ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Shaohuang Chen,Ning Ren,Mei Cui,Renliang Huang,Wei Qi,Zhimin He,Rongxin Su
Phosphorylated cellulose nanofibrils (PCNFs) made from woody biomass have aroused immense interest because of their promising applications in various fields, including flame retardancy, adsorption, and separation. However, traditional production methods show high chemical and energy consumption, while the obtained PCNFs have lower charge density. In this study, PCNFs with higher charge density (2.09–3.79 mmol·g–1) were produced by tuning heat soaking pretreatment of cellulose fibers in phosphate salt and urea solutions, followed by curing and mechanical fibrillation. An optimized pretreatment can be achieved by heat-assisted soaking at 80 °C for 25 min, which was effective to produce PCNFs with greater performance (e.g., higher charge and crystallinity) compared to those of traditional methods. Furthermore, the optimized route is more sustainable with a substantial decrease in resource consumption including chemicals (33.6%), water (55.8%), and energy (65.3%), and the production costs would be saved by 62.0% in comparison with the traditional route. Such a sustainable and economic process has great potential in the industrial production of PCNFs.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Zuozhu Yin,Min Li,Zhiwei Chen,Xiaoxiang Chen,Kaiyuan Liu,Dongpeng Zhou,Mingshan Xue,Junfei Ou,Yu Xie,Sheng Lei,Chan Xie,Yidan Luo
Bio-based membranes for removing organic dye and microorganism-containing complicated oil-water effluents simultaneously are sustainable, low-cost, renewable, biodegradable, and nontoxic. Here, a robust, sustainable and molecular-level superhydrophobic Pulp/cellulose nanofiber (CNF) composite membrane (SPCCM) via crosslinking of nanofibers and coating ZnO suspensions for accomplishing this purpose is proposed. The results show that this designed SPCCM has superior superhydrophobicity (water contact angle: 163 ± 2°) and superoleophilicity (oil contact angle: 0 °), which has a great separation efficiency for separating oil-water mixture (92 %) and a high flux (1435 L·m −2 ·h −1 ·bar −1 ). Moreover, SPCCM showed good durability in harsh environment (such as: bending, corrosion solution, temperature, etc). It also showed that the synergistic impact of electrostatic adsorption and ZnO photocatalyst is responsible for the high degradation capacity (Degradation under visible light using 300 w xenon lamp, high degradation efficiency up to 98 %). Furthermore, the SPCCM had a high level of anti-biofouling for microorganisms. Thus, the SPCCM mainly derived from sustainable pulp fibers showed potential performance for oil/water separation and water purification .
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CELLULOSE
·
2022
·Vol. 29
·期 15
·8293-8303
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IF 6.123
Yue Shuangshuang,Wang Shuanjin,Han Dongmei,Huang Sheng,Xiao Min,Meng Yuezhong
A transparent perhydropolysilazane-derived-SiO x coated cellulose film with high gas barrier properties was fabricated via a facile solution dip-coating followed by UV curing method. The conversion of perhydropolysilazane to SiO x was proved by ATR-FTIR, XPS and TOF–SIMS characterizations. AFM and SEM images revealed the smoothness of the coating and good adhesion between the cellulose substrate and the coating. The thickness of the SiO x coating (50–450 nm) can be tuned by changing the concentration of the perhydropolysilazane precursor solution. The cellulose film (35 µm in thickness) with 450 nm thick SiO x coating exhibits low oxygen transmission rate (OTR) value of 0.82 cm 3 /m 2 ·day and water vapor transmission rate (WVTR) value of 1.28 g/m 2 ·day. The excellent oxygen and water vapor barrier properties, ultrahigh transparency and complete biodegradability of the SiO x coated cellulose film endow it competitive potential for packaging applications. Graphical abstract A transparent perhydropolysilazane-derived-SiO x layer is tightly coated on a cellulose film via a facile solution dip-coating followed by UV curing method. The sandwich structured cellulose-SiO x films show excellent oxygen and water vapor barrier properties as well as ultrahigh transparency and complete biodegradability, which has a great potential for food, medicine and other packaging applications.
