PEST MANAGEMENT SCIENCE
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2022
·Vol. 78
·期 8
·3277-3286
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IF 4.462
Renxuan Zou,Baoyu Li,Wengui Duan,Guishan Lin,Yucheng Cui
BACKGROUND Nanopesticides have been proved to be a powerful and promising tool to solve the issues in agriculture. The purpose of the present study was to develop ecofriendly nanopesticide systems by the strategy of comprehensive utilization of two natural biomass resources (bagasse and turpentine oil) because of their incomparable advantages. RESULTS In this research, a series of nanocellulose carriers ETOCN-1 – ETOCN-4 (ETOCN, esterified TEMPO-oxidized cellulose nanofibers) with different degrees of substitution were prepared and characterized by Fourier-transform infrared (FTIR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Then, 21 1,3,4-thiadiazole-amide compounds 8a – 8u containing gem -dimethylcyclopropane ring were designed, synthesized and characterized. A preliminary bioassay indicated that compound 8i (R = p -Br Ph) exhibited broad-spectrum antifungal activity against the tested fungi. Furthermore, drug-loading complexes 8i/ETOCN-1 – 8i/ETOCN-4 were fabricated by integration of nanocellulose-based carriers ETOCN-1 – ETOCN-4 with bioactive compound 8i , and the drug-loading capacities, microstructures and sustained-releasing performance of these complexes were also investigated. According to the observation of scanning electron microscopy (SEM) images of complex 8i/ETOCN-2 , the small-molecule drug and the carrier formed a well-distributed and compact complex, which led to the excellent drug-loading capacity and sustained-releasing performance in the ethanol/water (1:1, v/v ) system. CONCLUSIONS Complexes 8i/ETOCN-1 – 8i/ETOCN-4 deserved further study as the promising candidates for the development of nanopesticides. © 2022 Society of Chemical Industry.
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高影响因子
LANGMUIR
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2022
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IF 4.331
Ying Huo,Yingying Liu,Jian Yang,Hong Du,Chengrong Qin,Hongbin Liu
In this study, a new cellulose nanofibril (CNF) composite aerogel was fabricated using a green and facile mussel-inspired coating strategy. First, the CNF hydrogel was crosslinked by calcium ion followed by immersion in dopamine solution. Second, the surface of CNF was modified using polydopamine (PDA) to obtain PDA@CNF (PCNF) composite aerogel. The PCNF composite aerogels had large surface areas (368.15 m2/g) and low bulk density (27.2 mg/cm3). The composite aerogel exhibited improved mechanical properties, which were almost three times compared with those of CNF aerogel. Moreover, PCNF composite aerogel had good resilience under a wet state. The PDA functional layer remarkably enhanced the adsorption capacities of the composite aerogel for methylene blue (MB). The maximum adsorption of MB was 208 mg/g at an initial dye concentration of 50 mg/L. The adsorption isotherm and kinetic behaviors of the composite aerogel were consistent with Langmuir and pseudo-second-order models. In addition, the PCNF composite aerogels had a high adsorption capacity over a wide pH range. The reuse experiment showed that the removal efficiency of the composite aerogel remained higher than 85% after five cycles. Therefore, PCNF composite aerogels may have potential application in wastewater treatment due to its environmental sustainability and low energy consumption.
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ACS Omega
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2022
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IF 4.132
Ji Shi,Wenyu Huang,Hongxiang Zhu,Jianhua Xiong,Huiting Bei,Shuangfei Wang
Widespread application of TiO2 for degradation of antibiotics is restricted by mainly the low photodegradation efficiency under solar irradiation. To expand the application of TiO2, the key factors that should be improved are visible-light response, yield of electrons and holes, and durability. Herein, we report a visible-light responsive and durable sugarcane-bagasse-derived biochar supported hydrogenated TiO2 (HSCB/H2-TiO2) photocatalyst with higher electron production fabricated by a facile one-pot hydrogenation. Mild hydrogenation temperature preserved the lotus-stem-like structure of sugarcane bagasse and gave the photocatalyst great separability. The superior durability of HSCB/H2-TiO2 was demonstrated by 12 rounds of repeated degradation of methylene blue (MB). In addition, the electron paramagnetic resonance (EPR) results demonstrated that the biochar skeleton contains abundant persistent free radicals (PFRs), which can provide excess electrons to form more •O2–. Meanwhile, radical quenching experiment and EPR radical trapping results also revealed that •O2– was the most dominant species for enrofloxacin (ENR) degradation. Thus, the as-fabricated photocatalyst shows excellent solar-driven degradation of ENR, and 95.6% of ENR was degraded in 180 min under simulated solar irradiation. Possible ENR degradation pathways and mechanism are also proposed based on the identified intermediates.
