ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Qianqian Zhao,Jiapei Yang,Jie Zhang,Datong Wu,Yongxin Tao,Yong Kong
Chiral recognition of l-amino acids is of significant importance due to the crucial role of l-amino acids in life sciences and pharmaceutics. In this work, a chiral sensor with capability of probing two chiral amino acids by an attractive single-template molecular imprinting strategy is introduced and used in the simultaneous chiral recognition of d/l-alanine (d/l-Ala) and d/l-tyrosine (d/l-Tyr). The assay relies on the hydrolysis of l-alanyl-l-tyrosine dipeptide doped in silica/polypyrrole (SiO2/PPy) under acidic conditions, resulting in l-Ala and l-Tyr coimprinted chiral sensor. This work opens up a new avenue for simultaneous chiral sensing of two or more chiral amino acids by incorporating only one template, circumventing the shortcomings encountered with multitemplate molecularly imprinted technology.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Mengmeng Cui,Xingjie Lu,Taofang Zeng,Olim Ruzimuradov,Dong Fang,Caiju Li,Fengxian Li,Yichun Liu,Rui Bao,Jianhong Yi
Copper vanadate materials have a higher gravimetric capacity and energy density than those of the traditional vanadium oxide or vanadate electrodes because of the multistep oxidation-reduction reactions. This work presents the synthesis of nano-structured copper vanadates using ion-exchange reaction of sodium vanadate nanowire arrays in an aqueous solution, containing copper acetate or copper nitrate. The morphology, crystal structure, composition and lithium-storage performance of the materials are measured and characterized thoroughly. Due to the dissolution effect of the acetate anion on the sodium vanadate nanowire arrays, copper vanadate spheres composed of nanosheets are produced. By contrast, after the ion-exchange reaction in the copper nitrate solution, the sample maintains its original nanowire arrays structure. The copper vanadate nanowire arrays synthesized in copper nitrate solution for 48 h followed with calcination at 300 °C for 2 h exhibit a remarkably high storage capacity of up to 997.76 mAh g −1 in 3–0.01 V versus Li/Li + , thus showing a great potential for application in lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Agricultural Science & Technology
·
2022
·
IF 0
Nimesh P. R. Ranasinghe Arachchige,Eric M. Brown,Ned B. Bowden
The slow release of hydrogen sulfide has been shown to be beneficial to plants by protecting them from environmental stressors, increasing germination, and extending the lifetime of harvested fruits. A major challenge in this field is controlling the amount and location of release of hydrogen sulfide so that it is available for use by plants at optimal amounts. This article reports a dual method to release hydrogen sulfide near the roots of plants by controlling its release using the hydrolysis of a dithiophosphate and the degradation of poly(lactic acid) [PLA]. Di(t-butanol)dithiophosphate phenylethylamine (tBDPA) was dissolved in a solution of PLA, and the solvent was allowed to evaporate. The resulting solid was crushed in a blender and separated into microparticles with two different size distributions of 250–500 or 500–2000 μm. The microparticles were characterized by powder X-ray diffraction to measure the presence of microcrystals of tBDPA within PLA, and images obtained using scanning electron microscopy with energy dispersive X-ray analysis confirmed the presence of these crystals. Microparticles of tBDPA loaded within PLA were characterized for their release of phosphorus and hydrogen sulfide, which both showed a burst release within 3 days, followed by a steady release. Radish plants grown with microparticles of PLA loaded with tBDPA had up to a 141% increase in harvest yield compared to plants grown in the presence of free tBDPA not loaded into PLA, PLA microparticles without tBDPA, and control plants grown without PLA or tBDPA. These experiments showed that loading hydrogen sulfide-releasing chemicals into PLA is a promising method to improve the effect of hydrogen sulfide on plants.
