COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xinpeng Chen,Aijing Li,Jiabao Wu,Jin Cheng,Desheng Sha,Yurong Sun,Yifeng Wang,Tieling Xing,Guoqiang Chen
The majority of efficient photocatalysts are powder-like, making recycling difficult. In this work, carbon cloth (CC) was used as the substrate, two MOF cloth composites MIL-88@CC and MIL-100@CC were prepared at room temperature , and the morphology and structure of MOF cloth composites were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared-attenuated total reflectance (FTIR), X-ray photoelectron spectroscopy (XPS). The results of photocatalytic degradation tests show that the two heat-treated MOF cloth composites have excellent degradation effects on MB . The two MOF cloth composites can degrade above 97 % of MB (20 mg/L) within 30 min under the irradiation of 250 W high-pressure mercury lamp and stirring, far exceeding the raw MOF cloth. The presence of oxygen vacancy defects is thought to have improved the heat-treated MOF cloth's photocatalytic efficiency by upsetting the symmetry of the material and facilitating electron and hole separation.·OH and·O 2 - were found to be the main reactive oxygen species (ROS) involved in the degradation process, according to quenching studies and electron spin resonance (ESR) research. In addition, the macroscale MIL-88@CC and MIL-100@CC have considerable potential for degrading dyes, which presents a practical solution to sustainable development concerns.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 32
·79282-79296
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IF 5.8
Zhong Yu,Wan Xiancheng,Lian Xiaoyan,Cheng Wenyu,Ma Xiaoying,Wang Dongtian
Rational treatment of drinking water treatment residues (WTR) has become an environmental and social issue due to the risk of secondary contamination. WTR has been commonly used to prepare adsorbents because of its clay-like pore structure, but then requires further treatment. In this study, a Fenton-like system of H-WTR/HA/H 2 O 2 was constructed to degrade organic pollutants in water. Specifically, WTR was modified by heat treatment to increase its adsorption active site, and to accelerate Fe(III)/Fe(II) cycling on the catalyst surface by the addition of hydroxylamine (HA). Moreover, the effects of pH, HA and H 2 O 2 dosage on the degradation were discussed with methylene blue (MB) as the target pollutant. The mechanism of the action of HA was analyzed and the reactive oxygen species in the reaction system were determined. Combined with the reusability and stability experiments, the removal efficiency of MB remained 65.36% after 5 cycles. Consequently, this study may provide new insights into the resource utilization of WTR. Graphical Abstract
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Journal of the Iranian Chemical Society
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2023
·Vol. 20
·期 7
·1671-1680
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IF 2.4
Liu Yani,Xu Lei,Feng Runtian,Zou Tong,Wang Yongcheng
The adsorptive removal of methylene blue (MB) from aqueous solution is often executed by attapulgite (ATP) due to its unique one-dimensional nanoscale structure and low-cost, abundant, eco-friendly advantages. Another commonly used material for this job is activated carbon. In this study, a novel composite porous ceramsite was prepared by combining activated carbon and ATP clay to remove MB from an aqueous solution. The composite porous ceramsite, calcined at 450 °C (CPC-450), was characterized by SEM, FT-IR, XRD, and BET specific surface area measurements. It possessed a high specific surface area of 313.606 m 2 /g and exhibited superior adsorption capacity toward MB than that of raw ATP. Consequently, a 99.6% MB removal efficiency was achieved at adsorption equilibrium. Moreover, the maximum adsorption capacity of CPC-450 increased compared to the raw ATP, with a value of 50.68 mg/g, and it could be reused more than 6 times. The adsorption experiment was executed at different conditions, and the Langmuir isotherm model and pseudo-second-order kinetic equation fitted the obtained data very well. The main driving forces for the adsorption process were found to be hydrogen-bonding interaction, electrostatic attraction, and chemical association.
