JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 15
·1145
·
IF 3.2
Mao Tan,Wang Wei,Liu Peilong,Zha Junyan,Bu Xiran,Song Rui,Luo Xueke
To overcome the intrinsic limitations of TiO 2 , specifically its wide band gap and rapid photogenerated carrier recombination, for dyeing wastewater treatment, a Yb 3+ /Er 3+ co-doped TiO 2 -ZnO heterostructure was fabricated by sol–gel method. X-ray diffraction revealed inhibited anatase-to-rutile phase transition. X-ray photoelectron spectroscopy confirmed Ti 2p binding energy shifts, indicating strong electronic interactions between dopants and the host lattice. Ultraviolet–visible diffuse reflectance spectroscopy showed band gap narrowing to 2.927 eV, with upconversion effect extending light absorption to the near-infrared region. Photoluminescence measurements demonstrated suppressed carrier recombination, and XPS confirmed abundant oxygen vacancies. The optimal sample achieved 74.31% methylene blue degradation under visible light for 6 h and 98.58% under ultraviolet light for 2 h, outperforming commercial P25. The Yb 3+ /Er 3+ co-dopants serve dual functions: they act as upconversion centers to harvest low-energy photons and function as electronic modulators that induce Ti 2p binding energy shifts and create oxygen vacancies, thereby enhancing charge separation and surface reactivity. This work integrates rare-earth co-doping with heterojunction engineering to boost TiO 2 photocatalysis.
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LANGMUIR
·
2026
·
IF 4.4
Li Xuejiao,Sun Yue,Shi Yu,Zhou Shangfeng,Wu Kejia,Li Bo,Tan Xiaoyu,Xu Huanyan,Shan Lianwei
Defect
engineering, particularly the creation of oxygen vacancies
(Ovs), has emerged as a transformative strategy for enhancing the
photocatalytic efficacy of metal oxides. Herein, we report petal-like
MoO 3– x nanostructures engineered
with abundant Ovs via a precisely controlled solvothermal method.
Compared with previously reported MoO 3 photocatalysts,
the engineered Ovs significantly narrow the bandgap from 3.12 to 3.02
eV, endowing the material with exceptional visible-light absorption
capacity. Under visible-light irradiation, the samples exhibit a 2.68-fold
higher degradation efficiency toward methylene blue (MB), achieving
98.85% removal within 240 min. Reaction kinetics and radical trapping
experiments collectively demonstrate that pollutant degradation proceeds
via a synergistic mechanism involving efficient adsorption and oxidative
pathways dominated by photogenerated holes (h + ) and hydroxyl
radicals (•OH). Moreover, the as-prepared MoO 3– x also exhibits favorable photocatalytic activities
toward tetracycline hydrochloride (TCH) degradation and Cr(VI) reduction,
demonstrating its broad-spectrum application potential for environmental
remediation. Mechanistic insights reveal that the introduced Ovs in
MoO 3– x nanosheets function synergistically
in three key aspects: broadening visible-light harvesting, acting
as electron traps to inhibit carrier recombination, and promoting
substrate adsorption. This work elucidates the integrated functions
of Ovs in modulating electronic structure and interfacial processes,
offering a transferable design strategy for developing advanced photocatalytic
materials.
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COLLOID AND POLYMER SCIENCE
·
2026
·
IF 2.9
Jv Xiaoxuan,Liu Xiangchi,Liu Ailing,Liu Baijun,Zhang Mingyao
In response to the escalating global water pollution problem, a three-dimensional crosslinked poly(acrylic acid-acrylamide-sodium styrene sulfonate)/chitosan (P(AA-AM-SSS)/CTS) composite superabsorbent resin was successfully synthesized via inverse suspension polymerization. A series of systematic experiments were performed to elucidate the effects of initiator dosage, crosslinker content, and monomer composition on the network structure, swelling behavior, and adsorption performance. Through controlled optimization of the polymerization conditions, a structurally stable three-dimensional polymer network was established. Under optimized conditions, the composite resin exhibited a high swelling capacity of 1233.7 g/g in deionized water and 137.3 g/g in saline solution, demonstrating effective enhancement of both water absorbency and salt tolerance. Meanwhile, the material maintained favorable water retention at 60 °C, achieving a water retention rate of approximately 85%, and displays outstanding reswelling capability. Thermogravimetric analysis revealed a residual mass of 42.9% at 600 °C, indicating enhanced thermal stability. In addition, adsorption experiments toward the cationic dye methylene blue were systematically conducted under varying adsorbent dosage, contact time, temperature, and initial dye concentration. The optimized composite achieved a maximum adsorption capacity of 874.6 mg/g under the studied conditions. Therefore, the incorporation of SSS and CTS into the superabsorbent resin network contributes to the improvement of water absorbency, salt tolerance, water retention, and dye adsorption performance, indicating the potential applicability of the composite in wastewater treatment. Graphical The alternative text for this image may have been generated using AI.