研究领域:
植物学
·
农业科学
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DOI
PubMed
iScience
·
2023
·
IF 5.8
Lingjun Zhu,Hao Xu,Xiaoyan Yin,Shurong Wang
With hydrothermal reaction, lignocellulosic biomass can be efficiently converted into furfural (FF) and levulinic acid (LA), both of which are key platform compounds that can be used for the subsequent preparation of aviation fuels. In order to reduce the acid concentration in traditional hydrolysis and provide a reaction system with good catalytic activity, we propose a biomass conversion route as dilute acid hydrolysis coupled with solid acid catalysis. Firstly, at different temperatures, the hemicellulose and cellulose in corn stover were step-hydrolyzed by sulfuric acid solution with a concentration of 0.9 wt. % to produce xylose and glucose, with conversion reaching 100% and 97.3%, respectively. Subsequently, a new resin-derived carbon-based solid acid catalyst was used to catalyze the aforementioned saccharide solutions to obtain FF with yield of 68.7 mol % and LA of 70.3 mol %, respectively. This work provides a promising approach for the efficient production of bio-aviation fuel precursors.
研究领域:
生物化学
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Minghua Nie,Wenjing Zhang,Caixia Yan,Wenli Xu,Leliang Wu,Yuping Ye,Yun Hu,Wenbo Dong
In this study, a favorable CO 3 2− /PMS system for efficient degradation of organic contaminants (acid orange 7 (AO7), acetaminophen, para -aminobenzoic acid, phenol, methylene orange, methylene blue) in water was firstly reported. Under optimal conditions, the decolorization ration of AO7 was 100% within 40 min. Data fitting showed that the AO7 decolorization could be described by the pseudo-first-order kinetics, and the rates constant values ranging from 0.0006 to 0.2297 min −1 depending on the operating parameters (initial PMS, CO 3 2− , AO7 concentrations). Radical scavenging studies revealed that superoxide anion radical (O 2 − ) and singlet oxygen ( 1 O 2 ) rather than sulfate (SO 4 − ) nor hydroxyl (HO ) were the dominant oxidants might be responsible for AO7 degradation. The presence of NO 3 − , HPO 4 2− and low concentration of Cl − , NO 2 − , HCO 3 − , H 2 PO 4 − , HA had no significantly effect on the decolorization of AO7. Adding a higher Cl − concentration displayed favorable effects on the removal efficiencies of AO7, but adding a higher NO 2 − , HCO 3 − , H 2 PO 4 − and HA concentration apparently inhibited this process. The decolorization of AO7 was lower in wastewater in comparison to other natural waters and ultrapure water, which was probably due to the presence of higher concentration of colloids in wastewater. Nevertheless, up to 94.8%, 97.0% and 85.1% of AO7 were degraded from the filtrate, permeate, and retentate phases of wastewater within 60 min, respectively. Consequently, CO 3 2− /PMS would be promising for removal methodology for AO7 in wastewater containing considerable colloids. Finally, three intermediates were identified and degradation pathways of AO7 were proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Yan-yan Huang,Jia-jia Yu,Qin-yu Zhou,Li-na Sun,Dong-mei Liu,Ming-hua Liang
Yogurt-flavored bases are widely used in food industry for enhancing flavors. In this study, yogurt-flavored bases by mixed lactic acid bacteria with or without lipase were investigated, which included Streptococcus lactis ACCC 11093 (SL) and Lactobacillus casei subsp. rhamnosus 6013 (LCR), SL and Lactobacillus acidophilus 1.1878 (LAP), and SL and Lactobacillus plantarum DMDL 9010 (LP), respectively. Compared with the combination of SL and LCR and the combination of SL and LAP, the combination of SL and LP had higher production of total amino acids , volatile acids and esters, suggesting that the combination of SL and LP was more efficient to produce yogurt-flavored bases. In addition, lipase significantly increased the production of amino acids associated with sweet and bitter flavors, and resulted in rougher milk globule surface and tighter network structure compared with fermentations without the addition of lipase. Furthermore, a total of 54 volatile compounds were detected in yogurt-flavored bases. The production of volatile compounds in fermentations with and without the addition of lipase, was mainly affected by acids and esters, respectively. Therefore, the lipase is a favorable supplement for producing yogurt-flavored bases.
