CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Wei Fan,Jiaqi Li,Lihong Wei,Yan Xu
Carboxylated cellulose nanocrystals prepared by TEMPO-mediated oxidation exhibit a distinct ability to form nematic order, however, their ability to form chiral nematic films remains relatively unexplored. In this study, bleached cotton pulp hydrolyzed with hydrochloric acid and oxidized by TEMPO-mediated oxidation produce carboxylated cellulose nanocrystals with different aspect ratios 33.1, 32.8, 30.9, 29.0 and 28.9, and surface charge densities 0.16, 0.56, 1.00, 1.25, and 1.42 e·nm −2 . By tuning the aspect ratio and surface charge density, the optimal carboxylated cellulose nanocrystals producing left-handed chiral nematic films by evaporation-induced self-assembly are obtained. The left-handed chiral nematic films enable selective reflection of left-handed circularly polarized light with the peak wavelength tunable from the visible to the near-infrared regime by modifying the characteristics of nanorods and suspensions. Such carboxylated cellulose nanocrystal films transform spontaneous luminescence to right-handed circularly polarized luminescence with the peak luminescence dissymmetry factor of −0.51.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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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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PEST MANAGEMENT SCIENCE
·
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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FOOD HYDROCOLLOIDS
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2022
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IF 11.504
Chan Lei,Yunxiao Xie,Yilan Wu,Yan Li,Bin Li,Ying Pei,Shilin Liu
The stabilization of food-grade water in water (W/W) emulsions, as a potential candidate for encapsulating water-soluble functional components, remain a significant challenge in food science research. The main purpose of the work was to find a suitable particle for the preparation of the novel W/W emulsion. This system was composed of two immiscible water-soluble biopolymers (dextran and maltodextrin), and stabilized by using bacterial cellulose (BC) nanofibrils. The BC-stabilized W/W emulsions were successfully fabricated with the 20 wt% dextran (DEX) and the 10 wt% maltodextrin (MAL). There was no significant change in the droplet size of the emulsion with increasing BC surface charge from 0.41 mmol/g to 1.41 mmol/g dry cellulose. Meanwhile, the apparent viscosity, storage modulus ( G′ ) and loss modulus ( G″ ) of the emulsions were decreased with increasing BC surface charge. The stabilization mechanism of the W/W emulsion was due to the formation of viscoelastic network structure by BC nanofibrils. When the BC content increased from 0.04 wt% to 0.16 wt%, the emulsion droplet size was decreased from 3.78 ± 0.79 μm to 2.01 ± 0.40 μm. Furthermore, the obtained W/W emulsion did not demulsify within 7 d, it had better stability than that of the reported W/W emulsion. Moreover, the BC-stabilized emulsion was insensitive to the change of ionic strength concentration (0–200 mM) and pH (3–11). In brief, it was the first report to use BC nanofibrils to stabilize the W/W emulsion, which enriched the type of W/W emulsion.
