MOLECULES
·
2025
·Vol. 30
·期 7
·1413
·
IF 4.6
Tao Tang,Haoran Zhang,Hexu Wang,Xiaoyu Dou,Jianfeng Wen,Li Jiang
The development of green, efficient, and reusable photocatalysts is important for pollution degradation. In recent years, Cs3Bi2I9has been shown to be an effective photocatalyst. However, the rapid recombination of electrons and holes weakens the photocatalytic activity. In this work, the photogenerated electron transfer rate was promoted by ZIF-8 compositing with Cs3Bi2I9, which effectively improved the pollutant degradation. After 50 min of visible light irradiation, Cs3Bi2I9/ZIF-8 removed up to 98.2% of methylene blue (MB), which was 4.15 times higher than that of Cs3Bi2I9alone. In addition, the Cs3Bi2I9/ZIF-8 composite still exhibited high photocatalytic activity after three cycling experiments. Our research offers a simple and efficient method for enhancing the photocatalytic activity of lead-free halide perovskites.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2014
·
IF 1.761
Dongying Fu,Gaoyi Han,Feifei Liu,Yaoming Xiao,Hongfei Wang,Ruiqin Liu,Cuixian Liu
Composites of graphite-like C 3 N 4 (g-C 3 N 4 ) and TiO 2 were synthesized by direct heating of melamine in the presence of different TiO 2 amounts in a semi-closed stainless steel container. The resulting samples were characterized using X-ray diffraction, X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (DRS), photoluminescence spectrum (PLS), thermogravimetric analysis , scanning electron microscopy, and transmission electron microscopy techniques. The results reveal that the microstructure and DRS and PLS characteristics of the composites vary with the composition. XPS Ti 2p peaks for the composites exhibit a shift to lower binding energy in comparison to pure TiO 2 . The photocatalytic degradation properties of the composites were evaluated using methylene blue (MB) as a model compound under visible light irradiation (400–600 nm). The results indicate that photocatalytic degradation of MB is higher for g-C 3 N 4 –TiO 2 composites with optimum TiO 2 content (26.4 and 80.0 wt%) than for pure g-C 3 N 4 or TiO 2 . Moreover, the activity of an optimum composite sample was still as high as 91% after use in four consecutive photocatalytic cycles.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yijiang You,Li Liu,Guangfeng Wu
With the rapid advancement of the printing and dyeing industry, water pollution has emerged as a prominent environmental issue, particularly dye wastewater. In order to construct polymeric adsorbents with rich functional groups for efficient adsorption of dye wastewater, hydrogel spherical adsorbent SA/CMC-Kaolin was prepared by using sodium alginate (SA) as the hydrogel skeleton material, carboxymethyl cellulose (CMC) and kaolin as the strength-reinforcing materials. FT-IR, SEM, XRD, and TG were utilized for comprehensive characterization of the microbeads' characteristics and adsorption mechanism. SA/CMC-K composite microbeads were investigated for the adsorption characteristics of methylene blue (MB) in aqueous solution. Adsorption kinetics and thermodynamic models were employed to analyze the adsorption process. Under optimal conditions, SA/CMC-K microbeads demonstrated superior adsorption efficiency for MB, with a maximum adsorption capacity of 84.63 mg/g, a bio-based adsorbent with a high adsorption capacity. The adsorption process exhibited better agreement with the Langmuir isotherm equation and the pseudo-second-order kinetic model. Besides, SA/CMC-K composite microbeads maintained 71.74% adsorption efficiency after five cycles. Overall, the prepared microbeads, which are economical and environmentally friendly, are promising for the absorption of dye wastewater.
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Catalysts
·
2024
·Vol. 14
·期 10
·681
·
IF 3.8
Dezheng Li,Vilanculo Clesio Calebe,Yuqiao Li,Huimin Liu,Yiming Lei
Photocatalysis is a promising method for methylene blue (MB) degradation due to its effectiveness and environmental compatibility. Among the photocatalysts, titanium dioxide (TiO2) has been widely used for MB degradation due to its exceptional photocatalytic activity. However, the wide bandgap limits the degradation efficiency of TiO2under visible light. Here, an interstitial nitrogen-doped TiO2(5%NT/TiO2) used thiourea as the N source was fabricated for visible light-derived MB degradation. The 5%NT/TiO2exhibited an extended absorption range of visible light. Moreover, photoelectrochemical measurements showed an improvement in the photocurrent response and charge transfer behavior on N/TiO2. Thus, 5%NT/TiO2had enhanced photocatalytic activity compared with pristine TiO2and substitutive N-doped TiO2(5%NAB/TiO2). The accelerated photocatalytic MB degradation process on N/TiO2could be mainly attributed to the interstitial N doping, which caused the appearance of new energy states and extended optical properties. Through comparing the impact of interstitial and substitutive in TiO2activity, our work proposes a suitable form of element doping to enhance the optical properties and photocatalytic activity of TiO2and even other semiconductors, providing guidance for future work.
