INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Xiaoxue Zhao,Xin Xu,Zhe Ling,Caoxing Huang,Chenhuan Lai,Qiang Yong
Developing green pretreatment technologies that prioritize the selective separation of lignin is of significant importance for the industrialization of biorefining. This work employed H 2 SO 4 -catalyzed γ-valerolactone (GVL) pretreatment on masson pine sawdust (GAM) to investigate process conditions and the enzymatic hydrolysis performance of masson pine. The results indicated that the lignin removal rate was 87.2% under the optimal pretreatment conditions (150ºC, 75 mM H 2 SO 4 ). The synergistic effect of the H 2 SO 4 catalyst and GVL pretreatment resulted in an enzymatic hydrolysis yield for GAM (76.8%) nearly six times higher than that of other non-synergistic systems (5.7%∼13.0%). Furthermore, the enzymatic hydrolysis yield increased to 97.3% upon the addition of bovine serum albumin . Microscopic visualization was used to analyze the morphological changes of cells and the micro-distribution of lignin within GAM cell walls after pretreatment. Additionally, structural changes in the molecular weight , functional groups, and linkage contents of GAM lignin were analyzed. This research provides valuable insights for masson pine in producing fermentable monosaccharides and acquiring lignin with enhanced processing properties.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·29-38
·
IF 4.036
Zhen Zhang,Xiaoling Cui,Wei Yuan,Qihao Yang,Huarong Liu,Hangxun Xu,Hai-Long Jiang
A facile and efficient γ-radiation strategy has been developed to incorporate surface-clean metal nanoparticles (NPs) into UiO-66-NH2 in the absence of stabilizing agents and additional reductants. This approach is enabled by metal ion reduction with active e−aq and H˙ species derived from water radiolysis. As a result, highly dispersed Pd NPs with narrow size distribution were generated and evenly dispersed in UiO-66-NH2. More importantly, the radiation-reduced Pd NPs exhibit significantly enhanced catalytic activity and stability in olefin hydrogenation. Meanwhile, they are also highly active in the catalytic reduction of 4-nitrophenol to 4-aminophenol. Furthermore, the proposed radiation methodology could be successfully extended to prepare other metal NPs such as Au and Pt. Considering that γ-ray radiation is widely used in industry, this study provides a potentially scalable approach to incorporate metallic nanomaterials into metal–organic frameworks with improved catalytic performance.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Weizhi Liu,Yongqiang Guo,Zhiwei Xue,Hao Sun,Xiaofeng Lin,Chao Liu
Polyvinylidene fluoride (PVDF) membrane is a cheap and commonly used separation material, but its inherent hydrophobicity results in significant membrane contamination, which limits its engineering application and further development. The hydrophilic PVDF-g/co-NVP membrane was prepared through low-dose γ-ray irradiation and using N-vinyl-2-pyrrolidinone (NVP) as a modifier in this study. The effects of γ-ray dose and incorporating NVP additive on the microstructure, hydrophilicity, anti-fouling capability, and mechanical capacity of membranes were discussed. Molecular dynamics (MD) simulation method was used to comprehensively investigate the impact of the NVP on the physicochemical characteristics of membrane structure. Under a specific NVP load, the water contact angle of the membrane decreases from 87.92° to 52.66°. The pure water permeance reaches 362.1 L/m 2 h, and the porosity increases to 55.21 %±1.29 %, which indicates that γ-ray irradiation with NVP addition can effectively adjust the pore structure and hydrophilicity of the membrane. During anti-fouling test against bovine serum albumin (BSA), the modified membrane exhibits remarkable anti-fouling characteristics, including reduced BSA accumulation, enhanced flux recovery, lower irreversible contamination level, and extended cleaning cycle compared with the original pure PVDF membrane because of its higher hydrophilicity and positive zeta-potential value. This study elucidates the mechanism underlying γ-ray graft modification of PVDF membranes, thereby providing valuable insights into the development of efficient functional membrane materials.
