CHEMOSPHERE
·
2020
·
IF 5.778
Shengji Wu,Pengjie Yan,Wei Yang,Jie Zhou,Hui Wang,Lei Che,Pengfei Zhu
Capacitive deionization (CDI) is a promising method to remove metal contaminants in water. Herein, we report on the preparation of activated carbon from cation-exchange resin by introducing ZnCl 2 via ion exchange followed by heat treatment and CO 2 activation, which is evaluated for removal of Cu 2+ in water via CDI technology. The results have shown that both the heat treatment and the CO 2 activation are helpful to tune the pore structure of the activated carbons in terms of ions adsorption and transportation. The activated carbon prepared by heat treatment at 600 °C and CO 2 activation at 750 °C, named as AC-600-750, has the highest specific surface area of 1162 m 2 g −1 and a specific capacitance of 247.4 F g −1 at 50 mV −1 , with a Cu 2+ adsorption capacity of 77.8 mg g −1 at 1.2 V in 50 mg L −1 CuCl 2 solution that is much higher than that of the commercial activated carbon. The electrosorption of Cu 2+ ions over activated carbon follows a monolayer adsorption scheme, of which the kinetic can be well explained by pseudo-first-order kinetic model. The resin-based activated carbons are of potential as an electrode material for efficient removal of heavy metal from contaminated water by CDI process.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 5
·1293-1304
·
IF 3.709
Le-Yao Wang,Zhen Yang,Feng Guo,Xiang-Li Long
BACKGROUND 2-nitro-4-methylsulfonylbenzoic acid (NMSBA) is commercially produced from the oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) with nitric acid as oxidant and V 2 O 5 as catalyst in a strong acid solution; this process suffers from the following shortcomings: the discharge of large amounts of wastewater and waste gas, as along with the generation of polynitro compounds. It is necessary to develop a technology to avoid the pollution caused by oxidizing NMST with nitric acid. NMSBA can be synthesized by oxidizing NMST with air under the catalysis of the porous carbon made from coconut shell with ZnCl 2 as an activator together with Co/Mn/Br. RESULTS The optimum conditions for the preparation of the porous carbon are as follows: impregnation temperature 60 °C, ZnCl 2 concentration 0.50 mol L −1 , impregnation duration 6 h, carbonization temperature 600 °C, and carbonization time 4 h. The surface characterization suggests that the carbon made in this study holds smaller surface area, acidic groups, and basic groups than the commercial carbon but owns more carboxyl. CONCLUSION The Co/Mn/Br/AC (AC,the porous carbon made in this study) catalytic system is superior to the Co/Mn/Br/H 3 PMo 12 O 40 @CAC(CAC,commercial activated carbon) catalytic system in the production of NMSBA from the oxidation of NMST. The NMSBA selectivity gained by the former is 93.40%, while that gained by the latter is 87.14%. The former can cut down the consumption of NMST and the expenditure of catalysts. The catalytic ability of the AC catalyst relies on its surface chemical characteristics and physical properties. More carboxyl on AC is the reason for the upgrade of NMSBA selectivity. © 2022 Society of Chemical Industry (SCI).
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·533-541
·
IF 3.591
Mei-Jiao Zeng,Xiaofeng Li,Shu-Meng Hao,Jin Qu,Wei Li,Jing Wu,Tianyu Zhao,Zhong-Zhen Yu
Although wood-derived carbon (WC) and its derivatives are promising electrodes for supercapacitors because of their hierarchically porous architecture, superior mechanical flexibility, and environmental friendliness, pure WC electrodes usually exhibit poor wettability, inferior areal capacitance, and unsatisfactory electrical conductivity. Herein, hierarchically porous graphene/wood-derived carbon (GWC) aerogels are fabricated for high-performance supercapacitor electrodes by chemical reduction of graphene oxide/wood hydrogels, followed by directional-freezing, freeze-drying, and carbonization at 1000 °C. An activated GWC (AGWC) anode is prepared by activating GWC using ZnCl2 to create more mass transport paths and increase wettability, while the cathode is synthesized by in situ growth of NiCo2O4 (NCO) in the channels of GWC to bring about pseudocapacitance and increase energy storage sites. The resultant NCO@GWC cathode and AGWC anode exhibit superior capacitances of 8540 and 10 965 mF cm−2 (854 and 183 F g−1) at 1 mA cm−2, respectively. The assembled NCO@GWC//AGWC asymmetric supercapacitor exhibits a superior areal capacitance of 7116 mF cm−2 at 1 mA cm−2, a high energy density of 2.2 mW h cm−2 (5.6 mW h cm−3), a power density of 45.1 mW cm−2 (112.8 mW cm−3), and an excellent cycling stability of 100% capacitance retention over 1000 cycles at 10 mA cm−2.
