CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Ming Zhao,Hongjun Zhou,Li Hao,Huayao Chen,Xinhua Zhou
The increasing world-wide demand for food has prompted the development of efficient and environmentally friendly pesticide formulations. In this article, we have prepared CMC-g-PRSG carrier based on two compounds from natural materials carboxymethyl cellulose (CMC) and rosin (RS). The model pesticide avermectin (AVM) was encapsulated through hydrophobic interaction, and self-assembled to form nanopesticide AVM@CMC-g-PRSG with an average particle size of 167 nm. The prepared nanopesticide displays enhanced dispersibility and stability of AVM in water, and can effectively adhere to the leaves to prevent loss. The release rate of AVM encapsulated in the nanocarrier can be controlled by adjusting pH, and AVM half-life under ultraviolet radiation shows a 3-fold increase allowing control of pests for prolonged periods of time in practical applications. Biological safety tests showed that AVM@CMC-g-PRSG effectively reduces the toxicity of AVM to aquatic animals. Therefore, the cheap and degradable carrier CMC-g-PRSG can improve the effect of hydrophobic pesticides.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Xin Huang,Li Wang,Jiabo Zhang,Xiaojing Du,Shijia Wu,Hongxin Wang,Xinlin Wei
A new type of double-network hydrogel, cross-linked with microcrystalline cellulose grafted with ε-polylysine (MCC-PL) and N , N -methylene bisacrylamide/acrylic acid, was synthesised to efficiently inhibit bacterial proliferation and remove heavy metals. The physicochemical properties of the MCC-PL hydrogel (MCC-PLH) were characterised using scanning electronic microscopy, Fourier transform infrared spectroscopy , X-ray diffraction, thermogravimetric analysis , and differential thermogravimetric analysis . The adsorption results showed that the optimal adsorption conditions were temperature of 313 K at pH of 5 and 6 of Pb 2+ and Cu 2+ , respectively. The adsorption mechanism of MCC-PLH5 was successfully determined using Freundlich isotherm, pseudo-second kinetics, and intra-particle diffusion model, in conjunction with X-ray photoelectron spectroscopy. Adsorption thermodynamic studies indicated that the process was spontaneous and endothermic. Antibacterial experiments showed that PL-grafted MCC hydrogel exhibited more efficient and durable antibacterial activity than MCC, indicating its potential for water decontamination.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Technological Sciences
·
2020
·Vol. 64
·期 3
·548-558
·
IF 2.302
Wang Tao,Liu XiQing,Ma ChangChang,Wei MaoBin,Huo PengWei,Yan YongSheng
Non-biodegradable and toxic photocatalysts pose as secondary threats to the environmental security. In this work, non-toxic biocomposites were prepared using natural bamboo cellulose fibers (CF), polyvinyl alcohols (PVAs), BiVO 4 , and carbon dots (CDs) from biomaterials. Thereafter, their optical properties, chemical characterizations, and photocatalytic performances were evaluated. The novel BiVO 4 (-)CF@CDs(-)PVA composites were prepared via the combined implementation of in situ and impregnation methods. The optical properties revealed that the CDs and fibers increased the range and intensity of light absorption. The PVAs were used as the shield and dispersant to enhance stability because they have numerous chemical groups. In view of the various possible paths of electron migration, the enhanced photocatalytic activity of BiVO 4 (-)CF@CDs(-)PVA composites for tetracycline degradation was observed under visible light illumination. The origins of the structure, morphology, and optical mechanism in the enhancement of the photocatalytic ability of BiVO 4 (-)CF@CDs(-)PVA composites were discussed and demonstrated.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Richard M. Kasomo,Hongqiang Li,Huifang Zheng,Qian Chen,Xiaoqing Weng,Akisa D. Mwangi,Wu Ge,Shaoxian Song
In this paper, Na-CMC was studied as a depressant for almandine during flotation separation of rutile using cationic surfactant, octadecyl amine polyoxyethylene ether (AC1815) as a collector. Results of micro-flotation studies suggested that Na-CMC was considered as a selective depressant for almandine. Zeta potential and X-ray Photoelectron Spectroscopy (XPS) were used to elucidate the interaction mechanism between the minerals (rutile and almandine) and Na-CMC. The XPS analysis results show that there was both the chemical and hydrogen bonding in the interaction between almandine and Na-CMC. Zeta potential measurements indicate that, the adsorption of carboxylic groups on the almandine ferrous active sites, takes place with chemisorption which in turn depressed the almandine floatability. Contact angles results on the other hand shows that the floatability of almandine was adversely affected after being treated with Na-CMC, while the same depressant did not have any pronounced negative effect on the floatability of rutile.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yanan Yin,Chenggang Zhang,Jisi Chen,Wenchao Yu,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