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CELLULOSE
·
2024
·Vol. 31
·期 7
·4381-4393
·
IF 4.9
Shi Xuehui,Ji Hairui,Ji Xingxiang,Tian Zhongjian,Chen Jiachuan
Heavy metal ions and dyes in wastewater pose a severe hazard to ecological system and human health. This study used sulfamic acid (SA) to modify cellulose for adsorbent material preparation. The results from the structural characterization indicated that cellulose was successfully modified by introducing sulfonic acid groups to obtain sulfamic acid modified cellulose (SAMC). Subsequently, SAMC was prepared into spheres via being dissolved in ionic liquid and obtaining in antisolvent. The adsorption performance of SAMC aerogel spheres was investigated using methylene blue (MB) and lead ions (Pb 2+ ). The maximum absorption capacity of SAMC aerogel spheres to MB and Pb 2+ achieved 14.53 mg/g and 112.15 mg/g, respectively. The adsorption process conformed to the pseudo-second-order (PSO) model and Langmuir model. The adsorption mainly involved chemical action via coordination interaction between -SO3 2− and MB/Pb 2+ . Thermodynamic experiments confirmed that the adsorption process in the experiment was a spontaneous endothermic process. Therefore, this study provided a simple adsorbent production method for wastewater treatment. Graphical abstract
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RSC Advances
·
2024
·Vol. 14
·期 33
·23606-23620
·
IF 3.9
Xinyi Yang,Jingjing Liu,Xuejin Huang,Hemin Cui,Ligang Wei,Guolin Shao,Xu Fu,Na Liu,Qingda An,Shangru Zhai
The cost-effective and green separation of dye pollutants from wastewater is of great importance in environmental remediation. Industrial seaweed residue (SR), as a low-cost cellulose source, was used to produce carboxylated nanorized-SR (NSR) via oxalic acid (OA)–water pretreatments followed by ultrasonic disintegration. Fourier transform infrared spectroscopy, X-ray polycrystalline diffraction, nitrogen isotherms, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, X-ray photoelectron spectrometry, particle charge detection, zeta potential and retro titration experiments were utilized to explore the physiochemical properties of samples. The NSRs with carboxyl content of 4.58–6.73 mmol g−1 were prepared using 10–60% OA–water pretreatment. In the case of 20% OA–water pretreatment, the highest NSR yield (73.9%) and nanocellulose content (80.2%) were obtained. Through self-assembly induced by the electrostatic interaction, magnetic NSR composite adsorbents (MNSRs) were prepared with the combination of NSR and Fe3O4 nanoparticles (NPs). The carboxylated NSR with negative charge demonstrated good affinity for Fe3O4 NPs. The Fe3O4 NPs were perfectly microencapsulated with the NSR when the NSR/Fe3O4 mass ratio was higher than 1/1. The adsorption properties of the MNSR for methylene blue (MB) removal from aqueous solution were investigated. The adsorbent with NSR/Fe3O4 mass ratio of 1/1 (MNSR1/1) exhibited optimum performance in terms of the magnetic properties and adsorption capacity. The MNSR1/1 showed high adsorption ability in a pH ≥7 environment. According to the Langmuir fitting, the maximum adsorption capacity of MNSR1/1 for MB reached 184.25 mg g−1. The adsorption of MB complies with the pseudo-second-order kinetic model. MNSR1/1 still maintained good adsorption properties after the fifth cycle of adsorption–desorption. MNSR1/1 could selectively adsorb cationic dye (i.e., MB and methyl violet) from wastewater, with hydrogen bonding and electrostatic interaction as the main force.