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Scientific Reports
·
2022
·Vol. 12
·期 1
·1-16
·
IF 4.996
Gomaa Hassanien,Abd El-Monaem Eman M.,Eltaweil Abdelazeem S.,Omer Ahmed M.
The jeopardy of the synthetic dyes effluents on human health and the environment has swiftly aggravated, threatening human survival. Hence, sustained studies have figured out the most acceptable way to eliminate this poisonous contaminant. Thereby, our investigation aimed to fabricate montmorillonite/magnetic NiFe 2 O 4 @amine-functionalized chitosan (MMT-mAmCs) composite as a promising green adsorbent to remove the cationic methylene blue (MB) and crystal violet (CV) dyes from the wastewater in neutral conditions. Interestingly, MMT-mAmCs composite carries high negative charges at a wide pH range from 4 to 11 as clarified from zeta potential measurements, asserting its suitability to adsorb the cationic contaminants. In addition, the experimental study confirmed that the optimum pH to adsorb both MB and CV was pH 7, inferring the ability of MMT-mAmCs to adsorb both cationic dyes in simple process conditions. Furthermore, the ferromagnetic behavior of the MMT-mAmCs composite is additional merit to our adsorbent that provides facile, fast, and flawless separation. Notably, the as-fabricated composite revealed an auspicious adsorbability towards the adsorptive removal of MB and CV, since the maximum adsorption capacity of MB and CV were 137 and 118 mg/g, respectively. Moreover, the isotherm and kinetic investigatins depicted that the adsorption of both cationic dyes fitted Langmuir and Pseudo 2nd order models, respectively. Besides, the advanced adsorbent preserved satisfactory adsorption characteristics with maximal removal efficacy exceeding 87% after reuse for ten consecutive cycles. More importantly, MMT-mAmCs efficiently adsorbed MB and CV from real agricultural water, Nile river water and wastewater samples at the neutral pH medium, reflecting its potentiality to be a superb reusable candidate for adsorptive removal cationic pollutants from their aquatic media.
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PubMed
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Cheng Wang,Jiale Yu,Kai Feng,Lipeng Wang,Jianfeng Huang
In this study, the natural clinoptilolite zeolite was hydrothermally treated and then combined with porous silica-coated magnetic particles to prepare a porous magnetic zeolite-based material. Process parameters such as NaOH concentration, hydrothermal temperature and time, pH value, and Fe 3 O 4 /Na 2 SiO 3 ratio were optimized. XRD , XPS, N 2 adsorption-desorption technique, SEM-EDX, TEM, FTIR, etc. were employed to investigate the composition and structure of the materials. Cd 2+ ion and methylene blue were adopted to evaluate the contamination removal performance of the materials. The results showed that hydrothermal treatment under an alkaline environment could transform clinoptilolite to Na–P zeolite with a low Si/Al ratio and relatively high Cd 2+ adsorption capacity. Porous silica-coated magnetite loading could significantly increase the specific surface area of the material and render it magnetic. The as-prepared porous magnetic zeolite-based material exhibited much higher Cd 2+ ion and methylene blue removal performance than the raw natural clinoptilolite zeolite.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Minling Ding,Tongtong Hou,Huizhe Niu,Nan Zhang,Ping Guan,Xiaoling Hu
In this paper, a sensing platform for the electrocatalytic oxidation of nicotinamide adenine dinucleotide (NADH) was proposed. It was prepared by the electropolymerization of poly(thionine-methylene blue) (PTH-MB) in ternary nature deep eutectic solvent (NADES) on a glassy carbon electrode (GCE) that was modified with electrochemically reduced graphene oxide (ERG). The modified electrode was denoted as PTH-MB NADES -ERG/GCE. Cyclic voltammetry (CV), chronocoulometry (CC), electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), Raman spectroscopy, and Ultra Violet-Visible Spectroscopy (UV–Vis) were used to characterize the preparation processes. The electrochemical performances of the electrode in NADH oxidation were studied via CV and current-time methods. The NADH oxidation overpotential was lower on PTH-MB NADES -ERG/GCE compared to that on GCE, ERG/GCE, and PTH-MB NADES /GCE. The PTH-MB NADES -ERG/GCE showed excellent electrocatalytic activity for NADH oxidation with a linear range of 0.51–3333.33 µM (R 2 = 0.9534) and a detection limit of 0.159 nM. The sensor was further tested for NADH determination in artificial urine samples, showing promising biomedical applications.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Qiang Chen,Hong Wang,Xiaodong Tang,Zihan Ba,Xiaoqiang Zhao,Yi Wang,Hong Deng
