Frontiers in Bioengineering and Biotechnology
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2021
·
IF 5.89
Wu Yan,Zhao Wanying,Wu Xinyu,Gan Jian,Zhang Haiqiao,Cai Yijing
The moso bamboo fiber powder was used as raw material to prepare cellulose nano-fibril films, 5% of polyvinyl alcohol solution was used as a structural reinforcement agent, dopamine hydrochloride (DA) was used as a surface adhesive, and hexadecyl trimethoxy silane was used as a surface modifier. The superhydrophobic films were prepared by vacuum filtration and impregnation. The results showed that the water contact angle on the surface of the film could reach 156°. The microstructure and chemical composition of the film surface was further studied by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), and roughness measurement The scanning electron microscopy images showed that the nanofibers on the surface of Cellulose nanofibers film were arranged and randomly distributed, thus forming a dense network interwoven structure. In PDA hydrophobic modification solution, an Hexadecyltrimethoxysilane was hydrolyzed to a hexadecyl silanol to obtain the polar terminal hydroxyl of Hexadecyl silanol molecule. The -OCH3 terminal group of HDTMS reacted with hydroxyl/H2O to form a silanol (Si-OH) bond and further condensed to form a Si-O-Si network. In addition, due to the hydrophilicity of the surface of the nano cellulose film, a large amount of—OH was adsorbed on the surface of the nano cellulose film, resulted in the chemical connection between cetyl groups, thus realized the grafting of cetyl long-chain alkyl groups onto the fibers of the nano cellulose film.The film showed good self-cleaning and waterproof properties, which can be widely used in wet environment packaging and building.
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COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Mantang He,Md. Kowsar Alam,Huijie Liu,Maorong Zheng,Junqi Zhao,Liming Wang,Li Liu,Xiaohong Qin,Jianyong Yu
Cellulose based aerogels have been deemed as promising candidates for solar steam generation owing to their renewable biopolymer resources and interconnected microporous features. To find an environmentally friendly way to obtain cellulose nanofiber and prepare aerogel-based evaporator is a practical demand. Here, a stable and sustainable cellulose composite aerogel based solar steam generator derived from waste cotton fabrics is reported. The fabricated polyethyleneimine crosslinked carbon nanotubes/cellulose nanofibers (PEI@CNTs/CNFs) aerogel shows a high solar steam generation rate of 1.9 kg m -2 h -1 with the light-to-vapor efficiency of 91.4% under 1 sun illumination. In addition, the evaporator can guarantee sustainable and stable solar steam generation performance after long-term test. Moreover, the solar steam generator can purify a variety of wastewater, e. g. dye wastewater, heavy metal ion wastewater, and seawater. These futures make the designed cellulose based composite aerogel offer an efficient way for solar-driven water purification, regeneration, and desalination.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Xiaolei Luo,Junyan Shen,Yanan Ma,Lin Liu,Ranju Meng,Juming Yao
Robust and sustainable cellulose composite aerogels were prepared by incorporating MgAl-layered double hydroxide (MgAl-LDH) as green nanofillers and flame retardants. Two series of aerogels combining MgAl-CO 3 LDH (MA-C) and MgAl-H 2 PO 4 LDH (MA-P) were achieved, in which both MA-C and MA-P were uniformly dispersed in cellulose substances. The cellulose composite aerogels with 1.8 wt% of MA-C (denoted as CAC) and MA-P (denoted as CAP) displayed excellent mechanical properties, increased by 2.6 and 2.8 times compared with neat cellulose aerogels (CA), respectively. The peak of heat release rate (PHRR) of CAC and CAP reduced by 41 % and 50 % compared with the neat one, respectively, demonstrating the outstanding flame retardancy. The reduction in smoke production ratio (SPR) was 79 % for CAC and 75 % for CAP, respectively, indicating enhanced smoke suppression performance. Therefore, the high performance flame-retardant cellulose composite aerogels exhibit an application prospect in green advanced engineering field.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ruiping Tong,Guangxue Chen,Junfei Tian,Minghui He
Developing green substrates based on cellulose to substitute synthetic plastics meet the requirement for the sustainable future. However, cellulose-based substrates supporting for building electronic devices are usually opaque and highly hydrophilic, which ultimately limits the performance of optoelectronic devices. Herein, we report a new avenue for fabrication of highly transparent, weakly hydrophilic and biodegradable cellulose film. The acquired cellulose film not only has high transparency (over 90%), but also displays weak hydrophilicity (∼79° of initial water-contact angle) and still remains 3.5 MPa of tensile strength after soaking for two days in deionized water. Additionally, the degradation half-life of cellulose film is 20 days, and the cellulose films also have better thermostability. Moreover, the flexible electroluminescent devices have been successfully constructed by using this cellulose film as a green substrate. This novel strategy will greatly enrich the applications of cellulose films for next generation green electronics.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Qiang-Qiang Zhang,Ying-Jie Zhu,Jin Wu,Li-Ying Dong