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FOOD CHEMISTRY
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2022
·
IF 9.231
Feiyang Li,Yaqiong Zhang,Xiaomin Tang,Peize Song,Lijing Su,Junfeng Fan
This study aimed to improve the emulsifying properties of microcrystalline cellulose by carboxylating (CC) and bridging to hydrophobic oat globule peptides (HP) via Ca 2+ (CC-Ca-HP). FTIR and XRD spectra analysis proved the successful attachment of HP to CC through a salt bridge. The Ca 2+ -bridging significantly changed the particle characteristics of CC-Ca-HP, including particle size, ζ-potential, and wettability. The Ca 2+ -bridged composite CC-Ca-HP demonstrated remarkable emulsifying stability compared with the nonbridged blend (CC–HP). Further analysis of the steady flow characteristics and dynamic viscoelastic properties revealed a network structure formed in the CC-Ca-HP emulsion. Moreover, the CC-Ca-HP emulsion showed a marked release of free fatty acids, increased bioaccessibility of zeaxanthin in the simulated gastrointestinal digestion, and less oil oxidation under the accelerated oxidation condition, indicating that the stable structure of CC-Ca-HP imparted by Ca 2+ -bridging prevented the aggregation of oil droplets as collision occurred under the harsh gastric conditions.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Jinghui Jiang,Xiaoxia Chen,Gong-Liang Zhang,Hongshun Hao,Hong-Man Hou,Jingran Bi
To improve the mechanical and barrier properties of cellulose and chitosan (CS) and to allow the application of volatile antibacterial benzyl isothiocyanate (BITC) in active packaging, a double-layer nanocomposite film was prepared. Cellulose nanofibers (CNF) were crosslinked with CS via genipin to build the substrate. Quaternized cellulose nanocrystals (QCNC) were synthesized for carrying BITC as the coating material . By the layer-by-layer self-assembly approach, CS-CNF/QCNC-BITC film was fabricated. This film possessed the tensile strength of 33.75 MPa, low permeabilities of oxygen (6.9 × 10 −17 m 3 /s·m·Pa) and moisture (1.2 × 10 −11 g/s·m·Pa), and good antibacterial activity with the inhibition zone diameters of 4.9, 4.2 and 2.7 cm against Escherichia coli , Salmonella typhimurium and Staphylococcus aureus . The total viable count , total volatile basic nitrogen and thiobarbituric acid-reactive substances of the chicken wrapped CS-CNF/QCNC-BITC were only 4.4 log CFU/g, 17.7 mg/100 g and 0.44 mg/kg at 14 days, indicating a potential application of CS-CNF/QCNC-BITC for food packaging.
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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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ACS Applied Materials & Interfaces
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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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Chemistry-An Asian Journal
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2022
·Vol. 17
·期 15
·e202200309
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IF 4.839
Haoran Zhang,Yachong Liu,Rong Jin,Sanyang Han,Qianqian Su
Graphical A novel excitation energy lock-in approach is developed to boost ultraviolet upconversion emission in a new class of multilayer core-shell nanoparticles with a gadolinium-rich core domain and optically inert NaYF 4 interlayer. These UV-emitting upconversion nanoparticles are promising for NIR-responsive reactive oxygen species generation. Multiphoton upconversion that can convert near-infrared irradiation into ultraviolet emission offers many unique opportunities for photocatalysis and phototherapy. However, the high-lying excited states of lanthanide emitters are often quenched by the interior lattice defects and deleterious interactions among different lanthanides, resulting in weak ultraviolet emission. Here, we describe a novel excitation energy lock-in approach to boost ultraviolet upconversion emission in a new class of multilayer core-shell nanoparticles with a gadolinium-rich core domain. Remarkably, we observe more than 70-fold enhancements in Gd 3+ emission from the designed nanoparticles compared with the conventional nanoparticles. Our mechanistic investigation reveals that the combination of energy migration over the core domain and optically inert NaYF 4 interlayer can effectively confine the excitation energy and thus lead to intense multiphoton ultraviolet emission in upconversion nanostructures. We further achieve a 35.6% increase in photocatalytic reactivity and 26.5% in reactive oxygen species production yield in ZnO-coated upconversion nanocomposites under 808-nm excitation. This study provides a new insight to energy transfer mechanism in lanthanide-doped nanoparticles and offers an exciting avenue for exploring novel near-infrared photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Sheng-Nan Zhuo,Hong-Yu Ren,Guang-Li Cao,Guo-Jun Xie,De-Feng Xing,Nan-Qi Ren,Bing-Feng Liu
In this study, an encapsulated nanoscale zero-valent iron biochar (BC-Fe 0 ) derived from waste lignocellulose rice straw (RS) was synthesized. BC-Fe 0 has excellent properties, including long-term stability, a large specific surface area, many micropore structures, active defects active and oxygen-containing groups. The material was first used to activate persulfate (PDS), showing a highly efficient catalysis for acetaminophen (ACT) degradation. The removal efficiency of ACT within 20 min reached 100%, and the degradation rate constant ( k obs ) reached 0.37475 min −1 at the ACT concentration of 10 mg/L, BC-Fe 0 of 0.5 g/L, temperature of 298 K. EPR demonstrated that ·OH, SO 4 −· , ·O 2 − and 1 O 2 occurred during the reaction process, and ·O 2 − , 1 O 2 and electron transfer played major roles in PDS/BC-Fe 0 system. Fe 0 nanoparticles promoted the activation of PDS to generate ·O 2 − , which induced a series of other reactive oxygen species (ROS) to attack ACT. C = O might also contribute to the production of 1 O 2 . In addition, graphitic carbon, C–O, defects and micropores on BC-Fe 0 together created a rich electron environment, which is conducive to the redox reaction between ACT and ROS. Satisfyingly, BC-Fe 0 not only had a high catalytic activation capacity, but also exhibited a desirable durability and recyclability. The development of BC-Fe 0 catalysts and the study of PDS activation for organic pollutant degradation are significant to biomass conversion and advanced oxidation processes in environmental remediation.