Pristine CNTs always suffer from a slow adsorption rate or low adsorption capacity. Development of CNT-based adsorbents is highly desirable to improve their adsorption performance. In this study, novel carbon quantum dot-carbon nanotube composite (CQD-CNT) adsorbents and defective CNTs were synthesized for the first time by one-step chemical vapor deposition using catalysts derived from waste eggshells. The coverage of CQDs on CNTs endowed CQD-CNT with a larger surface area (324.4 m 3 /g), more abundant pore structures and surface functional groups compared to defective CNTs. The adsorption of methylene blue (MB) on CQD-CNT was systematically studied, and CQD-CNT demonstrated good adsorption capacity and extremely fast adsorption rate for MB at a wide pH range (2–12) and different temperatures (293–313 K). A high removal efficiency of 99.5% was achieved in 5 min, and the maximum adsorption capacity was 299.4 mg/g, which was 1.3 and 4.6 times higher than that of defective CNTs and pristine CNTs, respectively. The adsorption results were closely fitted by Langmuir isotherm model and pseudo-first-order kinetic model. The adsorption of MB on CQD-CNT involved multiple adsorption mechanisms, including electrostatic interactions, hydrogen bonding, π-π stacking interaction and pore filling. In addition, CQD-CNT showed good reusability and stability, retaining a removal efficiency of 95.1% after 5 cycles. Finally, high decolorization rates (98.6–100%) were obtained using CQD-CNT in the treatment of simulated textile wastewater. These results demonstrate that CQD-CNT benefitted from one-step green synthesis and the effective utilization of waste eggshells has potential applications in wastewater treatment .
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ACS Omega
·
2021
·
IF 3.512
Abdelazeem S. Eltaweil,Injy M. Mamdouh,Eman M. Abd El-Monaem,Gehan M. El-Subruiti
Herein, we report a new metal–organic framework (MOF)-based composite beads adsorbent made via incorporating UiO-66 MOF, carboxylated graphene oxide (GOCOOH) into sodium alginate for efficient removal of methylene blue dye, and Cu2+ ions. The successful fabrication of the synthesized UiO-66/GOCOOH@SA composite beads was confirmed by means of X-ray diffraction, Fourier transform infrared, scanning electron microscopy, zeta potential, X-ray photoelectron spectroscopy analysis, and thermogravimetric analysis and BET measurement. The incorporation of both UiO-66 and GOCOOH into SA beads greatly increased their adsorption efficiency for the removal of both MB and Cu2+ with maximum adsorption capacities of 490.72 and 343.49 mg/g, respectively. The removal process of both MB and Cu2+ follows the pseudo-second-order model and Freundlich isotherm model. A plausible adsorption mechanism was discussed in detail. Regeneration tests clarified that the removal efficiencies toward both MB and Cu2+ remained higher than 87% after five cycles. These results reveal the potentiality of UiO-66/GOCOOH@SA beads as an excellent adsorbent.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 12
·5605-5620
·
IF 3.591
Yuhua Niu,Xingxing Han,Jie Song,Liangxian Huang
Novel magnetic gel beads were successfully fabricated via a polyvinyl alcohol (PVA) and sodium alginate (SA) double-cross-linked network and loaded with ferroferric oxide@potassium humate (Fe3O4@KHA) nanoparticles. The PVA/SA/Fe3O4@KHA gel beads were found to exhibit an excellent removal efficiency for methylene blue (MB) dye and Pb(II). The physicochemical properties of these gel beads were systematically characterized using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, zeta analysis, Brunauer–Emmett–Teller analysis and vibrating sample magnetometry. The adsorption process was found to follow a pseudo-second-order kinetic model and the experimental data were in good agreement with the Langmuir model, with maximum adsorption capacity values of 781.92 and 347.19 mg g−1 for MB and Pb(II) at 298 K, respectively. The thermodynamic measurements demonstrate that adsorption onto these gel beads was spontaneous, endothermic, and driven by an increase in the system entropy. Furthermore, FT-IR and X-ray spectroscopy investigations demonstrate that the mechanism through which Pb(II) was removed mainly involved chelation by the carboxyl groups, whereas MB adsorption takes place via H-bonding and electrostatic interactions. Notably, PVA/SA/Fe3O4@KHA showed high selectivity for MB adsorption. Additionally, the prepared magnetic gel beads could be readily regenerated and efficiently reused for several cycles and their excellent magnetic properties can simplify the adsorbent separation process.
