|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Simultaneous Extraction of Carboxylated Celulose Nanocrystals and Nanofibrils via Citric Acid Hydrolysis--A Sustainable Route显示文摘In this study, cellulose nanocrystals(CNC) with surface carboxylic groups were prepared from bleached softwood pulp by hydrolysis with concentrated citric acid at concentrations of 60 wt%~80 wt%. The solid residues from acid hydrolysis were collected for producing cellulose nanofibrils(CNF) via post high-pressure homogenization. Citric acid could be easily recovered after hydrolysis reactions through crystallization due to its low water solubility or through precipitation as a calcium salt followed by acidification. Several important properties of CNC and CNF, such as dimension, crystallinity, surface chemistry, thermal stability, were evaluated. Results showed that the obtained CNC and CNF surfaces contained carboxylic acid groups that facilitated functionalization and dispersion in aqueous processing. The recyclability of citric acid and the carboxylated CNC/CNF give the renewable cellulose nanomaterial huge potential for a wide range of industrial applications. Furthermore, the resultant CNC and CNF were used as reinforcing agents to make sodium carboxymethyl cellulose(CMC) films. Both CNC and CNF showed reinforcing effects in CMC composite films. The tensile strength of CMC films increased by 54.3% and 85.7% with 10 wt% inclusion of CNC and CNF, respectively. This study provides detailed information on carboxylated nanocellulose prepared by critic acid hydrolysis; a sustainable approach for the preparation of CNC/CNF is of significant importance for their various uses. | Chao Liu HaiShun Du Guang Yu YueDong Zhang QingShan Kong Bin Li XinDong Mu | 2017 | Paper And Biomaterials2017，2，4： | 4 |
| 2 | Thermodynamics of glycerol hydrogenolysis to propanediols over supported copper clusters: Insights from first-principles study显示文摘Copper catalysts supported on metal oxides display unique efficiency and selectivity in catalyzing glycerol hydrogenolysis to propanediols. Understanding the reaction at the molecular level is the key to rational design of better catalysts for propanediol synthesis, which is one of the major challenges for glycerol application in energy. In this work, extensive calculations based on periodic density functional theory were carried out to study thermodynamics of glycerol hydrogenolysis over binary model catalysts, including Cu/ZrO2 and Cu/MgO, with the focus to elucidate the competitive reaction pathways to produce the 1,2-propanediol (1,2-PDO) and 1,3-propanediol (1,3-PDO). Our results suggest that the reaction starts with glycerol dehydration on the metal oxide, followed by sequential hydrogenation over metal centers. Based on our explorations on the stabilities of adsorbed reactants, dehydrated intermediates and hydrogenated species along the reaction channels, the DFT calculations show that the 1,2-PDO formation will dominate in comparison to the 1,3-PDO from thermodynamic viewpoint. This is consistent with our experiments where the Cu catalysts seem to give the 1,2-PDO as a main product. The calculations and experiments also indicate that the Cu/MgO exhibits superior activities than Cu/ZrO2 for the hydrogenolysis of glycerol molecules. | GUAN Jing WANG XiCheng WANG XiaoYan MU XinDong | 2013 | Science China Chemistry2013，56，6： | 1 |
