JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Yaqi Xiao,Zhi Cai,Ying Yi,Yihua Yin,Weiquan Cai,Guanghua He,Jingli Zhang,Wenjin Xu,Yaru Li
Cationic photosensitizers have higher photodynamic antibacterial activity compared with anionic photosensitizers, and with low toxicity and no drug resistance. However, their poor photostability and low utilization rate limit their practical applications. Herein, a new strategy for the construction of a GSH-responsive antibacterial nanogel system is developed via the electrostatic interaction between methylene blue (MB) and sulfonated sodium alginate (HSSA) to self-assemble into nanoparticles followed by sulfhydryl cross-linking in an aqueous solution. The photobleaching of MB can be inhibited due to the self-aggregation-caused quenching (ACQ) effect, but the photodynamic activity can be restored by breaking the disulfide-crosslinking bonds in the nanogel in response to 10 mM GSH. In vitro antibacterial tests prove that the system has antibacterial activity beyond anionic photosensitizers. Antibacterial studies on plants show that the system has targeted antibacterial activity on infected plants and good wettability, retention, and adhesion to plant leaves. Safety evaluation shows that the system has no obvious toxic effect on plants. Therefore, this study provides a new approach to the discovery of novel photodynamic bactericides.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Wenjing Zhang,Yin Zeng,Fengying Cai,Hongliang Wei,Yuxuan Wu,Hui Yu
Hydrogels based on biopolymers have attracted considerable interest in the last decades. Herein, an interpenetrating network hydrogel (IPN-Gel) adsorbent from starch-chitosan was fabricated facilely in one-pot through tandem Schiff base reaction and photopolymerization. First, aldehyde starch (DAS) was synthesized by the reaction of soluble starch with sodium periodate. Afterward, acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), polyethylene glycol dimethacrylate (PEGDMA), photoinitiator, chitosan and DAS were dissolved in water to obtain a clear solution. Schiff base reaction between chitosan and DAS took place quickly to form the first network, and then photopolymerization of AM, AMPS, and PEGDMA occurred under ultraviolet radiation to form the second network. The preparation conditions of the as-prepared IPN-Gel were optimized with two indexes of gel mass fraction and swelling ratio. Its swelling behavior with pH and temperature change was explored. Finally, its adsorption performance was characterized with methylene blue (MB) as a model contaminant. The maximum adsorption capacity of IPN-Gel can reach 2039 mg·g −1 at pH =10. Its adsorption performance accords with Langmuir isothermal model and pseudo-second-order kinetic model and it was mainly controlled by chemisorption. This strategy is expected to found broad application prospects in the preparation of hydrogel adsorbents.
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Catalysts
·
2025
·Vol. 15
·期 1
·69
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IF 4
Yuning Liang,Baohui Wang,Tao Cheng,Mingchun Bi,Weimeng Chi,Yuxi Liu,Wenjing Zhang,Yuxuan Liu
A novel dual Z-scheme heterojunction photocatalyst was constructed by introducing the narrow-bandgap semiconductor CuInS2(CIS) into the dual metal-organic framework (MOF) system of UiO-66(Zr) and NH2-MIL-101(Fe). This structure effectively overcomes the limitations of conventional photocatalysts in terms of light absorption range and the separation efficiency of photogenerated charge carriers. The prepared ternary catalyst, (UiO-66(Zr))-(NH2-MIL-101(Fe))/CuInS2, exhibited excellent photocatalytic performance under visible light irradiation, achieving a hydrogen production rate of 888 μmol g−1h−1and a methylene blue (MB) degradation efficiency of up to 95.03%. The significant enhancement in performance is attributed to the material’s porous structure, extended light absorption range, and optimized electron transfer pathways. Additionally, the construction of the dual Z-scheme heterojunction further promotes the separation and migration of photogenerated charge carriers, suppressing electron–hole recombination. This study demonstrates the great potential of dual Z-scheme heterojunctions in improving photocatalytic efficiency and provides an important theoretical foundation and design strategy for the development of efficient photocatalysts.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yong Chen,Huiping Zeng,Jiaxin Xu,Dong Li,Jie Zhang