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LANGMUIR
·
2024
·
IF 3.7
Yunju Wang,Xintong Zhang,Yichun Liu,Shunchao Ma,Li Qi,Hongyu Wang
Intercalation of anions unlocks graphite as a positive material in energy storage devices, and the performance could be affected by solvents in solutions. In this context, it is vital to investigate the role of solvents in anion intercalation. Herein, a hierarchical intercalation phenomenon, in which different graphite intercalation compounds are generated in the same solution, is studied in lithium tetrafluoroborate (LiBF4) solutions of carboxylate ester solvents γ-butyrolactone (GBL) and methyl acetate (MA). The evolution modes of the graphite cathode structure during electrochemical intercalation and deintercalation are discussed via in situ X-ray diffraction (XRD) measurements. Based on this, the relationship between GICs and potentials, together with concentrations, is compared in detail. Furthermore, various graphite materials with different surface properties are applied to adjust the anions’ solvation status inside graphite sheets.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2024
·
IF 6.2
Huijuan Ma,Tingqian Wang,Junfeng Wang,Peiyao Wang,Qi Shu,Ruilin Qin,Sijia Li,Huan Xu
The correlation between formaldehyde (FA) exposure and prevalence of asthma has been widely reported. However, the underlying mechanism is still not fully understood. FA exposure at 2.0 mg/m 3 was found to exacerbate asthma in OVA-induced murine models. IFN-γ, the cytokine produced by T helper 1 (Th1) cells, was significantly induced by FA in serum and bronchoalveolar lavage fluid (BALF) of asthmatic mice, which was different from cytokines secreted by other Th cells. The observation was also confirmed by mRNA levels of Th marker genes in CD4+ T cells isolated from BALF. In addition, increased production of IFN-γ and expression of T-bet in Jurkat T cells primed with phorbol ester and phytohaemagglutinin were also observed with 100 μM FA treatment in vitro . Upregulated STAT1 phosphorylation, T-bet expression and IFN-γ production induced by FA was found to be restrained by STAT1 inhibitor fludarabine, indicating that FA promoted Th1 commitment through the autocrine IFN-γ/STAT1/T-bet pathway in asthma. This work not only revealed that FA could bias Th lineage commitment to exacerbate allergic asthma, but also identified the signaling mechanism of FA-induced Th1 differentiation, which may be utilized as the target for development of interfering strategies against FA-induced immune disorders.
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Radiation Effects and Defects in Solids
·
2024
·
IF 1.1
Xue-Liang Ni,Jia-Le Li,Jia-Hao Lv,Zhi-Jie Liao,Chen Yang,Jun Zeng,Ying-Jun Li,Yin-Tao Li,Yuan-Lin Zhou,Quan-Ping Zhang
Achieving lead-free flexible materials with excellent γ-ray shielding as well as good mechanical properties are of significance to radiation protection safety and wear comfort of wearable articles. In this paper, polydopamine (PDA) is coated on Bi2O3 particles to form a typical core–shell structure Bi2O3@PDA, which is used to intensely bond bismuth oxide (Bi2O3) with chloroprene rubber (CR). It promotes the interface interaction between Bi2O3 and CR matrix, leading to the uniform dispersion of the filler and rich interfacial compatibility in CR/Bi2O3@PDA composite with as high as 50 wt% filling. Furthermore, 50 wt% CR/Bi2O3@PDA composite displays 53.6% shielding rate for 105 keV γ-rays. Meanwhile, its tensile strength and elongation at break are 9.6 MPa and 1424.8%, respectively, which are without sacrificing too much in comparison with the neat rubber. We propose a versatile route to prepare superior integrated properties of flexible materials, which can be used as wearable articles for radiation shielding.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Shu-Xiang Xiang,Jin-Peng Wang,Su Gao,Zhan-Kuo Guo,Hui-Lin Jiang,Bao-Xia Dong,Yun-Lei Teng
The CH 4 yield over dual functional materials (DFMs) remains low and requires further improvement. In this work, we first examined the influence of Mn on the performance of the Ni-CaO/γ-Al 2 O 3 DFM for CO 2 capture and in situ methanation. Our results showed that the MnNi-DFM-3 (MnNi-CaO/γ-Al 2 O 3 DFM) exhibited the best performance at 350 °C, with a CH 4 yield of 0.56 mmol/g which is 4 times higher than that of the Ni-DFM-1 (Ni-CaO/γ-Al 2 O 3 DFM) (0.14 mmol/g). Nanoscale characterization revealed that highly scattered Mn 3 O 4 acted as a barrier preventing the agglomeration of Ni-based catalysts. Furthermore, our density functional theory (DFT) analysis demonstrated that the introduction of Mn enhanced the activation of CO 2 , promoted the dissociation of H 2 and intermediates, and reduced the activation energy needed to produce carboxylic acid intermediates on the Ni catalyst. The prepared MnNi-DFM is promising to be a cheap efficient material for CO 2 capture and in situ methanation. This work opens up a new pathway for enhancing the performance of DFMs using inexpensive transition metals.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jiarong Qiu,Yi Liu,Jingwen Zhang,Ben Zhou,Qiyue Yang,Liangqing Zhang,Jianfeng Chen,Bingshu Wang,Lu Lin,Xianhai Zeng