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International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 1
·169-181
·
IF 5.6
Li Haixu,He Haobo,Jiang Tiannan,Du Yunfei,Wu Zhichen,Xu Liang,Wang Xinjie,Liu Xiaoguang,Yu Wanhua,Xue Wendong
S and Co co-doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800°C at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate (PMS) for methylene blue (MB) degradation. The effects of two different mixing routes were identified on the MB degradation performance. Particularly, the catalyst obtained by the alcohol solvent evaporation (MOF-AEP) mixing route could degrade 95.60% MB (50 mg/L) within 4 min (degradation rate: K = 0.78 min −1 ), which was faster than that derived from the direct grinding method (MOF-DGP, 80.97%, K = 0.39 min −1 ). X-ray photoelectron spectroscopy revealed that the Co–S content of MOF-AEP (43.39at%) was less than that of MOF-DGP (54.73at%), and the proportion of C–S–C in MOF-AEP (13.56at%) was higher than that of MOF-DGP (10.67at%). Density functional theory calculations revealed that the adsorption energy of Co for PMS was −2.94 eV when sulfur was doped as C–S–C on the carbon skeleton, which was higher than that when sulfur was doped next to cobalt in the form of Co–S bond (−2.86 eV). Thus, the C–S–C sites might provide more contributions to activate PMS compared with Co–S. Furthermore, the degradation parameters, including pH and MOF-AEP dosage, were investigated. Finally, radical quenching experiments and electron paramagnetic resonance (EPR) measurements revealed that 1 O 2 might be the primary catalytic species, whereas ·O 2− might be the secondary one in degrading MB.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Zhichen Wu,Haixu Li,Huasheng Zhan,Huailiang Tian,Liang Xu,Xiaoguang Liu,Wanhua Yu
To resolve the challenges of difficult recovery and secondary pollution posed by powder catalysts in advanced oxidation processes (AOPs), cobalt/sulfur (Co/S) co-doped carbon-based powder catalysts are embedded into a composite membrane incorporating polyvinyl alcohol (PVA) and methyl cellulose (MC). The catalytic membrane is crosslinked via hydrogen bonding at an optimal PVA (10 wt% solution) to MC (2 wt% solution) volume ratio of 4:6 (P4) and cured at 130 °C. Meanwhile, P4 possessed superior methylene blue (MB) solution flux (954 L/m 2 h), swelling rate (221.9 %, 24 h), and elongation at break (2.02 %). P4 completed three filtration cycles within 10 min, achieving a MB degradation efficiency of over 99.5 %. This exceptional performance is attributed to the well-balanced hydrogen bonding crosslinking between PVA and MC in P4, which ensures uniform membrane morphology, enhanced mechanical properties, and optimal water flux. In contrast, samples with imbalanced ratios (e.g., P3 and P5) indicated that excessive PVA or MC triggered unilateral and intramolecular crosslinking (UI-crosslinking), ultimately causing non-uniform morphology, reduced mechanical strength, and diminished water flux. This work not only analyzes the effectiveness of Co/S co-doped catalytic membranes on MB degradation, but also explores the mechanism of how the PVA:MC ratio influences the membranes’ crosslinking, morphology, and mechanical properties. These findings present a promising approach for the efficient removal of organic dyes using catalytic membranes.
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ChemistrySelect
·
2025
·Vol. 10
·期 36
·e04484
·
IF 2
Xiaoqian He,Peicheng Jiang,Qilin Wang,Xinyi Luo,Shu Chen
Organic water pollution poses a global challenge. The unique properties of transition metal carbides (MXenes) make them ideal candidate adsorbents for removing water contaminants. However, limitations in the types and quantities of surface functional groups on MXenes, coupled with their inherent instability, have restricted their application in adsorbing organic dyes such as methyl blue. This study prepared sulfur–nitrogen co-doped MXenes (S─N─MX) through thermal annealing co-doping of MXenes with thiourea. This method successfully introduced sulfur and nitrogen elements as functional groups into the MXene structure, increasing the variety and quantity of surface functional groups and significantly enhancing the number of active sites. This process effectively suppresses nanolayer stacking, enhances structural stability, and substantially increases the material's adsorption capacity. Langmuir adsorption isotherm measurements reveal a maximum adsorption capacity of 239.8 mg·g −1 at 298 K and pH = 9. The material achieves efficient adsorption of methylene blue through electrostatic interactions, Lewis acid–base interactions, and hydrogen bonding. The incorporation of sulfur and nitrogen elements provides a protective effect, ensuring the composite adsorbent maintains excellent stability during adsorption–desorption cycles. After five adsorption-desorption cycles, its adsorption capacity retained over 85%. Graphical S–N co-doped MXene is synthesized via thermal annealing with thiourea, which introduces abundant surface functional groups and enhances active sites. This adsorbent exhibits a high methylene blue adsorption capacity of 239.8 mg·g - 1 through electrostatic attraction, Lewis acid–base interaction, and hydrogen bonding. It also demonstrates excellent recyclability, retaining over 85% efficiency after five cycles.
