APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Can Ma,Shuo Feng,Jinming Zhou,Rufen Chen,Yu Wei,Hui Liu,Sen Wang
The greatest problem in the homogeneous Fenton reaction is the low production of HO owing to the slow Fe III /Fe II cycle. In this study, we demonstrate a new co-catalyst of FeP and trace Fe 2+ that can greatly enhance the decomposition efficiency of H 2 O 2 and accelerate the degradation of methylene blue (MB). This co-catalyst is applicable in a broad pH range (pH = 3.0−9.0) and capable of degrading 95.74% and 89.01% of MB with 100 ppm in concentration within 30 s at pH 3 and 5, and 99.65% and 90.06% within 3 min at pH 7 and 9. The coexistence of FeP with Fe II accelerates the Fe III /Fe II cycle by electron transfer between Fe δ+ in FeP and Fe III . Mössbauer spectra and density functional theory calculations indicate that the unique structure of FeP plays an important role in accelerating the Fe III /Fe II cycle.
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SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Chengzhu Shen,Guolin Song,Guoyi Tang
In this study, spark discharge of atmospheric pressure plasma jets (SDAPPJs) was employed to modify activated carbon (AC) prepared from coconut shells. The physical and chemical properties of AC were tailored by SDAPPJs treatment to enhance the adsorption performance. The pristine AC and its modified samples were characterized by N 2 isotherms, X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) in terms of micro structure, chemical composition, morphology, and etc. The methylene blue (MB) removal capability of these AC samples from aqueous solution was investigated by UV–vis spectrophotometer to determine the influences of the modification on the adsorption performance. The results show that SDAPPJs modification not only improves the specific surface area and total pore volume of AC while maintaining good structural stability, but also increases its surface oxygen-containing functional groups under the influence of active species, which eventually enhances the electrostatic interaction between contaminants and defective surface layers of AC. In brief, SDAPPJs treatment has a positive impact on the adsorption capacity of AC, and its removal efficiency of MB increases by 15.64% when the treatment distance, speed and time are 20 mm, 10 mm/s and 3 min, respectively.
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JOURNAL OF HAZARDOUS MATERIALS
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2026
·
IF 10.6
Hanlin Li,Shuangqin Tian,Xin Wang,Yujing Long,Tianhong Ye,Lihong Tang
When used individually, ZIF-8 suffers from hydrolysis in aqueous media, while CAU-17 is limited by its low specific surface area (64.71 m²/g). Therefore, we employed an in situ self-assembly strategy to construct a MOF-on-MOF heterostructure (CAU-17@ZIF-8) for the synergistic removal of Cd(II) and methylene blue (MB). The composite achieved maximum adsorption capacities of 607.65 mg/g for Cd(II) and 1025.38 mg/g for MB, with a 99% removal efficiency for low-concentration pollutants in real wastewater. Even after five cycles, 75% efficiency was maintained. Mechanistic studies combining batch experiments, characterization, and DFT calculations revealed that the heterojunction interface promotes substantial charge transfer from CAU-17 to ZIF-8, significantly enhancing electrostatic attraction toward cations. Simultaneously, new mesopores formed at the interface increase the specific surface area (239.62 m 2 /g) and provide rapid mass-transfer channels. MB adsorption is governed by electrostatic attraction, hydrogen bonding, and π-π interactions, while Cd(II) adsorption relies on ion exchange, coordination, and electrostatic attraction. This work demonstrates that constructing MOF-on-MOF heterojunctions is a promising strategy to overcome the intrinsic limitations of single MOFs in water remediation, thereby greatly enhancing the adsorption capacity toward methylene blue (MB) and Cd(II).
