NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 22
·10593-10603
·
IF 3.3
Hui Han,Man Zhang,Yingming Zhu,Kejing Wu,Yingying Liu,Binshen Wang,Houfang Lu,Bin Liang
Deep eutectic solvents (DESs) have the advantages of low cost, non-toxicity, and biodegradability for the catalytic conversion of fructose to 5-hydroxymethylfurfural (5-HMF). However, the efficient separation of 5-HMF from DESs is essential and challenging for its high-value utilization. In this study, the efficient separation of 5-HMF from eight carboxylic acid-based DESs was achieved by four cycles of extraction using tetrahydrofuran (THF) with an overall extraction efficiency of more than 80.0% (30 °C). Besides, the addition of 1 mol L−1 NaCl solution can significantly improve the extraction efficiency from 30.0% to 42.0%. In addition, the process of recovery and reuse of the extractant was proved to be quite effective, in which the purity of 5-HMF in the recovered product and the amount of THF in the recycled extractant can reach up to 90.0% and 97.0%, respectively. Finally, a thorough procedure for the preparation, separation, and recovery of 5-HMF was carried out to assess the viability of the optimized separation and recovery process. The results reveal outstanding extraction efficiency (77.9%), excellent yield of 5-HMF (63.3%), and high purity of 5-HMF in the final product (86.0%). This work expands the range of possible uses for 5-HMF by demonstrating an efficient and environmentally friendly method for separating and recovering 5-HMF while ensuring the reuse of the extractant.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mengmeng Yang,Lixia Yang,Zhaofeng Chen,Yang Ding,Lihao Liu,Wu Qiong,Tianlong Liu,Manna Li
Ceramic nanofibrous aerogels have attracted great interest because of their extraordinary multifunctional properties. Herein, a facile strategy was proposed to create SiO 2 nanofibers-BN nanoribbons assembled binary aerogel with excellent temperature-invariant super-flexibility, as well as low thermal conductivity , low infrared radiation and excellent sound absorption properties. In addition, the unique structure of the nanofibers-nanoribbon aerogel acts as the thermal insulation layer, combined with Al foil acting as an infrared reflection layer, forming a component that can effectively hide high infrared targets. The nanofibrous-nanoribbons binary aerogel possess low thermal conductivity (0.0288 W/(m⋅K)) and outstanding sound-absorption ability (NRC value of 0.43), as well as excellent infrared stealth ability, which makes it an ideal candidate for thermal insulation and sound absorption in multi fields.
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MOLECULES
·
2023
·Vol. 28
·期 7
·3279
·
IF 4.6
Xiaoxuan Li,Wenjie Sun,Yuhui Zheng,Chenggang Long,Qianming Wang
As a star material in conducting polymers, a polypyrrole coating was assembled onto the surface of 316 stainless steel by an electrochemical method. In the next step, the composite layer consisting of carbon nitride nanosheets (CNNS) and polymethyl methacrylate (PMMA) was sprayed. The corrosion manner of composite coatings in a simulated proton-exchange membrane fuel cell (PEMFC) environment was evaluated. The results show that the final coating generated at a voltage of 1.0 has demonstrated the optimized corrosion resistance. The polypyrrole layer improves the corrosion resistance of the stainless steel substrate, and the CNNS/PMMA coating further strengthens the physical barrier effect of the coating in corrosive solutions.Keywords:polypyrrole;inorganic;anti-corrosion;hybrid layer
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Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 11
·e202300146
·
IF 4.1
Wen-ting Zhao,Huan Zhang,Ke Feng,Tian-yang Wang,Lei Han,Hai-feng Xing,Fei Huang,Wen-bo Wang
Graphical A feasible “one stone, three birds” strategy was developed to achieve simultaneously the harmless disposal and reutilization of waste acid-leaching liquid, the synthesis of new materials and the efficient decontamination of dye or Cd(II) pollutants, by converting Al, Mg-rich waste acid leachate into silicate adsorbent. The adsorbent showed excellent adsorption performance and reusability towards cationic dye and Cd(II) in real waters. An emerging “one stone, three birds” strategy was proposed to realize the value-added disposal of solid waste coal gangue (CG), the synthesis of superb adsorbent and the efficient decontamination of pollutants (i. e., dyes, heavy metals). In this process, the metal ions extrated from calcined coal gangue (CCG) was reconstituted by a one-step hydrothermal process to yield porous polymetallic silicate adsorbent (named HECCGA8h). The adsorbent has a high adsorption capacity of 270.27 and 185.53 mg/g for methylene blue (MB) and Cd(II), respectively. In the actual waters, the removal rate of MB by this adsorbent reaches 99.8% (in Yangtze River water) and 99.42% (in Seawater), and the removal rate of Cd(II) reaches 99.11% (in Yangtze River water) and 92.52% (in Seawater), respectively. Thermokinetic analysis showed that the adsorption of MB by HECCGA8h is spontaneous and endothermic with increased entropy, and the adsorption of Cd(II) is spontaneous and exothermic. The adsorption of MB is mainly driven by synergism of hydrogen bond, electrostatic attraction and ion exchange, and the adsorption of Cd(II) is mainly driven by the complexation and ion exchange between the surface group of the adsorbent and Cd(II). This research provides a new way for the realization of “treating waste with waste”.
