SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Lifeng Ping,Haifeng Zhuang,Shengdao Shan
In this study, an internal circulation-anoxic/aerobic (IC-A/O) process followed by ultrafiltration (UF) and reverse osmosis (RO) system was applied for paper wastewater reclamation. The IC-AO system presented a stable and efficient performance, achieving high removal of chemical oxygen demand (COD), total organic carbon (TOC) and total nitrogen (TN) with methane production rate of 132.8 mL/d. Acute toxicity to Daphnia magna ( D. magna ) was reduced significantly (83.2%) and the spearman's rank correlation analysis indicated that the toxicity of effluents from each reactor were positively correlated with COD and TOC. Hexadecanoic acid, octadecanoic acid and benzophenone were the main toxic contributors for biological effluent. Microbial community revealed that Anaerolinea was significantly related with organic pollutants. The UF-RO system further removed pollutants and toxicity with the final effluent COD, TOC, ammonium nitrogen (NH 4 + -N) and TN of 32.6, 18.8, 0.3 and 9.2 mg/L, respectively, which proved that it was feasible for paper wastewater reuse. This study presented an efficient, practical and environmentally competitive system, and paved a foundation for the treatment and reuse of paper wastewater.
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ANALYTICAL CHEMISTRY
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2013
·
IF 5.695
Shao-Ting Wang,Wei Huang,Wei Lu,Bi-Feng Yuan,Yu-Qi Feng
A novel TiO2-based SPE strategy was developed for eliminating normal ribonucleosides before mass spectrometry (MS) analysis of 2′-deoxynucleosides and 2′-O-modified ribonucleosides. The chromatographic research for the retention behavior of ribonucleosides and 2′-deoxynucleosides on TiO2 materials was investigated using TiO2 separation column. The results indicated a specific affinity interaction mechanism between TiO2 and cis-diol-containing ribonucleosides, and the interaction was proved effective even under a wide range of pH conditions and salt concentrations. Benefiting from these features, a TiO2-based solid phase extraction (SPE) method was developed for highly efficient elimination of RNA contamination from genomic DNA. Compared with the widely used enzymatic digestion method, the proposed TiO2-based SPE method showed much more efficiency for the removal of RNA as well as provided high recoveries for the 2′-deoxynucleosides. In addition, the sample processing time is dramatically shortened using the TiO2-based SPE method (∼5 min) compared to the traditional enzymatic digestion method (∼12 h). Finally, the purification of 2′-O-methylated ribonucleosides from RNA was successfully achieved in HeLa cells by the TiO2-based SPE method, which provided a proof-of-concept for the purification of relevant modified ribonucleosides from bulky normal ribonucleosides. Taken together, this strategy developed in the current study offers a promising option to purify 2′-deoxynucleosides/2′-O-modified ribonucleosides for their sensitive and accurate determination by eliminating normal ribonucleosides in biological samples.
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JOURNAL OF CHROMATOGRAPHY A
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2016
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IF 3.926
Wenwu Yan,Nani Wang,Peimin Zhang,Jiajie Zhang,Shuchao Wu,Yan Zhu
A standard-free and sensitive method was developed for analysis of sucrose acetates in a crude 6- O -acetyl sucrose (S-6-a) product by on-line hydrolysis-high-performance liquid chromatography with pulsed amperometric detection (PAD). Sucrose, three regio-isomers of acetyl sucrose and five regio-isomers of diacetyl sucrose were separated on a C18 column using 3% (v/v) acetonitrile in water as eluent within 25 min. After purification with LC followed by semi-preparative HPLC, their chemical structures were identified by 1D, 2D NMR and LC–MS. Moreover, quantification of those regio-isomers was achieved by on-line alkaline hydrolysis to liberate sucrose using a post-column delivery system, and then detected by PAD for indirect estimation of the sucrose acetate content. Under optimal conditions, the linear ranges were from 0.03 to 150 μmol L −1 for sucrose corresponding to sucrose acetates with coefficient of determination as 0.9997 and detection limit as 0.01 μmol L −1 ( S/N = 3). Good repeatability was obtained (RSD < 3%, n = 6). Furthermore, this method has been successfully applied to the analysis of sucrose and sucrose acetates in a crude S-6-a product during synthesis, purification and structure elucidation studies. The recoveries were from 94.89% to 102.31% for sucrose and sucrose acetates.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jin Zhang,Chaoying Wang,Yanhui Niu,Shijie Li,Rongqin Luo
