CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Hui-Shan Meng,Shu-Zhen He,Mei-Mei Wang,Jia-Rui Xi,Jia-Tai Wen,Hong-Wei Luo,Wei-Kang Wang,Juan Xu
The activation of persulfate by heterogeneous catalysts is susceptible to background matrices present in wastewater, resulting in reduced catalytic efficiency during practical applications. Herein, a persulfate activation cell (PAC) is developed by spatially separating pollutants and persulfate into two independent chambers. The CuCoNi-NF catalyst is fabricated and utilized as the electrode of the PAC. The performance of the PAC is compared with a mixed persulfate activation system (PAM) concerning cyclic degradation of various phenolic pollutants and in the presence of different environmental matrices. The results indicate that phenol pollutants such as bisphenol A (BPA) can be degraded in the PAC via transferring electrons to persulfate. The PAC exhibits superior stability compared to the PAM during six cyclic BPA degradation experiments, with BPA degradation rate constant decreasing by 16.7% for PAC and 81.9% for PAM. Over the 192-hour continuous operation period, the PAC attains a BPA removal efficiency of 88.8 ± 5.6%, a TOC removal efficiency of 74.0 ± 4.6%., and a current output of 0.24 ± 0.04 mA. Furthermore, environmental matrices such as cations, anions, humic acid, and natural water environments demonstrate a slight enhancing effect on BPA degradation in the PAC while conversely displaying inhibition in the PAM. High solution conductivity benefits BPA degradation in the PAC by reducing internal resistance. The pH level of the environment (pH 6–9) has minimal impact on the degradation of BPA in the PAC. The pollutants begin to degrade in PAC when the anode potential reaches their oxidation potential, and the stable potential difference between the anode and cathode ensures the continuous oxidation of the pollutants. Our work proposes a novel persulfate activation strategy that can effectively degrade target pollutants by resisting environmental interferences.
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Genes
·
2023
·Vol. 14
·期 6
·1287
·
IF 3.5
Meng Chu,Yichao Qin,Xiuying Lin,Li Ma,Dehai Deng,Daizhu Lv,Pengcheng Fu,Huan Lin
The coconut (Cocos nuciferaL.) is a commercial crop widely distributed among coastal tropical regions. It provides millions of farmers with food, fuel, cosmetics, folk medicine, and building materials. Among these, oil and palm sugar are representative extracts. However, this unique living species ofCocoshas only been preliminarily studied at molecular levels. Benefiting from the genomic sequence data published in 2017 and 2021, we investigated the transfer RNA (tRNA) modifications and modifying enzymes of the coconut in this survey. An extraction method for the tRNA pool from coconut flesh was built. In total, 33 species of modified nucleosides and 66 homologous genes of modifying enzymes were confirmed using a nucleoside analysis using high-performance liquid chromatography combined with high-resolution mass spectrometry (HPLC-HRMS) and homologous protein sequence alignment. The positions of tRNA modifications, including pseudouridines, were preliminarily mapped using a oligonucleotide analysis, and the features of their modifying enzymes were summarized. Interestingly, we found that the gene encoding the modifying enzyme of 2′-O-ribosyladenosine at the 64th position of tRNA (Ar(p)64) was uniquely overexpressed under high-salinity stress. In contrast, most other tRNA-modifying enzymes were downregulated with mining transcriptomic sequencing data. According to previous physiological studies of Ar(p)64, the coconut appears to enhance the quality control of the translation process when subjected to high-salinity stress. We hope this survey can help advance research on tRNA modification and scientific studies of the coconut, as well as thinking of the safety and nutritional value of naturally modified nucleosides.Keywords:Cocos nucifera;epitranscriptomics;LC-MS/MS;nucleoside misidentification;RNA modification
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Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 19
·4535-4546
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IF 7
Qiaoqiao Ding,Mang Niu,Hong Su,Zhanyin Liu,Jianfei Gao,Yanhui Zhao,Chunlei Liu,Yuan Liu,Chunzhao Liu
Developing highly efficient catalysts to effectively activate peroxymonosulfate (PMS) is a key challenge for degrading polychlorinated phenols posing a long-term risk of toxicity to environmental water. Here, a novel surface hierarchically nanostructured Co3O4/hydrogen titanate (HTO) composite catalyst (Co3O4/HTO) was prepared using electrospinning technology followed by a low-temperature alkaline hydrothermal process. Such a structural design endows the Co-based composite catalysts with rich and efficient surface-active cobalt sites, and provides rich hydroxyl groups for the composite catalyst, both of which enhance the catalytic performance of the composite catalyst in PMS based reactions. As expected, the optimum Co3O4/HTO catalyst can efficiently catalyze PMS to produce large amounts of free radicals, enabling the degradation of 2,4-dichlorophenol (2,4-DCP) completely within a very short time period (nearly 10 min). Density functional theory calculation further demonstrated that the Co3O4/HTO catalyst helps to enrich the charge density of PMS for the easy breakdown of the O–OH bond to generate more free radicals than the single Co3O4 catalyst. By analyzing the free radicals and intermediate products generated in catalytic reactions, possible degradation mechanisms and pathways of 2,4-DCP were proposed. This work offers a new approach to design low-cost and highly active PMS activators for the purification of wastewater.