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CHEMOSPHERE
·
2022
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IF 8.943
Di Liu,Yunning Chen,Renquan Guan,Jie Zhao,Huimin Jin,Siyi Zhang,Qingkun Shang
In this paper, a type of heterojunction photocatalyst S-Tyr-NDI-Tyr/TiO 2 was prepared by self-assembly of tyrosine-substituted naphthamide (NDA) and bonding with titanium dioxide. The self-assembly process and driving force of monomer M-Tyr-NDI-Tyr were simulated by theoretical calculation. Taking atenolol as the target pollutant, the photocatalytic performance of the heterojunction photocatalyst under visible light was studied, and the degradation products were analyzed by mass spectrometry. The environmental toxicity of photocatalytic process was evaluated by luminescent bacteria. The principle of high photocatalytic activity of S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst was proposed by analyzing the fluorescence spectrum, photocurrent density and resistance, electron paramagnetic resonance spectrum, free radical capture experiment and energy band position of S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst. In addition, the photocatalytic degradation of different pollutants by S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst was also studied. This work will provide a useful example for the further development of new and efficient organic supramolecular/inorganic semiconductor composite photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
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IF 9.965
Manman Li,Kunlun Yang,Xin Huang,Shiguang Liu,Yifan Jia,Peng Gu,Hengfeng Miao
In this study, the flat microfiltration ceramic membrane (CM) was modified by wet impregnation method (Mn-Fe-CM) to catalyze ozone (O 3 ) for the oxidative degradation of trimethoprim (TMP). The conventional characterization test showed that the Mn-Fe binary oxides (Mn/FeO x ) with the crystal structure of FeMnO 3 were successfully loaded on the membrane and the catalytic performance of Mn-Fe-CM for O 3 was apparently enhanced as compared to CM. Consequently, compared with O 3 oxidation alone, the degradation and mineralization efficiencies of TMP in the O 3 /Mn-Fe-CM system were both improved and 98.6% of TMP could be removed within 10 min. The degradation efficiency of TMP decreased with the increasing pH and the addition of Cl - 、HCO 3 – 、PO 4 3- , while humic acid (HA) exhibited negative effect on the TMP removal. Radical scavenger experiment and electron paramagnetic resonance (EPR) analysis confirmed that direct oxidation by O 3 played an important role in the degradation of TMP, while hydroxyl radical (·OH) and 1 O 2 also participated. Fe(II) could act as an intermediate to transfer electrons and accelerate the transformation of Mn(III) to Mn(II) and Mn(IV) to Mn(III) during the ozonation process, which definitely strengthened the synergic catalytic effect of Mn-Fe-CM. The proposed degradation mechanism of TMP mainly contained hydroxylation , carbonylation , demethoxylation and deamination . Due to the strong catalytic ozonation performance for organic pollutants degradation, the O 3 /Mn-Fe-CM system revealed better anti-membrane fouling ability, strong cyclic usage performance and high applicability for the actual surface water treatment.
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