CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Guifang Wang,Guangchuan Liang,Huizhen Xiao,Jun Qiu,Haiyan Liu,Shaojian Ma,Sridhar Komarneni
The conventional environmental remediation materials, which are applied for the long-term treatment of mine tailings are easy to fail when affected by acid rain. Therefore, dynamic column simulation experiments were conducted to compare the immobilization persistence of As, Mn, Pb and Zn by the addition of triethylenetetramine modified montmorillonite (TTA-Mt) and calcium-based montmorillonite (Ca-Mt) in sulfide tailings during a simulated 5-year study of acid rain leaching. The structural and morphological characteristics of TTA-Mt were analyzed with FTIR, XRD, SEM, TEM and EDS. Results showed that the additions of TTA-Mt could persistently immobilize the heavy metal ions while Ca-Mt additions had little effect. After long-term simulated leaching for 5 years, TTA-Mt still had superior environmental stability for Zn and As with the immobilization rates of 96% and 86%, and the leaching amounts of Mn and Pb were less than 4.23 and 0.66 mg/kg, respectively. Morphology and chemical fraction analyses confirmed that the immobilization was mainly due to the formation of relatively stable phases by complexation and precipitation. Results presented here demonstrated the significant potential of TTA-Mt for long-term immobilization of heavy metals in tailings against acid rain and thus could provide guidance for remediation of tailings.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 7
·2481-2491
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IF 4.478
Li Yan-Jun,He Jia-Yuan,Li Qing-Yao,Yang Li-Li,Ma Rong-Rong,Wang Chong-Zhi,Zhou Lian-Di,Zhang Qi-Hui,Yuan Chun-Su
A novel deep eutectic solvent-magnetic molecularly imprinted polymer (DES-MMIP) for the specific removal of oxalic acid (OA) was prepared by an environmentally friendly deep eutectic solvent, consisting of betaine, citric acid, and glycerol, which acted as the functional monomer for polymerization. The structure and morphology of DES-MMIPs were studied by X-ray diffraction, scanning and transmission electron microscopy, thermal gravimetric analysis, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. DES-MMIPs had a core–shell structure, with magnetic iron oxide as the core, and showed good thermal stability and high adsorption capacity (18.73 mg/g) for OA. The adsorption process of OA by DES-MMIPs followed the pseudo-second-order kinetic model and Langmuir isotherm model. DES-MMIPs had significant selectivity for OA and their imprinting factor was 3.26. When applied to real samples, high performance liquid chromatography analysis showed that DES-MMIPs could remove OA from both spinach and blood serum. These findings provide potential methods for removal of OA from vegetables and for specific removal of OA in renal dialysis. Graphical abstract
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Biomass Conversion and Biorefinery
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2022
·Vol. 13
·期 17
·15837-15844
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IF 4.05
Di Junhua,Qin Lizhen,He Yu-Cai
A new type of metal-free solid acid catalyst ChCl:OA-SG(SiO 2 ) was firstly synthesized by loading deep eutectic solvent ChCl:oxalic acid on silica with sol–gel process using tetraethyl orthosilicate as silicon source. The properties of the catalyst were characterized by Fourier transform infrared spectrum, X-ray diffraction, scanning electron microscope, and Brunauer-Emmet-Teller. Highest furfural (FF) yield reached 41.2% from corncob with ChCl:OA-SG(SiO 2 ) catalyst (2.0 wt%) in water at 170 °C for 0.5 h. The catalytic mechanism of ChCl:OA-SG(SiO 2 )-catalyzed biomass into furfural was interpreted in the aqueous system. Corncob-valorized FF was wholly transformed to furfuryl alcohol with recombinant Escherichia coli CG-19 cells after bioreduction for 3 h of at 30 °C and pH 7.0. Yield of 0.416 g furfuryl alcohol/g xylan in corncob was obtained. This established hybrid catalysis could efficiently valorize biomass into value-added furfuryl alcohol.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Zhuozhi Ouyang,Fadan Lei,Endian Hu,Shuxing Li,Qian Yao,Xuetao Guo
Tetracycline (TC) and Mn(II) is a common antibiotic and metal ion respectively. Nevertheless, literatures involving in the effects of Mn(II) on TC transformation are still insufficient. In this study, the kinetic experiment, spectral analysis, complexation experiment and electrochemical analysis, theoretical calculation and products detection were carried out to probe into oxidation and photolysis of TC with Mn(II). Mn(II) greatly accelerated TC oxidation, preferably tending to complex with TC at O10 – O12 or O2 – O3 site. There were a TC-Mn(II)/TC-Mn(III) redox couple and electron transfer process. Conversely, Mn(II) inhibited photolysis of TC. The photolysis of excited TC could compete with energy dissipation reactions. The electron transfer and complexation reaction easily made excited TC energy transfer, thus slowing down photolysis process. During the TC transformation, the intensity of functional groups was significantly decreased. Simultaneously, the degradation pathways mainly included eight reactions. It is a very interesting and probably overlooked phenomenon, which identifies new transformation of TC with Mn(II). This study helps to further understand fate and environmental behavior of antibiotics and metal ion .
