INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2026
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IF 8.7
Jitao Huang,Xuemei Li,Chi Zhang,Xinyi Yang,Hao Xie,Changchun Li,Bo Xiong,Jianying Yu,Bianyang He,Lei Zhu
Lignin (LG) is widely incorporated into chitosan (CS) via physical blending to increase adsorption sites and thereby enhance dye removal. However, chemical grafting of LG onto CS has received limited attention due to persistent doubts about its superiority over physical blending and unclear the synergistic mechanism. Herein, we demonstrate a diisocyanate-mediated strategy to graft LG onto CS for enhancing the adsorption capacity of methylene blue (MB) by hyperconjugation-driven: the synergistic effects of expanded adsorption sites, strengthened binding affinity, and establishment of a benzene-dominated σ → π ⁎ hyperconjugation system. Specifically, LG-diisocyanate-CS (LG-D-CS) composites were successfully formed via covalent bonding with three different diisocyanates, which exhibited improved dispersion and hydrophobicity owing to the introduction of lipophilic groups compared to CS. Subsequently, LG-diphenylmethane diisocyanate-CS (LG-M-CS) was then evaluated for MB adsorption. Comprehensive isotherm, kinetic, and thermodynamic analyses confirmed that LG-M-CS (132.279 mg/g) showed four-fold boost in adsorption capacity than CS (32.514 mg/g). Furthermore, molecular simulations (MS) were performed to elucidate the adsorption mechanism, encompassing HOMO-LUMO energy gaps, molecular electrostatic potentials (MEP), Bond dissociation energy (BDE), binding energies, mean square displacements (MSD) and radial distribution functions (RDF). The results revealed benzene-rich LG and MDI segments dramatically proposed more adsorption sites, stronger intrinsic affinity, enhanced electron-donating capability and intensified π-cation interactions, providing the microscopic evidence of this electronic effect in bio-based adsorbents. This finding establishes hyperconjugation as a powerful new design principle for dramatically boosting the dye removal performance of renewable polysaccharide adsorbents.
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Materials
·
2026
·Vol. 19
·期 5
·845
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IF 3.7
Hongfei Wu,Yanlong Gao,Senwei Wu,Xiujian Zhao,Yi Xie,Shouqin Tian
Organic dye pollution in industrial wastewater poses a serious environmental challenge, with methylene blue (MB) serving as a typical persistent pollutant due to its stable chemical structure, recalcitrance to degradation, and eco-toxicity. Conventional physical, chemical, and biological treatment methods suffer from limitations such as insufficient efficiency, high cost, or the tendency to generate secondary pollution. Based on green and sustainable photocatalysis technology, this study designed and prepared a NiO/SrTiO3p-n heterojunction photocatalysts, aiming to broaden the light-response range and enhance charge-carrier separation efficiency. The optimal sample (NiO (10%)/SrTiO3) achieved complete photocatalytic degradation of MB within 9 min, with an apparent rate constant 34.6 times that of pure SrTiO3. It also showed good cyclic stability. Trapping experiments confirmed that •OH and •O2−were the key active species in the degradation process. Combined with band structure and PL analyses, an S-scheme charge-transfer mechanism was proposed, clarifying the critical role of the built-in electric field at the heterojunction interface in promoting carrier separation while maintaining high redox capability. This work not only provides a new pathway for developing efficient and stable SrTiO3-based photocatalysts but also offers theoretical and experimental support for the practical application of p-n heterojunction photocatalysts in environmental pollution control.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Yafang Li,Tao Tian,Zijie Zhang,Zhihao Li,Le Tian,Yinong Sun,Yixia Zhao,Jingge Ju
The porous alumina‑carbon composite fibers (PACF) were innovatively prepared through the implementation of an coaxial electro-blown spinning (EBS) method in conjunction with carbonization process. This study pioneers a strategy where a carbon precursor core is encapsulated by an alumina precursor shell, co-incorporating PTFE as a porogen. This design yields a continuous porous carbon network within the alumina fiber, serving as a skeleton to ensure mechanical integrity and inhibit brittleness, while component diffusion enables surface carbon exposure for rapid adsorption. The optimal PACF (prepared at an inner-outer flow rate of 1:2, 3 °C/min, 800 °C) possesses a hierarchical pore structure, a high specific surface area (349 m 2 /g), and exhibits exceptional methylene blue adsorption performance (99% removal in 2.5 min) with excellent reusability (maintained a high adsorption efficiency of 95.5% even after five adsorption–desorption cycles). The superior adsorption performance of PACF originates from its hierarchical pore architecture formed by porous carbon and alumina, where carbon-derived micropores supply abundant adsorption sites and alumina-derived mesopores serve as efficient diffusion channels. This multiscale pore synergy reduces mass-transfer resistance and promotes methylene blue diffusion and accumulation within the fibers, enabling rapid and efficient adsorption. The synergistic effect between porous alumina and carbon endows the PACF with superior comprehensive performance, highlighting its potential for practical wastewater treatment applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2026
·
IF 8.7
