Desalination and Water Treatment
·
2024
·
IF 1
Xiuying Fang,Min Yang,Jiaxiong Li,Mu Xiang,Kaini Yang,Hongbin Wang,Guizhen Li
The bamboo activated carbon (BAC) was prepared from bamboo charcoal, a commercial product, using microwave radiation with water vapour activation. The surface chemistry and physical characteristics of BAC were investigated by scanning electron microscope (SEM), Brunauer-Emmett-Teller surface area (BET) analyzer, X-Ray Diffraction (XRD), Thermogravimetric differential scanning calorimetry (TG-DSC) curve and fourier transform infrared spectroscopy (FT-IR). The BAC was used for the removal of p-nitrophenol in water. The operational variables including adsorbent dosage, pH, concentration and temperature of solution on the adsorption processes were studied. The BAC regeneration experiments were also carried out. The results showed that the iodine adsorption value was 1099 mg/g and the carbon yield was 34.3% under the optimum conditions. The BAC had a specific surface area of 1168.72 m 2 /g, total pore volume of 2.203 mL/g and micropore volume of 0.444 ml/g. The removal rate could reach 84% under the BAC dosage of 30 mg and p-nitrophenol solution pH of 5.33. The results of kinetic studies and isothermal adsorption model showed that pseudo-second-order kinetics and Langmuir isothermal adsorption model was well fitted the adsorption equilibrium process. After four times of regeneration, the removal rate could still reach 72%.
研究领域:
环境科学
·
材料科学
·
化学工程
·
吸附技术
·
环境污染治理
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2019
·Vol. 145
·期 12
·04019083
·
IF 1.657
Yuechao Zhang,Dian Yang,Ping Ning,Yingjie Li,Senlin Tian,Junjie Gu
The aim of this work was to study the supercritical water (SCW) regeneration of phenol-saturated activated carbon (AC) with the H2O2 and alkali metal catalyst (Na2CO3, NaOH, K2CO3, and KOH) addition. The results showed that SCW could effectively regenerate AC in the 385–425°C range without any additives, but large and small amounts of phenol and dibenzofuran were present in the liquid phase, respectively, which would result in secondary pollution. The H2O2 addition enhanced the decomposition of phenol and increased the CO2 yield. With the addition of H2O2 and an alkali metal catalyst, SCW further decreased the phenol and dibenzofuran yields but increased the H2 and CO2 yields. Active component-supported (Cu-Ce-O, Fe-Ce-O, Ni-Zn-Pt, and Ni-Co-Pt) AC adsorbents might have decomposed some of the phenol during the phenol adsorption process, which resulted in relatively small amounts of phenol adsorbed on the AC and a decrease of the liquid (phenol and dibenzofuran) and gaseous (H2 and CO2) yields. SCW regeneration increased the surface area and pore volume of the AC and raised the adsorption capacity. The H2O2 and alkali metal catalyst addition can be used to achieve the rapid, efficient, and harmless regeneration of AC in SCW at a lower temperature (385°C).
研究领域:
环境工程
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化学工程
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材料科学
·
污染控制
·
绿色化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 5
·1543-1551
·
IF 4.831
Liu Ren,Zeng Xuebiao,Liu Jingcheng,Luo Jing,Zheng Yuanyi,Liu Xiaoya
The article describes an electrochemical sensor for simultaneous determination of dopamine (DA) and paracetamol (PAT). It is based on the use of an electroactive polymer (referred to as BPVCM) to functionalize multi-walled carbon nanotubes. BPVCM is a branched amphiphilic photo-sensitive and electroactive polymer that was obtained by copolymerization of a vinyl benzylcarbazole, maleic acid anhydride, 4-vinylbenzylthiol and a vinylbenzyloxycoumarin. BPVCM efficiently disperses MWCNT in aqueous solution. The electropolymerization of the carbazole moieties of the BPVCM enhances the current response. It also facilitates electron transfer in the MWCNT-BPVCM hybrid as evidenced by cyclic voltammetry and electrochemical impedance spectroscopy. A glassy carbon electrode modified with the nanocomposite displays outstanding electrocatalytic activity towards DA and PAT. DA can be determined, best at a working voltage of 0.2 V (vs. SCE), in the 5 to 1000 μM concentration range with a 2.3 μM detection limit. PAT can be determined in parallel, at a working voltage of 0.39 V (vs. SCE), in the same concentration range with a 3.5 μM detection limit. This analytical range of this method is wider than that of most alternative methods.