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ULTRASONICS SONOCHEMISTRY
·
2022
·
IF 9.336
Chen Xing,Wen-Qiang Cui,Yue Zhang,Xin-Shu Zou,Jing-You Hao,Si-Di Zheng,Ting-Ting Wang,Xiao-Zhen Wang,Tong Wu,Yan-Yan Liu,Xue-Ying Chen,Shu-Guang Yuan,Zhi-Yun Zhang,Yan-Hua Li
Licorice ( Glycyrrhiza glabra ) is extensively used owing to the superior pharmacological effects. However, its maximum application potential has not been fully exploited due to the limitation of currently available extraction solvent and methods. In this study, an eco-friendly deep eutectic solvent (NADESs) based ultrasound-assisted extraction (DES-UAE) method was applied to prepare licorice extracts. The DES-UAE using choline chloride and lactic acid as solvent was optimized and modeled by using response surface methodology to maximize the extraction yields of glabridin (GLA) and isoliquiritigenin (ISL). The optimized extracts possessed higher contents of GLA and ISL than available extraction methods, and the enriched products showed superior pharmacological activities in vitro. Furthermore, scanning electron microscopy (SEM) and molecular dynamic simulation analyses were performed to deeply investigate the interaction between solvent and targeted compounds. This study not only provides an eco-friendly method for high-efficient extraction of GLA and ISL from licorice but also illustrates the mechanism of the increased extraction efficacy, which may contribute to the application of licorice and deep insight into extraction mechanism using DES.
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JOURNAL OF AOAC INTERNATIONAL
·
2022
·Vol. 105
·期 5
·1350-1359
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IF 2.028
Xiang Yingying,Song Fei,Jiang Lei,Liu Ze,Tu Yujiao
BackgroundVB12 is involved in the production of bone marrow red blood cells, preventing pernicious anemia and brain nerve damage.ObjectiveA large edible fungus Lactarius hatsudake (Lh) was used as a carbon source to produce fluorescent carbon dots (CDs) with high quantum yield and high photostability by a one-step hydrothermal method.MethodThe structure and optical properties of Lh-CDs were characterized by XRD, XPS, FTIR, and UV-Vis, and the stability of Lh-CDs was studied. The maximum excitation wavelength and emission wavelength of Lh-CDs were 324 and 408 nm, respectively, and the average fluorescence lifetime was 2.29 ns.ResultsThe linear range is 0∼20 μM (R2 = 0.9972) with a detection limit of 36.9 nM. At the same time, the mechanism of fluorescence quenching was internal filtration effect.ConclusionsIt showed that Lh-CDS had good selectivity, high sensitivity, and good anti-interference ability to VB12, which provided a new detection method for VB12.Highlights The fluorescence intensity of the LH-CDs could be effectively quenched by VB12.HighlightsThe fluorescence intensity of the LH-CDs could be effectively quenched by VB12.