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Small
·
2022
·Vol. 18
·期 34
·2202405
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IF 15.153
Hong Li,Zhuzhu Xiong,Yi Jia,Fan Gao,Chenlei Wang,Qi Li,Junbai Li
The development of high-efficiency enzyme mimics is of great significance in the field of biocatalysis. However, it remains challenging to design novel enzyme mimics with multiple enzyme-like activities, excellent stability, and good reusability. Herein, a facile molecular assembly strategy to construct dialdehyde cellulose (DAC) templated Cu-doped polydopamine (DAC@PDA/Cu) membrane with dual enzyme-like activities is presented. The Schiff base bonds formed between polydopamine (PDA) and DAC can not only accelerate the adhesion of PDA thin layer but also contribute to Cu-loading and high stability of DAC@PDA/Cu membrane. Importantly, the assembled DAC@PDA/Cu membrane exhibits a remarkable catalytic activity that is superior to the natural laccase along with high stability and excellent reusability. Moreover, the DAC@PDA/Cu membrane also demonstrates peroxidase-like activity, and it is successfully applied in the sensitive detection of ascorbic acid (AA). This work will provide a new paradigm methodology for rational design and practical applications of enzyme mimics based on bioinspired molecular assemblies.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Junyu Jian,Yitong Xie,Shishuai Gao,Yu Sun,Chenhuan Lai,Jifu Wang,Chunpeng Wang,Fuxiang Chu,Daihui Zhang
With the development of wearable devices, the fabrication of strong, tough, antibacterial, and conductive hydrogels for sensor applications is necessary but remains challenging. Here, a skin-inspired biomimetic strategy integrated with in-situ reduction has been proposed. The self-assembly of cellulose to generate a cellulose skeleton was essential to realize the biomimetic structural design. Furthermore, in-situ generation of silver nanoparticles on the skeleton was easily achieved by a heating process. This process not only offered the excellent antibacterial property to hydrogels, but also improved the mechanical properties of hydrogels due to the elimination of negative effect of silver nanoparticles aggregation. The highest tensile strength and toughness could reach 2.0 MPa and 11.95 MJ/m 3 , respectively. Moreover, a high detection range (up to 1300%) and sensitivity (gauge factor = 4.4) was observed as the strain sensors. This study provides a new horizon to fabricate strong, tough and functional hydrogels for various applications in the future.
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ENERGY
·
2022
·
IF 8.857
Yi Wei,Licong Lu,Xudong Zhang,Jianbing Ji
Cellulose was used as feedstock to investigate the effect of electrolysis on the molten salt pyrolysis process . The mechanism of cellulose transformation in the electrochemically assisted molten carbonate pyrolysis (EMCP) system was evaluated by comparison with the molten carbonate pyrolysis (MCP) system. The gas product yield from the EMCP system reached 70.5 wt%, at the expense of the liquid product and tar. The maximum H 2 yields up to 8.31 mol/kg of cellulose at low temperatures without the catalyst in the EMCP system. Cellulose decomposition was catalyzed by the molten salt to produce a large number of volatiles, where the aldehyde groups in the volatiles were electrochemically oxidized to carboxyl groups. Subsequently, the carboxyl compounds combined with alkali metal cations to release hydrogen radicals and then underwent secondary cracking, along with the volatiles having low chemical bond energies. The EMCP system follows the Shrink Cylinder model, which is dominated by the two-dimensional reaction on the surface of the graphite electrode , where the electrolysis process is the determining step.
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FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Guangni Peng,Defeng Wu
Rod-like polysaccharide particles such as chitin nanocrystals (ChNCs) and cellulose nanocrystals (CNCs) have been widely used for the preparation of Pickering emulsion . Both are believed playing good role of particle emulsifiers. However, these two kinds of nanocrystals have completely different surface properties: electronegative CNC is more hydrophilic and has higher surface charge level as compared to electropositive ChNC. To reveal their difference as emulsifiers in Pickering emulsions is therefore of interest. In this work, ChNCs and CNCs with the same structural parameters (aspect ratio = 28) were used to prepare olive oil- in -water emulsions for a comparative study. The two kinds of nanocrystals show the same mechanical state in emulsions, behaving like rigid rods, instead flexible fibers because they have 10 4 level of effective stiffness. Therefore, their roles of emulsifying oil/water system are dominated by their surface properties: ChNCs reveal higher emulsifying capacity relative to CNCs due to better ChNC-oil affinity, and can even emulsify the oil/water (7/3 w/w) system with high oil fractions. However, ChNC-stabilized emulsions are not that stable to centrifugation as compared to CNC-stabilized emulsions at low oil fractions due to the formation of the cluster structure resulted from less coating of droplets. Thus, the former reveals higher strain sensitivity and stronger thixotropy than the latter in shear flow. The correlation between viscoelasticity and morphology/phase behavior of the two kinds of Pickering systems was assessed, then. This work provides valuable information on formulating preparation of Pickering emulsions by using different types of rod-like polysaccharide nanocrystals.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Wenting Zhang,Yuankun Wang,Defeng Wu
Discriminating the roles of different networks in the multiply cross-linked hydrogels is vital to optimize their overall performance. Poly(vinyl alcohol)/cellulose nanofiber composite hydrogels were used as template for the study. Three types of characteristic networks, including chemical network cross-linked with boronic ester bonds, physical network cross-linked with microcrystallites , and coexistence of these two networks, were constructed in the system, and the viscoelastic responses were used to detect the characteristic relaxation behavior of those networks. The physical network is more sensitive to stress-induced deformation, whereas the chemical network more sensitive to strain-induced one. The former has lower level of viscous dissipation and higher level of elastic storage as compared to the latter, and dominates linear viscoelasticity of hydrogels as the two networks coexist. Their synergistic effect can be well defined by the scaling behavior of hysteretic work. This work proposes an interesting method of probing networks in the multiply cross-linked hydrogels.
