Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Wanqi Zhang,Runchen Zhu,Fakang Pan,Chao Xie,Junyong He,Zijian Wu,Yulian Li,Yahui Li,Jiandong Lu,Peidong Hong,Lingtao Kong
The development of suitable catalysts poses a challenge for the peroxymonosulfate (PMS) activation system used in decontamination process. Here we constructed a series of vacancy-strengthened Cu/Co composite oxides (CuCoO) composed of CuCo 2 O 4 and CuO containing multiple Lewis acid sites. The results demonstrate that the as-prepared CuCoO-2 exhibited exceptional activation performance, broad-ranging degradation capacity, remarkable reusability and stability. The optimized CuCoO-2+PMS system achieved complete removal of methylene blue (MB) in 40 min, while maintaining a degradation efficiency of above 86 % even after 5 cycles. A comprehensive survey revealed that hydroxyl radical (·OH), sulfate radical (SO 4 .- ) and singlet oxygen ( 1 O 2 ) collectively contribute to the degradation of MB in the CuCoO-2+PMS system. Especially, 1 O 2 was the dominant active species. The synergism of various Lewis acid sites (Cu +/2+ , Co 2+/3+ and V O/N ) as unsaturated surface-bound centers played a pivotal role in promoting non-radical-driven activation of PMS. Meanwhile, the generated V O/N facilitated enhanced metallic valence circulation in CuCoO-2, strengthening electron mediation between PMS and MB. Additionally, possible degradation pathways and toxicity evaluations of MB and its intermediates were proposed. In conclusion, this work offers valuable insights into PMS activation by vacancy-strengthened CuCoO and is of great significance for water purification.
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JOURNAL OF MATERIALS SCIENCE
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2024
·
IF 3.5
Zhang Mengmeng,He Zhaojun,Li Zuojia,Deng Biao,Ren Honghe
Combination of adsorption and photocatalytic degradation is an effective strategy for rapid elimination of organic pollutants from contaminated water. Herein, in order to improve the dispersion of catalyst, increase the reactive sites and facilitate the recovery of catalyst, a magnetic silver phosphate/strontium ferrite/graphene oxide (ASG) ternary composite was constructed through a two-step method. According to PL, UV–vis and photoelectrochemical characterization and adsorption experimental results, the ASG exhibits enhanced light absorption, reduced band gap, increased photocurrent response and improved adsorption ability compared to Ag 3 PO 4 and Ag 3 PO 4 /SrFeO. ASG showed remarkable adsorption–photocatalytic synergistic removal effect on levofloxacin (LEO) and methylene blue (MB). At room temperature, for 20 mg/L of initial LEO concentration, 0.67 g/L of ASG can absorb 80.7% of LEO, while the removal rate increases up to 95.5% under visible light irradiation within 180 min; for 20 mg/L of initial MB concentration, 0.67 g/L of ASG can absorb 100% of MB with 90 min, while the elimination time can be shortened to 45 min through adsorption–photocatalytic synergy. The cyclic experiments showed that the removal rates of LEO and MB by ASG remained above 80% after 5 adsorption–photocatalytic cycles, indicating that ASG has good stability and availability. In addition, a possible mechanism for removing LEO and MB by ASG is proposed based on the free radical capture experimental, UV–vis and photoelectrochemical results, which provides references for the rational design and construction of magnetic multifunctional photocatalysts for the efficient removal of organic contaminants in practical wastewater. Graphical abstract
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Materials
·
2024
·Vol. 17
·期 18
·4546
·
IF 3.1
Li Liu,Zhenghao Cui,Bo Feng,Mengjing Sui,Huaqin Huang,Zhaoyang Wu
In this study, novel Fe2O3/TiO2photocatalytic composites were synthesised by combining traditional oxidation roasting with the sol-gel method, using low-cost metallurgical waste (iron scales) as the raw material. The characterisation results revealed that the oxidised iron scales could be transformed into high-purity and porous Fe2O3particles through oxidation roasting, thereby providing additional sites for the adsorption process and thus serving as an effective carrier for TiO2-based photocatalytic materials. During the sol-gel process, TiO2was loaded onto the synthesised Fe2O3particles, generating core-shell heterostructure Fe2O3/TiO2photocatalytic composites. Under visible light irradiation for 90 min, the Fe2O3/TiO2photocatalytic composites achieved a remarkable methylene blue removal rate (97.71%). This reaction process followed the quasi-first-order kinetic model with a rate constant of 0.038 min−1. The results have demonstrated that this combination of various components in the Fe2O3/TiO2photocatalytic composites improved the adsorption, light utilisation, and charge separation effect of the photocatalysts. Moreover, the material exhibited favourable stability and recyclability, making it a decent candidate for the treatment of wastewater from the biochemical industry. Therefore, this study provides a new strategy for improving the photocatalytic activity of TiO2and expanding the high value-added utilisation of iron scales.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