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INTERNATIONAL DAIRY JOURNAL
·
2022
·
IF 3.572
Hongbo Li,Yuanyuan Zhang,Chunshuang Li,Siyuan Xu,Wenbo Song,Hongjuan Li,Jinghua Yu
Maillard reaction products (MRPs), including 5-hydroxymethyl-2-furfural (5-HMF), glyoxal (GO), methylglyoxal (MGO), N ε -carboxymethyllysine (CML) and N ε -carboxyethyllysine (CEL), were examined by HPLC and ELISA in 5 commercial brown fermented milk products (BFM) from the market. Changes of MRPs in BFM were measured at 1, 7, 14 and 21 days of storage at 4 °C. Mean values of all brands for the sum of 5-HMF, GO and MGO; the sum of CML and CEL were 6.7 mg kg −1 and 140.3 μg kg −1 (first day), 7.1 mg kg −1 and 202.6 μg kg −1 (14th day), 7.56 mg kg −1 and 147.9 μg kg −1 (21st day), respectively. Slight increases of MRPs were observed in most of the studied BFM, which suggested that MRPs are produced during the storage period. The range of potential MRPs consumed for a person who drink BFM according to the Dietary Guidelines for Americans (2015–2020) was 1.7 mg and 8.3 mg per day.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Weidong He,Jianpo Chen,Qianyu Zhang,Hao Cui,Chengxin Wang
Reasonable structure design and fine electronic modulation are the keys to achieving the platinum-like hydrogen evolution reaction (HER) performance on Ru-based catalyst, but also challenges. Here, the integration of uniformly dispersed ultra-fine Ru nanoparticles with β-hexagonal ammonium tungsten bronze (β-HATB) nanowires is reported as an efficient acidic electrocatalyst. Due to the strong metal-support interaction, the surface charge state of Ru is effectively regulated, forming a mixed valence state composed of zero valence and offset state. The prepared Ru@β-HATB/CC exhibits a Pt-like catalytic activity with a small overpotential of 25 mV and a very low Tafel slope of 27.6 mV dec −1 . In-situ Raman spectroscopy and electrochemical analysis reveal that β-HATB does not directly participate in HER reaction and hydrogen spillover effect (H ads from β-HATB to Ru NPs) is not the main reason for the hydrogen evolution activity, but β-HATB can optimize the kinetics of hydrogen adsorption/desorption behavior on Ru surface and provide a stable and fast charge transfer channel, thus improving HER activity.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yong Cheng,Han-Qing Zhao,Aqiang Ding,Fei Chen,Jun Liu,Dazhi Fang,Chenglong Li,Yongkui Huang,Peili Lu
The widespread application of quaternary ammonium compounds (QAC) has posed a serious hazard to the environment and human being, and high concentration of Cl − in QAC wastewater may further increase the difficulty of pollutants elimination . In this study, such a QAC wastewater under high salinity conditions was chosen as the target, the prepared Ti/(Ru x Ir y )O 2 anode exhibited favorable catalytic performance for the oxidation and mineralization of QAC under high salinity conditions. Increasing the Ru/Ir ratio of Ti-based electrode coating also slightly promoted the inner catalytic capacity. The combination of electron paramagnetic resonance (EPR) and quenching experiments indicates that 1 O 2 served as a main reactive specie in the Ti/(Ru x Ir y )O 2 electrooxidation system. The increase of pH could decrease the removal efficiency of QAC for the reduced 1 O 2 yield, and the rise of Cl − concentration could favor the QAC oxidation, and Cl − was a better electrolyte to promote the oxidation of organic contaminants when compared to Na 2 SO 4 or Na 2 CO 3 . Additionally, the conversion pathway of the model pollutant was tentatively investigated, the results demonstrated that there were almost no halogenated final products residual by electrocatalytic oxidation with Ti/(Ru x Ir y )O 2 anode. This study not only elucidate the reaction mechanism of Ti/(Ru x Ir y )O 2 anode electrocatalytic oxidation of high salinity QAC wastewater, but also may provide an efficacious and eco-friendly method for the treatment of high salinity QAC wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Dandan Cui,Jin Yang,Bosi Lu,Lansheng Deng,Hong Shen
