Bioresources and Bioprocessing
·
2021
·Vol. 8
·期 1
·1-14
·
IF 4.578
Gong Zhenggang,Yang Guangxu,Song Junlong,Zheng Peitao,Liu Jing,Zhu Wenyuan,Huang Liulian,Chen Lihui,Luo Xiaolin,Shuai Li
Abstract Lignin deposits formed on the surface of pretreated lignocellulosic substrates during acidic pretreatments can non-productively adsorb costly enzymes and thereby influence the enzymatic hydrolysis efficiency of cellulose. In this article, peanut protein (PP), a biocompatible non-catalytic protein, was separated from defatted peanut flour (DPF) as a lignin blocking additive to overcome this adverse effect. With the addition of 2.5 g/L PP in enzymatic hydrolysis medium, the glucose yield of the bamboo substrate pretreated by phenylsulfonic acid (PSA) significantly increased from 38 to 94% at a low cellulase loading of 5 FPU/g glucan while achieving a similar glucose yield required a cellulase loading of 17.5 FPU/g glucan without PP addition. Similar promotion effects were also observed on the n-pentanol-pretreated bamboo and PSA-pretreated eucalyptus substrates. The promoting effect of PP on enzymatic hydrolysis was ascribed to blocking lignin deposits via hydrophobic and/or hydrogen-bonding interactions, which significantly reduced the non-productive adsorption of cellulase onto PSA lignin. Meanwhile, PP extraction also facilitated the utilization of residual DPF as the adhesive for producing plywood as compared to that without protein pre-extraction. This scheme provides a sustainable and viable way to improve the value of woody and agriculture biomass. Peanut protein, a biocompatible non-catalytic protein, can block lignin, improve enzymatic hydrolysis efficiency and thereby facilitate the economics of biorefinery. Graphical abstract
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 3
·1095-1109
·
IF 3.134
Deng Renjie,Zeng Manlin,Tian Yao
A novel heterogeneous catalytic system was developed for the preparation of para -nitrobromobenzene ( p -NBr) with nitrogen dioxide (NO 2 ) as nitrating agent in the presence of oxygen (O 2 ). By applying Hβ zeolite as the catalyst, p -NBr can be obtained with high conversion (85.7%) and selectivity (91.7%). In addition, it can be recycled at least five times without a significant decrease in catalytic activity, which demonstrates its high efficiency, good stability and regenerability. Meanwhile, DFT study explained the regioselectivity for the nitronium (NO 2 + ) nitration via electrophilic process, which support the experimental conclusion. Graphical abstract
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高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 12
·1782-1792
·
IF 4.803
Lin Yuemin,Zhang Yuanyuan,Nie Renfeng,Zhou Kai,Ma Yao,Liu Mingjie,Lu Dan,Bao Zongbi,Yang Qiwei,Yang Yiwen,Ren Qilong,Zhang Zhiguo
Ultra-dispersed Ni nanoparticles (7.5 nm) on nitrogen-doped carbon nanoneedles (Ni@NCNs) were prepared by simple pyrolysis of Ni-based metal—organic-framework for selective hydrogenation of halogenated nitrobenzenes to corresponding anilines. Two different crystallization methods (stirring and static) were compared and the optimal pyrolysis temperature was explored. Ni@NCNs were systematically characterized by wide analytical techniques. In the hydrogenation of p -chloronitrobenzene, Ni@NCNs-600 (pyrolyzed at 600 °C) exhibited extraordinarily high performance with 77.9 h −1 catalytic productivity and > 99% p -chloroaniline selectivity at full p -chloronitrobenzene conversion under mild conditions (90 °C, 1.5 MPa H 2 ), showing obvious superiority compared with reported Ni-based catalysts. Notably, the reaction smoothly proceeded at room temperature with full conversion and > 99% selectivity. Moreover, Ni@NCNs-600 afforded good tolerance to various nitroarenes substituted by sensitive groups (halogen, nitrile, keto, carboxylic, etc.), and could be easily recycled by magnetic separation and reused for 5 times without deactivation. The adsorption tests showed that the preferential adsorption of −NO 2 on the catalyst can restrain the dehalogenation of p -chloronitrobenzene, thus achieving high p -chloroaniline selectivity. While the high activity can be attributed to high Ni dispersion, special morphology, and rich pore structure of the catalyst.