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Catalysts
·
2025
·Vol. 15
·期 12
·1158
·
IF 4
Li Ma,Kun Zhang,Feilong Guo,Tiejun Kuang
This study systematically investigates the catalytic degradation performance and reaction mechanism of Fe80P13C7Metal Glass (MG) in a Fenton-like system for the removal of Methylene Blue (MB). Kinetic experiments on degradation reveal that under acidic conditions (pH = 3), Fe80P13C7MG exhibits exceptional catalytic activity, achieving complete degradation of a 50 mg/L MB solution within 12 min. Its degradation rate significantly surpasses that of Fe78Si9B13MG and commercially available ZVI powder. Key parameters such as catalyst dosage, H2O2concentration, solution pH, and initial dye concentration were systematically examined to determine the optimal reaction conditions. The characterization results indicate that Fe80P13C7MG maintains high activity even after multiple cycles of use, attributed to surface selective corrosion and crack formation during the reaction process. This “self-renewal” mechanism continuously exposes fresh active sites. Mechanistic studies confirm that the degradation process is driven by an efficient redox cycle between Fe2+/Fe3+within the material, ensuring sustained and stable generation of •OH, which ultimately leads to the complete mineralization of MB molecules. This research provides solid experimental and theoretical foundations for the application of Fe80P13C7MG in dye wastewater treatment.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jianyao Liu,Shuo Wang,Huiling Chen,Xinlai Zhou,Dongju Chen,Zhizhang Yuan,Xianfeng Li
Polyvinylidene fluoride (PVDF) membranes are widely used in energy-related devices, such as flow batteries and osmotic energy capture. However, most PVDF-based membranes are intrinsically hydrophobic, which leads to a low conductivity. Here, we use a moderate strategy to graft hydrophilic sodium p-styrenesulfonate (NaSS) in PVDF membranes from the surface into the interior, enabling ion-accessible regions to form within the membranes. By creating and optimizing nanoscale pores in PVDF membranes to allow NaSS and redox mediation systems to diffuse into the membrane, the grafting reaction between NaSS and PVDF from outside to inside can be realized at temperate temperatures (35 °C–45 °C), which favors maintaining membrane stability. Through adjustment to the grafting degree, we can tailor the ion transport channels to obtain membranes with different conductivities. Using the methylene blue (MB)–vanadium flow battery for exemplification, our membranes enable the battery to afford a Coulombic efficiency of 99.94% and a voltage efficiency of 87.55% at a current density of 40 mA cm–2, which is significantly higher than that of the battery using a Nafion 212 membrane (CE ∼ 99.74%, VE ∼ 75.08%). Our strategy is simple and moderate and provides an efficient way to create hydrophilic ion transport channels within hydrophobic membranes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yufen Gu,Bobo Guo,Zao Yi,Xianwen Wu,Jiao Zhang,Hua Yang
One decisive factor for the photocatalytic performance of ZnSn(OH) 6 (ZSO) is nanoparticle morphology. However, the mechanism of the well-defined morphology preparation remains unknown, which leads to the systematic investigation of various parameters in the hydrothermal method . Here, shell-like hollow Archimedean ZSO nanocubes were prepared by a hydrothermal method under suitable conditions, with a uniform particle size distribution and superior dispersion. The effects of hydrothermal time, temperature, pH and surfactant on the microscopic morphology and photocatalytic degradation of methylene blue (MB) dye were investigated. The enhanced photodegradation efficiencies ( η ) of MB were 97.7%, 96.3%, 89.6%, and 96.2% for 8 h-ZSO, 120 ℃-ZSO, 2.85-ZSO, and Hexadecyl trimethyl ammonium Bromide-ZSO (CTAB-ZSO), respectively, which strongly depended on the morphology, leading to differences in physicochemical properties, such as bandgap and charge transfer resistance. The results suggested that a single change in hydrothermal time, temperature, pH, or surfactant can effectively improve the microscopic morphology and photocatalytic performance of ZSO, which may pave the way for the ingenious design of other high-performance photocatalysts . A growth mechanism was proposed for shell-like hollow ZSO prepared in an alkaline environment.
研究领域:
材料科学
·
环境科学
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