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ACS Applied Polymer Materials
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2022
·
IF 4.855
Wei Fan,Zhaolu Wang,Xiao Yu,Jiaqi Li,Yan Xu
Depolarizer is an important optical element for high-precision fiber optic gyroscopes in space and long-haul and high-bit-rate fiber transmission optical communication. Carboxylated cellulose nanocrystals prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation prefer to form free-standing films with nematic-like mesostructures whose potential for optical application remains underexploited. Herein, we show that carboxylated cellulose nanocrystals by hydrochloride acid hydrolysis and TEMPO-mediated oxidation self-assemble into nematic-like mesophase that is capable of depolarizing both linearly and circularly polarized light in the visible region. By tuning the carboxylate content at retained fiber aspect ratio, the optimal carboxylated cellulose nanocrystal films to depolarize the visible linearly polarized light with the minimal degree of depolarization of ca. 4% are realized. We present the experimental evidence that birefringent microdomains with substantial variation in the size and orientation acting as numerous waveplates are responsible for the depolarization performance. Finally, we demonstrate how carboxylated cellulose nanocrystal films capable of depolarizing broadband visible circularly polarized light can be leveraged for encrypted patterning.
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Advanced Composites and Hybrid Materials
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2022
·Vol. 5
·期 3
·1852-1864
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IF 11.806
Zhang Feng,Lian Mengying,Alhadhrami A.,Huang Mina,Li Bin,Mersal Gaber A. M.,Ibrahim Mohamed M.,Xu Miaojun
Enzyme immobilization technique has a broad application prospect in the area of biotechnology, biochemistry, and environmental remediation. In this study, the composite hydrogel consisting of dopamine functionalized cellulose nanofiber and alginate was fabricated for immobilization of laccase. Infrared spectra, scanning electron micrographs, and energy dispersive X-ray analysis demonstrated that the laccase molecules were covalently immobilized onto the surface of composite hydrogel. The immobilized laccase exhibited the highest enzymatic activity about 462 U·g −1 . Compared with free laccase, the pH, temperature, and storage stabilities of immobilized laccase were improved dramatically. Moreover, the immobilized enzyme can be easily separated from reaction system and reused. It retained 79.6% of its initial activity after 14 cycles of operation. Immobilized laccase was utilized for efficient degradation of bisphenol A (BPA) from polluted water, and the affecting factors on BPA removal efficiency were analyzed. Greater than 82% of BPA was removed under optimum conditions. A small amount of ABTS was added into BPA degradation; the removal efficiency had reached up to 98.7%. Results indicated that the immobilized laccase has great potential for industrial applications. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Chenwei Li,Xuanying Cai,Qian Fang,Yongxiang Luo,Peng Zhang,Chao Lu,Muen Han,Chun Hu,Lai Lyu
Herein, a novel metal-free catalyst consisting of multiporous oxygen-rich carbon–nitrogen graphene-like nanosheets (O LAA -CN NSs) is first developed through a staged temperature-programmed calcination of l -ascorbic acid (LAA)-modified dicyandiamide precursor. It is found that the oxygen species from l -ascorbic acid (O LAA ) are introduced into the graphene-like basic matrix and replace partial N atoms to form the C O C-R structure, leading to the non-uniform distribution of electrons on the catalyst surface, and the formation of electron-rich centers around the C O C microareas according to a series