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高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2020
·Vol. 132
·期 1
·1-14
·
IF 1.406
Cheng Si Yuan,Yang Xi Nan,Tao Zhu,Wei Lian Tong,Zhao Wei Wei,Jiang Dao Fa,Jin Yan Mei,Gao Jie,Ma Pei Hua
Abstract The host–guest binding characteristics of cyclopentanocucurbit[6]uril (CyP 6 Q[6]) and cyanine dye trans -4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide ( t -DSMI) have been studied. The results show that CyP 6 Q[6] and t -DSMI form a 1:1 inclusion system, generating strong fluorescence. On this basis, the fluorescent probe t -DSMI@CyP 6 Q[6] has been constructed, and its anion recognition ability has been investigated. In a neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe, since they have stronger binding forces. This probe shows greater sensitivity than the previously reported probe t -DSMI@HMeQ[6]. Graphic abstract Since the complex formed by CyP 6 Q[6] and t -DSMI can produce strong fluorescence at pH > 4.6, t -DSMI@CyP 6 Q[6] was constructed to recognize the anions at pH ≅ 5. The results show that in a near neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe.
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高影响因子
JOM
·
2023
·Vol. 75
·期 2
·268-278
·
IF 2.6
Li Yan-Chun,Zhao Fei-Ping,Liu Hui,Peng Bing,Min Xiao-Bo,Lin Zhang
It is critical to recycle valuable elements such as zinc and iron from smelting waste containing zinc ferrite because of the resource crisis and environmental sustainability. Sulfating roasting followed by water leaching has been considered a promising approach. In this study, a novel sulfating roasting method using SO 2 has been developed to treat zinc ferrite for the efficient separation of zinc and iron. Moreover, the conversion mechanism of zinc ferrite and SO 2 was investigated in detail. The results showed that the transformation rate of zinc ferrite reached 95.47% at 600°C for 30 min under SO 2 /SO 2 + O 2 of 60% (v/v). The mechanism studies revealed that O in SO 2 combined with the O vacancy of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) , while the S in SO 2 combined with the \( {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) for electron migration. S (IV) was oxidized to S (VI) while Fe 3+ was reduced to Fe 2+ . Importantly, zinc ferrite transformed into zinc-deficient magnetite intermediate ( \( {\text{Zn}}^{{2 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{A}} - {\text{site}}}} - {\text{O}} - {\text{Fe}}^{{3 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{B}} - {\text{site}}}} \) ) via reduction of Fe 3+ and migration of Fe 2+ . The transformation of zinc ferrite was a catalyst-free redox reaction. This study provided a new insight into the utilization of smelting waste and a theoretical basis for the efficient separation of zinc and iron from smelting waste containing zinc ferrite.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·
IF 1.6
Liu Zengcheng,Wang Yanfei,Xu Yufen,Peng Tianqiong
Tetraphenyldithiodiphosphonate is synthesized by polymerization precipitation. The P = S bond of the material has strong polarity, which is conducive to improving the electron mobility of the complex and inhibiting the accumulation between molecules. The synthesized tetraphenyldithiodiphosphonate is characterized by FT-IR, SEM, XPS and XRD. In addition, the pseudo-second-order kinetic model is used to simulate the experimental data well, and the adsorption process conforms to the Langmuir isotherm model. Thermodynamic studies of adsorption have shown that the adsorption process is essentially a spontaneous endothermic process. At room temperature, tetraphenyldithiodiphosphonate demonstrates a maximum adsorption capacity for uranium(VI) reaching 398.8 mg g −1 .
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高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 10
·1493-1504
·
IF 4.803
Xu Yuxuan,Dai Guanglong,Nie Shibin,Yang Jinian,Liu Song,Zhang Hong,Dong Xiang
Metal—organic framework-derived materials have attracted significant attention in the applications of functional materials. In this work, the rod-like nickel-based metal—organic frameworks were first synthesized and subsequently employed as the hard templates and nickel sources to prepare the whisker-shaped nickel phyllosilicate using a facile hydrothermal technology. Then, the nickel phyllosilicate whiskers were evaluated to enhance the mechanical, thermal, flammable, and tribological properties of epoxy resin. The results show that adequate nickel phyllosilicate whiskers can disperse well in the matrix, improving the tensile strength and elastic modulus by 13.6% and 56.4%, respectively. Although the addition of nickel phyllosilicate whiskers could not obtain any UL-94 ratings, it enhanced the difficulty in burning the resulted epoxy resin nanocomposites and considerably enhanced thermal stabilities. Additionally, it was demonstrated that such nickel phyllosilicate whiskers preferred to improve the wear resistance instead of the antifriction feature. Moreover, the wear rate of epoxy resin nanocomposites was reduced significantly by 80% for pure epoxy resin by adding 1 phr whiskers. The as-prepared nickel phyllosilicate whiskers proved to be promising reinforcements in preparing of high-performance epoxy resin nanocomposites.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 24
·期 3
·272-281
·
IF 0
Xu Fengyun,Na Ping
Novel three-dimensional string and ball-like titanium dioxide/reduced graphene oxide, TiO 2 /rGO (STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermal treatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO 2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removal rate of 86.0% for methylene blue and its reaction rate constant (5.27 × 10 −3 min −1 ) was much higher than those of pure string and ball-like TiO 2 (ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which \(^{ \bullet } {\text{O}}_{2}^{ - }\) and • OH were the main oxidizing groups. This work offers new insights into a better design and preparation of novel composite materials for the removal of organic dyes.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 42
·期 3
·2211-2220
·
IF 1.221
Liu Shuilin,You Kuiyi,Jian Jian,Luo Qing,Liu Pingle,Ai Qiuhong,Luo He’an
A simple and effective approach for highly selective preparation of nitrocyclohexane from cyclohexane using tert-butyl nitrite as a nitrating agent under atmospheric pressure has been successfully developed in this work. The results indicate that the N -hydroxyphthalimide catalyst gave the best results with 27.3 % of cyclohexane conversion and 88.0 % of selectivity to nitrocyclohexane under optimal reaction conditions. The present reaction provides a novel strategy for the synthesis of nitroalkanes from the nitration of low-carbon alkanes because of the mild reaction condition, simple experimental procedure and high selectivity towards the desired product. This method may be very significant to establish such a synthesis method for aliphatic nitro-compounds from the low-carbon alkanes in organic fields.