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MOLECULES
·
2019
·Vol. 24
·期 24
·4534
·
IF 3.06
Yixin Cai,Liming Liu,Huafeng Tian,Zhennai Yang,Xiaogang Luo
Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl2were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m2g−1with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m3g−1, respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g−1under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by π–π interactions and cation–π bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.Keywords:adsorption;desorption;mechanism;sugar cane bagasse;activated carbons;tetracycline
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhichao Shang,Mi Feng,Ming Jiang,Zhencai Zhang,Sihao Liu,Shijie Wang,Fei Xu
Bisphenol compounds play a pivotal role as essential diol monomers in the synthesis of numerous engineering plastics. However, conventional methods for their preparation often involve the use of concentrated inorganic acids, leading to significant environmental pollution and equipment corrosion. Herein, we developed a strong inorganic acid-free synergistic catalytic system consisting of a Lewis–Brønsted acid catalyst composed of ZnCl2 and 3-mercaptopropionic acid. This system enabled the highly efficient preparation of bisphenol compounds through the Friedel–Crafts alkylation reaction of ketones with phenols or phenoxyethanol. The highest selectivity of 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene can reach 96.4% at 110 °C for 2 h, which was higher than that of the traditional sulfuric acid method with a selectivity of 85.0%. A mechanistic study revealed that the carbonyl group of the ketone was first activated by the coordination ability of Zn2+ from the Lewis acid, which facilitated the subsequent protonation process initiated by the acidic site of Brønsted acid.
研究领域:
化学
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催化
·
材料科学
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环境科学
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Fan Wang,HuaQing Zhang,ChunLing Liu,Wen Bao,YaJuan Hu,Xieraili Maimaitiyiming
PVA-based conductive hydrogels have enormous potential for applications in wearable flexible electronic devices, but their low ionic conductivity and mechanical strength hinder their practical utility. To address this challenge, we propose a PVA-based incorporating metal salt and zwitterion. We use PA(phytic acid) and HPMC (hydroxypropyl methylcellulose) - compatible properties to prepare PSBMA 1 -PMAZ 1.5 interpenetrating conductive hydrogel with good electrical signal responsiveness, repeatability, compression resistance, and low hysteresis (≤11.68 %). The hydrogel-based flexible strain sensor has a wide detection range, high sensitivity (GF = 1.1 at 0 − 600 %), stable electrical signal response to variations in temperature and humidity, and human movement detection capabilities. The detection range of hydrogel - based supercapacitors is 25 °C - 40 °C, which indicates that the device assembled with activated carbon as the electrode has good capacitance characteristics, and the multifunctional characteristics of PSBMA 1 -PMAZ 1.5 hydrogels are poised to serve as a demonstration for a new generation of flexible electronic products.
研究领域:
材料科学
·
生物医学工程
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Dequan Wei,Ying Chen,Shenghua Lv,Jingjing Zuo,Leipeng Liu,Yanlu Mu,Jinru Liu,Jiaqi Wang
Flexible smart sensing materials are gaining tremendous momentum in wearable and bionic smart electronics. To satisfy the growing demand for sustainability and eco-friendliness, biomass-based hydrogel sensors for green and biologically safe wearable sensors have attracted significant attention. In this work, we have prepared MCC/PAA/AgNWs/CNTs hydrogel sensors with excellent conductive sensing properties by a simple physical blending method. The ZnCl 2 solvent system was used to dissolve the MCC, followed by introducing acrylic acid to polymerize under UV illumination. Subsequently, CNTs and AgNWs were introduced into the hydrogel network to obtain hydrogel with excellent conductive sensing and antibacterial properties. Here, the physical and chemical interactions between the components significantly improved the mechanical properties of the hydrogels, exhibiting good tensile strength (0.45 MPa), elongation at break (558 %) and adhesion properties. Hydrogel presented outstanding electrical conductivity and significantly elongation sensitive (GF = 4.73 when elongated 90–120 %). Additionally, the hydrogel was also found to have significant antimicrobial activity against both Escherichia coli and Staphylococcus aureus , and the antibacterial effect was almost 100 %. With high sensitivity, stability, and reproducibility, these hydrogel strain transducers can detect various human movements, including finger flexion, wrist movement, joint motion, and heartbeat.