Yuxuan Guo,Yueyuan Xu,Yueqi Zhou,Canming Hu,Chengli Ding,Abulikemu Abulizi
The use of photogenerated carriers to regulate interfacial photo-redox reactions and improve the efficiency of photocatalytic applications has become a hot topic in photocatalyst research. We proposed a novel strategy, which enables efficient charge separation by uniformly deposition CuS/Bi₂S₃ nanoparticles on three-dimensional porous cellulose-derived carbon aerogel (CA), and utilizes highly active holes excited by ultraviolet-visible light to drive surface reactions, demonstrating excellent performance in the photo-oxidative degradation of methylene blue (MB) organic pollutants. The samples were characterized and structurally tested using techniques such as X-ray fluorescence spectroscopy, X-ray diffraction analysis, scanning electron microscopy, and a BET specific surface area analyzer. Under visible light irradiation, the composite material demonstrated remarkable degradation efficiency for methylene blue, achieving 98.98% removal within 80 min while maintaining over 87.48% of its initial activity after five consecutive reaction cycles. The enhanced photocatalytic performance is attributed to the fact that the carbon aerogel matrix provides a 3D framework with high surface area to effectively disperse catalyst nanoparticles and organic dye molecules near the active site, its conductive network facilitates efficient electron transport, and the porous structure can optimally separate photogenerated electron-hole pairs by enhancing light absorption through internal scattering mechanisms. We identified that superoxide anions (·O₂ − ) and hydroxyl radicals (·OH) act as the primary active species in the degradation process through radical trapping experiments. This study not only presents a high-performance, environmentally friendly catalyst for wastewater treatment but also offers valuable design principles for developing biomass carbon-based photocatalytic systems with S-scheme heterojunctions.
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NEW JOURNAL OF CHEMISTRY
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2026
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IF 2.6
Yinli Liu,Junjie Yang,Qianyi Yang,Xiao-Gang Yang
β-Cyclodextrin/phosphazene microparticles bearing amidoxime groups (β-CDPO) were synthesized by first crosslinking β-CD with hexachlorocyclotriphosphazene (HCCP) and 2,3-diaminomaleonitrile (DAMN), followed by conversion of the nitrile groups using hydroxylamine hydrochloride. The submicron adsorbent combines a phosphazene network, β-CD inclusion cavities, and amidoxime-rich hydrophilic interfaces, facilitating the swift and selective extraction of cationic methylene blue (MB). Over 98% of MB was eliminated in under 1 minute, achieving adsorption equilibrium within 10 minutes. The β-CDPO-2 showed excellent MB uptake, and Langmuir fitting suggested a high theoretical adsorption capacity under the tested isotherm conditions. The exceptional performance is due to the synergy of negative surface charge, numerous amidoxime, hydroxyl, and phosphazene-derived interaction sites, enhanced wettability, submicron size, and β-CD host–guest inclusion. In an MB/CR mixed-dye system, β-CDPO-2 preferentially captured MB over CR, suggesting potential charge-selective adsorption under the tested conditions. β-CDPO also exhibited antibacterial inhibition rates close to 100% against E. coli and above 90% against S. aureus. After 10 adsorption–desorption cycles, β-CDPO-2 maintained stable MB removal performance. These results demonstrate that β-CDPO is a multifunctional β-CD-based adsorbent with potential for rapid dye removal, model charge-selective adsorption, and antibacterial water purification.
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NEW JOURNAL OF CHEMISTRY
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2026
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IF 2.6
Bin Luo,Jing Xu,Yingying Liu,Ru-An Chi,Junxia Yu,Qingbiao Zhao
The discharge of wastewater containing organic dye pollutants exacerbates contamination in natural water bodies. In this study, a porous three-dimensional (3D) graphene oxide/citric acid/sodium alginate (GO/CA/SA) aerogel microsphere was prepared via a cross-linking and freeze-drying method using graphene oxide (GO), citric acid (CA), and sodium alginate (SA) as raw materials, and applied for the adsorption of methylene blue (MB). The GO/CA/SA aerogel beads were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), scanning electron microscopy (SEM), Zeta potential, energy dispersive spectroscopy (EDS), and X ray photoelectron spectroscopy (XPS). Adsorption experiments revealed that the adsorption capacity of GO/CA/SA for MB reached a very high capacity of 994 mg/g. The adsorption behavior conformed to the Langmuir isotherm model and the pseudo-second-order kinetic model. Combined with thermodynamic parameters, the adsorption process was identified as a spontaneous exothermic reaction dominated by chemisorption. Further analysis by XPS, FT-IR, and zeta potential confirmed that the adsorption mechanism of MB onto GO/CA/SA consists of hydrogen bonding, π–π interaction, and electrostatic force. Moreover, in the presence of the anionic dye methyl orange (MO), the neutral dye rhodamine B (RhB), and humic acid (HA), GO/CA/SA maintained good adsorption performance and selectivity toward MB. Additionally, with ethanol desorption, GO/CA/SA can be reused for five adsorption–desorption cycles with MB removal over 90%. GO/CA/SA aerogel beads demonstrate high potential as an efficient adsorbent for the removal of MB from wastewater.