An electrochemical sensor for simultaneous determination of dopamine (DA) and paracetamol (PAT) is described. It is based on the use of an electroactive polymer (referred to as BPVCM) to functionalize multi-walled carbon nanotubes. The electropolymerization of BPVCM enhances the current response and improves the analytical range of the sensor.
研究领域:
分析化学
·
生物医学工程
·
药物分析
·
纳米材料科学
·
电化学
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 12
·11953-11960
·
IF 1.5
Benzhi Liu,Jinlong Yan,Min Wang,Xiangyang Wu
Molecularly imprinted polymers were prepared on the surface of acrylamide-functionalized multi-walled carbon nanotubes by thermal polymerization, which using nonylphenol as template molecule, methacrylic acid as functional monomer and ethyleneglycol dimethacrylate as crosslinking agent. The molecularly imprinted polymers were modified on the surface of glassy carbon electrode to prepare electrochemical sensor. The proposed sensor showed a linear range of 0.1 to 30 μM with a detection limit of 0.02 μM. The sensor exhibited good stability, selectivity and high sensitivity to nonylphenol detection. It was successfully applied to detect nonylphenol in water samples.
研究领域:
分析化学
·
环境监测
·
材料科学
·
电化学
·
传感器技术
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Xia Zhang,Qiumin Cao,Zhuohuan Guo,Meiyue Zhang,Meng Zhou,Zhenzhen Zhai,Yuandong Xu
MoS 2 nanosheet arrays grown on functional pomelo peel derived carbon (PPC) is constructed via in situ self-assembly method. The obtained MoS 2 /PPC composite is further used to fabricate electrochemical sensor for taxifolin detection. The current response of taxifolin on MoS 2 /PPC is significantly enhanced due to the synergistic effect between MoS 2 and PPC. It is found that the charge transfer impedance and the Ohmic resistance corresponding to MoS 2 /PPC are the lowest, indicating fast electron transfer rate and good conductivity. Further investigation reveals that the redox peak current is linearly related to the concentration of taxifolin in the range of 7 × 10 −8 –1 × 10 −5 mol·L −1 and the limit of detection is calculated to be 2.3 × 10 −8 mol·L −1 (S/N = 3). In addition, no obvious interfering phenomenonhas been observed in the detection process of taxifolin, demonstrating that MoS 2 /PPC presents good selectivity toward taxifolin determination.
研究领域:
材料科学
·
电化学
·
分析化学
·
纳米技术
·
生物传感器
·
环境监测
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Yahui Li,Haoqiang Wang,Bo Yan,Huayu Zhang
Bisphenol A (BPA) is an effective endocrine-disrupting compound (EDC) that causes adverse effects on human health and environment. Therefore, it is indispensable to construct efficacious methods for evaluating the level of BPA to enhance the quality of life. In this study, a facile electrochemical sensor based on reduced graphene oxide-silver/poly- l -lysine nanocomposites (RGO-Ag/PLL) modified glassy carbon electrode (GCE) is proposed for the detection of BPA. The synthesized RGO-Ag/PLL nanocomposites displays high electrocatalytic activity towards the electrochemical oxidation of BPA. Differential pulse voltammetry (DPV) is used as an analytical method for the quantitative determination of BPA, and the fabricated electrochemical sensor exhibits a linear response to BPA in the range of 1–80 μM with the limit of detection (LOD) of 0.54 μM at a signal-to-noise ratio of 3. Additionally, the developed RGO-Ag/PLL/GCE sensor is applied to detect the BPA in drinking water , and obtains satisfactory results.