A filter paper with a large number of nanopores and channels is vital for highly efficient nanofiltration to significantly increase the water flux without sacrificing the separation efficiency. In this work, we report a new kind of nanofiltration filter paper consisting of a cellulose nanofiber (CNF) barrier layer on the cellulose fiber (CF)/ultralong hydroxyapatite nanowire (HAPNW) substrate. The CF/HAPNW filter paper and CNF/HAPNW filter paper can be prepared by a simple papermaking process including filtration, hot pressing, and drying. The porous network formed by the interweaving of CFs and HAPNWs provides vital channels for rapid water transportation. The experiments indicate that the pure water flux (PWF) of the CF/HAPNW filter paper is as high as 544.4 L m–2 h–1 bar–1, which is about 50 times that of the CNF/HAPNW filter paper. Compared with the nanofiltration filter paper based on the CNF/HAPNW substrate, the PWF of the CNF–CF/HAPNW nanofiltration filter paper can be enhanced by 20% with rejection rates above 95% for four different dyes. Moreover, the CNF–CF/HAPNW nanofiltration filter paper shows a relatively high rejection rate for Na2SO4 (75.7%) and NaCl (65.8%). The high PWF and excellent water filtration performance make the as-prepared CNF–CF/HAPNW nanofiltration filter paper promising for application in water purification.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yan-Yan Xie,Xiao-Hui Hu,Yan-Wen Zhang,Fazli Wahid,Li-Qiang Chu,Shi-Ru Jia,Cheng Zhong
The absence of antibacterial activity of bacterial cellulose (BC) restricts its applications in the biomedical field. To introduce antimicrobial properties into BC, we studied the synthesis, structure, and antimicrobial properties of a novel nanocomposite film comprising BC, graphene oxide (GO), and copper-oxide (CuO) nanosheets. The nanocomposite film was synthesized by incorporating GO-CuO nanohybrids into BC matrix through homogenized blending. The CuO nanosheets, with a length range of 50 nm–200 nm and width range of 20 nm–50 nm, which were uniformly grown on the GO along with even distribution of GO-CuO nanohybrids on the surface of the cellulose fibers. The nanocomposites displayed better antibacterial activity against gram-positive than gram-negative bacteria. BC/GO-CuO nanocomposites showed higher antibacterial activity than BC/CuO. We also elucidated the mechanism of antibacterial activity of the nanocomposites. Further, the nanocomposites exhibited biocompatibility towards mice fibroblast cells. The nanocomposites might serve as an excellent source for development of antibacterial materials.
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ENERGY & FUELS
·
2019
·
IF 3.021
Mengxiang Gan,Guoqing Yang,Zhihan Wang,Xiaofeng Sui,Yu Hou
Oxidative desulfurization (ODS) is a promising method to remove the heterocyclic sulfur compounds from fuel and such process need high-performance catalysts. Polyoxometalates (POMs) have been proven to be excellent catalysts in the ODS reaction, which need to be immobilized on carriers to realize its industrial application. In this work, [β-SiMo3W9O40]n− has been loaded on a sustainable cellulose nanofiber (CNF)-based material, which was then calcined at 400 °C to form an POM-based composite material. CNF was modified by γ-(2,3-epoxypropoxy)propyltrimethoxysilane (GPTMS) and polyethyleneimine (PEI) so that the polyanions and protonated PEI could effectively interact with each other; therefore, POM could be well supported on the carrier. The catalytic results showed that in model oil with the sulfur concentration being 2000 ppm, the removal efficiency of dibenzothiophene, benzothiophene, and 4,6-dimethyldibenzothiophene were 99, 89, and 100%, respectively. In addition, infrared spectra analysis indicated the stability of the catalyst after it was recycled. This work provides a new method to obtain effective heterogeneous ODS catalysts by employing an eco-friendly CNF as raw materials.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Dalin Hu,Haoyu huang,Ran Jiang,Nan Wang,Hongping Xu,Yang-Guang Wang,Xiao-kun Ouyang
Residual diclofenac sodium (DS) in the environment is harmful to human health. A promising method for DS removal is the use of adsorbents functionalized with amino groups that can form an ionic bond with the carboxyl group of DS at a suitable pH. In this work, a novel composite adsorbent composed of cellulose nanocrystals (CNC) and chitosan (CS) has been synthesized and functionalized by ethylenediamine (ED) in both layers. Characterization methods, including scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectrometry, and X-ray photoelectron spectroscopy, were used to confirm the morphology and synthetic mechanism of the double- amino-functionalized adsorbent. Based on the optimization of adsorption conditions and modeling of the adsorption mechanism, the DS adsorption process on CNC-ED@CS-ED involves chemical adsorption, and the maximum adsorption capacity obtained from the Langmuir model is 444.44 mg/g. CNC-ED@CS-ED exhibits good adsorption capacity and high sustainability; thus, it is a promising composite material for the removal of DS from wastewater.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
