CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao-Lin Wei,Jie Bu,Shi-Shui Zhou,Mao-Cheng Deng,Ming-Jun Zhu
This study aimed to develop a promising biorefinery technology for the value-added utilization of herb residues by using ionic liquid (IL) assisted by aromatic acid ( p -toluenesulfonic acid, TsOH) pretreatment. The result showed that the addition of low concentration of TsOH into IL could effectively deconstruct the recalcitrant intercellular structure of herb residues and rapidly extract the lignin fraction. Under the optimum conditions (79% IL, 1.0% TsOH, and 20% H 2 O at 130 °C and 2 h), the highest cellulose recovery yield of 96.4%, the lignin removal rate of 79.9% and ideal saccharification yield of 98.9% were achieved. Moreover, the main byproduct lignin exhibited comparable yield, high purity, and thermal stability, suggesting the potential application in the conversion of bio-based chemicals and materials. Furthermore, the IL was successfully recycled three times and the recovery rate was at least 95% each time. High saccharification yields and lignin recovery were maintained during all cycles. The hemicellulose-derived saccharides were the main impurities detected in the recycled IL. Overall, this work presents a novel green pretreatment process that can effectively utilize herb residues.
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2021
·Vol. 2
·期 12
·3927-3939
·
IF 0
Ya-Fang Zhang,Ben Dai,Dan Zhao,Di-Hui Zhang,Meng-Xing Xu,Xiang-Hua He,Chao Chen
To span the inherent application limitation of state-of-the-art catalysts for the chemical transformation of biomass derivatives, here, we formulate a series of Pr–Ni–P catalysts for the hydrogenation transformation of biomass-derived levulinic-acid, furfural and maleic anhydride. With comprehensive characterizations, Pr–Ni–P samples are verified as (PrPO4)m/Ni2P nanocomposites with a molar ratio (m) in the range of 0.24–11.0. In comparison with the poor catalytic performance of Ni2P, a ten-fold enhancement in TOF up to 0.45 s−1 and at least five-time promotion on the yield of objective products up to 91–98% are achieved by introducing proper amounts of PrPO4 to form reusable (PrPO4)m/Ni2P nanocomposites. Surface chemistry and kinetic mechanism studies further disclose that the cooperative catalytic function of two components, in particular the exclusive capability of PrPO4 to activate hydrogen, is responsible for the promoted hydrogenation transformation of biomass derivatives via a quick Langmuir–Hinshelwood process over (PrPO4)m/Ni2P. These findings imply that an easily obtainable, cost-affordable and robust rare earth phosphate like present PrPO4 could be a potential replacement catalytic component for the traditional metal catalyst in the hydrogenation transformation reactions of biomass derivatives, which was also worth noting as a new kind of basic material for other green mass-transformation techniques involving hydrogen activation processes such as corresponding optical and electrical transformations.
✓ 已验证
产品关联
DOI
RSC Advances
·
2021
·Vol. 11
·期 18
·10996-11003
·
IF 3.361
Mingxing Duan,Qingyan Cheng,Mingming Wang,Yanji Wang
A new noble metal-free Ni–Co–P/HAP (hydroxyapatite) amorphous alloy catalyst was synthesized by an impregnation-chemical reduction method; the structure and properties of the catalysts were characterized by XRD, SEM, BET, XPS and DSC. Based on the model of the hydrodeoxygenation (HDO) of vanillin to 2-methoxy-4-methylphenol (MMP) with formic acid as a hydrogen source, the catalytic performance of the catalyst was studied. The results found that the Ni–Co–P/HAP catalyst exhibited excellent catalytic activity for the in situ HDO reaction of vanillin compared with Ni–P and Ni–Co–P. The conversion of vanillin could be high to 97.86% with MMP selectivity of 93.97% under optimized reaction conditions. In addition, mechanism studies have shown that the side reaction of carbocation and vanillyl alcohol (HMP) condensation can be effectively reduced with increasing the hydrogenation rate, thereby the selectivity of MMP was effectively increased.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·562-573
·
IF 5.693
Cheng Xi Quan,Li Songwei,Bao Hongfei,Yang Xiaobin,Li Zhixing,Zhang Yingjie,Wang Kai,Ma Jun,Ullah Asmat,Shao Lu