研究领域:
环境科学
·
分析化学
·
生物医学工程
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-7
·
IF 2.8
Wu Fang,Pu Zejun,Hou Hongbo,Li Xianyong,Zhu Rongli,Wang Xu,Yu DaYang,Zhong Jiachun
Bioderived polycarbonate (ISB-PC) was synthesized via transesterification and polycondensation of isosorbide (ISB) and diphenyl carbonate (DPC) using lithium acetoacetone as a catalyst. The resulting ISB-PC exhibited high glass transition temperatures similar to bisphenol A polycarbonate (BPA-PC) and was thermally stable up to 350 ℃. The incorporation of isosorbitol into the polymer chain imparted an improved mechanical property of ISB-PC, such as a higher bending and tensile modulus and higher elongation at break. ISB-PC can be readily cast into transparent films with a tensile strength of 73.3 MPa and a tensile modulus of 534 MPa. ISB-PC displayed high UV transmittance and possessed blue fluorescence under UV irradiation. At the same time, ISB-PC also has strong anti-yellowing ability.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Gaoming Li,Yeping Wu,Ping Zhang,Xiuli Zhao,Sixun Zheng,Yinyu Zhang
Bonding is widely used in aircraft and vehicles due to its light weight and simple process, but its strength decreases sharply in hot and humid environments. Anodization treatment, used for enhancing aging performance, is environmentally harmful and unsuitable for steel. In this study, a catechol-modified epoxy adhesive (CMEA) was prepared on a hectogram scale. Comparative analysis with phenol-modified epoxy adhesive (PMEA) and pristine epoxy adhesive (EA) revealed that the underwater bonding of CMEA (13.0 MPa) on stainless steel (SS) significantly outperformed the two control groups. Moreover, after 32 days of hydrothermal aging at 50 °C, CMEA preserved 73.9% of its initial bonding strength, while PMEA and EA retained 59.8 and 11.4%, respectively. Furthermore, X-ray photoelectron spectroscopy (XPS) etching at different times to analyze the interface between adhesives and the SS substrate indicated a marked increase in the O–H/O2– value at the interface between CMEA and the SS substrate compared to the two control groups. The above results demonstrated that the catechol-modified adhesive enhanced the bonding and aging properties of the adhesive, possibly due to the formation of a higher density of hydroxyl groups at the interface between the adhesive and the SS substrate. These findings contribute to the understanding of the enhancement mechanism of catechol in improving the bonding and aging properties of adhesives and suggest a feasible direction for designing adhesives with high bonding strength and high durability.
研究领域:
材料科学
·
粘接技术
·
表面化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Ping Shao,Ben Niu,Hangjun Chen,Peilong Sun
Edible packaging films using polymer for food preservation have been developed for a long time. In this study, the effects of different concentrations (0.5%, 1%, 1.5%, w/v) of tea polyphenols incorporated into pullulan-Carboxymethylcellulose sodium (Pul-CMC) solutions on electrospun nanofiber films were evaluated. The fiber size distribution was characterized by scanning electron microscopy. The morphological features of nanofibers were modulated through adjusting process parameters (e.g. concentration of polymer solution, applied voltage and feeding rate). Increasing the applied voltage from 19 to 21 kV and the feed rate from 0.36 to 0.6 mL/h leads to a reduction in mean fiber diameter. Fruit packaging potential was evaluated using strawberry. The pullulan-CMC-TP nanofibers significantly decreased weight loss and maintained the firmness of the strawberries, and improved the quality of the fruit during storage. The findings demonstrate a facile packaging route to improve food sustainability and reduce waste.