| 3 | Aromatization and isomerization of methylcyclohexane over Ni catalysts supported on different supports显示文摘In this work, nickel metal supported on different supports(SiO_2, Al_2O_3, ZSM-5) were prepared by spraying nickel nitrate on the supports and calcined at 873 K. Then, they were characterized by XRD, XRF, N_2 adsorption–desorption, NH_3-TPD, MCH-TPD, H_2-TPR, and pyridine-FTIR,and tested as catalysts for the dehydrogenation aromatization and isomerization of methylcyclohexane(MCH) under the conditions of S-Zorb catalytic adsorption desulfurization(T ? 673 K, P ? 1.5 MPa, WHSV ? 5 h^(-1)). The H2-TPR results showed that the interaction of NiO with support decreased in the order of NiO/ZSM-5-Fe < NiO/ZSM-5 < NiO/Al_2O_3< NiO/SiO2. The decrease of the interaction appeared to facilitate the reduction of Ni and therefore to promote the dehydrogenation aromatization of MCH.It was found that a direct correlation existed between the gasoline components yields, cracking activity and the total number of different supports acid sites measured by NH_3-TPD tests. Higher total acidity of ZSM-5 resulted in gasoline loss because of higher cracking activity of MCH. The number of total acid sites of NiO/ZSM-5-Fe decreased and the medium strong Br€onsted acid sites necessary for MCH isomerization increased after the modification of ZSM-5 by iron metal. So, NiO/ZSM-5-Fe exhibited enhanced MCH conversion, aromatic and isomerization yields when compared to NiO/ZSM-5 and other Ni-based catalysts. This study shows that NiO/ZSM-5-Fe catalyst may be possible to be integrated into the S-Zorb system achieving the recovery of the octane number of gasoline. | Ye Song Wei Lin Xingcui Guo Linlin Dong Xindong Mu Huiping Tian Lei Wang | 2019 | Green Energy & Environment2019，4，1： | 1 |
| 4 | Sustainable preparation and characterization of thermally stable and functional cellulose nanocrystals and nanofibrils via formic acid hydrolysis显示文摘In this work,a sustainable method to prepare functional cellulose nanocrystals(CNCs)and cellulose nanofibrils(CNFs)using formic acid(FA)(a recoverable organic acid)was established.After FA hydrolysis,the obtained CNCs could be well dispersed in DMAC.Thus,the CNC products and fibrous cellulosic solid residue(FCSR)in DMAC could be easily separated by a conventional centrifugal process,and the collected FCSR could be further fibrillated to CNFs with relatively low-intensity mechanical fibrillation process.The isolated CNC products showed high crystallinity index(about 75%)and excellent thermal stability(with onset thermal degradation temperature of 325℃).Both the resultant CNCs and CNFs showed better dispersibility in DMSO,DMF and DMAC respectively because of the introduction of ester groups on the surface of the products.The presence of surface ester groups could increase the interface compatibility of nanocelluloses with polymeric matrices and enable their applications in reinforcing polymeric matrix materials(e.g.the composite films like PHVB+CNFs). | Haishun Du Chao Liu Dong Wang Yuedong Zhang Guang Yu Chuanling Si Bin Li Xindong Mu Hui Peng | 2017 | Journal of Bioresources and Bioproducts2017，2，1： | 1 |
| 5 | Hydrogenolysis of biomass-derived sorbitol to glycols and glycerol over Ni-MgO catalysts显示文摘 | Xinguo Chen Xicheng Wang Shengxi Yao Xindong Mu | 2013 | Catalysis Communications2013，，： | 1 |
| 6 | Combined Deacetylation and PFI Refining Pretreatment of Corn Cob for the Im- provement of a Two-Stage Enzymatic Hydrolysis显示文摘 | Zhang Yuedong Mu Xindong Wang Haisong | 2014 | Journal of Agri- cultural and Food Chemistry2014，62，： | 1 |
| 7 | Dose escalation guided by^(18)F-FDG PET/CT for esophageal cancer显示文摘Objective:To assess the feasibility of dose escalation guided by ^(18)F-deoxyglucose positron emission tomography/computer tomography(^(18)F-FDG PET/CT)for esophageal cancer(EC).Methods and materials:Ten random patients treated with definitive chemoradiotherapy and pre-therapeutic ^(18)FFDG PET/CT were included in this study.Retrospectively,a threshold of 50%of SUVmax was used to define the high FDG uptake region of the GTV(GTVPET).Three intensity-modulated radiation therapy(IMRT)plans were generated,delivering three dose levels to three different planning target volumes(PTVs).50.4 Gy delivered to PTV50.4 was defined on computed tomography(CT)as Plan50.4,63 Gy was delivered to PTV63 was defined as GTV plus a uniform