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高影响因子
MOLECULAR DIVERSITY
·
2018
·Vol. 23
·期 2
·299-306
·
IF 2.229
Lv Xian-Hai,Liu Hao,Ren Zi-Li,Wang Wei,Tang Feng,Cao Hai-Qun
Abstract A series of novel Mannich base derivatives of flavone containing benzylamine moiety was synthesized using the Mannich reaction. The results of antifungal activity are not ideal, but its antifungal effect has a certain increase compared to flavonoids. After that, four bacteria were used to test antibacterial experiments of these compounds; compound 5g (MIC = 0.5, 0.125 mg/L) showed significant inhibitory activity against Staphylococcus aureus and Salmonella gallinarum compared with novobiocin (MIC = 2, 0.25 mg/L). Compound 5s exhibited broad spectrum antibacterial activity (MIC = 1, 0.5, 2, 0.05 mg/L) against four bacteria. The selected compounds 5g and 5s exhibit potent inhibition against Topo II and Topo IV with IC 50 values (0.25–16 mg/L). Molecular docking model showed that the compounds 5g and 5s can bind well to the target by interacting with amino acid residues. It will provide some valuable information for the commercial antibacterial agents. Graphical Abstract
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PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 7
·2107-2114
·
IF 2.936
Zhao Wenli,Niu Xiaopo,Liu Guangni,Zhang Xiurong,Wang Qingfa
Three kinds of Pt nanocrystals with different morphologies (5 nm cubes, 10 nm cubes and 5 nm truncated octahedrons) were synthesized and employed to fabricate Pt/CNT-USY catalysts for selective ring opening of decalin. The 5 nm truncated octahedral Pt/CNT-USY with exposed (100) and (111) facets exhibited higher yield of ring-opening products (53.9 wt%) than the CNT-USY-supported 5 nm cubic Pt catalyst enclosed by the (100) facets (39.6 wt%). Moreover, the 5 nm cubic Pt showed better catalytic activities compared to the 10 nm cubic Pt/CNT-UST catalyst, which ascribed to the smaller size of Pt NCs enriched more revealable metal active sites. DFT calculations demonstrated that the adsorption of decalin on Pt (111) was stronger than that on Pt (100) facets, which was profitable for the selective ring-opening reaction. Graphical Abstract
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 3
·1-12
·
IF 2.132
Ma Wenzhong,Li Taiyu,Zhang Qi,Zhong Jing,Matsuyama Hideto
Hydrophilic UiO-66 crystals with superior water adsorption ability were synthesized and incorporated into the polyimide (PI) membrane for efficient aprotic solvent separation via pervaporation. The effect of the different UiO-66 addition in the pyromellitic dianhydride (PMDA)-2, 2-bis[4-(4-amlnophenoxy)phenyl]propane (BAPP)-based PI membrane on the membrane structure, thermal stability, surface hydrophilicity, solvent-resistant, and pervaporation performance was systematically studied. The UiO-66/PI hybrid membranes with small amount content (2 wt%) exhibited high hydrophilicity and excellent swelling resistance due to the superb dispersion benefiting from the excellent complexation of UiO-66 and PI chain. The effects of operational variables such as operating temperature and concentration of feed solution on the pervaporation separation performance of the hybrid membranes with different UiO-66 loadings were investigated. When the mass fraction of UiO-66 was 2 wt%, the hybrid membranes show the permeation flux of 109.7 and 57.1 g/(m 2 h) and separation factor of 34.1 and 133.9, respectively, for DMF/H 2 O and DMAc/H 2 O systems.
Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）