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CERAMICS INTERNATIONAL
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2025
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IF 5.6
Nguyen Thi Ngoc Yen,Vuong Thanh Tuyen,Cao Thi My Dung,Le Thuy Thanh Giang,Tran T.T. Van
The degradation of persistent organic dyes, such as methylene blue (MB), is crucial for protecting aquatic environments, as these compounds are chemically stable and resistant to conventional treatment methods. The TiO 2 -based photocatalysts have been widely explored for pollutant degradation owing to their chemical robustness, eco-friendliness, and strong oxidative capability under light irradiation. However, its wide bandgap (∼3.0–3.2 eV) restricts optical absorption to the ultraviolet region, which comprises only a small portion, less than 5 % of solar energy. In this work, a UCNRs@TiO 2 core–shell nanostructured photocatalyst composed of NaYF 4 :30 Yb 3+ ,0.5 Tm 3+ upconversion nanorods (UCNRs) and TiO 2 nanoparticles was successfully fabricated to enhance both ultraviolet (UV) and near infrared (NIR)-responsive photocatalytic activity. The UCNRs serve as efficient optical converters, absorbing near-infrared light at 980 nm and emitting UV photons to activate TiO 2 , thereby extending its operational spectral range. Photocatalytic activity was evaluated under solar simulated irradiation by monitoring the degradation of MB at a concentration of 15 mg/L. The UCNRs@TiO 2 photocatalyst achieved a remarkable degradation efficiency of 100 % MB within 90 min with an apparent rate constant of 0.063 min −1 , in contrast to 195 min required by bare TiO 2 . In addition, the photocatalytic enhancement mechanism of UCNRs@TiO 2 materials was also proposed based on the results of Photoluminescence, UV–Vis spectra and LC-MS. The excellent stability of the composites after three cycles of reuse demonstrates their promise for the rational design of NIR-driven photocatalysts for sustainable wastewater treatment.
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Sustainable Materials and Technologies
·
2026
·
IF 9.7
Wenjuan Zhang,Zhongliang Li,Yezhi Ding,Panpan Zhang,Yongqiang Wan,Qiaohong Zhang,Jinyuan Ma,Youliang Wang
The development of iron-based heterogeneous Fenton catalysts is often hindered by challenges including slow Fe 3+ /Fe 2+ cycling, limited interfacial electron transfer kinetics, and inefficient mass transport, leading to suboptimal catalytic efficiency. In this work, three distinct assembly strategies—hydrogen bonding, electrostatic self-assembly, and solvothermal methods—were utilized to fabricate MCuFe-MOF/PMMA@MXene (denoted as MPM) microspheres for the photo-Fenton degradation of methylene blue (MB). Notably, the microspheres fabricated via electrostatic self-assembly (designated E -MPM) exhibited a unique three-dimensional (3D) microsphere architecture. This structure significantly enhanced the adsorption capacity for pollutants and improved mass transfer, concurrently broadening the visible-light absorption range. The well-defined interfaces within the E -MPM microspheres facilitate the formation of multiple heterojunctions with favorable band alignment, which effectively promotes the generation and separation of photogenerated electron-hole pairs. Consequently, highly reactive free radicals are efficiently generated through the photo-Fenton process, the E -MPM microspheres demonstrated high catalytic activity, achieving a remarkable MB degradation efficiency of approximately 91.9% within 60 min at 4 g/L MB under visible-light irradiation. This study not only provides a fundamental insight into the design of bimetallic MOF/MXene-derived heterogeneous photocatalysts, but also broadens the application scope of MXene-based materials in advanced water treatment technologies.
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FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2024
·
IF 2.1
Yufei Zhang,Sile Liu,Chuan Tian,Peng Xu,Xinzhong Deng,Congna Lv
To solve the pollution of natural water bodies by organic dyes and the exceeding of indoor HCHO standards caused by renovation, the study realized the band gap modulation of g-C3N5, a novel semiconductor photocatalytic material, by using H3BO3 as a source of nonmetallic B. The prepared B/g-C3N5 has shown excellent photocatalytic performance and stability for organic dye degradation in water bodies and indoor HCHO removal. The degradation rate of methylene blue (MB) reached 95% in 60 min of visible light, and the removal rate of HCHO reached 96.3% in 180 min of visible light. The MB and HCHO were efficiently degraded to small molecule inorganic compounds such as CO2 and H2O under the oxidation of active groups such as ·O2− and h+. The doping of nonmetallic B realizes the efficient separation of e−-h+ of g-C3N5, improve the absorption performance of visible light, and broaden the spectral range significantly. The modulation of the g-C3N5 band gap provides a potential application scenario for the development of novel photocatalytic materials.