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 17
·6869-6880
·
IF 9.8
Zhikun Peng,Zhixi Wu,Xiaotong Sun,Hongji Li
Aryl ethers greatly influence lignin depolymerization and the oxygen content in lignin products. Cleaving aryl ethers normally requires harsh conditions such as high-pressure hydrogen gas and elevated temperature. Herein, we developed a synergistic method that combines photocatalytic hydrogen transfer with acid catalysis for H2-free hydrogenolysis of diphenyl ether and aromatic oxygenates at room temperature. The electron-enriched Pt/TiO2 surface stored abundant hydrogen species under light irradiation and efficiently catalyzed hydrogen transfer from isopropanol to aryl ethers. The acid mediated the hydrogenation sequence into: hydrogenolysis of aryl C–O bonds > saturation of aryl rings ≫ hydrogenolysis of aliphatic C–O bonds. DFT calculations suggested the aryl ether bond adsorbed on the Pt surface was weakened through protonation. This method delivered 98% yield of aliphatic monomers (73% cyclohexane and 25% cyclohexanol) from cleavage of diphenyl ether, and converted aromatic mixtures into cycloalkanes (57%) and aliphatic alcohols (9%) under mild conditions.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Peng Wei,Liu Jiaxin,Liu Xiaoqing,Wang Liqun,Yin Lichang,Tan Haotian,Hou Feng,Liang Ji
Electrocatalytic hydrogen peroxide (H 2 O 2 ) production via the two-electron oxygen reduction reaction is a promising alternative to the energy-intensive and high-pollution anthraquinone oxidation process. However, developing advanced electrocatalysts with high H 2 O 2 yield, selectivity, and durability is still challenging, because of the limited quantity and easy passivation of active sites on typical metal-containing catalysts, especially for the state-of-the-art single-atom ones. To address this, we report a graphene/mesoporous carbon composite for high-rate and high-efficiency 2e − oxygen reduction catalysis. The coordination of pyrrolic-N sites -modulates the adsorption configuration of the *OOH species to provide a kinetically favorable pathway for H 2 O 2 production. Consequently, the H 2 O 2 yield approaches 30 mol g −1 h −1 with a Faradaic efficiency of 80% and excellent durability, yielding a high H 2 O 2 concentration of 7.2 g L −1 . This strategy of manipulating the adsorption configuration of reactants with multiple non-metal active sites provides a strategy to design efficient and durable metal-free electrocatalyst for 2e − oxygen reduction.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Li Zheng,Yajing Zhu
A novel magnesium oxide and poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) composite modified carbon paste electrode (MgO-PP/CPE) has been fabricated for the sensitive quantification of bisphenol A (BPA). The modified electrode was characterized by scanning electron microscopy (SEM), chronocoulometry and electrochemical impedance spectroscopy (EIS). Compared with MgO/CPE, PP/CPE, and CPE, MgO-PP/CPE exhibited enhanced electrochemical activity toward the oxidation of BPA, which was due to the high surface area of MgO and facile electron transfer ability of PEDOT:PSS. Under the optimum conditions, the linear sweep voltammetric oxidation peak current of BPA was linear with its concentration in the ranges from 1.0 nM to 0.4 µM and 0.4 to 10 µM, with a low detection limit of 0.5 nM (3S/N). The fabricated sensor was successively applied to the quantification of BPA content in water samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Boxu Wang,Zheng Liu,Zhihong Li,Ningyi Xu,Xuejiao Zhang,Ruifang Su,Junyang Wang,Rui Jin,Chunyan Sun