Mantis shrimp waste (Oratosquilla oratoria) is a good source of chitin. The applicability of microwave-assisted organic acids and proteases for extracting chitin from mantis shrimp shell waste was evaluated, and the extracted-chitin was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Moreover, the effects of nanochitin on the growth of pak choi ( Brassica campestris L.ssp.) were also investigated. The results indicated that alkaline protease (4000 U/g, microwave heating at 60 °C, 10 min) and malic acid (5%, 320 W, 5 min) exhibited excellent potential for deproteinizing and demineralizing shells. The deproteinization and demineralization yields were 92.78% and 94.11%, respectively, and the chitin yield was 15.6%. The extracted-chitin had a highly porous structure and exhibited excellent crystallinity and thermostability compared with chitin prepared by traditional chemical methods. Furthermore, 0.003% nanochitin significantly enhanced photosynthesis, which improved the pak choi fresh weight by 22.94%, and improved the accumulation of isothiocyanates in its leaves. This study provides an alternative approach for the high-value utilization of mantis shrimp waste, and reveals the potential of chitin for application in agricultural production.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhen Chen,Shipeng Geng,Juan Xiao,Fengyue Zhao,Kun Wang,Yi Wang,Panagiotis Tsiakaras,Shuqin Song
Herein, H 2 O 2 production activity via two-electron water oxidation reaction is identified on metal oxides (WO 3 , TiO 2 , and BiVO 4 ) in acidic SO 4 2− involving electrolyte, in which persulfate (PS) acts as an intermediate. A deep understanding of mechanism of PS production reaction on metal oxides has been realized based on rigorous crystal plane analysis of WO 3 and TiO 2 by combining density functional theory calculations and zeta potential measurements. It is found that the binding-energy of adsorbed hydroxyl groups on dominant exposed crystal plane of WO 3 is lower than that of TiO 2 , leading to more SO 4 2− adsorption sites at the surface of WO 3 . Consequently, the formation of PS on WO 3 surface is more favorable. Meanwhile, both SO 4 − · and OH· were detected in the electrolyte by electron paramagnetic resonance measurement, which play a crucial role in organic pollutants wastewater treatment, with a degradation efficiency of 96% in 90 min for a typical pollutant norfloxacin. This work can provide a novel insight for understanding the selectivity of water and SO 4 2− species oxidation on metal oxides, and open a new way for both on-site H 2 O 2 production and advanced oxidation processes application.
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Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 4
·714-721
·
IF 0.7
Han Jingliang,Chen Lian,Xu Zhengkai,Zhu Chengfei
Abstract Carbon steel was the most widely used grounding metal material. Polyaniline(PANI)/reduced graphene oxide (rGO) composite coating was prepared on carbon steel to optimize its performance by cyclic voltammetry for the first time in mixed solution of oxalic acid, aniline and rGO in this article. The structure and morphology of polyaniline were characterized by FTIR, XRD, and SEM. The effects of rGO doping on the conductivity and corrosion resistance of polyaniline were studied by polarization curve method and four probe method. The results showed that the PANI/rGO coating was successfully prepared on the surface of carbon steel. The PANI was continuously and densely covered on the surface of rGO as villous to reduce the porosity of the coating and improve the conductivity and corrosion resistance of the coating. The conductivity of the PANI coating increased from 3.33 to 23.05 S/cm after doping 10% rGO. The self-corrosion current density of PANI/rGO composite coated carbon steel in the soil decreased from 1.21 × 10 –3 to 5.19 × 10 –4 A/cm 2 and the corrosion inhibition efficiency was 57.1%.
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危险品化学品经营许可证（带存储）