A series of zirconium phosphate (ZrP) loaded H-beta-25 zeolite (i.e., ZrP@HB) multifunctional composite catalysts were synthesized by a simple co-precipitation method, and the one-pot upgrading for the transfer hydrogenation of furfural to γ-valerolactone (GVL) was systematically investigated through various characterizations and catalytic evaluation experiments. Comparative characterization analysis of the ZrP@HB-X(Y) catalysts showed that the ZrP@HB-4(4) catalyst has uniform distribution of elements, exhibiting a large specific surface area and hierarchical mesoporous/microporous structure. Fourier transform infrared spectroscopy of pyridine (Py-FTIR) and NH 3 temperature-programmed desorption characterizations indicated the presence of Lewis and Brønsted acid sites, as well as weak, moderate, and strong acid sites in the ZrP@HB-4(4) catalyst. It was confirmed by X-ray photoelectron spectroscopy and FTIR that the main reason for Lewis and Brønsted acid sites formation is the presence of P-O-Zr, P-O-H, and HB zeolite on the ZrP@HB-4(4) catalyst. The HB zeolite as well as Zr and P ratio, can be easily adjusted to efficiently regulate the acidity strength and Lewis and Brønsted acid sites of the ZrP@HB-X(Y) catalysts. The catalytic experiments demonstrated that the physicochemical properties of the ZrP@HB-4(4) catalyst mentioned above significantly enhance the GVL production. Notably, Lewis and Brønsted acid sites as well as transition metal sites of Zr in the ZrP@HB-4(4) catalyst were identified as the main factors that enhance the yield of the target product. By optimizing the reaction conditions, the yield of GVL could be as high as 88.16%. Reusability experiments demonstrate that the ZrP@HB-4(4) catalyst possesses excellent stability. Using levulinic acid as the substrate, the yield of GVL reached 93.92%, suggesting its potential versatility.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2024
·
IF 3.4
Yuguang Wang,Mengjing Wu,Huifang Zheng,Dongmei Wu,Panpan Yao,Wenjing Li,Kexin Jin,Xinjun Yu
A strain high-performance of esterase producing bacteria was screened from soil, which could selectively hydrolyze D -homoserine lactone from its racemate to achieve the resolution of L - homoserine lactone with more than 99% e.e. in 48% yield. L -homoserine lactone building block was then converted to L -α-amino-γ-bromobutyronic acid chiral blocks, which reacted with various nucleophilic reagent modules could to be applied to prepare L -γ- substituted α-amino acids such as L -selenomethionine, L -methionine, L -glufosinate and L -selenocystine. Its advantages included high selectivity of biocatalytic resolution reactions, high optical purity of products, racemic recycle of D -substrates and modular reaction, which simplified the production process of these products and highlighted the power of biological manufacturing.
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Polymers
·
2024
·Vol. 17
·期 1
·10
·
IF 4.7
Youhong Ai,Yangyang Zhan,Dongbo Cai,Shouwen Chen
The presented work discusses the highly efficient esterification of poly (γ-glutamic acid) (γ-PGA) with alkyl halides at room temperature. The esterification reaction was completed within 3 h, and the prepared γ-PGA esters were obtained with excellent yields (98.6%) when 1,1,3,3-tetramethylguanidine (TMG) was used as a promoter. The influence of the amount of TMG, solvent, reaction conditions, and alkyl halides on the esterification reaction was examined. It was found that polar aprotic solvents, such asN-Methylpyrrolidone (NMP) and 1,3-Dimethyl-2-imidazolidinone (DMI), were favorable for the esterification. Non-polar or weakly polar solvents (i.e., dichloroethane, acetonitrile) were not favorable for the esterification. Water as a solvent had a negative effect on esterification. The reactivity of bromine halogenated compounds was higher than that of chlorine halogenated compounds but lower than that of iodine halogenated compounds. The structures of the prepared γ-PGA ester were confirmed by1H NMR and FT-IR spectroscopy. Thermal stability and hydrophobic properties of the resulting product were tested. The results showed that the prepared γ-PGA propyl ester had high thermal stability (up to 267 °C) and showed good hydrophobicity (contact angle 118.7°).