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ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Li-Wang Jiang,Feng-Tao Zeng,Yi Zhang,Meng-Ya Xu,Ze-Wu Xie,Hua-Ying Wang,Ying-Xuan Wu,Fu-An He,Hong-Liu Jiang
A novel composite basing on the Fe 3 O 4 nanoparticle, the graphite oxide nanosheet (GON), and the citric acid-crosslinked β-cyclodextrin polymer (CA-CDP) was prepared for the purpose of removing the methylene blue (MB) dye from water. The structure of the resultant Fe 3 O 4 /GON/CA-CDP composite was investigated by the scanning electron microscope, the two dimensional EDS mapping, the thermal gravimetric analyzer, the Fourier transform infrared spectroscope, the wide angle X-ray diffraction, the X-ray photoelectron spectroscope, and the zeta potential measurement. The Fe 3 O 4 /GON/CA-CDP composite not only had a good MB adsorption capacity of 173 mg/g but also a high saturation magnetization of 36.4 emu/g. It was found that the MB adsorption capacity of the Fe 3 O 4 /GON/CA-CDP composite increased with the increasing initial MB solution pH value especially in the low-pH-value range. Moreover, the MB adsorption mechanism, the MB adsorption isotherm, and the MB adsorption kinetic of the Fe 3 O 4 /GON/CA-CDP composite were investigated. It was found that 1) the good adsorption ability of the Fe 3 O 4 /GON/CA-CDP composite for the MB dye originated from the electrostatic attraction, the Lewis acid-Lewis base interaction, the host-guest supramolecular interaction and the π-π interaction, and 2) the MB adsorption isotherm and the MB adsorption kinetic of the Fe 3 O 4 /GON/CA-CDP composite could be well explained by the Sips model and the intraparticle diffusion model, correspondingly.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·665-674
·
IF 2.659
Yating Liu,Ming Li,Qingyan Zhang,Picai Qin,Xiandong Wang,Guannan He,Ling Li
BACKGROUND The photocatalytic activity of a pristine semiconductor is unsatisfactory due to the rapid recombination of photogenerated electrons and holes. Constructing composite photocatalysts has proven to be an effective method to suppress electron–hole recombination. The composites composed of two materials usually are synthesized through a two-step process. However, in this work, a simple one-step solvothermal method employing an homogeneous reaction system was adopted to synthesize a tungsten trioxide (WO 3 )-copper sulfide (CuS) nanosheet heterojunction with enhanced photocatalytic properties. RESULTS The formation of the WO 3 -CuS heterojunction was confirmed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray and X-ray photoelectron spectroscopy analysis. The composites showed improved visible light harvesting ability, and enhanced photoelectric and photocatalytic properties compared with pure WO 3 . The optimized composite displayed a photocurrent almost five-fold greater than the sum of the photocurrents of WO 3 and CuS, and had superior performance for methylene blue (MB) degradation and hexavalent chromium [Cr(VI)] reduction. The MB degradation and Cr(VI) reduction efficiencies were both improved when they co-existed in the photocatalytic system. Interferential ions Cl − and NO 3 − were much less effective in the degradation of MB than in the reduction of Cr(VI). CONCLUSIONS Improved photocatalytic activity was achieved after coupling CuS with WO 3 , due to the enhanced visible light absorption and efficient electron–hole separation. Photogenerated holes were found to be the dominant reactive species in the MB photodegradation process. A synergistic effect existed between MB degradation and Cr(VI) reduction. Interferential ions Cl − and NO 3 − had much greater effect on Cr(VI) reduction than MB degradation. © 2019 Society of Chemical Industry
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Mingxia Tian,Guyu Zhang,Xinlei Zhao,Yumin Yan,Jianbo Zhao,Hui Bai,Jianhui Jiang
Herein, Nd-ZnO/g-C 3 N 4 (NZCN) composites were obtained by doping rare-earth element Nd with ZnO using a hydrothermal method , coupled with g-C 3 N 4 (CN) electrostatic ultrasonic self-assembly. The NZCN composite exhibited an impressive methylene blue (MB) removal rate of 94.88 %, with a degradation rate of 0.02637 min −1 after 105 min exposure to 500 W xenon lamp irradiations. Comparatively, the degradation rate of MB by the NZCN composite was five and twice times higher than ZnO and CN samples, respectively. This significant improvement can be attributed to the synergistic effect of Nd, ZnO, and CN, which not only widened the light absorption range but also enhanced the density, separation, and transport of photogenerated electrons (e − ) and holes (h + ), thus improving the photocatalytic performance of the NZCN composites. An in-depth investigation into the photocatalytic reaction process was carried out using free-radical active-species capture experiments, confirming the critical role of h + . Furthermore, the reproducibility and stability of the NZCN composites were assessed over five experimental cycles, demonstrating consistent and stable MB degradation rates of 90.1 % while retaining the crystal structure unchanged. Overall, the construction of rare-earth-metal-doped ZnO and Z-type heterojunctions synergistically improves photocatalytic activity and provides a green and environmentally friendly approach for the removal of organics from wastewater.
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