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IF 7.015
Wei Yu,Di Song,Aimin Li,Hu Yang
The mitigation of gypsum scaling on reverse osmosis (RO) membrane using carboxymethyl cellulose (CMC) as a green antiscalant was investigated in this study. Static test was conducted to pre-evaluate the inhibition performance and mechanism against gypsum scale using optical microscope and X-ray diffraction (XRD) as auxiliary analysis methods. The antiscaling effects in the RO system were investigated by flux change measurement and membrane surface observation. Results from the static test and RO operation indicated that a suitable degree of carboxymethyl substitution and an appropriate dose were both necessary for CMC to achieve satisfactory inhibition performance. Analysis from optical microscope and XRD showed obvious changes in crystal size and surface morphology of gypsum scales using CMC as antiscalant, which indicated that the effects of chelation, dispersion, and lattice distortion were all involved. In the RO operation, permeate fluxes in the presence of CMC remain relatively constant in gypsum-dominated solution compared with the sharp flux drop in the blank test. Coexisting anions, such as CO 3 2− and PO 4 3− , nearly had no influence on the antiscaling effect of CMC in the RO operation. Direct observation of RO membrane surface under scanning electron microscopy indicated that only a thin layer that contained few deposits was found when CMC was used. However, a thick crystal layer completely covered the membrane surface for the antiscalant-free test. Thus, CMC is an efficient and environmentally friendly antiscalant with remarkable potentials for membrane fouling control in RO operation.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ling-Kun Zhang,Shiwei Du,Xiaozhen Wang,Yuxuan Jiao,Liang Yin,Yi Zhang,Yan-Qing Guan
Nanotherapies combined with stimuli-triggered activated agents have become attractive ways to traditional chemotherapy. The Fe 3 O 4 nanoparticles was employed as the core coated firstly with hydrogels of dually loaded both doxorubicin and hematoporphyrin monomethyl ether. Then, the folic acid was grafted onto the surface of the composites to construct a laser-sensitized magnetic nanoparticles (LMNs), followed by these LMNs being loaded into BC membrane. On the 14th day after treatment, tumor growth inhibition (TGI) was evaluated to 80.38% under the target system. When delivered transdermally under a magnetic field and laser, the synthesized BC/LMNs could offer solutions to challenge in breast cancer treatment, including the limited penetration depth, which could facilitate the bypassing of the stratum corneum barrier and enhance transdermal drug delivery.
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RSC Advances
·
2019
·Vol. 9
·期 17
·9348-9353
·
IF 3.049
Xiaojuan Ma,Qidu Deng,Lu Wang,Xin Zheng,Shunshun Wang,Qinhua Wang,Lihui Chen,Liulian Huang,Xinhua Ouyang,Shilin Cao
A transparent conductive Ag nanowire (AgNW)-regenerated cellulose film (RCF) was prepared and has been proposed to be used as an anode for perovskite solar cells. The HNO3 treatment was used for solving the dilemma between optical transparency and conductivity caused by the AgNW introduction; in addition, the bonding strength between AgNWs and cellulose film was enhanced substantially via HNO3 treatment. Accordingly, the AgNW-RCF with a AgNW size of 15 μm × 85 nm and density of 0.36 g m−2 shows impressive conductivity and transparency, with a sheet resistance of 29 Ω □−1 and a transmittance of 80% at a wavelength of 550 nm. Perovskite solar cells incorporating such AgNW-RCF anodes exhibited a cell performance with a Voc of 1.02 V, Jsc of 9.58 mA cm−2, FF of 45.8% and PCE of 4.49%.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 8
·1-15
·
IF 1.784
Yang Lu,Sun Zhuangzhi,Li Fei,Du Shanqi,Song Wenlong
To enhance the performance of ionic actuators, the electrochemical and electromechanical properties of green ionic actuators with the electrolyte layer after doping with MWCNT was investigated in this paper. The surface morphology, elemental composition, corresponding content and functional group of the mixed electrolyte layer were observed and characterized by SEM–EDS, FT-IR and XRD. The CV test showed that when the doping amount was 0.8 wt%, the specific capacitance increases 187.6% and 205.3% compared with undoped electrolyte layer at the sweep speed of 20 mV s −1 ,500 mV s −1 , respectively. The GCD test showed that the energy density increased to 144.3% at the current density of 1 A g −1 . and the cycle life is correspondingly increased. At 5 V DC, the deflection displacement of actuators was 10.12 mm when the doping amount was 0.8 wt%, which was 238.1% higher than when the doping amount was 1.5 wt%. And the output force of actuators was 3.10 mN, which was 147.2% higher than when the doping amount was 0 wt%. At 5 V/0.05 Hz voltage, the peak displacement of the actuator was 2.871 mm, which was 238.1% higher than when the doping amount was 1.5 wt%.
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