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INORGANIC CHEMISTRY COMMUNICATIONS
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2022
·
IF 3.428
Yunfeng Lei,Xuezhong Zhang,Xiangyu Meng,Zhifei Wang
The removal of methylene blue (MB) with the magnetic separation in water treatment is of increasing attentions due to its high solubility and chemical stability, which poses a great challenge on the ecological environment and human health. Herein, with assistance of simplified modification strategies, multi-carboxyl functionalized Fe 3 O 4 @SiO 2 magnetic nanoparticles (mCMNPs) have been developed with a novel insight into the grafting densities effects on the adsorption process. The results of UV–Vis spectrometry obviously showed that the increased carboxyl content on the surface of CMNPs resulted in the significant improvement in the removal process of MB. Among different types of CMNPs, mCMNPs were chosen for the separation of MB owing to possessing the highest surface carboxyl densities 0.2363 mmol/g and exhibiting the highest removal efficiency of 96.18%. Several important factors including solution pH, initial MB concentration and sorption time were optimized to achieve the best removal efficiency. Desired adsorption capacity for MB (34.75 mg/g) was achieved using mCMNPs with the pH 10, sorption time of 100 min and initial MB concentration of 50 mg/L. The sorption isotherms and sorption kinetics can be well in agreement with the Langmuir model and pseudo-second-order kinetic model, respectively. Most importantly, the synthesized mCMNPs still exhibited high removal efficiency (63%) after 5 cycle numbers. As adsorbents, it is noted that the prepared mCMNPs possessed the excellent regeneration ability and recyclability and could be a promising adsorbent for the removal of MB in water treatment.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jinming Chen,Powei Gu,Yuting Guan,Haifeng Su
Herein, an effective solid-state pyrolysis method was employed to synthesize CeO 2 (Ce)/biomass carbon(C)@g-C 3 N 4 photocatalyst , which was then used to degrade methylene blue (MB) with high efficiency under visible light irradiation. After 60 min of visible light irradiation, the MB removal rate of Ce/C@g-C 3 N 4 composite photocatalyst reached 96.8%, while the MB removal rates of CeO 2 and g-C 3 N 4 were only 37.8% and 56.3%, respectively. According to the BET and PL results, the Ce/C@g-C 3 N 4 composite material possesses a specific surface area and a low electron-hole recombination rate. The findings of free radical capture experiments and ESR analysis indicated that electron-holes (h + ) and superoxide radicals (•O 2− ) are the most active groups in photodegradation reactions using Ce/C@g-C 3 N 4 composite. Furthermore, after five consecutive cycles, the photocatalytic activity of the Ce/C@g-C 3 N 4 composite material remained steady. This work provides a facile approach for the fabrication of highly stable Ce/C@g-C 3 N 4 photocatalyst with high photocatalytic activity making it a promising material for the photodegradation of methylene blue under visible-light conditions.
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POWDER TECHNOLOGY
·
2022
·
IF 5.64
Bo Lv,Bobing Dong,Chuanxiang Zhang,Zengqiang Chen,Zeya Zhao,Xiaowei Deng,Chaojun Fang
Methylene blue (MB) pollution in wastewater has become an environmental problem. Batch and continuous adsorption experiments were performed to study the adsorption mechanism of MB by coal gangue-based zeolite granules in a fluidized absorber. The results showed that MB adsorption of coal gangue-based zeolite granules was mainly chemical adsorption in a fluidized bed , which was mainly affected by its size fraction ( d ), fluid velocity ( v ), bed weight ( m ), and initial concentration ( c o ). Under suitable operating conditions ( d ≤ 0.5 mm, v = 1.3 v mf (i.e., minimum fluidization velocity), m = 100 g, and c o = 100 mg/L), the fluidized bed formed by zeolite granules had the best adsorption performance for MB, with an adsorption saturation of 0.444 g/g and an equilibrium uptake of 108.041 mg/g, which is higher than that of the traditional packed bed. The results provide a theoretical basis for the industrial application of coal gangue-based zeolite granules.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·876-889
·
IF 2.606
Luo Qiuzi,Sun Yihua,Lv Xin,Huang Long,Fang Liang,Wang Rui