Flexible electrostatic capacitors have many potential applications in modern electric power systems. In this study, flexible cellulose-based dielectric films were prepared by compositing regenerated cellulose (RC) and one-dimensional BaTiO 3 nanofiber (BTNF) via a simple and environmentally friendly process. To improve compatibility and distributional homogeneity of the fillers/matrix, BTNF was surface modified by dopamine to prepare the poly(dopamine) modified BTNF (PDA@BTNF). The obtained RC/PDA@BTNF composite films (RC-PDA@BTNF) possessed higher dielectric constant and breakdown strength than those of the RC and RC/BTNF composite films. In particular, RC/PDA@BTNF composite films with 2 vol% PDA@BTNF (RC-2PDA@BTNF) exhibited a high discharged energy density of 17.1 J/cm 3 at 520 MV/m, which exceeded 40 % compared with that of RC-2BTNF at 460 MV/m. Meanwhile, RC-2PDA@BTNF could continuously work for more than 10,000 times with a high efficiency of 91 %. Furthermore, the composite films could maintain good dielectric properties for a long time when stored in vacuum condition (under 0.3 atm). Therefore, these flexible cellulose-based dielectric materials are promising in the field of novel high-performance film dielectric capacitors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 1
·169
·
IF 4.324
Zhencheng Yu,Chuanshuang Hu,Anthony B. Dichiara,Weihui Jiang,Jin Gu
Advances in nanoscale science and engineering are providing new opportunities to develop promising adsorbents for environmental remediation. Here, hybrid aerogels are assembled from cellulose nanofibrils (CNFs) and carbon nanomaterials to remove cationic dye methylene blue (MB) and anionic dye Congo red (CR) in single and binary systems. Two classes of carbon nanomaterials, carbon nanotubes (CNTs) and graphene nanoplates (GnPs), are incorporated into CNFs with various amounts, respectively. The adsorption, mechanics and structure properties of the hybrid aerogels are investigated and compared among different combinations. The results demonstrate CNF–GnP 3:1 hybrid exhibits the best performance among all composites. Regarding a single dye system, both dye adsorptions follow a pseudo-second-order adsorption kinetic and monolayer Langmuir adsorption isotherm. The maximal adsorption capacities of CNF–GnP aerogels for MB and CR are 1178.5 mg g−1and 585.3 mg g−1, respectively. CNF–GnP hybrid show a superior binary dye adsorption capacity than pristine CNF or GnP. Furthermore, nearly 80% of MB or CR can be desorbed from CNF–GNP using ethanol as the desorption agent, indicating the reusability of this hybrid material. Hence, the CNF–GnP aerogels show great promise as adsorption materials for wastewater treatment.Keywords:cellulose nanofibrils;graphene nanoplates;carbon nanotubes;aerogel;organic dyes;adsorption
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Long Chen,Hongjun Zhou,Li Hao,Ziyong Li,Hua Xu,Huayao Chen,Xinhua Zhou
In order to increase insecticidal activity by generating zein nanoparticles, zein was modified by dialdehyde carboxymethyl cellulose (DCMC), making a conjugate (Z-DCMC) that is more hydrophilic than zein. The conjugate was used as a water-based nanocarrier for pesticides. Specifically, in this study the model drug avermectin (AVM) was encapsulated though hydrophobic interactions with the conjugate. The oxidation of carboxymethyl cellulose to form DCMC, and the reaction between zein and DCMC were confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis, and SDS-PAGE. Scanning electron microscopy and dynamic light scattering showed that the drug-loaded nanoparticles have an average particle size of 68 nm. The release of AVM was found to be responsive to pH, with the release rate in neutral conditions being faster than in acidic or alkaline conditions. AVM encapsulated in Z-DCMC ( [email protected] ) exhibits higher wettability, with leaf retention increasing from 11.44 to 16.15 mg/cm 2 compared to non-encapsulated AVM. Z-DCMC protects AVM from UV light, with 81.23 % of the encapsulated AVM remaining intact after exposure to UV for 195 min, compared to less than 20 % for the bare AVM. More importantly, [email protected] enhances the insecticidal activity, with the LC 50 decreasing from 199.89–106.41 mg/L after encapsulation.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 8
·4471-4485
·
IF 4.21
Wan Yizao,Lin Zhonghong,Zhang Quanchao,Gan Deqiang,Gama Miguel,Tu Junpin,Luo Honglin
Abstract The impact of graphene oxide (GO) on normal cells has been widely investigated. However, much less is known on its effect on cancer cells. Herein, GO nanosheets were incorporated into electrospun cellulose acetate (CA) microfibers. The GO-incorporated CA (GO/CA) microfibers were combined with bacterial cellulose (BC) nanofibers via in situ biosynthesis to obtain the nano-microfibrous scaffolds. The GO/CA–BC scaffolds were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The GO/CA–BC scaffolds were used for breast cancer cell culture to evaluate the effect of GO on cancer cell behavior. Fluorescence images revealed large multicellular clusters on the surface of GO/CA–BC scaffolds. Compared to the bare CA–BC scaffold, the GO/CA–BC scaffolds not only showed enhanced mechanical properties but also improved cell proliferation. It is expected that the GO/CA–BC scaffolds would provide a suitable microenvironment for the culture of cancer cells which is necessary for drug screening and cell biology study. Graphic abstract