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Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Jianming Wu,Zihui Dong,Xiuping Li,Peng Li,Jiedong Wei,Mei Hu,Lihong Geng,Xiangfang Peng
Facing the serious environmental problem caused by water pollution , it is still challenging to develop a kind of acidic wastewater treatment adsorbent with high adsorption efficiency. In this study, the negative charged cellulose nanofibrils (CNF) were used to enhance the acid-resistance of the positive charged chitosan (CTS) via both ionic and hydrogen-bonding crosslinking interactions. The prepared CTS/CNF composite membrane presented an excellent acid-resistant property (approximately 95% acid-resistant degree) and 14.71 mg/g of adsorption capacity for methylene blue in the strong acidic environment (pH = 1.22), surpassing almost reported adsorbents. Besides, the adsorption process for methylene blue conformed to the pseudo-first-order kinetic model and the Langmuir isotherm model better. Furthermore, the obtained CTS/CNF composite membrane presented excellent recyclability (about 85% desorption rate) after five recycles of adsorption-desorption. Consequently, as a novel and efficient adsorbent, the CTS/CNF composite membrane showed an outstanding application potential in the treatment of acidic wastewater.
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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Qianqian Liang,Dong Zhang,Yuchen Wu,Shiyan Chen,Zhiliang Han,Baoxiu Wang,Huaping Wang
Liquid sensors for detecting water and body fluids are crucial in daily water usage and health monitoring, but it is challenging to combine sensing performance with high tensile deformation and multifunctional applications. Here, a substrate-free, self-stretchable bacterial cellulose (BC)/carbon nanotube (CNT) helical fiber liquid sensor was prepared by the solution spinning and coiling process using BC as the water-sensitive matrix and CNTs as the active sensing materials. The BC/CNT (BCT) fiber sensor has a high stretch ratio of more than 1000% and a rapid response for a current change rate of 104% within 1 s, which is almost unaffected under washing and various stretching or knotting deformations. By combination of the BCT fiber, we can design smart diapers or water level detectors, which rapidly monitor the status of smart diapers or water level, and the monitoring result can be transferred on time through an alarm device or smartphone. In short, the scalable and continuous preparation of the self-stretchable BCT helical fiber will provide a capacious platform for the development of a wearable sensor applied in daily life (such as smart diapers, water level detection, etc.)
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Biofuels Bioproducts & Biorefining-Biofpr
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2022
·Vol. 17
·期 2
·355-362
·
IF 5.239
Yanqian Gu,Shasha Liu,Gang Wu,Yinlong Wu,Shoujun Zhang,Yong Huang,Shu Zhang,Hong Zhang
Biomass is the sole carbon-containing renewable resource on Earth, and has high potential for the production of platform chemicals. Phenol, one of the most important platform chemicals, is generally derived from lignin conversion. In this study, the production of phenol from co-pyrolysis of cellulose and sodium borohydride at different mass ratios is investigated in detail. The results show that even a small amount of sodium borohydride (cellulose–sodium borohydride = 10:1) could effectively promote the conversion of cellulose to phenol through cellulose-derived levoglucosan intermediates. As the mass ratio of cellulose–sodium borohydride decreased, the relative content of phenol in the products significantly increased, and could be as high as 11.0% when the ratio of cellulose to sodium borohydride was 2:1. Glycosidic bonds in cellulose were considered to play an important role in its catalytic conversion. Furthermore, the resulting solid product could be used as a B-doping carbon material, which is desirable in various research fields. This study provided a novel method for the highly efficient utilization of cellulose. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xindong Chen,Hailong Li,Shimiao Yao,Can Wang,Xuefang Chen,Haijun Guo,Lian Xiong,Hairong Zhang,Xinde Chen
Lignin is regarded as the primary factor that inhibits enzymatic hydrolysis of cellulose . However, the impact of cellulose ultrastructure on the inhibition of lignin during enzymatic hydrolysis is still unclear. In this work, the addition of lignin during enzymatic hydrolysis of cellulose with different ultrastructure was investigated. Furthermore, the influences of changing cellulose ultrastructure on cellulose conversion of pine after hydrothermal treatment (HT) without and with additives (2-naphthol (2 N) and phloroglucinol (PL)) were explored in detail. The results showed that enzymatic hydrolyzability of allomorphic cellulose was strongly inhibited by lignin. In contrast, a small inhibition degree of lignin was observed for amorphous cellulose. Surprisingly, the cellulose conversion of HT treated pine was dramatically decreased (18.45–6.25%) after ball-milling treatment (BM), while it was significantly increased (18.45–74.49%) after concentrated phosphoric acid treatment (CP). In addition, the addition of 2 N or PL during HT could promote or inhibit cellulose conversion due to the changes in the condensation degree of lignin. These results indicated that the physiochemical structure of lignin has a significant effect on cellulose hydrolysis. More importantly, the increasing degree of cellulose conversion was enhanced in sequence from HT+PL (6.19–35.00%), HT (18.45–74.49%), to HT+ 2 N (21.12–92.30%) after CP, which was attributed to the reducing lignin condensation and changing cellulose ultrastructure. Overall, this work demonstrated that the inhibition degree of lignin was highly dependent on the cellulose ultrastructure.
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危险品化学品经营许可证（带存储）