 2 O 2 were evaluated. Furthermore, different scavengers, including ascorbic acid, methanol, t -butanol, isopropyl alcohol, furfuryl alcohol, and nitro blue tetrazolium, have been tested to identify the active species involved in dye degradation, and it was found that O 2 ·− was mainly responsible for degrading OG, while HO 2 − anion was the primary oxidant for degrading RhB.
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PubMed
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ACS Omega
·
2018
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IF 0
Shengli Wang,Yanping Jia,Lianfa Song,Haifeng Zhang
Hydroxylamine (HA) can react with hydrogen peroxide (H2O2) to generate hydroxyl radical (HO•), but the reaction rate between them is very slow (2.2 × 10–4 M–1 s–1). We propose a new system to accelerate the formation of aminoxyl radical (NH2O•) by the addition of cerium [Ce(IV)] to induce the continuous production of HO• through reaction with H2O2. We also investigate the decolorization and mineralization of rhodamine B (RhB) and mechanism in the Ce(IV)/H2O2/HA system. The initial pH plays a significant role in decolorization of RhB. In this work, observation of the rapid decolorization process after 60 min revealed that approximately 80% of RhB was degraded at the initial pH of 4.0. The HO• radicals were considered as the primary reactive oxidant in the system, during its investigation through coumarin capturing, benzoic acid capturing, and radical quenching experiments. The results of the present study suggest that the addition of Ce(IV) can greatly enhance the production of HO•, and the rapid decolorization and mineralization of RhB can occur through the Ce(IV)/H2O2/HA system at acidic pH conditions.
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PubMed
Micro & Nano Letters
·
2019
·Vol. 14
·期 5
·501-504
·
IF 0.975
Ya Liu,Yuqing Miao
The quadrangular (QA) bismuth oxychloride nanoflakes (NFs) were synthesised by a simple solvothermal reaction. They were characterised by scanning electron microscope, transmission electron microscope and X-ray diffractometer. As catalysts, the square NFs exhibited excellent catalytic performance in the reduction of 4-nitrophenol (4-NP) and the degradation of rhodamine B (RhB). The complete reduction of 4-NP to 4-aminophenol was obtained in 30 s and the nearly complete degradation of RhB in 20 min.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Yuwei Pan,Minghua Zhou,Ying Zhang,Jingju Cai,Bing Li,Xuejie Sheng
An efficient heterogeneous catalyst, pre-magnetized Fe 0 (pre-Fe 0 ) could significantly activate persulfate (PS) to remove Rhodamine B (RhB). The effect of pH, Fe 0 and PS dose on the RhB removal in the pre-Fe 0 /PS and Fe 0 /PS processes were investigated, and optimized by response surface methodology (RSM) to analyze the rate constants of the RhB removal in the pre-Fe 0 /PS process and Fe 0 /PS process ( f ). High RhB removal was obtained at low pH and high dose of Fe 0 and PS in both systems. Low Fe 0 and high PS dose and large pH would result in big value of f , and the simulated maximum f of 44.3 was achieved at 2 mM Fe 0 , 16 mM PS and pH 9. The synergetic factor of pre-Fe 0 /PS (45.6) was larger than that of Fe 0 /PS (21.4). The pre-Fe 0 /PS process presented 2.1–37.5 folds enhancement than the Fe 0 /PS process for the degradation of RhB. The RhB removal in the pre-Fe 0 /PS process was 1.5–11.2 folds enhancement than that of the Fe 0 /PS process in the presence of different anions and cations. Scanning Electron Microscope (SEM) results and the larger intensity of DMPO-SO 4 − adduct signal in the Electron Paramagnetic Resonance (EPR) confirmed the primary role of sulfate radicals generated from the reaction of PS with Fe 0 in the contaminant degradation. The pre-Fe 0 /PS process exhibited advantages over other processes to remove RhB in terms of contaminant removal, working pH range and chemical dose. Therefore, the pre-Fe 0 /PS process is a cost-effective approach for degrading RhB.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20959-20967
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IF 2.324
Wu Xiang-Feng,Zhang Chen-Xu,Wang Yu-Duan,Su Jun-Zhang,Zhang Jia-Rui,Feng Yan-Mei,Zhang Mi,Tong Xin,Zhang Wei-Guang,Sun Xiu-Guo
The Ag 2 CrO 4 /SnO 2 n–n type heterojunction has been fabricated by coupling Ag 2 CrO 4 particles with SnO 2 nanorods via an in situ synthetic method. The photocatalytic degradation mechanism of the as-prepared heterojunction has also been discussed. Characterization results revealed that the as-fabricated Ag 2 CrO 4 /SnO 2 composites could reinforce the photo-degradation competencies for rhodamine B dilute solution compared to pure Ag 2 CrO 4 and SnO 2 samples. As the increase in the molar ratios of Ag 2 CrO 4 –SnO 2 , the photocatalytic degradation efficiency appeared to the tendency of first increasing and then decreasing. When it was 4:10, in 90 min, the as-obtained samples possessed the vintage photocatalytic degradation efficiency of 95.8% among of pure SnO 2 , Ag 2 CrO 4 and the as-prepared composites with various molar ratios, respectively. Furthermore, the Ag 2 CrO 4 and SnO 2 were connected via chemical bonds to form the homogenous heterojunction. It could boost the separation and transfer of the photogenerated holes and electrons. In addition, the holes, hydroxyl and superoxide radicals played a major role during the photodegradation process.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Shan Huang,Mengmeng Wang,Jiajia Liu,Xinqi Liu,Min Xue,Yi Fang,Qi Xiao