研究领域:
材料科学
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生物医学工程
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可持续发展
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 51
·2410305
·
IF 18.5
Yang Song,Yongduo Liu,Daojun Long,Xiongxin Tao,Shijian Luo,Yuran Yang,Hao Chen,Meng Wang,Siguo Chen,Zidong Wei
Zinc metal has emerged as a promising candidate for high-capacity and low-cost anodes in aqueous zinc-ion batteries; nevertheless, it encounters serious obstacles, including low cycling stability and poor reversibility, caused by parasitic reactions and the formation of zinc dendrites. Herein, the study proposes a novel nonprotonic dimethylacetamide (DMAC)/ZnCl 2 /LiCl electrolyte that enables both solvation structural modulation of [ZnCl x ] 2-x and the cationic electrostatic shielding effect of [Li(DMAC)] + by controlling the concentration of LiCl. The optimal concentration of LiCl electrolyte (0.28 m ), which results in the highest ratio of [ZnCl 3 ] − , strikes a balance between low desolvation energy and a high mass transfer rate while promoting homoepitaxial deposition of Zn (002). Moreover, inert [Li(DMAC)] + ions, which possess a lower reduction potential, preferentially adsorb onto zinc protrusions, mitigating the tip effect. Leveraging electrolyte engineering, the zinc deposition/stripping process results in impressive long-term stability, surpassing 2,800 cycles, and the Zn||MnO 2 cell also achieves a stable lifespan extending beyond 1400 cycles. The research highlights the potential of LiCl as an additive in the modulation of water-free electrolytes.
研究领域:
电化学
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储能
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电池材料
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水系电池
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材料科学
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ACS Omega
·
2020
·
IF 2.87
Bojuan Hao,Kaige Wang,Yukun Zhou,Chaofan Sui,Lei Wang,Ren Bai,Zhaojin Yang
DNA molecular compaction/decompaction is of great significance for the exploration of basic life processes, the research of biomedical and genetic engineering, and so forth. However, the detailed mechanism of DNA compaction/decompaction caused by surfactants remains an open and challenging problem that has not been fully solved so far. In this paper, a sort of novel solid substrate, nanoPAA-ZnCl2-AuLs, with good stability and high sensitivity, was prepared by a self-assembly method. Based on this substrate, the surface-enhanced Raman scattering (SERS) technology was employed to investigate characteristics of interactions between DNA molecules and surfactants at a single molecular level. SERS spectra of calf thymus DNA (ctDNA), cetyl trimethyl ammonium bromide (CTAB), and sodium dodecyl sulfate (SDS) with a concentration as low as 10–9 M, and SERS spectra of ctDNA–CTAB and ctDNA–CTAB–SDS composites were collected, respectively. The interactions between ctDNA and surfactants were analyzed by changes in SERS spectra, for example, disappearances and appearances of SERS bands and relative changes of peak intensity, in which CTAB resulted in the compaction of the DNA molecule while SDS induced the decompaction of the ctDNA–CTAB complex. Moreover, UV–visible spectrophotometry was employed to demonstrate the compaction/decompaction of ctDNA molecules caused by surfactants. The local binding modes of ctDNA molecules and surfactant molecules were expounded. This work will be helpful for understanding biological processes such as DNA compaction and recombination within nucleus or/and cells and for the development of gene therapy technologies.