研究领域:
食品科学
·
微生物学
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DOI
高影响因子
Journal of Saudi Chemical Society
·
2018
·
IF 2.456
Henghui Huang,Qi Yao,Qi Jiao,Bailing Liu,Hualin Chen
In order to improve the scale inhibition efficiency of existing polyepoxysuccinic acid (PESA) and to study the impact of their molecular structure on scale inhibition efficiency, a series of PESA with linear and hyper-branched structure have been designed and synthesized through co-polymerization reaction with glycidyl and epoxy succinate. The scale inhibition behavior of PESA with linear and hyper-branched structure against CaCO 3 and CaSO 4 scales was evaluated using static scale inhibition method, and their ability to retard deposition of CaCO 3 was also examined. The experimental results showed that, for CaCO 3 and CaSO 4 , the PESA with hyper-branched structure provides a scale inhibiting efficiency as high as 95.9% and 94.3%, respectively, at an inhibitor concentration of 15 mg/L. In addition, the processes of crystal nucleation, growth and crystal morphology have been analyzed. The experimental results show that the PESA with hyper-branched structure not only prolongs the induction period of CaCO 3 crystal nucleation, but also reduces the number of crystal nuclei and changes the size and morphology of the CaCO 3 crystal. Moreover, the FTIR, SEM and XRD analyses showed that the PESA with hyper-branched structure can induce the irregularity of growing CaCO 3 crystal, destroy the formation of crystals and change the polymorphs of calcium scale crystal. This conclusion indicates that the prepared PESA with hyper-branched structure has great potential for applying in the treatment of industrial water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 3
·677-690
·
IF 4.4
Chen Jun-nan,Xie Feng,Wang Wei,Fu Yan,Wang Jian,Xu Bin
Due to the high toxicity of cyanide, researchers are trying to find an environmentally friendly and sustainable leaching process for precious metals. Thiosulfate is considered one of the most promising alternative leaching systems. Nevertheless, a traditional thiosulfate leaching solution generally consists of copper sulfate and ammonia, in which copper sulfate acts as oxidant and ammonia acts as copper ion stabilizer. However, ammonia is another toxic reagent. For this reason, a novel and eco-friendly system of copper sulfate-tartrate-thiosulfate was investigated for silver sulfide leaching in this work. The effects of rotation speed, temperature, initial pH, copper sulfate, tartrate and thiosulfate concentrations and different atmospheres on the dissolution rate of Ag 2 S were examined. The process of silver sulfide dissolution is controlled by chemical reactions with an apparent activation energy of 43.49 kJ/mol. The reaction orders of silver sulfide leaching with respect to copper sulfate, tartrate, and thiosulfate concentrations in copper sulfate-tartrate-thiosulfate solutions are 0.491, 1.366, and 0.916, respectively. A detailed dissolution route of Ag 2 S was proposed based on XRD analysis of intermediate products such as Ag 3 CuS 2 , AgCuS and (Ag, Cu) 2 S. XPS analysis indicated that elemental sulfur was determined to be the final oxidant product of sulfur ions from Ag 2 S.
研究领域:
冶金工程
·
环境化学
·
材料科学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 10
·A2240
·
IF 3.014
Cheng Ma,Yuehong Shu,Hongyu Chen
An environmental friendly recycling process is investigated to recover lead as leady oxide from spent lead-acid battery paste. In this study, sodium oxalate as a desulfurizer and oxalate acid as a reducing agent have been used to leach three major components (PbSO4, PbO2 and PbO) respectively to obtain the optimal reaction conditions for real industrial spent lead paste leaching. In this sodium oxalate and oxalate acid leaching system, no extra reducing agent was needed any more to reduce PbO2. The results show that sodium oxalate exhibits much higher desulfurization efficiency for PbSO4, and PbO2 can be reduced easily in oxalate acid solution under the optimum conditions with an ratio of 1.25:1, an ratio of 2:1 at 60°C for 70 min. Lead oxalate precursor is calcined in air or N2, porous α-PbO is the only product in air and the calcination products are PbO and metallic Pb in N2 confirmed by morphology and structure characterizations, which is appropriate for lead-acid battery manufacturing. The recycling products were reused directly in lead-acid battery assembling as positive active materials and the assembled batteries show a good cyclic stability in 50 discharge/charge cycles.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Qing Cao,Biwu Chu,Peng Zhang,Qingxin Ma,Jinzhu Ma,Yuan Liu,Jun Liu,Yaqi Zhao,Hong Zhang,Yonghong Wang,Hong He