Al and Ga were co-doped into ZnO lattice (AGZ) by the sol–gel method. Herein, graphite carbon nitride (g-C 3 N 4 ) was synthesized by using the thermal decomposition method, which was used to integrate with the obtained AGZ to create direct Z-scheme Al/Ga co-doping biphasic ZnO/g-C 3 N 4 heterojunction by the simple single-phase dispersion method. The synthesized catalysts of composition, optical properties, topography structure and chemical state of element of the prepared AGZ/g-C 3 N 4 composites were analyzed by XRD, FT-IR, UV, PL, TEM and XPS respectively. The results have shown that the combination of AGZ and g-C 3 N 4 to form a direct Z-type heterojunction can effectively reduce the band gap of AGZ, thereby shifting the absorption edge to the visible light region. The PL spectroscopy study of the synthesized sample found that, compared with bare g-C 3 N 4 or AGZ catalyst, AGZ/g-C 3 N 4 significantly reduced the recombination of photogenerated electrons and holes, thereby ensuring that more reactive groups participate in the dye degradation process. The degradation experiment of methylene blue(MB) dye verifies that the AGZ/CN sample has excellent photocatalytic performance. Al/Ga co-doped ZnO/g-C 3 N 4 catalyst showed the maximum photocatalytic MB degradation of 95.4% after 150 min in visible light illumination, while the degradation efficiency of ZnO and g-C 3 N 4 are only 30.5% and 50.1%, respectively. It have observed that ·O 2 − , ·OH and h + radicals were the main active species that affect the photocatalytic degradation of dyes by radical trapping experiment. In addition, the heterojunction formed by AGZ and g-C 3 N 4 inhibited the photocorrosion of ZnO, which was confirmed by these five consecutive dye degradation tests. At the same time, in order to determine the optimal compounding ratio, four groups of AGZ/CN with different ratios were prepared. It was found that AGZ/CN15 has the highest catalytic efficiency, and the degradation of MB reached 94% within 2.5 h. This work will open up a new path for the development of more effective photocatalysts for organic matter treatment.
Graphical abstract
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Naiku Xu,Jiao Han,Yan Feng,Changfa Xiao
Membrane process is used to decontaminate dye wastewater. In the process of separation, the adsorbed and/or rejected dyes can greatly foul the membrane and negatively affect separation efficiency. Fenton oxidation can non-selectively mineralize dyes to prevent fouling the membrane. Therefore, this work focused on synthesizing the membrane coupled with Fenton catalyst for dye wastewater treatment . Polyacrylonitrile (PAN)/poly (acrylic acid) (PAA) composite nanofiber membrane was first prepared by layer-by-layer sequential electrospinning and then served as the substrate to load iron ions by the coordination of carboxyl groups of PAA with iron ions , after which a catalytic membrane was successfully prepared. During the application process, water would inevitably elute some iron ions from the catalytic membrane. In order to minimize the loss of iron ions, another PAA/PAN composite nanofiber membrane with the function of rejecting iron ions was then designed and superimposed onto the catalytic membrane using the adhesiveness of upper PAA layer. In this sense, the obtained composite membrane can stably catalyze H 2 O 2 to effectively oxidize methylene blue (MB) due to low leaching-out of iron ions. The results showed that the iron ion loading ratio of PAN/PAA composite nanofiber membrane was increased by 167% compared to that of PAN nanofiber membrane, and the total iron ion elution ratios of PAN nanofiber membrane and PAN/PAA composite nanofiber membrane were 27 times and 6 times higher than that of superimposed composite membrane , respectively. As a result of high loading and low elution of iron ions, the superimposed composite membrane exhibited considerably stable efficiency for MB removal within 30 operation cycles, which reached up to 97.0%. Additionally, the superimposed composite membrane presented better mechanical property and more adjustable permeation flux than the control membranes, so that it would show a great potential for the application in the field of dye wastewater treatment .
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Analytical Methods
·
2021
·Vol. 13
·期 9
·1154-1163
·
IF 2.896
Chang Yin,Qianfen Zhuang,Qin Xiao,Yong Wang,Jianhua Xie
A ratiometric electrochemical sensor for caffeic acid (CAE) detection was constructed using a glassy carbon electrode modified with poly(methylene blue) and flower-like nickel-based metal organic frameworks (PMB@Ni–TPA/GCE). The electrochemical behavior of CAE was investigated at the PMB@Ni–TPA/GCE, and was found to follow a two-electron, two-proton electrooxidation process. PMB was used as the internal reference probe, and Ni–TPA can enhance the electrochemical signals of both CAE and PMB. As the CAE concentration increases, the oxidation peak current of CAE is enhanced but that of PMB keeps almost unchanged. The oxidation peak current ratio between CAE and PMB recorded by differential pulse voltammetry changes linearly with CAE concentration over the range of 0.25–15.0 μM, with a detection limit of 0.2 μM. The proposed sensor was successfully employed to evaluate the total polyphenolic content as CAE equivalent in chrysanthemum tea, and the results were comparable with those given by the reference Folin–Ciocalteu spectrophotometry.