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International Journal of Electrochemical Science
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2023
·
IF 1.5
En Shi,Xin Wang,Miao Zhang,Xinyu Wang,Jianchun Gao,Yunbin Zheng,Xinqiao Zhu
In order to enhance visible-light photocatalytic activity, anatase TiO 2 was modified with sludge-derived activated carbon (SDAC) through the physical mixing and hydrothermal method, respectively. The activated carbon was prepared from sewage sludge by molten salt method. Under visible light irradiation, the removal of methylene blue (MB) with a concentration of 40 mg L -1 by TiO 2 -SDAC synthesized through the physical mixing and hydrothermal method were up to 70.13% and 95.48%, respectively. Characterization results revealed that a Ti-C bond was formed on the surface of TiO 2 -SDAC. Under physical mixing and hydrothermal treatment, carbon atoms can be introduced into the TiO 2 lattice, resulted in tuning the band gap of TiO 2 and extending its optical response to the visible-light region. The photocatalytic degradation of MB was fitted well with Elovich model. It can be concluded that SDAC adsorbs, supports and enhances the photocatalytic activity of TiO 2 .
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DIAMOND AND RELATED MATERIALS
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2023
·
IF 4.1
Minghui Duan,Guo Zeng,Jian He,Weiguo Wang
Carbon nitride (g-C 3 N 4 ) is a potential material that can be used for the treatment of the wastewater contains organic dyes. However, the photocatalytic efficiency of g-C 3 N 4 is limited by the wide band gap and fast recombination of photon-generated carriers. In this work, the co-doped with Mg and Zn of Mg Zn 0.07 -g-C 3 N 4 was designed and prepared to enhance the photocatalytic efficiency. The co-doped Mg and Zn shorted the band gap of g-C 3 N 4 from 2.74 eV to 2.50 eV. Interestingly, according to the DFT calculation, a Zn-bridge is formed between the interlayers of g-C 3 N 4 . The Zn-bridge reduces the electron localization and prolongs the existence time of photon-generated carriers. The as-prepared Mg Zn 0.07 -g-C 3 N 4 was applied for the photodegradation of methylene blue. The degradation ratios and photodynamic parameter of Mg Zn 0.07 -g-C 3 N 4 are higher than that of g-C 3 N 4 and Mg-g-C 3 N 4 (29.51 × 10 −3 min vs 8.00 × 10 −3 min).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Zhenyu Jing,Yanhui Li,Yang Zhang,Mingzhen Wang,Yaohui Sun,Kewei Chen,Bing Chen,Shiyong Zhao,Yonghui Jin,Qiuju Du,Xinxin Pi,Yuqi Wang
Zirconium alginate/graphene oxide (ZA/GO) hydrogel spheres were prepared by crosslinking sodium alginate and GO with Zr 4+ . Then Zr 4+ on the surface of the ZA/GO substrate acted as the metal nucleation site of the UiO-67 crystal and interacted with the organic ligand biphenyl 4-4′-dicarboxylic acid (BPDC) to make UiO-67 grow in situ on the surface of the ZA/GO hydrogel sphere by the hydrothermal method . The BET surface areas of ZA/GO, ZA/UiO-67, and ZA/GO/UiO-67 aerogel spheres were 1.29, 47.71, and 89.33 m 2 /g respectively. The maximum adsorption capacities of ZA/GO, ZA/UiO-67, and ZA/GO/UiO-67 aerogel spheres for methylene blue (MB) at room temperature (298 K) were 145.08, 307.49, and 1105.23 mg/g respectively. The kinetic analysis showed that the adsorption process of MB on the ZA/GO/UiO-67 aerogel sphere was consistent with the pseudo-first-order kinetic model. Isotherm analysis showed that MB was adsorbed on ZA/GO/UiO-67 aerogel spheres as a single layer. Thermodynamic analysis showed that the adsorption process of MB on the ZA/GO/UiO-67 aerogel sphere was exothermic and spontaneous. Adsorption of MB on ZA/GO/UiO-67 aerogel spheres is mainly dependent on π-π bond, electrostatic interaction, and hydrogen bond . After 8 cycles, ZA/GO/UiO-67 aerogel spheres still showed high adsorption performance and good reuse ability.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3410