of characterization techniques. As a result, O LAA -CN NSs exhibits excellent performance for refractory pollutant removal in the presence of peroxymonosulfate (PMS) and dissolved oxygen. Some pollutants with complex structures are even completely degraded within only 1 min. The interface reaction mechanism is further revealed that PMS mainly acts as an active inducer to drive the electron donation of pollutants over O LAA -CN NSs. These electrons are finally utilized by dissolved oxygen to generate reactive oxygen species (ROS) through the interface process. This reaction system results in pollutants that can either be cleaved directly by surface oxidation process or degraded by the attack of the generated ROS, such as singlet oxygen ( 1 O 2 ) and superoxide radicals (O 2 •− ), through oxygen activation, which significantly reduces the resource and energy consumption in advanced wastewater treatment by harnessing the energy of pollutants and dissolved oxygen in the water.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Fugang Hu,Jinsong Zeng,Jinpeng Li,Bin Wang,Zheng Cheng,Tianguang Wang,Kefu Chen
Aramid nanofibers (ANFs) have great potential for civil and military applications due to their remarkable mechanical modulus, excellent chemical reliability, and superior thermostability. Unfortunately, the weak combination of neighboring ANFs limits the mechanical properties of ANF-based materials owing to their inherent rigidity and chemical inertness. Herein, high-performance nanopapers are fabricated by introducing a tiny amount of cellulose nanofibrils (CNFs) to serve as reinforcing blocks via vacuum filtration. As a result of the formation of nanosized building blocks and hydrogen-bonding interaction of CNFs, the resultant ANF/CNF nanopaper yields a record-high tensile strength (406.43 ± 16.93 MPa) and toughness (86.13 ± 5.22 MJ m–3), which are 1.8 and 4.3 times higher than those of the pure ANF nanopaper, respectively. When normalized by weight, the specific tensile strength of the nanopaper is as high as 307.90 MPa·g–1·cm3, which is even significantly superior to that of titanium alloys (257 MPa·g–1·cm3). The ANF/CNF nanopaper also possesses excellent dielectric strength (53.42 kV mm–1), superior UV-shielding performance (≥99.999% absorption for ultraviolet radiation), and a favorable thermostability (Tonset = 530 °C). This study proposes a new design strategy for developing ultrathin ANF-based nanopapers combined with high reliability and thermostability for application in high-end electrical insulation fields, such as 5G communication, wearable electronics, and artificial intelligence.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Hao Sun,Tong Ji,Zechun Ren,Hongjie Bi,Min Xu,Zhenhua Huang,Liping Cai
Sustainable structure materials with excellent strength and toughness have received extensive attentions. However, the great challenge of incorporating high content cellulose into polymeric matrix still remain. In this study, sustainable structural material with an ultrahigh cellulose content of 96.1 wt percent was achieved for the first time through a nacre-inspired mesoscale assembly strategy. Densified TEMPO-oxidized wood (TW) was used as building blocks to prepare TEMPO-oxidated wood reinforced polymer (TWRP) by coating with epoxy resin and cross-laminating. The resulting TWRP with biomimetic “brick-and-mortar” structure exhibited excellent strength of 137 MPa and high toughness of 1.79 MJ m −3 compared with 7.29 MPa and 0.04 MJ m −3 for natural wood, respectively. Meanwhile, the TWRP possessed a low anisotropic factor of 1.07. Moreover, TWRP demonstrated low environmental impact, low cost, low energy consumption, and easy to be expanded from the lab-scale research to the large-scale application, potentially being a low-cost, high-performance, sustainable structural material.