The lack of highly permeable and selective separation membranes hampers the application of the energy-efficient membrane separation process for water remediation and CO 2 capture in molecular scale. Nanoparticles have been widely applied for tailoring pore structures and surface properties of the molecular separation membranes, thereby enhancing separation performance. However, limited by non-ideal nanoparticle aggregation, it remains a big challenge to fabricate such membranes on a large scale. Herein, we designed a kind of highly dispersed nanoparticles through grafting poly(sodium-p-styrenesulfonate) (PSS) on metal organic frameworks UiO-66 and deployed them for tailoring structure of polyelectrolyte membrane (PEM) for water remediation and Pebax (PEBA) symmetrical membranes for CO 2 capture, respectively. Because of electrostatic interaction, the PSS-grafted-UiO-66 (UiO-66-PSS) demonstrated nearly 100% dispersion in water and had an average particle size around 200 nm. Most interestingly, the introduction of the UiO-66-PSS finely tailored the affinity between membranes and target molecules, and the molecular structure of both PEM and PEBA membranes, thereby tripling the permeances of the membranes and slightly improving the selectivity of the membranes meanwhile. The PEM/UiO-66-PSS membranes demonstrated pure water permeance as high as 27.3 L m −2 h −1 bar −1 with MgSO 4 rejection above 98.7%. For CO 2 capture, the PEBA/UiO-66-PSS membranes exhibited 414.5 barrer with selectivity about 53.8. Taken together, the highly dispersed UiO-66-PSS shows strong promise in constructing molecular separation membranes with high separation performance for environmental remediation. Graphical abstract The highly dispersed PSS-grafted-UiO-66 finely tailored membrane structures of PEM membranes and the PEBA membranes and enhanced affinity between the target molecules and the aforementioned membranes, thereby tripling membrane permeances and improving the membrane selectivity slightly. The obtained PEM/UiO-66-PSS membranes and PEBA/UiO-66-PSS membranes show strong promise in water remediation and CO 2 capture, respectively.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Chenhong Xiao,Zhongyuan Zhou,Liujing Li,Zhenhai Yang,Shaolong Wu,Xiaofeng Li
Solar water splitting based on photoelectrochemical (PEC) cells has been intensively demonstrated to be promising for hydrogen energy , but it is usually difficult for one pure PEC system to achieve overall solar-driven water splitting. To solve this problem, integrating one PEC cell with one photovoltaic (PV) cell is widely employed, however, the preparation of an unabridged PV cell and the electrical connection between them are complicated. Herein, we directly synthesized hematite (α-Fe 2 O 3 ) film on the as-prepared p + n-Si micro-pyramid arrays with the modifications of SnO 2 interlayer and Co-Pi catalyst overlayer, and the turn-on potential achieved a substantial decrease, which is 0.34 V smaller than the Sn-doped hematite film grown on the FTO substrate (FTO/Sn@α-Fe 2 O 3 ). The influences of interlayer, overlayer and α-Fe 2 O 3 preparation conditions are systemically investigated. Besides, we comparatively studied the FTO/Sn@α-Fe 2 O 3 photoanode in tandem with the complete p + n-Si micro-pyramid PV cell, and observed the turn-on potential as low as 0.32 V vs. RHE. The performance improvement is ascribed to a combination of the additional photovoltage from the embedded p + n-Si junction, the enhancement both in optical absorption and surface area of α-Fe 2 O 3 film, and the promoted collection efficiency of photogenerated carriers from the interface and surface modifications. This work fills the gap of combining α-Fe 2 O 3 photoanode and p + n-Si junction with the aim of overall solar-driven water splitting, and provides a new route to simplify the PEC/PV tandem system.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 16
·50263
·
IF 2.52
Shengsong Dai,Xuejun Yu,Rui Chen,Hong Zhou,Zhiquan Pan
An epoxy resin (EP) with excellent fire retardancy, good transparency, and satisfactory thermal stability has been obtained by introducing a new N/P/S containing flame retardant (HBD) into EP composites. When the phosphorus content was 0.48 wt%, EP/HBD reached V-0 rating with the limiting oxygen index of 33.5%. The cone calorimeter test (CC) indicated that the incorporation of HBD resulted in 1.5 times increase in ignition time, a 50% decrease in the maximum of heat release rates, 40% reduction of total heat release, and 50.7% decrease in total smoke production compared with EP. Besides, the fire-resistant behavior of EP/8% HBD is much better than the EP materials modified by similar P/N/S flame retardants reported in literature. The fire-retardant mechanism of HBD on EP was also analyzed by Raman, scanning electron microscope, Py-GC/MS, and Fourier transform infrared spectroscopy. The results show that HBD plays an important role in the formation of a dense intumescent carbon layer and gas phase quenching.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xiong Peng,Li Chen,Shujun Liu,Lihua Hu,Jianwei Zhang,Aili Wang,Xiwen Yu,Zongcheng Yan