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INDUSTRIAL CROPS AND PRODUCTS
·
2026
·
IF 6.2
Huiting Li,Yiyi Yuan,Chenjia Ma,Kun Yu,Bing Li,Jianzhong Guo
To develop an efficient and green adsorbent for cationic dye removal, a one-step method was developed to prepare the IFPHC adsorbent, involving the solvent-free radical copolymerization of itaconic acid with a bamboo/PVC co-hydrothermal carbon. The reaction was initiated by ammonium persulfate under alkaline conditions. The performance of the resulting IFPHC was assessed for its efficacy in removing methylene blue (MB) from water, demonstrating a high adsorption capacity. Characterization results from Zeta potential, BET, FTIR, XPS, and SEM demonstrated a high density of carboxylate functional groups on the material, accounting for its high affinity for cationic pollutants. As determined by the Langmuir model, IFPHC exhibited a maximum MB adsorption capacity of 613.94 mg·g⁻¹ at 298 K. The adsorption behavior was accurately captured by the Langmuir isotherm and pseudo-second-order kinetics, suggesting a monolayer chemisorption process. Combined characterization analysis confirmed that electrostatic attraction and hydrogen bonding were the primary mechanisms. The former occurred between IFPHC's anionic groups and MB's cationic –N(CH₃)₂⁺ moiety, while the latter involved IFPHC's C–OH/carboxylate groups and the N atom in MB's phenothiazine ring. Therefore, this work demonstrates that solvent-free radical copolymerization provides a green and practical alternative to conventional solvent-based methods for fabricating functional hydrochar. It simultaneously addresses the valorization of PVC-containing waste and the remediation of dye-laden wastewater, presenting a novel strategy that fills the gap for scalable and sustainable adsorbent synthesis.
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BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Zepeng Liu,Jie Zhang,Liping Zhang,Ying Guan,Hao Ji,Yu Zhang,Hui Gao
Biochar (BC) prepared from Medulla Tetrapanacis was recognized as having potential in environmental remediation because of its porous texture, abundant chemical surface groups and mineral composition. In this study, a novel modified biochar (KBC) derived from Medulla Tetrapanacis achieved efficient adsorption of Congo red (CR) and methylene blue (MB). Characterization results suggested that the modification had little effect on the group distribution of KBC, but a dramatic expansion of specific surface area was observed on KBC (1180.45 m 2 /g) compared to BC (198.51 m 2 /g). KBC exhibited a maximum sorption of 584.17 mg/g for CR and 318.01 mg/g for MB. Kinetic and isotherm studies revealed sorption of CR and MB by KBC was chemosorption, which occurred on the monolayer surface. The comprehensive analysis also provided the basis for the application of KBC to practical production. These outcomes suggested that KBC may become a new option for the effluent treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Zhang,Mu Li,Wentao Shang,Mingming Wang,Jianjun Zhang,Feiyun Sun,Mei Li,Xiaoyan Li
Peroxymonosulfate-based advanced oxidation processes (PMS–based AOPs) catalyzed by cobalt nanoparticles have attracted increasing attention due to their special valence electron structure. In this study, nitrogen-doped carbon-encapsulated Co nanoparticle catalysts with core–shell structure were prepared using a simple pyrolysis method at different pyrolysis temperatures (Co@NC-T, T = 650 °C, 750 °C, 850 °C, and 950 °C). Co@NC-750 exhibited excellent activity and high stability for PMS–based removal of methylene blue (MB). More than 99.9 % of MB was degraded with 20 mg/L Co@NC-750 and 100 mg/L PMS within 10 min, displaying good catalytic performance under a wide pH range (3.0–9.0). The quenching tests and electron spin resonance examination results indicated that nonradical, singlet oxygen ( 1 O 2 ), was the major reactive oxygen species in the Co@NC-750/PMS system, other than the radicals. Density functional theory analysis verified that the Co nanoparticles contained heteroatoms N in the carbon layers and provided outstanding activity in activating PMS, as well as good stability, reusability, and versatile adaptability. The analysis of intermediates also revealed that the MB degradation pathway. The results obtained in this study may help to elucidate the application of cobalt species in nonradical–dominated AOPs and stimulate the development of efficient and stable cobalt-based catalysts.
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