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高影响因子
GREEN CHEMISTRY
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2022
·Vol. 24
·期 4
·1570-1577
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IF 11.034
Ruixue Yangcheng,Jiansu Ran,Zhaohui Liu,Yuntong Cui,Jianjian Wang
Efficient production of high value-added chemicals and biofuels via low-temperature chemoselective HDO of lignin derivatives in water is still a challenge. Here, we construct a low-cost, active and stable Pd/PCE catalyst using phosphoric acid-modified commercial Celite (PCE) as the support, and this catalyst exhibits excellent activity in low-temperature HDO of vanillin as well as other lignin derivatives in water. The superior catalytic performance is due to the presence of P species on the surface of Pd/PCE, accelerating the selective conversion of the intermediate into the final product. Detailed experimental and mechanistic studies reveal that the rapid conversion of the intermediate to the final product proceeds via a free-radical process in an interfacial microenvironment created by intimate interacting between the P species and Pd NPs. The insights of this work provide a new low-cost catalytic system for efficient production of valuable chemicals and future biofuels from lignin derivatives.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
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IF 6.449
Qiuyan Luo,Shan He,Yifeng Huang,Zihua Lei,Jianzheng Qiao,Qing Li,Dong Xu,Xin Guo,Yiqiang Wu
For clean, effective, and high value-added use of wood, a novel non-toxic fluorescent molecularly imprinted hydrogel (FMIH) was prepared based on wood-derived cellulose nanocrystals and carbon dots for efficient sorption and sensitive detection of tetracycline (TC). The FMIH’s morphology, chemical structure, optical properties and non-cytotoxicity were investigated. The adsorption performance of FMIH toward TC was studied, indicating that the sorption data were well fitted by the Langmuir and Pseudo-second-order models, and the maximum sorption capacity was 544.4 mg/g. An evaluation of the detection performance of FMIH toward TC showed its excellent selectivity and sensitivity to TC with the detection limit of 0.11 μg/L. Mechanism analysis confirmed that the efficient sorption and sensitive detection was due to specific molecular recognition sites introduced by wood-derived cellulose nanocrystals and carbon dots. Moreover, a cost analysis performed for FMIH and commercial activated carbon (CAC) showed that the cost of removing 1 g of TC using FMIH was almost thirty-four times cheaper than that of CAC. This work could provide a new way for using wood to produce a low-cost, multifunctional, and green adsorbent for removing antibiotics.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Xiaochen Li,Zihao Yang,Ying Peng,Fengfan Zhang,Meiqin Lin,Juan Zhang,Qichao Lv,Zhaoxia Dong
Efficient micron-sized droplet separation materials have become a new demand for environmental protection and economic development. However, existing separation methods are difficult to be effectively used for micron-sized water droplets surrounded by viscous oil, and common materials have difficulty maintaining hydrophilicity underoil. Here, inspired by the microstructure of tree xylem, we report a cellulose–polyurethane sponge (CP-Sponge) with wood-like pores and underoil superhydrophilicity using directional freeze-casting. The CP-Sponge has an excellent selective water absorption capacity underoil and compression resilience. This preparation strategy can flexibly control the sponge’s dimensional morphology. The designed cylindrical CP-Sponge can be easily installed in the silicone tube of a peristaltic pump. During pump operation, with a simple absorption, compression, and recovery process, the CP-Sponge continuously and effectively removes micron-sized water from crude oil and lubricating oil, reducing residual water in the oil to less than 2 ppm. The absorption-saturated sponge can be dried to continue recycling. Eco-friendly, recyclable, and sustainable artificial porous sponges provide new ideas and inspiration for the practical application of deep dehydration of viscous oils.
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高影响因子
Journal of Environmental Sciences
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2022
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IF 6.796
Fuyou Du,Zhan Lai,Huiyang Tang,Haiyan Wang,Chenxi Zhao
In this work, a novel dual Z-scheme Bi 2 WO 6 /g-C 3 N 4 /black phosphorus quantum dots (Bi 2 WO 6 /g-C 3 N 4 /BPQDs) composites were fabricated and utilized towards photocatalytic degradation of bisphenol A (BPA) under visible-light irradiation. Optimizing the content of g-C 3 N 4 and BPQDs in Bi 2 WO 6 /g-C 3 N 4 /BPQDs composites to a suitable mass ratio can enhance the visible-light harvesting capacity and increase the charge separation efficiency and the transfer rate of excited-state electrons and holes, resulting in much higher photocatalytic activity for BPA degradation (95.6%, at 20 mg/L in 120 min) than that of Bi 2 WO 6 (63.7%), g-C 3 N 4 (25.0%), BPQDs (8.5%), and Bi 2 WO 6 /g-C 3 N 4 (79.6%), respectively. Radical trapping experiments indicated that photogenerated holes (h + ) and superoxide radicals (•O 2 − ) played crucial roles in photocatalytic BPA degradation. Further, the possible degradation pathway and photocatalytic mechanism was proposed by analyzing the BPA intermediates. This work also demonstrated that the Bi 2 WO 6 /g-C 3 N 4 /BPQDs as effective photocatalysts was stable and have promising potential to remove environmental contaminants from real water samples.
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高影响因子
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