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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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Biosensors-Basel
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2024
·Vol. 14
·期 10
·457
·
IF 4.9
Zhuo Liu,Fengyu Liu,Chaofan Wang,Hongjuan Li,Yongqian Xu,Shiguo Sun
Herein, we report a ratio-based electrochemical biosensor for the detection of interleukin-6 (IL-6). We electropolymerized methylene blue (MB) on the surface of screen-printed carbon electrodes; introduced an internal reference signal probe; modified the carboxylate multi-walled carbon nanotubes on the electrode surface to increase the electrochemically active area; and finally linked the amino-modified IL-6 aptamer to the electrode surface through the Schiff base reaction, with bovine serum albumin (BSA) added to mask non-specific adsorption. After adding IL-6 to the samples, the signal of I MB remained almost unchanged, while the signal of I[Fe(CN) 6 ] 3−/4− decreased with increasing IL-6 concentration. Thus, a novel ratiometric electrochemical sensor with a linear range of 0.001~1000.0 ng/mL and a low detection limit of 0.54 pg/mL was successfully developed. The sensor had high repeatability, stability, sensitivity, and practicability. It provides a new method for constructing proportional electrochemical sensors and detecting IL-6.
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ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Fengrong Zhang,Cuilan Zhang,Binghan Zhang,Dandan Han,Longwei Du,Lishun Wu
Blast furnace slag (BFS) is a kind of waste produced in industrial production, as well as a valuable secondary resource. In this paper, layered double hydroxides composites (BFS/LDHs) were prepared by aqueous polymerization, with industrial waste BFS as modifier and magnesium nitrate, aluminium nitrate, and urea as raw materials. BFS/LDHs have been characterized by using scanning electron microscopy (SEM), fourier infrared spectrometer (FT IR), x-ray diffraction (XRD), and the specific surface area analyser (BET). The adsorption of BFS/LDHs on Cu (II) and methylene blue (MB) was investigated by batch experiments. The results showed that the adsorption capacity of BFS/LDHs to Cu (II) is stronger than that of MB. What’s more, the solid concentration effect was found in the process of sorption kinetics and sorption isotherms. The sorption kinetics curves of Cu (II) and MB on BFS/LDHs were well fitted by the quasi-second-order kinetics under different adsorbent concentrations. Langmuir and Freundlich sorption isotherm models were used to analyse the adsorption. It showed that the adsorption conforms to Langmuir and Freundlich’s adsorption isotherm models. The BFS/LDHs composites have good recycling availability in this adsorption process of Cu (II) and MB, the removal capacity of which was reduced by 16.1% and 3.8% after being recycled for six times, respectively. More importantly, BFS/LDHs composites are not only expected to become a sewage treatment agent, but also to solve the problem of industrial waste treatment, which is a win–win strategy.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Chunlai Wu,Aimaiti Gali,Chuanyun Peng,Yalei Miao,Juan Li,Xinyu Gao
The treatment of dye wastewater is of crucial significance for alleviating water pollution, ensuring ecological security and achieving the sustainable utilization of water resources. In this work, the 1-allyl-3-butylimidazolium chloride ionic liquid modified Co/Fe-LDH (Co/Fe-LDH@IL) was successfully synthesized and explored for elimination Methylene Blue (MB) from aqueous solutions. Characterizations revealed that the incorporation of ionic liquids notably increased the specific surface area from 5.37 m2.g−1 to 8.15 m2.g−1. Additionally, the number of surface active sites, was significantly enhanced. For a 25 mL MB solution with an initial concentration of 300 mg.L−1, the optimal dosage of Co/Fe-LDH@IL was determined to be 30 mg, achieving adsorption equilibrium within 20 min. Under these conditions, the maximum adsorption capacity was 517.43 mg.g−1. Kinetic studies indicated that the pseudo-second-order model accurately described the process. The Langmuir isotherm model provided a better fit than the Freundlich model, indicating a homogeneous monolayer adsorption mechanism. Column adsorption experiments further validated the superior performance of Co/Fe-LDH@IL in treating MB solutions of different concentrations. The adsorption mechanism involved electrostatic interactions, interface regulation by IL molecules, and monolayer π-π interaction adsorption on imidazole functional group. Co/Fe-LDH@IL exhibits outstanding adsorption performance and stability, showing great potential for efficiently treating MB-containing wastewater.