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PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215601
·
IF 3.551
Dongming Zhang,Mingpeng Chen,Haiyuan Zou,Yumin Zhang,Jicu Hu,Huapeng Wang,Baoye Zi,Jin Zhang,Zhongqi Zhu,Lele Duan,Qingju Liu
To address the urgent issues of hazardous gas detection and the prevention of environmental pollution, various functional materials for gas sensing and catalytic reduction have been studied. Specifically, the p-type perovskite LaFeO3 has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO3-based p-n heterojunctions. In this work, α-Fe2O3 was further compounded with LaFeO3 to form a porous and hollow α-Fe2O3/LaFeO3 heterojunction to improve its gas-sensing performance and photocatalytic efficiency via a microwave-assisted hydrothermal method. While evaluated as sensors of acetone gas, the optimized sample exhibits excellent performance, including a high response (48.3), excellent selectivity, good reversibility, fast response, and recovery ability. Furthermore, it is an efficient catalyst for the degradation of methylene blue. This can be attributed to the enhancement effect of its larger specific surface area, fast diffusion, enhanced surface activities, and p-n heterojunction. Additionally, this work provides a rapid and rational synthesis strategy to produce metal oxides with both enhanced gas-sensing performance and improved photocatalytic properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Wei Wei,Xuan Han,Mengjia Zhang,Yong Zhang,Yong Zhang,Chunmiao Zheng
Humic acid (HA) is well-known for its chelating activity towards various contaminants, but it dissolves in water thus cannot be used alone as an adsorbent. By immobilizing HA to the surface of nano-hydroxyapatite (nHAP), a novel HA-nHAP adsorbent was prepared. The composition and surface morphology of the obtained HA-nHAP composite were studied in detail. Adsorptive removal of Cu(II) and Methylene blue (MB) using HA-nHAP in single and binary systems were investigated. Results indicated that HA-nHAP exhibited efficient removal of Cu(II) and MB with a favorable adsorption at higher pH. The mechanisms involved in adsorption of Cu(II) and MB were electrostatic interaction and surface complexation. Optimization study using central composite design (CCD) based response surface methodology (RSM) was performed and 3-D response surfaces were plotted from the mathematical model. The optimum conditions were found to be 2.2 g/L (adsorbent dosage), 8 h (contact time), 25 mg/L (initial Cu(II) concentration), and 85 mg/L (initial MB concentration). At optimum conditions, removal rates of Cu(II) and MB were 97.68% and 100%, respectively. The adsorption kinetics and equilibrium fitted well with Elovich and Langmuir models, respectively. Desorption studies confirmed that HA-nHAP adsorbent could be effectively regenerated and reused.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Sihua Zeng,Jisuan Tan,Xu Xu,Xiaohua Huang,Li Zhou
Despite impressive progress of macromolecular encapsulation technique based on hyperbranched polymer (HP), the use of natural HP for guest encapsulation has rarely been reported. Herein, we present the simple synthesis of amphiphilic PGP-DC from natural peach gum polysaccharide (PGP) and demonstrate that the PGP-DC can be utilized as a robust host for encapsulation of dye molecules from water. The influences of initial dye concentration, dosage of PGP-DC, pH, ionic strength , and encapsulation mode on the encapsulation were systematically studied. The PGP-DC simultaneously exhibited fast encapsulation rate and superior encapsulation capability. Under optimal conditions, the encapsulation capacity of PGP-DC towards methylene blue (MB) (1 mM) can reach as high as 182.67 mg/g, which compares favorably to other separation techniques. Moreover, the MB-encapsulated PGP-DC could be well regenerated in acidic solution. Based on its simple synthetic process, excellent encapsulation performance and fine reusability, the PGP-DC holds great promise for using as a host for practical encapsulation applications.
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