Currently, there are well-operated iron removal water plants in the northeast region of China. Among them, the backwash process produces a large amount of iron-containing sludge (IS) year by year, which can cause some harm to the environment if not treated. The main form of existence for IS is amorphous γ-FeOOH, and this work demonstrates that IS is a natural and highly active catalyst for periodate(PI). Moreover, IS showed strong stability in environmental factor effects and reproducibility experiments. EPR with quenching experiments proved that IS could activate PI to produce •OH, O 2 •− , 1 O 2 , and IO 3 • . In the degradation experiments where methylene blue was chosen as the model pollutant, IO 3 • , and 1 O 2 were the substances that served the prominent role in degradation. This work provides an inexpensive and feasible way to dispose of waste iron-containing sludge from water plants and provides fundamental insights into the degradation mechanism of organic pollutants through the activation of PI by IS.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xubing Sun,Shiyu Yin,Li Zhao,Wenhua Yang,Yaohui You
In this work, tannic acid was selected as a green cross-linking agent to cross-link carboxymethyl chitosan to prepare a magnetic adsorbent (CC-OTA@Fe 3 O 4 ), which was used to remove methylene blue (MB) and Cu 2+ . CC-OTA@Fe 3 O 4 was characterized by FTIR, 13 C NMR, XRD, VSM, TGA, BET and SEM. The adsorption behavior was studied using various parameters such as pH value, contact time, initial concentration of MB and Cu 2+ , and temperature. The results showed that adsorption of MB and Cu 2+ followed the pseudo-second-order model and the Sips model. The maximum adsorption capacities were determined to be 560.92 and 104.25 mg/g MB and Cu 2+ at 298 K, respectively. Thermodynamic analysis showed that the adsorption is spontaneous and endothermic in nature. According to the results of FTIR and XPS analyses, the electrostatic interaction was accompanied by π–π interaction and hydrogen bonding for MB adsorption, while complexation and electrostatic interaction were the predominant mechanism for Cu 2+ adsorption. Furthermore, CC-OTA@Fe 3 O 4 displayed remarkable stability in 0.1 M HNO 3 , exhibited promising recyclability, and could be easily separated from aqueous solutions in the magnetic field. This study demonstrates the potential of CC-OTA@Fe 3 O 4 as an adsorbent for the removal of cationic dyes and heavy metals from wastewater.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Peng Jiang,Li Zhou,Yongfen Han,Wei Fu,Sheng Su,Maoqin Zeng
The burning of corn straw will cause serious air pollution, and the utilization of corn straw can avoid the burning of corn straw and reduce environmental pollution . The pyrolysis of corn straw into biochar (BC) is a promising approach to apply corn straw in environmentally sustainable development . Dye wastewater such as methyl orange (MO) and methylene blue (MB) is a pollution that poses a threat to human health and the environment. Herein, biochar/TiO 2 (BC/TiO 2 ) and biochar/ZnO (BC/ZnO) were prepared by pyrolysis of corn straw for the photodegradation of MO and MB in water. The MO removal rates of BC/TiO 2 and BC/ZnO are up to 83.3 % and 76.2 %, respectively, and the MB removal rates of BC/TiO 2 and BC/ZnO are 78.6 % and 71.4 %, respectively. The photothermal effect of BC improves the surface temperature of photocatalysts and promotes the separation and transfer of photogenerated electron-hole pairs, enhancing the photodegradation of MO and MB efficiencies. Three-dimensional (3D) FDTD simulations were performed to investigate the mechanism of photothermal effect in BC/TiO 2 and BC/ZnO. This work provides a promising approach to the utilization of corn straw.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shuang Jia,Zhijie Mao,Bo Zhang,Yaru Wang,Tianyang Sun,Guanhua Jin,Chuang Wang,Yichen Lv,Shouzhu Li,Dan Sun