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RSC Advances
·
2025
·Vol. 15
·期 38
·31508-31521
·
IF 4.6
Donghai Li,Yunrui Xu,Shilin Zhang,Linping Wang
To improve the utilization of solar energy and the efficiency of photocatalytic organic pollutant degradation, novel Z-scheme heterojunctions with high visible light catalytic performances have been widely developed. Herein, a novel Z-scheme BiFeO3/Ag/g-C3N4 heterojunction with a hierarchical 1D/0D/2D structure and visible light absorption was constructed by matching the suitable band structure between 1D BiFeO3 and 2D g-C3N4 and employing the localized surface plasmon resonance (LSPR) effect of 0D Ag nanoparticles. BiFeO3 nanofibers were synthesized via the electrospinning technique, providing short electron transport paths and visible light absorption range for g-C3N4. Plasmonic Ag nanoparticles were photodeposited on the surface of BiFeO3 to enhance the separation efficiency of the photogenerated electron–hole pairs between the bulk interfaces. UV-vis DRS, PL, photocurrent and EIS spectra confirmed the important roles of Ag and BiFeO3 in improving the photocatalytic activity of the Z-scheme heterojunction. The working principle of the BiFeO3/Ag/g-C3N4 Z-scheme heterojunction was proposed, indicating that ˙O2− and ˙OH are the main active species for the photocatalytic degradation of methylene blue (MB). The prepared BiFeO3/Ag/g-C3N4 heterojunction exhibited the highest photocatalytic activity, where its rate constant was 5.84 times higher than that of the pristine BiFeO3 and 3.26 times higher than that of the pristine g-C3N4. This study offers a new means for the design of novel high-performance photocatalysts, which can be a promising candidate in industrial applications.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Ling-Ling He,Xiao-Yan Li,Jing-Yi Bai,Song Li,Shuang Qi,Xin Wang,Yu Li
A novel ZnWO 4 /MgWO 4 n-n heterojunction (0.9% ZnWO 4 /MgWO 4 ) was fabricated successfully and characterized by different techniques. The methylene blue (MB) was removed to confirm the sonocatalytic activity by the 0.9% ZnWO 4 /MgWO 4 composite. The sonocatalytic removal ratio of MB using MgWO 4 was 40.04±4.34(%). It was significantly increased to 93.82±3.44(%) in the presence of 0.9% ZnWO 4 /MgWO 4 composite. The significantly improved sonocatalytic performance was due to the form of n-n heterojunction, which could hinder the recombination of electron and hole ( e − - h + ) pairs effectively. The mechanism showed that hydroxyl radical (•OH) and h + had important roles for the elimination of MB. Moreover, the 0.9% ZnWO 4 /MgWO 4 composite had remarkable stability during the process of MB removal under the ultrasonic irradiation. The results suggested that the fabrication of heterojunction is a valid method to promote the sonocatalytic performance of catalyst. The results of this paper would provide valuable references for the development of new sonocatalysts used in environmental remediation.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-8
·
IF 5.705
Wang Zonghua,Yu Gege,Xia Jianfei,Zhang Feifei,Liu Qingyun
The authors demonstrate the exploitation of reduced graphene oxide (RGO) as a template for immobilizing zeolitic imidazolate framework-8 (ZIF-8) crystals loaded with the electrochemical probe Methylene Blue (MB). The framework was deposited on the surface of RGO in a one-pot process. Transmission electron microscopy, scanning electron microscopy and X-ray diffraction were employed to characterize the nanocomposite. The electrochemical behavior of rutin at a glassy carbon electrode (GCE) modified with the nanocomposite was investigated by cyclic voltammetry and differential pulse voltammetry. The modified GCE displays high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.4 V vs. Ag/AgCl). Under the optimal conditions, the sensor has an amperometric response that is linear in the 0.1 to 100 μM rutin concentration range, with a 20 nM detection limit (at an S/N ratio of 3). The method was successfully applied to the determination of rutin in tablets and urine samples.