margin of 0.5 cm as Plan63,and 70 Gy delivered to PTV70 was defined as GTVPET plus a 0.5 cm margin as Plan70.A dosimetric comparison was performed based on normal tissue complication probability(NTCP)for the lung and heart.Results:Clinically acceptable dose escalation failed for 2 of 10 patients in Plan63 due to heart dose constraints.One patient failed heart dose constraint for Plan70.Two patients failed spinal cord constraint for Plan63.Three patients failed lung dose constraints for both Plan63 and Plan70,two of which were even not suitable for Plan50.4 for the same reason.NTCP modeling for lung showed increased risk for Plan63 and Plan70 compared to Plan50.4.The difference between Plan63 and Plan70 was insignificant.NTCP modeling for heart showed an increased risk from 6.38%of Plan50.4 to 8.88%of Plan70(P=0.009)or 9.79%of Plan63(P=0.007).The risk of heart mortality was significantly higher for Plan63 than Plan70(P=0.047).Conclusions:Selective boosting of sub-volumes based on ^(18)F-FDG PET/CT is feasible way with a modest increase in the risk of cardiac and lung toxicities. | Bingjie Fan Chengqiang Li Fengchun Mu Wenru Qin Linlin Wang Xindong Sun Chunni Wang Bing Zou Shijiang Wang Wanlong Li Man Hu | 2021 | Radiation Medicine and Protection2021，2，2： | 0 |
| 8 | Recent progress on the pretreatment and fractionation of lignocelluloses for biorefinery at QIBEBT显示文摘Pretreatment and fractionation are amongst the key steps for the conversion of lignocelluloses to sustainable biofuels,biomaterials or biochemicals,as pretreatment/fractionation can break the natural recalcitrance of lignocelluloses,improving the conversion efficiency of downstream processes.This paper reviews the recent progress on the pretreatment and fractionation of lignocelluloses for biorefinery at the Chinese Academy of Sciences-Qingdao Institute of Bioenergy and Bioprocess Technology(QIBEBT).The main technologies developed at the QIBEBT in recent years include alkaline twin-screw extrusion pretreatment,modified alkali pretreatment,hydrogen peroxide-assisted sodium carbonate pretreatment,fractionation with formic acid,as well as the two-step fractionation by hot water treatment coupling ammonium sulfite treatment.With the development of these technologies,a pilot scale platform for the pretreatment and saccharification of biomass has been established in the pilot plant of QIBEBT. | Bin Li Chao Liu Guang Yu Yuedong Zhang Haisong Wang Xindong Mu Hui Peng | 2017 | Journal of Bioresources and Bioproducts2017，2，1： | 0 |
| 9 | Ameliorated enzymatic saccharification of corn stover with a novel modified alkali pretreatment显示文摘Enzymatic saccharification/hydrolysis is one of the key steps for the bioconversion of lignocelluloses into sustainable biofuels.In this work,corn stover was pretreated with a novel modified alkali process(NaOH+anthraquinone(AQ)+sodium lignosulfonate(SLS)),and then enzymatically hydrolyzed with an enzyme cocktail(cellulase(Celluclast 1.5L),β-glucosidase(Novozyme 188)and xylanase(from thermomyceslanuginosus))in the pH range of 4.0-6.5.It was found that the suitable pH for the enzymatic saccharification process to achieve a high glucan yield was between 4.2 and 5.7,while the appropriate pH to obtain a high xylan yield was in the range of 4.0-4.7.The best pH for the enzymatic saccharification process was found to be 4.4 in terms of the final total sugar yield,as xylanase worked most efficiently in the pH range of 4.0-4.7,under the conditions in the study.The addition of xylanase in the enzymatic saccharification process could hydrolyze xylan in the substrates and reduce the nonspecific binding of cellulase,thus improving the total sugar yields. | Guang Yu Huanfei Xu Chao Liu Paul DeRoussel Chunyan Zhang Yuedong Zhang Bin Li Haisong Wang Xindong Mu | 2016 | Journal of Bioresources and Bioproducts2016，1，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员