Black phosphorus (BP) is highly regarded in photocatalysis for its bandgap thickness dependency, high hole mobility, and broad visible light absorption. This study introduces a simple hydrothermal method to construct a BP QDs/BiVO 4 direct Z-scheme heterojunction. The composite’s crystal structure, morphology, and photochemical properties were comprehensively characterized. The photocatalytic activity was evaluated using Rhodamine B (RhB) degradation under visible light. Notably, BP QDs 0.12% /BiVO 4 exhibited exceptional performance, achieving a 95.4 % RhB degradation after 100 min, three times higher than BiVO 4 alone. The direct Z-scheme heterojunction played a pivotal role in facilitating O 2 − and h + involvement in the degradation process. The interfacial interaction between BP QDs and BiVO 4 significantly enhanced BiVO 4 ′s visible light absorption, preserving its strong oxidation–reduction capacity. This enhancement was further corroborated by DFT simulation calculations. Overall, this study presents a novel approach for constructing efficient Z-scheme photocatalysts based on BP QDs, laying a solid foundation for their application in the field of photocatalytic degradation.
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JOURNAL OF APPLIED PHYSICS
·
2014
·Vol. 116
·期 23
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IF 2.185
Li Muye,Li Fang,He Zhicong,Zhang Junpei,Han Junbo,Lu Peixiang
Two-photon excited fluorescence resonance energy transfer (FRET) between CdTe quantum dots with different emission peaks and Rhodamine B in aqueous solution are investigated both experimentally and theoretically. The photoluminescence and lifetime are measured using a time-resolved fluorescence test system. The two-photon excited FRET efficiency is found to increase as the degree of spectral overlap of the emission spectrum of CdTe and the absorption spectrum of Rhodamine B increases, which is due to the increase of Forster radius of the sample. Moreover, FRET efficiency increases when the ratio of acceptor/donor concentration increases. The two-photon excited FRET efficiency was found to reach 40%.
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Analytical Methods
·
2015
·Vol. 8
·期 5
·1044-1051
·
IF 1.821
Xianfu Meng,Yanxia Xu,Jinliang Liu,Lining Sun,Liyi Shi
A novel fluorescent chemosensor containing two rhodamine B moieties per molecule was synthesized and characterized as an “off–on” fluorescent probe for the detection of copper ions (Cu2+). The crystal structure of the chemosensor was confirmed by X-ray analysis and the recognition mechanism of detecting Cu2+ was proposed with absorption and fluorescence characterization. The chemosensor showed high selectivity and sensitivity and good repetition in sensing Cu2+, and the detection limit is as low as 38.00 nM. In addition, the chemosensor displayed low cytotoxicity as revealed by methyl thiazolyl tetrazolium (MTT) assays and was successfully applied to fluorescence test paper and living cell imaging for detecting Cu2+. Therefore, based on its environmental friendliness and good biocompatibility, the results offered the advantages including the detection of Cu2+ in the environment and bioimaging of intracellular Cu2+.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
·
IF 3.512
Haochi Liu,Xiaohui Ren,Ligang Chen
Adsorptive removal of Rhodamine B (RhB) on a novel kind of magnetic metal–organic framework (MOF) was studied in view of adsorption isotherm, thermodynamics and kinetics. The adsorbent was characterized by physical property measurement system, X-ray diffraction and scanning electron microscopy. The adsorption isotherm of RhB on magnetic MOF followed the Freundlich model. The resultant kinetics data was well described by the pseudo-second-order model. Most of the RhB was removed from the aqueous solution within 30 min. Thermodynamic parameters including Gibbs free energy, enthalpy, and entropy of adsorption were obtained. The result confirmed that the adsorption is controlled by an entropy effect rather than an enthalpy change. The maximum removal has been achieved in the pH range of 4–8 at 150 rpm. The sorbent can be used at least five times after washing with methanol including HCl (0.001 mol L −1 ). The π−π stacking interaction and electrostatic interaction may play an important role in the adsorption of RhB onto magnetic MOF. Compared with other adsorbents, this kind of magnetic material demonstrated a superior dye adsorption capability.
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