The zeolitic imidazolate framework ZIF-8 was loaded with Methylene Blue and deposited on the surface of reduced graphene oxide. A glassy carbon electrode was modified with the nanocomposite and then used for the determination of rutin with a 20 nM detection limit and a linear range from 0.1 to 100 μM.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zheng-Wei Ma,Kai-Ning Zhang,Zhi-Jin Zou,Qiu-Feng Lü
A novel activated carbon (C CH-TS ) derived from chitosan hydrogel (CH) coated tea saponin (TS) was prepared to investigate its removal performance for methylene blue (MB). C CH-TS was characterized by thermogravimetric analysis , field-emission scanning electron microscope , fourier transform infrared spectroscopy , X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller, and zeta potential analysis. The results showed that C CH-TS had a high specific area of 3504 m 2 /g with a large pore volume of 6.03 m 3 /g. In the batch mode adsorption experiments, the effects of initial pH values, adsorbent concentration, initial MB concentration and contact time, and adsorption temperature on the adsorption performance of C CH-TS for MB were studied. The experimental results were fitted by pseudo-first-order kinetic, pseudo-second-order kinetic and intra-particle diffusion models. Furthermore, Langmuir, Freundlich and Temkin isotherms were employed to analyze the equilibrium adsorption data. It was found that these data were fitted to Langmuir isotherm best with a maximum adsorption capacity of 604.10 mg/g, while pseudo-second-order kinetic model could describe the adsorption process more accurately. Thermodynamic analysis implied that the adsorption process was spontaneous and exothermic. Therefore, a facile one-step route to preparation of activated carbon with a high specific area and efficient dye removal ability was achieved.
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Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 4
·2231-2246
·
IF 1.843
Luo Qiuzi,Sun Yihua,Guo Jin,Zhang Jiangyu,Fang Liang
The properties of ZnO nanoparticles doped with titanium ions (Ti 4+ ) and gallium ions (Ga 3+ ) were modified by sol–gel method. Considering the ion radius of doped metal elements, the radius of Zn ions and the doping limit of ZnO, the doping rate of Ti is fixed at 1 atom%, and the optimal doping amount of Ga is discussed. The Ga/Ti co-doped ZnO nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet/visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared spectroscopy. XRD results show that Ga/Ti co-doped ZnO has hexagonal wurtzite phase structure. With the increase of Ga doping concentration, the particle size of ZnO decreases. Through photoluminescence analysis, it is found that the absorption of Ga/Ti co-doped ZnO in the visible region moves to the long wave direction. In addition, with the increase of Ga doping, the particle size of GTZ powder first decreases and then increases, the band gap also decreases and then increases. When the doping amount of Ga is 1.5 atom%, the photocatalytic activity is the best. The degradation rate of MB was 90% within 2.5 h. Ga/Ti co-doped ZnO nanoparticles have good photocatalytic properties and low cost. They are a promising catalyst for wastewater treatment.
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