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Frontiers in Materials
·
2023
·
IF 3.2
Ye Chao,Li Chengui
A type II band aligned BaTiO3/CeO2 photocatalysts was constructed by a simple one-step solution synthesis method. The BaTiO3/CeO2 photocatalysts contain only cubic phase BaTiO3 and CeO2, and the particles are approximately spherical with a small amount of adhesion and agglomeration, and the average particle size is about 50 nm. Transmission electron microscopy (TEM) observation and element Mapping characterization confirmed the formation of special heterojunction between BaTiO3 and CeO2 and the presence of a large number of oxygen vacancies, which resulted in high visible optical absorption coefficient. The BaTiO3/CeO2 photocatalysts demonstrated high photocatalytic activity for the degradation of oxytetracycin hydrochloride, and the optimal drug concentration, catalyst content and pH value are 50 mg/L, 1 g/L and 7, respectively. Simultaneously, the BaTiO3/CeO2 photocatalysts were selective for degradation of aureomycin hydrochloride, doxycycline hydrochloride and tetracycline hydrochloride. Other photocatalytic experiments show that the BaTiO3/CeO2 photocatalysts have high chemical and cyclic stability, and the synergistic effect of holes, hydroxyl radicals and superoxide radicals plays an important role in the whole photocatalytic process. This simple synthesis route provides a technical reference for constructing other wide-band gap semiconductors to respond to simulated sunlight.
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PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Peiyi Wang,Baoming Tian,Zhiwei Ge,Jicai Feng,Jian Wang,Kai Yang,Peilong Sun,Ming Cai
Ultrasound and deep eutectic solvent (DES) are two green and efficient techniques in extraction. In this study, an eco-friendly extraction of phenolic compounds from Dendrobium officinale leaves (DOLs) was investigated. Ten DESs containing choline chloride, betaine , organic acids, polyols and amide, were tailored for extraction. Choline chloride-oxalic acid showed the most promising efficiencies for phenolics as 9.84 ± 0.19 mg GAE/g DW. Ultrasound-assisted DES (UADES) were optimized by a Box-Behnken design of response surface methodology. The optimum conditions were ultrasonic power 330 W, extraction temperature 60 ℃, and liquid-solid ratio 53:1 mL/g with a total phenolic content (TPC) of 17.50 ± 0.35 mg GAE/g DW. Compared with a single or triple frequency ultrasound, a dual-frequency of 40/60 kHz treatment for 15 min made TPC up to be 25.15 ± 1.46 mg GAE/g DW. About 13 phenolics were identified by UPLC-Triple-TOF/MS as the crucial phenolics in extracts , such as rutin and apigenin flavonoids . In addition, leave surface changed dramatically by UADES. These phenolic extracts had eminent antioxidant capacities, such as DPPH• scavenging rate of 65.4% and FRAP value of 0.234 mmol/L FeSO 4 at TPC of 4 mg/mL. Accordingly, dual-frequency UADES is a meaningful and green technology for extraction of phenolic compounds.