研究领域:
食品科学
·
材料科学
·
高分子化学
·
农产品贮藏与加工
·
功能食品
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Ren Liu,Junchao Zheng,Ruixi Guo,Jing Luo,Yan Yuan,Xiaoya Liu
A series of biobased UV-curable antibacterial resins were synthesized through modifying tannic acid (TA) with varied amount of glycidyl methacrylate (GMA). The obtained TA-based methacrylates exhibited good film-forming property and can be cross-linked under UV irradiation. Thus, antibacterial functionalities can be tethered in the coating matrix, eliminating the loss of antibacterial ingredients. The antibacterial properties of resins and corresponding coatings against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli were tested. The resins with high content of phenolic hydroxyl groups retained strong antibacterial ability while the ones with a relatively low content of phenolic hydroxyl groups did not, which indicated that the antimicrobial effects of TA greatly depended on the content of phenolic hydroxyl groups. The applications of UV-curable antibacterial resins in coatings were also studied. The cured coatings of TA-G5 resins with the highest content of phenolic hydroxyl groups exhibited the highest antibacterial activity with 5 log reduction. The basic properties of UV-cured coatings were also fully characterized, and the results demonstrated that the novel UV-curable resins had potential applications in UV-curable antibacterial coatings.
研究领域:
高分子化学
·
材料科学
·
抗菌材料
·
涂料技术
·
生物基材料
·
光聚合
·
表面功能化
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Xiaodong Xin,Shaohua Sun,He Li,Mingquan Wang,Ruibao Jia
Bisphenol A (BPA) can disrupt endocrine system and cause cancer. It has been considered as an endocrine disruptor. It is important and necessary to develop a sensitive and rapid method for detection of BPA. In this study, graphene oxide nanoribbons (GONRs) were synthesized from the facile unzipping of multiwalled carbon nanotube (MWCNT) with the help of microwave energy. MWCNT/GONRs and chitosan (CS) were used to prepare electrochemical BPA sensor. Compared with graphene, MWCNT/GONRs have favorable adsorption capacity, electron transfer ability and electrocatalytic property, which could enhance the response signal toward BPA. CS also exhibits excellent film forming ability and improves the electrochemical behavior of MWCNT/GONRs modified electrode. The sensor displays a sensitive response to BPA within a wide concentration range (0.005–150 μg/L). The proposed electrochemical sensor shows low detection limit (1 ng/L), good reproducibility (RSD = 5.2%), selectivity, and acceptable stability. This proposed sensor was successfully employed to determine BPA in water samples with satisfactory results.
研究领域:
分析化学
·
环境毒理学
·
生物传感器
·
纳米材料
·
食品安全
·
环境监测
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongen Shi,Yanzhong Wang,Zhen Tian,Baofeng Zhang,Li Guo,Yanjun Chen
To improve the inherent conductivity and extend the cycling durability of Na 3 V 2 (PO 4 ) 3 (NVP), this study suggests a technique for synthesis of phenol-formaldehyde (PF) resin-derived lamellar intercalated spherical NVP (PF-NVP/C) structures via solvothermal method. The unique lamellar intercalated sphere structure typically possesses good mechanical toughness, enabling better tolerance to the current impact. Moreover, spherical morphology features a significantly enlarged specific area of 144.32 m 2 g -1 , facilitating full contact between electrolyte and electrode, and providing additional active sites for Na + storage. Coupled with protective effect of carbon coating layers, the cycling stability is significantly improved. Meanwhile, highly conductive graphitized carbon skeleton from the pyrolysis of PF bonding with the uniform amorphous carbon layers constructs favourable networks for electronic transportation. Notably, the modified PF-NVP/C delivers a capacity of 115.5 mAh g -1 at 0.1 C. Remarkably, it can maintain a high capacity of 71.1 mAh g -1 and keeps 50.8 mAh g -1 even after 16000 cycles at 50 C, exhibiting outstanding cycling stability. Ex-situ XRD indicates the redox reaction of V 3+ /V 4+ is highly reversible. Furthermore, by comparing morphological and electrochemical kinetic characteristics of the PF-NVP/C before and after cycling, further evidence is provided to demonstrate its unique lamellar intercalated spherical morphology and excellent structural stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机非金属材料
·
纳米结构材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）