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2020
·Vol. 4
·期 7
·2000042
·
IF 4.869
Huazheng Sai,Zhiqiang Jin,Yutong Wang,Rui Fu,Yaxiong Wang,Litong Ma
The separation of oil–water mixtures by membranes with hydrophilicity and underwater superoleophobicity is an effective method. However, the fabrication of these oil–water separation membranes usually needs a complex chemical treatment process. In this study, a facile and green method to fabricate bacterial cellulose membranes (BCMs) with superwettability through one-step filtration process without any further tedious and costly chemical modification for efficient oil–water separation is proposed. Owing to the ultrafine (20–80 nm in diameter) nanofiber structure and intrinsic hydrophilicity of bacterial cellulose (BC), BCMs with a 3D web-like structure show superhydrophilicity in air (water contact angles about 0°) and underwater superoleophobicity (oils contact angles >150°). During the oil–water separation process, water permeates through BCMs quickly while oils remain at the BCMs' upper side. Furthermore, all separation processes present high separation efficiency (>99.7%) and high fluxes. In addition, two different models are proposed to describe the formation and microstructure of BCMs and how it affect the separation process. Thus, this work provides a facile and environment benign route for obtaining excellent separation membranes for oil-polluted-water treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 17
·7417-7431
·
IF 3.553
Meng Xingtong,Jia Shuai,Mo Lanlan,Wei Jie,Wang Feijun,Shao Ziqiang
Nowadays, it has become a trend to prepare porous carbon as electrode materials for supercapacitors by using biomass and its derivatives by virtue of its low cost, abundant source and environmental friendliness. Carboxymethyl cellulose ammonium (CMC-NH 4 ), a kind of cellulose derivative, is used as a carbon precursor and O/N source to prepare carbon material through cross-linking with aluminum ions, lyophilization, carbonization and activation. The as-prepared O/N-co-doped carbon samples (ONAC-500, ONAC-600 and ONAC-700) exhibit hierarchically porous structure with different size pores in carbon framework, ensuring electrolyte ions effective transport and diffusion. Meanwhile, the ONAC-600 reveals a high specific surface area of 2658 m 2 g −1 , abundantly porous structure with pore volume of 1.32 cm 3 g −1 and effective O/N-doping, which ensure a high capacitance of 465.0 F g −1 at 1 A g −1 in 3 M KOH three-electrode system. It also shows better rate capability and good stability after 10000 cycled under 10 A g −1 . Besides, the assembled all-solid-state supercapacitor with ONAC-600 delivers an acceptable energy density of 7.8 Wh kg −1 at a power density of 124.2 W kg −1 .
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Shujuan Yang,Tianhao Wang,Rong Tang,Qinglin Yan,Weiqian Tian,Liping Zhang
Cellulose acetate (CA) ultrafiltration membranes are attracting more attention in wastewater purification due to its biodegradability and eco-friendly. The application of CA membranes, however, is limited by high susceptibility to bacterial corrosion and lack of mechanical tolerance that results in loss of life. To solve the above problems, we first fabricated the CA-based composite membranes incorporated with bamboo-based lignocellulose nanofibrils (LCNFs) by a strategy of phase inversion. LCNFs was prepared by using a combined method of one-step chemical pretreatment and acid hydrolysis coupled with high-pressure homogenization. The as-prepared CA/LCNFs composite membranes with 4 wt% lignin in the LCNFs exhibited high tensile strength of 7.08 MPa and strain-at-break of 12.21%, and high filtration permeability of 188.23 L·m −2 ·h −1 as ultrafiltration membranes for wastewater treatment, which could obviously inhibit the growth of Escherichia coli .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Kaiwei Zhang,Songming Zheng,Yuqing Liu,Jinyou Lin
Cellulose nanofibrils (CNF) is a natural nanomaterial composed of biomacromolecules that can be extracted from plants and has great potential applications in many fields due to its excellent regenerative, sustainable, and biodegradable properties. In this work, the flax CNF with hierarchical scales was obtained by using the flax fibers (FF) treated with different concentrations of alkaline solution, followed by the TEMPO-mediated ternary oxidation and mechanical treatment. Subsequently, the resultant CNF was implanted on the commercial filter paper as a surface barrier for oil/water preparation. The changes of cellulose crystal form and crystallinity caused by alkali treatment on FF were studied by Fourier transform infrared spectroscopy and X-ray diffraction. Morphological changes of FF before and after alkali treatment were observed. The morphology of obtained CNF was examined. Moreover, the transmittance of the prepared CNF suspension and films was also investigated by a UV spectroscopy . The prepared modified filter paper can effectively separate the oil/water mixture, which gives themselves promise as candidates in practical applications of oil/water separation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）