Hg 2+ is highly toxic to human health and ecosystem. In this work, based on the unique fluorescent property of 2-Aminopurine (2-AP), the formation of T-Hg 2+ -T mismatch structure and the signal amplification of exonuclease III (Exo III) assisted target cycle, a fluorescent probe for facile and sensitive detection of Hg 2+ is constructed. The hairpin-looped DNA probe is rationally designed with 2-AP embedded in the stem and thymine-rich recognition overhangs extended at the termini. The cleavage of the double stranded DNA stem with stable T-Hg 2+ -T pairs catalyzed by Exo III is prompted to happen upon recognition of trace Hg 2+ . Under the optimal reaction conditions, there is an excellent linear relationship between Hg 2+ concentration and fluorescence intensity in the range of 7.5–200 nM with a detection limit of 0.38 nM. In addition, the detection results of Hg 2+ in Songhua River water and fish samples are satisfactory. The fluorescent probe avoids labeling additional quenchers or quenching materials and has strong anti-interference ability. Thus, the fluorescent probe has a broad prospect in practical application.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Ruiyu Zhu,Zhen Chen,Helin Lv,Yani Pan,Xinyu Feng,Guicai Chen,Weilian Hu,Tianhua Xu,Fangyuan Fan,Shuying Gong,Ping Chen,Qiang Chu
Aged white tea (WT) has promising medicinal potential, but how to accurately identify aged white tea is still a difficult problem. Inspired by tea cream, the relationship between the characteristics of nanoparticles in tea infusion and aging time was studied. The results showed that with the increase of aging time, the particle size of white tea nanoparticles (WTNs) decreased gradually. Microscopic images showed that the surface structure of WTNs was changed in three aspects: the waxy layer, the cuticle layer and the palisade tissue. Additional in vitro modeling demonstrated a strong correlation between nanoparticle size and protein and tea polyphenol content. The correlation between nanoparticle sizes and aging time was further verified in aged Pu’er raw tea. Starting with the tea infusion's nanoparticles, this study showed that the aging time of WT would impact the nanoparticles' properties, offering a unique way to determine the aging period of WT.
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CATALYSIS LETTERS
·
2023
·Vol. 153
·期 10
·3044-3052
·
IF 2.8
Li Kaihui,Xu Junyuan,Zhang Huan,Zhu Lihua
Abstract Cyclohexanone is a crucial intermediate for producing nylon and other industrial products. However, the direct hydrogenation of phenol for synthesizing cyclohexanone easily generates cyclohexanol and thus reduce the yield. In this work, the Pd/WO 3 catalysts with different Pd contents (Pd/WO 3 -1–0.21 wt%, Pd/WO 3 -2–0.69 wt%, Pd/WO 3 -3–2.20 wt%) are prepared via using sodium borohydride liquid phase reduction, which have good catalytic performance for phenol selective hydrogenation. The Pd/WO 3 -2 catalyst can achieve 92.9% conversion, 84.4% selectivity and high TOF (turnover frequency) of 349.1 h −1 under the reaction conditions (120 °C, 2 h, 3.0 MPa H 2 ). The nanostructures of the catalysts are extensively characterized by XRD, XPS, SEM, TEM, HRTEM, STEM and STEM-EDS elemental mapping and line-scanning. It is found that the Pd/WO 3 -2 catalyst has a high Pd dispersion and quite tiny Pd clusters. Alternatively, the stability experiment of Pd/WO 3 -2 indicates that the conversion decreases from 92.9% to 87.5% and the selectivity to cyclohexanone does not change significantly (84%) after it is recycled for five times. Graphic Abstract
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Water
·
2023
·Vol. 15
·期 15
·2856
·
IF 3.4
Jing Wang,Huanyu Zhou,Li Ma,Quanfeng Wang,Da Sun,Libo Jin,Guoming Zeng,Jujiao Zhao
Peroxymonosulfate (PMS) activation has gained increasing attention for its water remediation. In this work, carbon nanotube-supported FeCo2O4nanoparticles (FeCo2O4/CNT) were prepared and showed tremendous potential as a catalyst for PMS activation. The synergistic effect between FeCo2O4and CNT in FeCo2O4/CNT promotes its better catalytic performance than individual CNT or FeCo2O4. The synthesized FeCo2O4/CNT could reach 100% phenol removal with akvalue of 0.30 min−1within 15 min ([PMS] = 0.3 g L−1, [FeCo2O4/CNT] = 0.3 g L−1). FeCo2O4/CNT can adapt well to a wide pH range (4–9) and a complex water component (with inorganic ions or organic matter). Moreover, the catalytic mechanism investigation suggested that both radical and non-radical pathways are accountable for the efficient removal of phenol.Keywords:peroxymonosulfate;FeCo2O4/CNT;phenol removal