Hierarchical porous activated carbon (WXAC) was synthesized from walnut xylem. Precarbonization first preserved the vascular bundle structure, followed by controlled KOH activation-etching to precisely develop the porous architecture. Systematic characterization (BET, XRD, SEM, XPS, FTIR) confirmed a 3D interconnected microtubular structure with ultrahigh surface area (3116 m 2 /g) and pore volume (1.69 cm 3 /g). This hierarchical architecture combines microporous dominance with meso/macropore synergism, while oxygen enrichment (11.6 %) and abundant functional groups enhance methylene blue (MB) adsorption. WXAC achieves exceptional adsorption capacity (1015.29 mg/g) with rapid initial kinetics (125.8 mg/(g·min) within 5 min. Over 75 % removal efficiency persists through three regeneration cycles. Mechanistic investigations identified synergistic adsorption pathways combining hydrogen bonding, electrostatic interactions, π-π stacking, and pore confinement. Furthermore, the adsorption process follows pseudo-second-order kinetic and Redlich-Peterson isotherm models, suggesting the coexistence of monolayer and multilayer adsorption mechanisms. Thermodynamic parameters confirm spontaneous endothermic behavior. This work transforms agroforestry waste into high-performance adsorbents through controlled pore engineering.
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LANGMUIR
·
2024
·
IF 3.7
Haoqiu Chen,Tingting Wang,Yanfen Sun,Zhiwei Chen,Juan Yuan,Lianxin Luo
Effective treatment of dye wastewater is currently a great concern and a research hotspot. Electrocatalysis has unique advantages in treating toxic and harmful refractory dye wastewater; however, it requires an external power supply, which increases energy consumption and cost. As a new energy collection technology, triboelectric nanogenerators (TENGs) have gained considerable attention. In this study, an origami multilayer spherical friction nanogenerator (Q-TENG) was developed for the removal of methylene blue (MB) from dye wastewater. The current and voltage output performances of Q-TENG were explored, and the removal and degradation mechanisms of MB were discussed. Results indicated that when the water wave acceleration a = 3 m/s2, the open-circuit voltage and short-circuit current reached the maximum values of 179 V and 9.4 μA, respectively. The self-powered catalytic degradation of MB using Q-TENG can produce more •OH and SO4–•, and the free radicals increase with increasing action time of Q-TENG, thus increasing the degradation efficiency of MB. This study provides a new strategy for solving the problem of high energy consumption during electrochemical reactions in wastewater treatment.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yuhan Xia,Shixin Zhang,Xiaomin Tang,Bin Yan,Huaili Zheng
The flocculation of dyeing wastewater generated a large amount of sludge that was often disposed as refractory hazardous waste. The resource utilization of flocculation sludge was of great significance in terms of low treatment cost of sludge, low environmental risk and high usage efficiency of reactive dyes. Herein, a flocculation sludge-derived (FSD) adsorbent was prepared via cross-linking of flocculation sludge yielding by carboxymethyl chitosan-based flocculants and dyes. FSD adsorbent had excellent selective adsorption performance for methylene blue (MB) treatment. The highest removal rate of MB and adsorption capacity of FSD adsorbent were 96.48 % and 354.7066 mg/g, attributing to its rich functional groups, negative charges and special micropore structure. FSD adsorbent owned the favorable regeneration efficiency and stability. Its removal rate of MB was still above 71.8 % after 6 regeneration-adsorption cycles. Its leaching rate of dyes was only 0.0016 mg/mg that was rather lower than common dried flocculation sludge. The adsorption processes of FSD adsorbent were complex in accordance with its characteristics, adsorption isotherms, adsorption kinetics and theoretical calculation. Multiple adsorption mechanisms were present in the treatment of dyeing wastewater by FSD adsorbent. The resource utilization of flocculation sludge, as adsorbents, was a potential candidate in field application.