Organoarsenic compounds are considered as emerging pollutants since they may decompose into highly toxic arsenate in the environment. The adsorption of organoarsenic compounds by natural polymers has drawn research attention, but the adsorption mechanisms remain largely unexplored. In this study, the sorption interfacial interaction mechanisms of p -arsanilic acid on ionic liquid modified celluloses were investigated systematically by sorption models, spectroscopy analysis techniques, and density functional theory calculations. Adsorption experiments showed that the modified cellulose exhibited high adsorption capacity (216.9 mg/g) and fast adsorption rate (3.21 × 10 −3 g mg −1 ·min −1 ) toward p -ASA. Adsorption model studies revealed that the adsorption process was multilayer adsorption and dominated by the adsorption onto active site. The effect of environmental factors on p -arsanilic acid removal and spectroscopy analysis manifested that p -arsanilic acid interacted with the adsorbent through hydrogen bonding and π-π interaction to form outer-sphere complexes. Density functional theory calculation and independent gradient model analysis were used to analyze the interfacial interaction mechanisms, results of which showed that hydrogen bonding played the dominant role in the adsorption process and the imidazole group was preferential adsorption site. This work provides a valuable reference for understanding the role of weak force in the adsorption process between organoarsenic and adsorbents.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Lingjiao Li,Jing Xu,Sheng Zhao,Min Mao,Xuanhao Li
With the development of research on the photocatalytic water splitting and hydrogen (H 2 ) precipitation, cobalt ferrite and molybdate have begun to appear as catalysts for the study of photocatalytic hydrogen precipitation. In this paper, the p-n heterojunction CoFe 2 O 4 /NiMoO 4 (CFO/NMO) is prepared by hydrothermal method . The constructed p-n type (type Ⅱ) heterojunction CFO/NMO has the highest hydrogen evolution (Eosin Y as a sensitizer), which is 7.39 times and 1.95 times that of elemental CFO and NMO, respectively. After the CFO and NMO form a heterojunction, a built-in electric field is formed inside to effectively separate the photogenerated carriers . At the same time, the dense interface of the heterojunction also promotes the transfer of photogenerated carriers and promotes the reduction of H + protons on this catalyst surface . In short, this work provides more possibilities for the field of photocatalytic hydrogen evolution from molybdate and cobalt ferrite compounds.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1781-1793
·
IF 5.044
Chen Yu,Wan Caiyan,Liu Shidong,Wang Peng,Zhang Guangxian
Abstract A novel flame retardant with high P content and multi-reactive ammonium phosphorus acid groups Bis(2-hydroxyethyl) imino tris-(hydroxymethyl)-methane methylphosphonic acid (ABTMPA) was synthesized for treatment of cotton fabrics. The ABTMPA treated cotton fabrics were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and fourier transform infrared spectroscopy (FTIR). The structure of the ABTMPA was analyzed by the nuclear magnetic resonance. The limiting oxygen index (LOI) was used to evaluate the flame retardancy and durability of the treated cotton fabrics. The LOI value of cotton fabric treated with 31% ABTMPA was 50.2%, and an LOI of 41.2% was retained after 50 laundering cycles. Micro-burning calorimetry showed that total heat of combustion of the treated cotton fabric was reduced, and the char residual was much higher than that of pure cotton. Thermogravimetric (TG) and TG-FTIR analyses indicated that the flame retardant ABTMPA changed the thermal decomposition pathway of cellulose, and the combustible gases generated at high temperature was much lower than that of pure cotton. Flame retardant treated cotton fabric had excellent flame retardancy and durability. In addition, whiteness and breaking strength are well maintained. Therefore the ABTMPA shows the potential of flame retardants in future commercial applications. Graphic abstract
