NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 36
·17358-17366
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IF 3.925
Xudong Zheng,Ang Li,Jie Hua,Yuzhe Zhang,Jian Rong,Jinfeng Mei,Man Zhou,Zhongyu Li
The vigorous development of rare earth elements has become particularly important for the recycling and reuse of rare earth waste solutions. We use the specific coordination of the phosphate group and La3+ to recover and separate La3+ from secondary resources. First of all, cellulose nanocrystals should be phosphorylated by using phosphoric acid in an aqueous medium. Phosphoric acid groups are introduced to the surface of the cellulose nanocrystal, and then poly-N-isopropylacrylamide is introduced for modification. The purpose is to increase the mechanical properties of the material. The material was characterized by scanning electron microscope, transmission electron microscope, Fourier infrared spectroscopy, N2 adsorption–desorption analysis, and thermogravimetric and static adsorption experiments. The results of the static adsorption experiments show that the maximum adsorption capacity is 92.28 mg g−1 when the pH is 7.0. After recycling the material five times, the material could still have 87.24% of the maximum adsorption capacity.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Xue Shi,Xiaoli Qin,Yunxiang Dai,Xiong Liu,Weifei Wang,Jinfeng Zhong
The catalytic activity of Candida antarctica lipase B (CALB) immobilized on modified cellulose nanocrystals (CNC) with different hydrophobicity was investigated using experimental and theoretical approaches. Firstly, the modified CNC were characterized by multi-spectroscopic methods, water contact angle, scanning electron microscopy and thermogravimetric analysis. Moderately hydrophobic CNC were found to be an optimal support for CALB immobilization. Secondly, model systems contained a CALB molecule and different numbers of modified CNC molecules ( [email protected] , [email protected] and [email protected] ) were prepared for molecular dynamics (MD) simulation. Root-mean-square fluctuation values (0.61–2.61 Å) of lid region were relatively high in [email protected] , indicating that modified CNC with moderate hydrophobicity favored forming a lid-open conformation of CALB. Finally, the esterification of oleic acid catalyzed by the immobilized CALB showed higher conversion (54.68 %) than free CALB (12.98 %). Insights into modified CNC with tunable properties provided by this study may be a potential support for improving the catalytic performance of lipases.
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PubMed
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2022
·
IF 6.437
Koïta Djakaria,Ziyue Tang,Jingai Shao,Xu Chen,Haoyu Xiao,Joseph Smith,Haiping Yang,Hanping Chen
Furfural is one of the top valuable building block chemicals, the selective production of furfural from biomass has attracted increasing concerns in recent years. In this work, a novel method for the selective production of furfural through cellulose catalytic pyrolysis with WO 3 /γ-Al 2 O 3 was reported, and the synergistic effect between γ-Al 2 O 3 and WO 3 was explored. Compared with cellulose pyrolysis alone, the addition of γ-Al 2 O 3 improved the selectivity of furans and greatly inhibited the formation of sugars; while, WO 3 addition promoted the formation of levoglucosenone . When (20–40%) WO 3 /γ-Al 2 O 3 were added, the amount of sugars was further reduced, and the yields of furans (furfural and 2-methylfuran, in particular) were further increased at the same time. Under the optimum conditions (temperature = 600 °C, residence time = 15 s, and catalyst to cellulose mass ratio of 4), 30%WO 3 /γ-Al 2 O 3 showed the best performance, and the selectivity and yield of furfural were improved by nearly 100% and 300%, respectively, as compared with cellulose pyrolysis alone. In addition, compared with γ-Al 2 O 3 , the addition of 30%WO 3 /γ-Al 2 O 3 further increased the yield of furfural and 2-methylfuran to about 50% and 200%, respectively. The high selectivity and yields of furans with WO 3 /γ-Al 2 O 3 addition might be due to that WO 3 crystals in the composite promote the formation of levoglucosenone, which is further converted to additional furans through the Lewis acid sites of γ-Al 2 O 3 . The study may provide some meaningful advices for improving the production of furfural from green catalytic pyrolysis of cellulose.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 33
·e52810
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IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
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CELLULOSE
·
2022
·Vol. 29
·期 11
·6123-6141
·
IF 6.123
Tang Lu,Huang Huihua