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 1
·299-308
·
IF 2.5
Xu Qingbo,Wang Xinyu,Zhou Jing,Wang Peng,Zhang Yanyan,Chen Qian
Improving the surface roughness of cotton fabric is one of the main strategies to prepare superhydrophobic cotton fabric. To improve the surface roughness of fabric, it is advisable to immobilize inorganic/organic particles on the surface of cotton fabric. However, the durability of the superhydrophobic cotton fabric is very poor due to the inorganic/organic particles are easily detachable from the fabric surface. In this work, a mild eutectic solvent prepared by choline chloride and oxalic acid was used to etch the cotton fabric, making the surface of the cotton fabric have many ravines. These ravines on the cotton fabric can be used the embedded the silica particles, thus making the silica particles firmly immobilized on the cotton fibers. Then, the treated cotton fabric was coated with polydimethylsiloxane (PDMS). As a result, the water contact angle of the finished fabric was reached at 156.9°. In addition, the superhydrophobic cotton fabric constructed by silica particles and PDMS via “Mosaic Mode” showed excellent mechanical and chemical stability. Therefore, the finished fabric has great potential application in the self-cleaning and oil–water separation fields.
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HYDROMETALLURGY
·
2022
·
IF 4.217
Jiadong Liu,Tsz Yau Mak,Zhe Meng,Xuyang Wang,Yulin Cao,Zhouguang Lu,Dawson Wai-Shun Suen,Xiao-Ying Lu,Yuanyuan Tang
Rechargeable lithium-ion batteries (LIBs) have been widely used in consumer electronics and electric vehicles . In terms of environmental restrictions and circular economy , proper treatment of spent LIBs is of great significance for achieving sustainable development. In this study, organic p -toluene sulfonic acid (PTSA) was employed to recycle valuable Li and Co elements from the spent LIBs for production of battery raw materials (e.g. Li 2 CO 3 and Co 3 O 4 ). Operation parameters such as PTSA concentration, hydrogen peroxide (H 2 O 2 ) concentration, solid-to-liquid ratio, leaching temperature and leaching time, were systematically investigated. Under the optimal conditions (0.9 vol% H 2 O 2 , 1.5 mol L −1 PTSA, 30 g L −1 solid-to-liquid ratio, 80 °C, and 60 min), the leaching efficiencies of commercial LiCoO 2 could reach ∼100% and 99% for Li and Co, respectively, while the corresponding values were about 95% and 93% for the spent LiCoO 2 . In addition, the selective precipitation of Co-rich compounds in cooled leachate allowed an effective separation of Co from the mixture. The high recovery yield of Co 3 O 4 and Li 2 CO 3 demonstrated the great potential of the PTSA-assisted leaching strategy in hydrometallurgical recycling of the spent LIBs for practical applications. Overall, this proposed recovery process is simple, efficient, and environmentally friendly and is of vital importance for rational treatment of spent LIBs.
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CHEMOSPHERE
·
2022
·
IF 8.943
Cheng Peng,Kailin Gong,Qiannan Li,Weiyu Liang,Huihui Song,Fang Liu,Jie Yang,Wei Zhang
Magnesium-aluminum modified biochar (MABs) has an outstanding effect on the simultaneous immobilization of arsenic (As), lead (Pb), and cadmium (Cd) in soil, but the stability of remediation effect of MAB under various natural conditions is still unknown. In this study, we investigated the effects of organic acids, dry-wet cycles (DW), freeze-thaw cycles (FT), and rainfall (pH 4, 7, and 8) on the immobilization of As, Pb, and Cd by MAB. The results showed that oxalic acid decreased the immobilization efficiencies of As, Pb, and Cd by 15.5%–38.5%; meanwhile, humic acid reduced the immobilization efficiency of Pb by 89.7%, but elevated that of Cd by 19.5%. The immobilization mechanisms of MAB-5 on three metals were mainly involved in ion exchange and surface-complexation. Compared with the 7th round, the immobilization efficiencies of As, Pb, and Cd by MAB in the 28th round was decreased by 17%–28% in DW, but was increased by 11%–18% in FT. In addition, MAB was transformed into hydrotalcite after FT and DW. After experiencing simulated rainfall, MAB caused more As, Pb, and Cd to be retained in the upper soil layer, and the immobilization effect of MBA was more significant under the stimulated rainfall with higher pH. The study provides a more theoretical basis for the application of MAB in the actual site remediation.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4302-4309
·
IF 11.9
Menghan Yu,Nan Wang,Kuo Lin,Dongxue Song,Jie Chen,Teng Liang,Jianhui Sun,Kai Pan,Honggang Fu
Photocatalytic selective oxidation of benzyl alcohol into benzaldehyde at normal temperature and pressure is one of the important topics in the catalysis field. Here, a lead-free double perovskite Cs2AgBiBr6 nanocrystal/mesoporous black TiO2 composite was prepared by a vacuum-assisted method, and then it was applied for photocatalytic selective oxidation. The photocatalytic oxidation of benzyl alcohol to benzaldehyde was found to occur with 75% conversion and 99% selectivity with the Cs2AgBiBr6 nanocrystal/black TiO2 composite, which were better than those of single Cs2AgBiBr6 nanocrystals and black TiO2, respectively. This was due to the formation of a Z-type heterogeneous structure between Cs2AgBiBr6 nanocrystals and black TiO2, which effectively promoted the separation and transfer of electrons and holes, ultimately leading to excellent photocatalytic activity. During the whole catalytic process, carbon-centered radicals were the key intermediates for the dehydrogenation of benzyl alcohol. This work may provide some practical suggestions for the fabrication of benzyl alcohol selective oxidation photocatalysts.