·
IF 4.6
Yuyu He,Liangmeng Ni,Qi Gao,Hao Ren,Mengfu Su,Yanmei Hou,Zhijia Liu
To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.Keywords:bamboo shoot shell;activated carbon;adsorption process;methylene blue;K2FeO4
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RSC Advances
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2018
·Vol. 8
·期 66
·37715-37723
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IF 2.936
Yinli Liu,Dequn Wu,Xueli Wang,Jianyong Yu,Faxue Li
Considering the excellent thermo-mechanical properties, chemical stability and low cost of biodegradable aliphatic–aromatic copolyesters, they are an ideal matrix when functionalized for capturing pollutants in wastewater. In this work, biodegradable poly((butylene succinate-co-terephthalate)-co-serinol terephthalate) (PBSST) copolyesters with amino side group (–NH2) were first synthesized through copolymerization, followed by grafting carboxymethyl-β-cyclodextrin (CM-β-CD) into PBSST molecular chains via amidation reaction to prepare PBSST-g-β-CD. The corresponding nanofibrous membranes were then fabricated by electrospinning as adsorbents for efficiently removing cationic dye methyl blue (MB) from aqueous solutions. The adsorption performance of the nanofibrous membranes was fitted well with pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity was 543.48 mg g−1 for MB along with a removal efficiency of 98% after five regeneration cycles, indicating the high adsorption capacity and good recyclability of nanofibrous membranes. The adsorbents possess features of high adsorption capacity, eco-friendliness and easy operation, and exhibit great potential for disposing of printing-dying wastewater.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Xiaoli Zhu,Jibo Dou,Qiang Huang,Xiaoyong Zhang,Yen Wei
The development of functionalized carbon nanotubes (CNTs) for environmental application is an area of research that holds great promise and intense interest. In this study, an organic-inorganic CNTs composite was synthesized via a novel “one-pot” route and was used as an adsorbent for removal of methylene blue (MB) from aqueous solution. At first, furfural as a diene was covalently anchored onto the surface of pristine CNTs through the Diels–Alder (DA) cycloaddition reaction. Then, the Kabachnik–Fields (KF) reaction, a nearly century-old multicomponent reaction, was rediscovered as an efficient “connector” which conveniently builds up polymer architectures on CNTs surfaces under rather mild conditions (including air atmosphere, aqueous solution, and catalyst-free). The surface morphology and chemical structure were analyzed by transmission electron microscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy. Moreover, adsorption characteristics of MB on the as-prepared CNTs adsorbents were examined by varying experimental conditions such as contact time, solution pH, temperature and initial MB concentration. It was shown that the removal process was pH dependent. Kinetics indicated that the adsorption equilibrium can be achieved within 20 min and experimental data were best described by the pseudo-second-order model. The adsorption isotherms data were preferably fitted to the Langmuir model, yielding the maximum adsorption capacity of 346.88 mg/g. The thermodynamic study suggested that the adsorption process is endothermic and spontaneous in nature. It is concluded that the possible mechanisms of adsorption may be attributed to π–π stacking or electrostatic interaction. These results suggested that the modified CNTs based composite is expected to be a new candidate for dye removal. More importantly, we believe that the current work paves a facile and green way to fabricate new libraries of CNTs/polymer functional materials via the combination of DA reaction and KF reaction and might prompt the broader study of the KF reaction in interdisciplinary fields.