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Royal Society Open Science
·
2024
·Vol. 11
·期 7
·
IF 2.9
Jia-yi Ye,Man-qing Ye,Ling Zhang,Wen Li,Yan-shan Li,Zhi-wei Fu
Nano-Fe3O4 was loaded onto coconut-based activated carbon fibres (CACF) using an electrostatic self-assembly method. The effects of the mass ratio of CACF to nano-Fe3O4, loading time, pH and temperature on the loading effect were investigated and ideal loading conditions were determined. To study the adsorption performance of MACF@Fe3O4 for methylene blue, the effects of the initial concentration, pH and time on the adsorption were investigated and the working conditions of adsorption were established. MACF@Fe3O4 was systematically characterized. Adsorption kinetics were investigated under ideal conditions. The ideal loading conditions for MACF@Fe3O4 were as follows: mass ratio of 1:1, 20 min, pH 9.36, 22.5°C. The saturation magnetization of MACF@Fe3O4 was 48.2263 emu·g−1, which could be quickly separated under an external magnetic field. When the dosage was 0.010 g, the adsorption rate reached 97.29% and the maximum adsorption capacity was 12.1616 mg·g−1. The adsorption process conformed to pseudo-first-order kinetics during the first 15 min and pseudo-second-order kinetics during 20–120 min. The equations were ln(Qe-Qt)=2.2394-0.0689t and tQt=0.0774 + 0.5295t, respectively. The isothermal adsorption model showed that MACF@Fe3O4 was more in line with the Langmuir model, indicating that the adsorption process was mainly monolayer adsorption. The thermodynamic analysis results showed that the adsorption process of MB by MACF@Fe3O4 was an endothermic process. In this study, MACF@Fe3O4 with high adsorption capacity and easy separation from coconut palm fibres has good application prospects in the field of adsorption, which can promote the high-value utilization of coconut palms.
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Science of Advanced Materials
·
2019
·Vol. 11
·期 1
·116-127
·
IF 1.158
Sun Qiang,Zheng Huaili,Zheng Xinyu,Hu Xuebin,An Yanyan,Liu Hongxia,Zhao Chuanliang
In this study, a kind of novel dual flocculants system was prepared by premixing polydopamine (PDA) with anion polyacrylamide (APAM) to remove nickel ions and methylene blue from aqueous solutions. Polydopamine was prepared by oxidant-induced self-polymerization of dopamine. Anion polyacrylamide
was synthesized by acrylamide, acrylic acid and 2-acrylamido-2-methyl-1-propanesulfonic acid under ultraviolet irradiation. Various analytical methods were applied to characterize and exhibit the successful synthesize of polydopamine and anion polyacrylamide. The flocculation performance was
evaluated and results indicated that chelation reaction and π–π stacking effects of PDA, meanwhile adsorption and bridging effects of APAM for nickel ions and methylene blue molecules removal were dominant in neutral and alkaline condition, whereas charge neutralization
of APAM was favored in weak acidic condition. The maximum removal efficiency of nickel ions and methylene blue was 99.2% and 96.7% under the optimum condition, respectively. This work provides a scientific basis and a platform for the application of polydopamine-anion polyacrylamide to remove
heavy metal ions and dyes from aqueous environment.
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Journal of Saudi Chemical Society
·
2021
·
IF 3.932
Tao Chen,Yuan Zhao,Ya-nan Sang,Min Tang,Guo-wen Hu,Xiao-bing Han,Jie Gao,Rui Ma
Efficient adsorption and separation of organic dyes in the wastewater is highly desirable for environmental protection. A facile synthesis of magnetic bio-based chitosan (CS) microspheres grafted with sodium polystyrene sulfonate (SPSS) via electron beam radiation is described. The obtained microspheres were characterized by FTIR, SEM, TG and VSM, which demonstrated millimetric magnetic CS-g-SPSS microspheres were obtained with enhanced thermal stability. Experimental parameters such as absorbed dosage, mass ratio, initial pH, initial concentration and contact time for the adsorption were thoroughly investigated. To investigate the adsorption rate and recyclability, evaluation of adsorption kinetic model and adsorption/desorption experiment were conducted.
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