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Nano Research
·
2023
·
IF 9.9
Zhao Yunfei,Liu Xiaohao,Zhou Zhi,Feng Chaobo,Luo Nan,Yan Jiajun,Tan Shuo,Lu Yang,Chen Feng,Lu Bing-Qiang,He Shisheng
Mineralization has found widespread use in the fabrication of composite biomaterials for hard tissue regeneration. The current mineralization processes are mainly carried out in neutral aqueous solutions of biomineral counter-ions (a pair of cation and anion that form the corresponding minerals at certain conditions), which are stable only at very low concentrations. This typically results in inefficient mineralization and weak control over biomineral formation. Here, we find that, in the organic solvent glycerol, a variety of biomineral counter-ions (e.g., Ca/PO 4 , Ca/CO 3 , Ca/SO 4 , Mg/PO 4 , or Fe/OH) corresponding to distinct biominerals at significantly high concentrations (up to hundreds-fold greater than those of simulated body fluid (SBF)) are able to form translucent and stable solutions (mineralizing solution of highly concentrated counter-ions (MSCIs)), and mineralization can be triggered upon them with external solvents (e.g., water or ethanol). Furthermore, with pristine bacterial cellulose (BC) membrane as a model, we demonstrate an effective and controllable mineralization performance of MSCIs on organic substrates. This approach not only forms the homogeneous biominerals on the BC fibers and in the interspaces, but also provides regulations over mineralization rate, mineral content, phase, and dopants. The resulting mineralized BC membranes (MBCs) exhibit high cytocompatibility and favor the proliferation of rat bone marrow mesenchymal stem cells (rBMSC). Following this, we prepare a mineralized bone suture (MBS) from MBC for non-weight bearing bone fixation, which then is tested on a rabbit median sternotomy model. It shows firm fixation of the rabbit sternum without causing discernible toxicity or inflammatory response. This study, by extending the mineralization to the organic solution system of highly concentrated counter-ions, develops a promising strategy to design and build targeted mineral-based composites.
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POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Yanlu Sun,Zhengqi Wang,Dequn Wu,Xueli Wang,Jianyong Yu,Ruchao Yuan,Faxue Li
The absence of inherently flame-retardant polyamide 6 (FR-PA6) with enhanced anti-dripping and melt spinnability has significantly limited its further application in textiles. In this work, a binary reactive flame retardant composed of commercial 9,10-dihydro-10-[2,3- di ( hydroxycarbonyl ) propyl ]-10-phosphaphenanthrene-10-oxide (DDP) and synthesized polydiphenylsiloxane (PDPS) was employed to fabricate FR-PA6 through a facile synthetic route. The prepared FR-PA6 containing 5 wt% DDP and 5 wt% PDPS (FR-PA6-5-5) exhibited a UL94 V-0 rating with no melt-droplets during combustion, a 31.0% reduction in heat release rate and a 18.8% decrease in total heat release compared to pure PA6 in cone calorimetric tests. The improved fire safety of FR-PA6-5-5 was contributed to the gas-phase quenching and dilution effect and the condensed-phase barrier effect, which was enhanced by the synergistic charring effect achieved through the formation of P(= O )-O-Si. Additionally, FR-PA6-5-5 exhibited excellent melt spinnability as demonstrated by the successful preparation of filaments with a tensile strength of approximately 2.27 cN/dtex.
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危险品化学品经营许可证（带存储）