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ACS Nano
·
2024
·
IF 15.8
Hanchen Shen,Lidong Du,Changhuo Xu,Bingzhe Wang,Qingqing Zhou,Ruquan Ye,Ryan T. K. Kwok,Jacky W. Y. Lam,Guichuan Xing,Jianwei Sun,Tzu-Ming Liu,Ben Zhong Tang
Activity-based detection of γ-Glutamyltranspeptidase (GGT) using near-infrared (NIR) fluorescent probes is a promising strategy for early cancer diagnosis. Although NIR pyridinium probes show high performance in biochemical analysis, the aggregation of both the probes and parental fluorochromes in biological environments is prone to result in a low signal-to-noise ratio (SBR), thus affecting their clinical applications. Here, we develop a GGT-activatable aggregate probe called OTBP-G for two-photon fluorescence imaging in various biological environments under 1040 nm excitation. By rationally tunning the hydrophilicity and donor–acceptor strength, we enable a synergistic effect between twisted intramolecular charge transfer and intersystem crossing processes and realize a perfect dark state for OTBP-G before activation. After the enzymatic reaction, the parental fluorochrome exhibits bright aggregation-induced emission peaking at 670 nm. The fluorochrome-to-probe transformation can induce 1000-fold fluorescence ON/OFF ratio, realizing in vitro GGT detection with an SBR > 900. Activation of OTBP-G occurs within 1 min in vivo, showing an SBR > 400 in mouse ear blood vessels. OTBP-G can further enable the early detection of pulmonary metastasis in breast cancer by topically spraying, outperforming the clinical standard hematoxylin and eosin staining. We anticipate that the in-depth study of OTBP-G can prompt the development of early cancer diagnosis and tumor-related physiological research. Moreover, this work highlights the crucial role of hydrophilicity and donor–acceptor strength in maximizing the ON/OFF ratio of the TICT probes and showcases the potential of OTBP as a versatile platform for activity-based sensing.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Cheng Wang,Shuijing Zhou,Xiaoming Wang,Wenfeng Tan,Xionghan Feng
Photo-catalyzing sulfite (S(IV)) for the generation of sulfate radical (SO 4 •- ) has emerged as a novel advanced oxidation process (AOP) recently. However, both the potential of soil minerals as effective photocatalysts and the process of water acidification due to S(IV) oxidation have been overlooked. Herein, maghemite (γ-Fe 2 O 3 ), a typical soil iron oxide with excellent photocatalytic reactivity like hematite and magnetic-collectible property like magnetite, was successfully used to activate S(IV) for iohexol degradation under visible light irradiation. As a result, 91.3% of iohexol was eliminated within 15 min at 0.1 g/L maghemite and 0.5 mM S(IV) under neutral conditions. The influencing factors, including initial pH, catalyst dosage, S(IV) amount, co-existing substances and water matrix, were systematically investigated. The maghemite/S(IV)/vis system exhibited superior performance in iohexol degradation at a wide pH range (3–10). It was found that the released proton via S(IV) oxidation led to severe water acidification. Interestingly, a low dose of HCO 3 − could evidently resist water acidification with little influence on iohexol elimination. Radical quenching experiments and electron spin resonance (ESR) analysis confirmed that SO 4 •- , •OH and •O 2 − were involved in iohexol abatement with SO 4 •- being the dominant reactive species. Compared with hydrogen peroxide, persulfate and peroxymonosulfate, the established maghemite/S(IV)/vis system achieved much more remarkable degradation performance. Furthermore, the reactivity of the catalyst was not obviously reduced even after 10 runs of reaction. This study expands the application of soil iron oxide mineral in S(IV) activation in water treatment and proposes an approach to regulate water acidification in S(IV)-based AOP.
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