✓ 已验证
DOI
高影响因子
CHIRALITY
·
2021
·Vol. 33
·期 4
·176-183
·
IF 2.437
Ling Gong,Shan Li,Zhengzhi Yin,Kelin Li,Jiawei Gu,Datong Wu,Yong Kong
Poly( p -aminobenzene sulfonic acid) (pABSA) was electrodeposited onto the surface of a glassy carbon electrode (GCE), which was then used for the preconcentration of l -tryptophan ( l -Trp) due to the electrostatic and π–π interactions between pABSA and l -Trp. Polypyrrole (PPy) was electrodeposited onto the surface of the l -Trp enriched pABSA, and then the l -Trp templates were removed, resulting in molecularly imprinted PPy/pABSA. To avoid the interference from the oxidation peak of PPy on the following electrochemical chiral recognition of Trp isomers, PPy was overoxidized by cyclic voltammetry (CV). The resultant molecularly imprinted overoxidized PPy (OPPy)/pABSA modified GCE exhibits higher affinity toward l -Trp than d -tryptophan ( d -Trp); that is, the oxidation peak current of l -Trp is greatly higher than that of d -Trp at the molecularly imprinted OPPy/pABSA modified GCE.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 4
·1604-1614
·
IF 2.578
Gang Zhang,Dongdong Song,Su Ma,Yanlin Wang,Xiaotian Xie,Yanmao Dong
Currently, the issue of improving the flame-retardant performance of unsaturated polyester resin (UPR) has drawn a lot of attention. In this study, methyl vinyl di (1-thio-2,6,7-trioxal-1-phosphabicyclo [2.2] octane-4-methoxy) silane (MVDOS) with P-N-Si-based cage unit was synthesized, and it was utilized as a reactive flame-retardant monomer to modify UPR. The UPR/MVDOS composites were prepared by introducing different ratios of MVDOS into UPR via the reaction of crosslink. The efficiency of the resulted composites was investigated by using the limiting oxygen index (LOI), vertical burning test, and cone calorimeter test. The results showed that the composites reached the V-0 rate without dripping, and the LOI value was 29.1% when the content of MVDOS was as low as 18 wt%. Cone calorimeter tests revealed the peak of heat release and CO production of UPR/MVDOS-18 were 238.2 KW/m 2 and 0.0167 g/s, which were respectively lower than the ones of neat UPR. The introduction of MVDOS also increased the stability of UPR composites. Furthermore, the scattering electron microscopy, laser Raman spectroscopy, and X-ray photoelectron spectroscopy studies revealed that the incorporation of MVDOS stimulated the UPR matrix to generate char layer with increased graphitization degree, which provided a good barrier to prevent heat and oxygen from being transferred and then protected the materials inside from further burning. This research provides a new way to obtain flame-retardant UPR composites with high performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 38
·49157
·
IF 2.52
Zhangyu Ma,Linlong Li,Xincui Shi,Zongliang Wang,Min Guo,Yu Wang,Zixue Jiao,Congxiao Zhang,Peibiao Zhang
Polyetheretherketone (PEEK) is a promising bone and dental tissue engineering material with excellent mechanical properties and biocompatibility, but its biological inertness deficiency limits its clinical applications. In this study, poly(sodium p-styrene sulfonate) (pNaSS) was grafted onto PEEK surface by ultraviolet (UV) induced polymerization to enhance its osteogenic activities. Attenuated total reflectance Fourier transformed Infrared (ATR-FTIR) spectroscopy, scanning electron microscopy (SEM), and contact angle (CA) analysis were carried out to prove the success of grafting polymerization. Toluidine blue O (TBO) colorimetric assay was utilized to quantify the graft amounts of pNaSS. Results showed that the amounts of grafted pNaSS on the PEEK surface could be well-controlled from 0.59 ± 0.07 mmol/cm 2 to 5.08 ± 0.20 mmol/cm 2 , through adjusting the UV irradiation time and monomer concentration. The hydrophilicity of PEEK surface was increased and the in vitro mineralization ability was promoted with the introduction of pNaSS. Besides, this surface modification method did not influence the intrinsic mechanical properties of PEEK. in vitro biological studies revealed that cell adhesion, proliferation, and osteogenic differentiation of MC3T3-E1 cells were enhanced with the increase of graft amounts.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）