In this study, in order to minimize the degradation of curcumin, Pickering emulsion with embedded curcumin (PCNCs/EGCG-Cur) was prepared and stabilized by pineapple peel cellulose nanocrystals (PCNCs) and ( −)-Epigallocatechin-3-gallate (EGCG). The effect of EGCG on the stability and bioaccessibility of the embedded curcumin in Pickering emulsion was assessed. FTIR, XRD and zeta-potential analysis proved the construction of PCNCs/EGCG structure and CLSM showed typical oil-in-water system of PCNCs/EGCG-Cur. Furthermore, the addition of EGCG affected contact angles of the oil–water interface. 30-day storage period showed that the retained curcumin was about 70.35 ± 1.06% in PCNCs/EGCG(0.04%)-Cur, while the retention rate was 47.15 ± 0.98% in the control. PCNCs/EGCG(0.04%)-Cur was the most stable under the conditions of thermal and ultraviolet light treatments with the maximum retention rates of curcumin were 92.20 ± 1.05% and 93.56 ± 1.37%, respectively. Moreover, EGCG was found to improve the antioxidant activity of the prepared emulsions. Simulated digestion exhibited PCNCs/EGCG(0.04%)-Cur could improve the bioaccessibility of both EGCG (24.99 ± 3.29%) and curcumin (35.97 ± 1.26%). These results are conducive to the further application of EGCG in the emulsified food stabilized with cellulose nanocrystals.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Huli Yu,Liangjie Wang,Sheng Liu,Biao Zhao,Ke Xiao,Bo Yang,Huabo Duan,Huazhang Zhao,Jianping Deng
Poly/oligosaccharides are renewable natural resources with abundant chirality . Herein, we develop a general route to prepare optically active particles by using poly/oligosaccharides as both chiral inducers and growth templates. By complexing with Cu(NH 3 ) 4 2+ ions, OH groups on C2 and C3 in poly/oligosaccharides can transfer the chirality to Cu(II) and retain it in CuO . At the same time, poly/oligosaccharides direct growth of CuO by in situ transformation of Cu(NH 3 ) 4 2+ ions. Cellulose nanocrystal (CNC) and starch (ST) are used as representative polysaccharides , and β-cyclodextrin (β-CD) as a representative oligosaccharide, thus dandelion , duchesnea, and chrysanthemum-like composite particles with chiroptical activity are obtained. Besides, chiral CuO/poly(oligo)saccharide particles (CSP) demonstrate enantioselective ability by differentiating coordination with tryptophan (Trp) enantiomers and form Cu-Trp metal organic framework architectures with different morphologies. The study provides an easily accessible approach to prepare novel functional materials by poly/oligosaccharide-based chiral induction and hold great promise in chiral applications.
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CELLULOSE
·
2022
·Vol. 29
·期 13
·7263-7276
·
IF 6.123
Qiao Liangzhi,Liao Yuxin,Wang Xiawen,Wang Shanshan,Du Kaifeng
Cellulose microspheres are commonly chromatographic media yet seriously limited in biomacromolecules separation and purification due to the slow mass transfer kinetics resulting from their narrow nanopores. Herein, a macroporous cellulose microsphere (MCM) with enhanced mass transfer ability has been successfully developed by an oil-in-water-in-oil (O 1 /W/O 2 ) double emulsion strategy. The evolution profile of the double emulsion was tracked and achieved the optimization of interconnected macroporous structure. The macroporous structure not only provide fast mass transfer pathways for proteins but also increase the accessibility of meso/micropores. Benefitting from the macropores, the obtained diethylaminoethyl-modified MCM (DEAE-MCM) exhibits high permeability (3.81 × 10 –13 m 2 ), and fast adsorption rate (reaching equilibrium within 40 min) and high adsorption capacity (334.21 mg/g) for bovine serum albumin, far superior to commercially DEAE Sepharose Fast Flow. More importantly, under the high flow rate, DEAE-MCM remains a high dynamic adsorption capacity, promising it for fast protein chromatography.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Nitong Bu,Liying Huang,Guoyu Cao,Huanglong Lin,Jie Pang,Lin Wang,Ruojun Mu
Biopolymers , such as polysaccharides are increasingly concern in preparation of food packaging. However, those materials have weakness in properties of mechanics, hydrophobicity , and antibacterial, which limit their applications. In this work, we prepared emulsion (K-PL-CEOs) films with double network (DN) matrix by using konjac glucomannan (KGM) and Pullulan (PL), and incorporated with cellulose nanofibrils (CNF)-stabilized tea tree essential oil (TTEO) Pickering emulsions (CEOs). The effect of CEOs content on the structural and physicochemical properties of K-PL films was investigated. The results showed that CEOs were well dispersed in K-PL film forming matrix. The addition of CEOs could improve the thermal stability, UV-shielding, water resistance and mechanical properties of K-PL-CEOs films. Moreover, K-PL-CEOs films exhibited good antibacterial activity against E. coli and S. aureus . This paper demonstrated that K-PL-CEOs films can be potentially applied as food packaging.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yiqin Wang,Jie Lu,Siying Zhou,Jian Du,Yehan Tao,Yi Cheng,Haisong Wang
Much of the carbohydrate-rich reed sawdust (RS) produced from the reed pulping mills is burned or buried, causing a waste of resources. The aim of this work is to effectively bio-convert cellulose and hemicellulose of RS to L -lactic acid and xylo-oligosaccharide (XOS) after liquid hot water (LHW) pretreatment . The experiments were carried out via separation hydrolysis fermentation (SHF) and simultaneous saccharification fermentation (SSF) by optimizing the culture and fermentation conditions of a probiotics compound composed of a consortium of lactic acid bacteria . In the end, functional feed additives containing 69.33 wt% L -lactic acid and 26.82 wt% XOS can easily be obtained without additional handling by SSF configuration at 40 ℃ for 82 h with the initial fermentation pH 7.0. The conversion rate of glucose to L -lactic acid reached 72.33%. The bioconversion of available portion in RS into XOS and L -lactic acid paves a new way for high-value utilization of reed residue resources.