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Nano-Micro Letters
·
2023
·Vol. 16
·期 1
·1-17
·
IF 26.6
Nan Jingya,Sun Yue,Yang Fusheng,Zhang Yijing,Li Yuxi,Wang Zihao,Wang Chuchu,Wang Dingkun,Chu Fuxiang,Wang Chunpeng,Zhu Tianyu,Jiang Jianchun
Solid-state zinc-ion capacitors are emerging as promising candidates for large-scale energy storage owing to improved safety, mechanical and thermal stability and easy-to-direct stacking. Hydrogel electrolytes are appealing solid-state electrolytes because of eco-friendliness, high conductivity and intrinsic flexibility. However, the electrolyte/electrode interfacial contact and anti-freezing properties of current hydrogel electrolytes are still challenging for practical applications of zinc-ion capacitors. Here, we report a class of hydrogel electrolytes that couple high interfacial adhesion and anti-freezing performance. The synergy of tough hydrogel matrix and chemical anchorage enables a well-adhered interface between hydrogel electrolyte and electrode. Meanwhile, the cooperative solvation of ZnCl 2 and LiCl hybrid salts renders the hydrogel electrolyte high ionic conductivity and mechanical elasticity simultaneously at low temperatures. More significantly, the Zn||carbon nanotubes hybrid capacitor based on this hydrogel electrolyte exhibits low-temperature capacitive performance, delivering high-energy density of 39 Wh kg −1 at −60 °C with capacity retention of 98.7% over 10,000 cycles. With the benefits of the well-adhered electrolyte/electrode interface and the anti-freezing hydrogel electrolyte, the Zn/Li hybrid capacitor is able to accommodate dynamic deformations and function well under 1000 tension cycles even at −60 °C. This work provides a powerful strategy for enabling stable operation of low-temperature zinc-ion capacitors.
研究领域:
材料科学
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电化学
·
能源存储
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Lin Yang,Yudong Fu,Honghai Liu,Qiaojun Nie,Ming Zhang,Zhongrong Shen
Zinc (Zn) metal anodes have been extensively investigated in aqueous Zn-ion batteries (AZIBs). Nevertheless, severe dendrite issues caused by uneven ion diffusion and Zn deposition greatly influence the stability and safety of AZIBs. Herein, a novel three-electrode tubular cell assembled from simple materials is constructed for both electrochemical measurement and visual characterization. Measured by the tubular cell, a water-in-salt electrolyte (WiSE) exhibits excellent ionic conductivity (33.29 mS cm–1) and reduced corrosivity, which is prepared by incorporating cellulose and polyethylene glycol (PEG) into concentrated zinc chloride (ZnCl2) solution. The results reveal that the functional groups of cellulose and PEG in WiSE can regulate the solvation structure of Zn2+, thereby alleviating consecutive side reactions and inhibiting the formation of byproducts. The inherent ion channels formed by the polymer chains and the physical barriers constructed by PEG on the Zn surface further facilitated the uniform deposition of Zn2+ along the (002) crystal plane, enabling the Zn symmetric battery to achieve an ultralong cycle life of 1000 h at a current density of 2 mA cm–2.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Xianen Hu,Yiqing Li,Jun Du,Jingxiang Sun,Chun He,Ya Xiong,Shuanghong Tian
Herein, a novel two-step ZnCl2–KOH activation process was developed to produce wheat bran-derived biocarbon (WBZ5K9) with an ultrahigh specific surface area of 3200.8 m2 g–1, a porous structure mainly containing micropores (0.5–2 nm) and mesopores (2.0–2.17 nm), a high graphitization degree (ID/IG = 0.9), and a good production yield of 21.4%. After further N-doping treatment, the obtained WBZ5K9-N had a similar textural structure but a high N content of 3.5 atom %. Owing to the well-developed pore structure and abundant active adsorption sites (i.e., graphitic carbon and nitrogen), both adsorbents showed ultrahigh adsorption capacities toward various pollutants without pH adjustment. Particularly, WBZ5K9-N presented adsorption capacities of 558.7–1965.3 mg/g toward 6 anionic dyes, 3 cationic dyes, and 4 antibiotics, ranking the top level among the known adsorbents. Finally, the synergistic chemisorption mechanism of electrostatic interaction, π–π stacking interaction, H-bonding, and N interaction was revealed. Such an activation method can be extended to prepare other waste biomass-derived carbons.
研究领域:
环境科学
·
材料科学
·
化学工程
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