Nitrate photolysis is a vital process in secondary NOx release into the atmosphere. The heterogeneous oxidation of SO2 due to nitrate photolysis has been widely reported, while the influence of SO2 on nitrate photolysis has rarely been investigated. In this study, the photolysis of nitrate on different substrates was investigated in the absence and presence of SO2. In the photolysis of NH4NO3 on the membrane without mineral oxides, NO, NO2, HONO, and NH3 decreased by 17.1, 6.0, 12.6, and 57.1% due to the presence of SO2, respectively. In the photolysis of NH4NO3 on the surface of mineral oxides, SO2 also exhibited an inhibitory effect on the production of NOx, HONO, and NH3 due to its reducibility and acidic products, while the increase in surface acidity due to the accumulation of abundant sulfate on TiO2 and MgO promoted the release of HONO. On the photoactive oxide TiO2, HSO3–, generated by the uptake of SO2, could compete for holes with nitrate to block nitrate photolysis. This study highlights the interaction between the heterogeneous oxidation of SO2 and nitrate photolysis and provides a new perspective on how SO2 affects the photolysis of nitrate absorbed on the photoactive oxides.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Haoran Xv,Qian Zhang,Thiquynhxuan Le,Duclenh Phan,Libo Zhang
Ammonium persulfate has been proven to be effective in purifying thiosulfate (S 2 O 3 2− ) and sulfite (SO 3 2− ) impurities in desulfurization solutions. However, the sole use of ammonium persulfate as an oxidant faces the challenge of high oxidant consumption. In this study, a novel approach was proposed to enhance the oxidation efficiency of ammonium persulfate on sulfur-containing ions through ultrasonic activation. The results indicate that this technology has the advantages of high purification efficiency and low usage of ammonium persulfate. Specifically, the concentrations of S 2 O 3 2− and SO 3 2− decreased from 16.26 g/L and 38.30 g/L to 1.09 g/L and 8.89 g/L, respectively, meeting the actual production requirements; and the usage of ammonium persulfate could be reduced by 10–30 g per liter of solution compared with the case of ammonium persulfate alone. The introduction of ultrasound increased the generation of free radicals (SO 4 · − and ·OH), enhancing their oxidative capacity. The contribution of free radicals to the oxidation of S₂O₃ 2− and SO₃ 2− increased from 11.1 % and 9.8 % to 50.0 % and 25.8 %, respectively. This study reveals that the ultrasonic activated ammonium persulfate is expected to achieve efficient purification of the desulfurization mother liquor and reduce the addition of ammonium persulfate.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xin Zhang,Xin Liu,Ziting Lin,Guangze Sun,Zihan Bian,Huan Liu,Aihua Liu
Nanozymes hold great promise in catalysis-based sensing, however, challenges remain due to their less specificity and unclear catalytic mechanisms, which limited their potential applications. Herein we report an ultrasensitive colorimetric/fluorescence dual-mode tartaric acid (TA) sensor based on hydroxy-iron oxide (FeOOH) nanorods (NRs)@carbon dots (CDs) nanocomposite incorporating with acid phosphatase (ACP). The peroxidase (POD)-like activity of FeOOH can catalyze H 2 O 2 to generate OH, which can further oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue oxTMB, while the fluorescence of CDs can be quenched by the assembled FeOOH NRs through internal filter effect. The FeOOH@CDs can effectively transfer electron enabling high catalytic activity, which is supported by Cytochrome c as an electron transporter. ACP can hydrolyze trisodium L-ascorbate-2-phosphate salt (AAP) to produce ascorbic acid (AA), which increases colorimetric signal generated by FeOOH@CDs. Interestingly, TA can inhibit ACP activity through strong complexation and reduce the generated AA, by which most ox-TMB could not be restored. Meanwhile, the generated AA could reduce FeOOH to collapse into Fe 2+ , enabling the assembled CDs dropping-off into solution and restored fluorescence. However, TA can inhibit the ACP activity, which prevents fluorescence recovery. A colorimetric/fluorescence dual-mode sensing was established by cascading ACP/POD mimics. The limits of detection are 0.83 μM and 22.8 μM (3σ/S) for the fluorescence mode and colorimetric mode, respectively. The as-proposed method was applied to detect TA in wine samples, consistent well with the results of HPLC. This work not only expands nanozyme’s potential applications in catalysis and sensing, but also provides a potential platform for rapid TA detection for food control.
研究领域:
生物化学
·
传感技术
·
食品科学
✓ 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）