A novel electrochemical sensor based on molecularly imprinted polymer membranes (MIPM) as biomimetic molecular recognition element involved in o -aminothiophenol functionalized Au nanoparticles (ATP@AuNPs) modified gold electrode was constructed for sensitive and selective detection of herbicide simazine (SMZ). The nano-scaled MIPM, with high specific surface area, was prepared by self-assembly of o -aminothiophenol (ATP) and electrodeposition of ATP@AuNPs in the presence of template SMZ. Cathodic current of SMZ was measured by cyclic voltammetry and the results exhibited that the proposed sensor possess a high electrocatalytic activity at a negative potential and a fast rebinding dynamics towards the reduction of SMZ in 0.01 M H 2 SO 4 solution (pH 1.7). Linear dependency of peak current on SMZ concentrations was observed from 0.03 to 140 μM and detection limit was estimated to be 0.013 μM (3S/N). The enhancement of sensitivity was attributed to the presence of gold nanoparticles (AuNPs) which decreased the electron-transfer impedance and increased imprinting sites, lead to the superior enrichment effect of the trace amount of SMZ in aqueous solvent. The developed SMZ imprinted sensor exhibited excellent long-term stability and acceptable repeatability. In addition, the proposed method was successfully applied to measure SMZ in several real samples with the spiked recoveries changing from 91.4% to 96.8%, showing a promising potential in practical application.
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Analytical Methods
·
2016
·Vol. 8
·期 23
·4727-4735
·
IF 1.915
Chaojun He,Xiangmeng Guo,Yumin Yang,Yanfu Xie,Fengyang Ju,Wenbo Guo
Aroma volatiles from zijuan and pu-erh green teas were extracted by headspace solid-phase microextraction (HS-SPME). They were then characterized and identified using gas chromatography-olfactometry (GC-O) and gas chromatography-mass spectrometry (GC-MS). The conditions of HS-SPME, including fiber selection and optimization of sampling conditions, have been previously investigated. Under optimal conditions, 51 and 42 aroma-active compounds were detected and characterized in zijuan and pu-erh green tea samples, respectively. Alcohols, ketones, and hydrocarbons were qualitatively the most dominant aroma-active compounds in zijuan and pu-erh green teas. The aroma-active compounds with similar sensory descriptors were grouped into the same category, and the sum of individual aroma intensity values within each category showed that the “floral” aroma, “woody” aroma, and “fruity” aroma in both zijuan and pu-erh green teas were the major aroma categories. These aroma notes were closely related to the characteristics of green tea aroma and its sensory perception.
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Food Analytical Methods
·
2016
·Vol. 10
·期 4
·931-942
·
IF 2.167
Feng Yunzi,Cai Yu,Sun-Waterhouse Dongxiao,Fu Xiong,Su Guowan,Zhao Mouming
A method based on simultaneous distillation extraction (SDE) coupled with gas chromatography–mass spectrometry/olfactometry (GC-MS/O) was developed for the analysis of volatile profiles in soy sauce. Its optimum operating conditions were as follows: 100 mL soy sauce plus 100 mL saturated brine; 2 h extraction using 50 mL dichloromethane. Eighty-eight volatile compounds were identified. Of these, 26 aroma-active compounds were detected by GC-O including 3-(methylthio)propanal, 2-methoxy-4-vinylphenol, 2-methoxyphenol, 2-methylbutanoic acid, 2,3-butanedione, phenylacetaldehyde, 2-ethyl-6-methylpyrazine, 3-methylbutanal, 2-methylbutanal, 3-methyl-1-butanol, and 2-methyl-1-butanol (which occurred at a high odor intensity in both high-salt liquid-state fermentation soy sauce (HLFSS) and low-salt solid-state fermentation soy sauce (LSFSS). SDE analysis of the odorless soy sauce indicated 12 volatiles (mainly Strecker aldehydes and α-dicarbonyl compounds). Thus, the proportions of these compounds (1.94–54.07 %) shown in previous GC-MS results could result from thermal degradation of non-volatile compounds in soy sauce. Especially, the contribution of 3-methylbutanal, 2-methylbutanal, phenylacetaldehyde, 3-(methylthio)propanal, and 2,3-butanedione to the aroma of soy sauce could be overestimated by conventional SDE-GC-O. With a full consideration of such limitations, this study will improve the application of SDE on aroma analysis of complex food matrix.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 11
·2826-2832
·
IF 5.256
Hang Ao,Hui Feng,Xiaolu Huang,Meizhi Zhao,Zhaosheng Qian
Dynamic covalent B–O bonds are introduced to the design of a reversible fluorescence nanoswitch in response to the external stimulus of pH. This nanoswitch is based on a phenylboronic acid functionalized carbon quantum dot (PBA–CQD) nanoprobe, and constructed with reference to the two facts that the PBA–CQD probe can bind to p-nitrophenol to form a non-fluorescent conjugate via B–O bonds, and that the making and breaking of the B–O bonds between them can be controlled by pH changes. Excellent reversibility of this nanoswitch is illustrated by switching of the pH from 4 to 8. The reaction between the PBA–CQD nanoprobe and the p-nitrophenol resulting in switching off the fluorescence is further utilized to design a general detection strategy for enzyme activity when