CHEMICAL PAPERS
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2022
·Vol. 76
·期 10
·6323-6333
·
IF 2.146
Li Yan,Wu Tingxia,Song Lingyu,Zhu Yongbao,Chen Yizhe,Huang Yufu,Tang Junping,Cheng Kai,Lin Donghai,Chen Guosong
Natural graphite has a large electrical conductivity in plane direction, hundreds times of that in vertical direction. Regulating graphite flakes perpendicular to the plane will improve the performance of the sensor. As a non-connected method, magnetic field-assisted orientation can be no-additives. However, some studies believe that diamagnetic materials are non-magnetic, and must be doped by ferromagnetic materials before oriented by a magnetic field. Here, original graphite flakes were vertically oriented by a low magnetic field during the electrode preparation to increase effective surface area. The performance of electrode was enhanced in both potassium ferricyanide/potassium ferrocyanide probe system and detection of hydroquinone (HQ) and catechol (CC). For HQ and CC detection, the sensitivities of vertically oriented graphite flakes electrode are 5.05 times and 6.35 times higher than that of graphite flakes without magnetic field, respectively. This magnetic alignment technology could construct other electrode materials for electrochemical sensors.
研究领域:
材料科学
·
电化学传感器
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Keru Cao,Fangyu He,Jun Yan,Weiwei Zhu,Yanan Wang,Yuheng Zhang,Biao Zhang,Xiaohua Yu,Qingfeng Shen,Chunxia Liu,Qi Wang
Electrochemical detection techniques are not sensitive in detecting isomers with similar structures and properties due to the disadvantages of some sensors such as instability, poor selectivity and susceptibility to environmental interference. Therefore, calcined metal–organic framework structure (Bi-MOF) was used to prepare its derivative Bi@C nanocomposites, and materials with multiple surface active sites and large specific surface area were developed to improve the current response signal of the detected substance. The morphology and structure of the prepared Bi@C were tested by XRD, SEM and other characterisation means. The electrochemical response of Bi@C nanocomposites was studied using an electrochemical workstation for hydroquinone (HQ) and catechol (CC) electrochemical detection. An electrochemical method was developed for the simultaneous determination of hydroquinone and catechol in a simple and highly selective manner. Differential pulse voltammetry (DPV) was used for simultaneous detection of HQ and CC. The results show that Bi@C electrode can detect isomers with high selectivity. Bi@C was detected in the range of 2–600 μM and 2–800 μM for HQ and CC, respectively, in pH = 7 solution. The detection limits were 0.14 μM and 0.12 μM(S/N = 3), respectively. The sensor is successfully applied to detect HQ and CC of real samples and has low detection limit, good recovery, high selectivity, stability and reproducibility. It provides a new idea for electrochemical detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Weifeng Xu,Xiang Liu,Kewen Tang
A novel bi-functional β-cyclodextrin polymer (CD@TCT@PEI) was synthesized for the removal of hydroquinone and Pb(II) from wastewater. The structure and adsorption performance of CD@TCT@PEI towards hydroquinone and Pb(II) were studied comprehensively. Both of the adsorption processes fit the pseudo-second-order kinetic model well. The adsorption isotherms of hydroquinone and Pb(II) could be described well by Langmuir isotherm model, and the maximum adsorption capacities of hydroquinone and Pb(II) are 364.86 and 113.52 mg g −1 , respectively. The adsorption of hydroquinone and Pb(II) on CD@TCT@PEI is an exothermic and spontaneous process. The adsorbed CD@TCT@PEI could be regenerated easily, and can still maintain high adsorption performance after 5 cycles. The electrostatic interaction and coordination interaction account for the adsorption of Pb(II), and inclusion of cyclodextrin and hydrogen-bond interaction are responsible for hydroquinone adsorption. This study provides some insights to design an adsorbent that can simultaneously remove heavy metal ions and organic micropollutants from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xuebo Liu,Fangyuan He,Liwei Bai,Xiaowei Cao,Chang Liu,Wenbo Lu
Hydroquinone (HQ) and catechol (CC) are important chemical raw materials in the modern industry, unfortunately, which are also high toxic phenolic pollutants. So how to achieve highly sensitive and selective determination HQ and CC is the challenge we face. In the present work, we report a facile strategy to obtain nitrogen and phosphorous co-doped glucose-derived carbon coated CoP nanowires (G-CoP/N,P–C NWs), in which nitrilotriacetic acid (NTA) was as the chelating reagent, glucose was as carbon source, and the precursors were subsequently experienced carbonization and phosphorization process. G-CoP/N,P–C NWs can shorten the distance of the electron transport and expand the reaction area, showing the intriguing electronic conductivity and electrocatalytic abilities. An electrochemical phenolic sensor based on G-CoP/N,P–C NWs is fabricated. The as-prepared sensor showcases the good sensing performance for HQ and CC with comparative linearity ranges of 0.8–900 μM (HQ) and 0.6–800 μM (CC), low limits of detections (LODs) of 0.18 μM (S/N = 3) and 0.12 μM (S/N = 3) for HQ and CC, respectively. Notably, it also displays excellent practical application for the recognition of HQ and CC in the rain water, the tap water , the domestic wastewater and the lake water, which may be a promising candidate in environmental water monitoring and drinking water safety.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）