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BioEnergy Research
·
2022
·Vol. 16
·期 2
·1108-1120
·
IF 3.852
Xie Ruosong,He Weiwei,Qu Guangfei,Wu HuanHuan,Li Ziying,Li Junyan,Li Weijie
The application of biomass pyrolysis was still limited owing to the high pyrolysis temperature and the complicacy of pyrolysis products. In this work, a homogeneous low-temperature cellulose catalytic pyrolysis system is proposed to directional products 5-methylfurfural. The low-temperature catalytic activity and products distribution of cellulose pyrolysis in [bmim][FeCl 4 ] (Fe-IL) and [bmim] 2 CoCl 4 (Co-IL) at temperature gradients from 150 to 300 °C were studied. As the results, both Fe-IL and Co-IL can catalyze the pyrolysis of cellulose, especially for Fe-IL, which effectively reduced the pyrolysis temperature of cellulose to 200 °C. Nano-scale and micron-scale particles were produced by the catalysis of Fe-IL and Co-IL, respectively. Fe-IL have a high selectivity for the production 5-methylfurfural (5-MF) and furfural (FF), which were 71.12% and 19.14% respectively at the pyrolysis temperature of 200 °C. Furthermore, the mechanism of low-temperature catalytic pyrolysis and the directional evolution mechanism of 5-MF and FF were suggested. Graphical abstract
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Chun-yan Hu,Lan Bai,Fei Song,Yu-liang Wang,Yu-zhong Wang
Due to the serious threat of methanol to human health, the convenient, quick and specific detection of methanol is of great importance. Therefore, in this study, a biomass-derived chiral nematic composite film is fabricated by the co-evaporation of cellulose nanocrystals (CNC) and water-soluble polymer of β-cyclodextrin (PCD). The freestanding iridescent CNC-PCD film shows distinguishing structural colors of red and yellow green for methanol and ethanol respectively, realizing the identification of the two homologous alcohols by naked eyes. Besides, the quick, reversible and quantitative colorimetric sensing of the CNC-PCD film to methanol is verified. As its structural color and maximum reflection wavelength redshift to the greatest extent for methanol than other alcohols, the CNC-PCD film exhibits the specificity and selectivity for methanol detection in both single and mixed solvents. Such less-consumed and easy-to-handle CNC-PCD film may be useful as a colorimetric sensor to detect or discriminate methanol in some industrial products.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Cong-Cong Qin,Somia Yassin Hussain Abdalkarim,Ying Zhou,Hou-Yong Yu,Xia He
Agricultural lands are greatly affected by climate change, harsh soils, and desertification, which negatively impact the future sustainability of crop production. This work proposes a new strategy based on cellulose-inspired hydrogel (Gel-glycerol) as soil modulates to transform harsh soil into arable soil to promote seed germination and growth. Gel-glycerol with a 3D network structure exhibited good rheological properties, high thermal stability, thermal reversibility (−81.3 °C), and ultrahigh water-retention capacity (160%) for enhancing seeds germination. Compared with the control sample, the germination percentage and the average leaves number of wheat plants increased by 21.88% and 100% after 21, days with Gel-glycerol. Associated with the most common water-retaining agents (potassium polyacrylate , KPAM), the germination percentage of lettuce seeds for 16 days increased by 38% and 22% with Gel-glycerol treatment under harsh soils. Moreover, the water uptake value of wheat plants with Gel-glycerol improved by 94.7%. This result confirmed that adding Gel-Glycerol as an amendment can significantly tailor soil salt content. This finding offers excellent applicability in the agriculture ecosystem, displaying the potential value in soil amendments and an alternate solution for solving the continuing challenge of harsh environmental conditions.
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