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ANALYST
·
2019
·Vol. 144
·期 20
·5971-5979
·
IF 4.019
Zhiqiang Chen,Shuang Liu,Xiaoxiao Yu,Lijie Hao,Li Wang,Shufeng Liu
Alkaline phosphatase (ALP) is an important enzyme related to many clinical diseases and also widely used as a labeling enzyme for immunoassay. Herein, a new electrochemical sensing strategy for ALP activity was proposed, which was based on the ALP-triggered methylene blue (MB) release from a lanthanide coordination polymer and successive penetration through a self-assembled dodecanethiol monolayer for electrochemical response. The supramolecular lanthanide coordination polymer was constructed by using guanine monophosphate (GMP) and Tb3+ as the ligand and the metal ion, respectively, and the encapsulated MB as the signal molecule. ALP catalyzed the cleavage of the phosphate group from the GMP ligand and disrupted the coordination polymer network to release abundant MB molecules for electrochemical responses related to ALP activity. The obtained lanthanide coordination polymers were well characterized by various techniques. The fabricated electrochemical sensor for ALP activity assay shows distinct advantages such as being one-step, label-free, immobilization-free and highly sensitive. The detection limit toward ALP activity was down to 0.5 U L−1. With the aid of a MB enrichment process on the modified electrode before measurement, the detection limit could be further improved to 0.1 U L−1. Moreover, the assay method could be applied for ALP detection in complex matrixes such as human serum and also for efficient inhibitor evaluation. Thus, the current study provides a new pathway to the fabrication of a coordination polymer-based electrochemical sensing platform for applications in disease diagnosis and drug discovery.
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JOURNAL OF MOLECULAR LIQUIDS
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2018
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IF 4.513
Defu Gan,Meiying Liu,Hongye Huang,Junyu Chen,Jibo Dou,Yuanqing Wen,Qiang Huang,Zhenyu Yang,Xiaoyong Zhang,Yen Wei
Since their first discovery, the carbon nanotubes (CNTs) have attracted great research attention owing to their great mechanical properties, high chemical stability, unique electronic properties and diameter ratio. The CNTs have been extensively applied as adsorbents to remove various environmental pollutants for their large surface areas. Nevertheless, the performance of pristine CNTs for removal of cationic dye methylene blue (MB) is largely limited for their poor dispersibility and lack of functional groups. In this work, the functionalized CNTs have been synthetized through the self-polymerization of tannins under alkaline solution. The obtained samples, including pristine CNTs and CNT-TA composites, were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The effects of adsorption factors, including contact time, initial MB concentration, solution pH and temperature, were scientifically investigated. Results indicate that the adsorption capacity of functionalized CNTs at room temperature could reach up to 105 mg/g, which is much higher than that of pristine CNTs in the same experimental condition. According to the results of adsorption kinetics , isotherms and thermodynamics, the adsorption of MB onto CNT-TA follows the pseudo-first-order model and Freundlich isotherm model, and the MB adsorption process is exothermic and spontaneous. These results indicate the functionalized CNTs could be applied as high-performance adsorbents with great potential of adsorbing the cationic dye pollutants from aqueous solution.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Lijin Huang,Jiayu Cai,Man He,Beibei Chen,Bin Hu
Magnetic metal–organic framework composites (MFCs) were prepared in water at room temperature through a simple, low-cost and green strategy only by employing organic salts as anionic linker sources. Amino-functionalized MFCs (MFC-N) with different amino group contents were successfully prepared by varying the ratio of disodium of 2-aminoterephthalic (NH2-Na2BDC)/terephthalic acid (Na2BDC). The prepared nanoscale MFC-N-X (X represents the percentage of NH2-Na2BDC, i.e., X = 0, 50, and 100) showed high surface area, large pore volume, excellent magnetic response, and good water and thermal stability. Among these prepared MFC-N-X, MFC-N-100 exhibited the highest adsorption capacity of 358 mg g–1 for methylene blue (MB) and 71 mg g–1 for As(V) due to its porous structure and abundant amino groups. The prepared MFC-N-100 was successfully applied to remove MB and As(V) from different water samples (tap water, lake water, and domestic sewage) with a high removal efficiency and a rapid separation of the sorbent from solution, demonstrating the great application potential of the prepared MFC-N-100 as a fascinating adsorbent for removal of dyes or metal ions from different water samples.
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