substrates that can generate p-nitrophenol through enzymatic reactions are chosen. The feasibility of the detection strategy is qualitatively assessed using α-glucosidase and β-galactosidase, and its practicability to quantitatively monitor enzyme activity is also demonstrated by taking α-glucosidase as an example. The detection limit of this method can be as low as 0.33 U L−1, which is much lower than those reported previously and is sufficiently low to be capable of α-glucosidase level detection in practical human samples. This study demonstrates excellent usability of dynamic covalent B–O bonds in the design of reversible switches and in the general detection of enzyme activity, and provides a sensitive, real-time assay for α-glucosidase based on carbon quantum dots.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2400302
·
IF 18.5
Anding Xu,Mianying Huang,Chenxi Liu,Teng Li,Xue Li,Songping Wu,Zhiguang Xu,Yurong Yan
Constructing Sb atomic clusters with obvious size effect in Sb/C composites has great potential for boosting electrochemical reactivity toward ultrahigh rate and long-term sodium storage. However, how to balance the contradiction between ultra-small size of Sb atomic clusters and high loading in a specific Sb/C composite is an unprecedented challenge. Here, a facile in situ vaporization-reduction strategy is presented for preparing Sb atomic clusters@N, S co-doped carbon networks (Sb ACs@NSC). Featuring the high content of Sb atomic clusters (45.30 wt%, ICP) with superior electrochemical activity, robust Sb─O─C bond and N, S co-doped conductive carbon matrix, the Sb ACs@NSC electrode possessed ultrafast electrochemical kinetics and impressive long-term cycling stability for providing unprecedented rate capability of 245.7 mAh g −1 at ultrahigh rate of 80 A g −1 and maintaining highlighted capacity of 306.7 mAh g −1 after 1000 cycles under 10 A g −1 , outperforming all reported Sb-based materials for SIBs. The DFT calculations further revealed that the Sb─O─C bond and N, S co-doped carbon matrix are beneficial for stable adsorption capabilities and fast electrochemical kinetics of Na + . The designing compromised dense Sb atomic clusters and powerful interface bond will light on developing advanced atomic materials for energy storage and conversion.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Huan Liu,Jingyu Li,Yuping Zhang,Lin Li,Hansheng Gong,Lixuan Tan,Peng Gao,Pi Li,Jiangtao Xing,Bin Liang,Jianxun Li
Lipids are key aroma contributors in meat products. However, the role of different lipids in the presence of aroma compounds in roasted pigeons has not been studied. The formation of aroma compounds and lipids during the circulating non-fried roasting of pigeons was investigated. The results presented that 18 aroma compounds, including 5-methy-2,3-diethylpyrazine, were identified as key aroma compounds. A total of 6324 lipids were classed into 47 categories, such as phosphatidylcholine (PC), phosphatidylethanolamine (PE), and triglyceride (TG). Nine lipids, containing PA(P-20:0/22:4(7Z,10Z,13Z,16Z)) and LPC 16:0-SN1, showed promise as potential biomarkers for discriminating differential pigeons using OPLS-DA. PC (13.76%), TG (13.58%), and their products were major lipids, among which TG 16:0 16:0 18:2, LPC 18:2-SN1, and PC 18:1_18:1 played a crucial role in the presence of aroma compounds. Interestingly, the linoleic acid , an important aroma contributor, was predominantly bonded to the sn-2 position of phospholipid and sn-3 position of neutral lipids.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cong Yuan,Xiaoxiao Zhu,Jiaqi Pan,Minghao Xu,Yongjun Jiang,Sheng Dai,Yikai Huang,Leixi Lu,Lei Zhou,Chengcheng Tian
The understanding of how single atoms anchoring on oxides contribute to high-activity catalysis in the sulfate radical-advanced oxidation process (SR-AOP) remains obscure. Here we presented a new strategy for regulating singlet oxygen ( 1 O 2 ) generation in peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) by engineering the Co-O-X active sites on oxide supports in this study. The Co single atoms supported on mesoporous oxides (Co SA -XO 2 ) were first successfully developed using a modified sol–gel solvent vaporization self-assembly method. We found that Co SA -XO 2 catalysts served as efficient PMS activators for pollutant decomposition over a wide pH range. Notably, Co SA -TiO 2 exhibited exceptional performance, achieving nearly 100% removal of sulfasalazine (SSZ) within 10 min. Furthermore, evidenced by experimental results and density functional theory (DFT) calculations, 1 O 2 was confirmed to be predominately active oxidizing species by the unique Co-O-X bonds for activating PMS in Co SA -XO 2 /PMS system, resulting in an excellent pollution degradation. This study provides valuable insights into the construction of highly loaded single-atom catalysts using oxide substrates in the PMS-AOP system, along with the mechanism of regulating reactive oxygen species (ROS) formation through interfacial bonding between active metal and support.