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Foods
·
2022
·Vol. 12
·期 1
·101
·
IF 5.561
Shiyao Zhang,Yue Xiao,Yongli Jiang,Tao Wang,Shengbao Cai,Xiaosong Hu,Junjie Yi
The effects of (fresh/aged) brine and (pool/jar) containers on the flavor characteristics of pickled chili peppers were investigated based on a multivariate analysis integrated with kinetics modeling. The results showed that the effect of brine on organic acid, sugar, and aroma was more dominant than that of containers, while free amino acids production was more affected by containers than brines. Chili pepper fermented using aged brine exhibited higher acidity (3.71–3.92) and sugar (7.92–8.51 mg/g) than that using fresh brine (respective 3.79–3.96; 6.50–9.25 mg/g). Besides, chili peppers fermented using pool containers showed higher free amino acids content (424.74–478.82 mg/100 g) than using a jar (128.77–242.90 mg/100 g), particularly with aged brine. As for aroma, the number of volatiles in aged brine was higher (88–96) than that in fresh brine (76–80). The contents of the esters, alcohols, and ketones were significantly higher in the aged brine samples than those in fresh brine (p< 0.05), while terpenes in chili pepper fermented using the pool were higher than those using the jar. In general, jar fermentation with aged brine contributed more flavor to pickled chili peppers than other procedures.Keywords:fermented chili pepper;flavor;brines;containers;multivariate data analysis
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guoshen Yang,Xianqi Xu,Gangrui Qu,Jie Deng,Yachao Zhu,Chi Fang,Olivier Fontaine,Pritesh Hiralal,Jiaxin Zheng,Hang Zhou
The earth-abundant magnesium resource and aqueous electrolyte make aqueous magnesium-ion batteries (AMIBs) a promising post-lithium-ion battery technology to synchronously address cost and safety concerns. Nonetheless, the freeze issue of aqueous electrolytes is curbing the development of AMIBs working at low-temperature conditions. Here, we report an MgCl 2 solution having a great low-temperature property via anion and concentration adjustment, which roots in the variation of the pristine hydrogen bond reticulation. Consequently, a 4 M MgCl 2 aqueous electrolyte endows a low freezing point (−62 °C) as well as ultra-high ionic conductivity (2.77 mS/cm at −50 °C). By using 4 M MgCl 2 as an electrolyte, the MnO 2 //VO 2 battery is capable of working in a wide temperature range from +25 to −50 °C, achieving a high discharge capacity of 97.9 mAh/g (0.1 A/g) and a high cycling capability of 1000 cycles (∼90 % capacity retention at −20 °C). Furthermore, MgCl 2 can be well compatible with polyacrylamide into an outstanding hydrogel electrolyte (in terms of mechanical property, anti-freeze performance, and high ionic conductivity) for a flexible quasi-solid-state MIBs application. The assembled flexible device attains appealing electrochemical properties across a broad temperature region, while the constructed pouch cell demonstrates superior flexibility and reliable safety. Our current exploration depicts an expeditious but productive paradigm for devising the high-performing AMIBs for low-temperature energy storage sectors.
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