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Desalination and Water Treatment
·
2024
·
IF 1
Xiaoxia Chen,Yu Ma,Zhengjie Su,Xinxin Zhang,Jinguo Lin,Xiaoyun Chen
Herrin, the lignin extracted from Rice hull , Phyllostachys edulis , Cunninghamia lanceolata, and Populus tomentosa Carrière were used as a soft support to grow Ti-doped Bi 2 (O,S) 3 bimetal oxysulfide catalysts, labeled BT-Rh, BT-Pe, BT-Cl, and BT-Ptc, respectively. The catalytic reduction activity was investigated through the decolorization of methyl orange (MO), methylene blue (MB), and reduction of Cr(VI) solutions under dark. The lignin-supported BiTiOS improved crystallinity, decreased aggregate size, increased specific surface area, and enhanced electrochemical active sites, leading to improve electron transfer and accelerated reduction rates. The catalytic reduction activity of organic dyes and Cr(VI) was significantly improved with lignin-supported BiTiOS. The 5 mg BT-Pe catalyst completely reduced 100 mL of 50 ppm MO, MB, and Cr(VI) solutions in 6, 6, and 18 min, respectively, with the reaction kinetic rate of 0.6782, 1.090, and 0.1189 min −1 , and demonstrated good durability, maintaining a reduction rate of 95 % after six cycles. This work provides a feasible approach combining biomass/inorganic materials to treat industrial wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhijie Zhang,Yilin Zhou,Xiaodong Zhang,Jixian Ma,Miaoning Yao,Jie Sun,Tong He,Xuexia He,Zhibin Lei,Ruibin Jiang,Zong-huai Liu,Qi Li
Na-rich manganese-based layered oxide cathodes have presented potential applications in high energy–density sodium-ion batteries due to their cost-effectiveness and large theoretical specific capacity. However, the low kinetics of anionic redox reaction and lattice distortion caused by the Mn 3+ Jahn-teller effect greatly hindered the actual capacity, rate, and cycling performances of these cathodes. Herein, a Li + substitution induced O3/O′3 biphasic tailoring strategy has been proposed for constructing the Na-rich NaLi 0.2 Mn 0.8 O 2 (NLMO) cathode. Compared with conventional O′3-Na 1.2 Mn 0.8 O 2 (NMO) cathode, the O3/O′3-NLMO cathode enabled to provide an ultrahigh capacity of 233 mAh g −1 , superior capacity retention of 86 % after 50 cycles, and outstanding rate performance with the recorded-up capacity of 165 mAh g −1 at a high current density of 200 mA g −1 . In addition, NLMO also displayed rapid Na + -diffusion and more structural reversibility of O3/O′3-P3-O1-P3-O3/O′3 during the entire charging and discharging processes. The above excellent performances of NLMO cathode could be attributed to the well-designed O3/O′3 biphasic structure that provides the synergistic function of drastically enhancing reaction kinetics of anionic (O − /O 2– ) couple and efficiently alleviating multiphase transitions caused by Mn 4+ /Mn 3+ cationic couple. This unique finding of Li + substitution induced biphasic structure provides an insight for developing economical and high-performance Na-rich oxide cathodes.
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