MICROCHIMICA ACTA
·
2011
·Vol. 174
·期 1
·41-46
·
IF 2.578
Wang Yinling,Peng Wei,Liu Lin,Tang Min,Gao Feng,Li Maoguo
A strategy is presented for doping graphene into layered double hydroxide films (LDHs) as a means of improving charge transport of the LDH film in a modified glassy carbon electrode. This result in an enhanced electrocatalytic current for dopamine (DA) and a good separation of the potentials of DA, uric acid and ascorbic acid. Under selected conditions, the square wave voltammetric response of the electrode to DA is linear in the concentration range from 1.0 to 199 μM even in the presence of 0.1 mM ascorbic acid, and the detection limit is 0.3 μM at a signal-to-noise ratio of 3. The method was applied to the determination of DA in pharmaceutical injections with satisfactory results.
A strategy is presented for doping graphene into layered double hydroxide films (LDHs) as a means of improving charge transport of the LDH film in a modified glassy carbon electrode. This result in an enhanced electrocatalytic current for dopamine (DA) and the square wave voltammetric response of the electrode to DA is linear in the concentration range from 1.0 to 199 μM with the detection limit of 0.3 μM. The method was applied to the determination of DA in pharmaceutical injections with satisfactory results.
研究领域:
分析化学
·
电化学
·
生物传感器
·
纳米材料
·
药物分析
·
神经化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Feng Pan,Yilin Zhang,Zhiqin Yuan,Chao Lu
Carminic acid (CA) extracted from cochineal is widely used in food additives as a natural colorant, and its potential risk to human health makes its detection important. In this work, a layered doubled hydroxide (LDH)–luminol–H2O2 system-based chemiluminescence (CL) platform has been successfully applied for CA sensing. The principle detection consists of two steps: first, LDH adsorbs CA onto the surface via electrostatic attraction; second, CA quenches the CL of the LDH–luminol–H2O2 system via the synergistic effect of CL resonance energy transfer, reduction of reactive oxygen species, and occupation of positively charged centers of brucite-like layers. With this CL approach, 0.5 μM CA is detectable using a CL spectrometer, and the limit of detection is 0.03 μM. This CL system exhibited a linear response to CA in the concentration range from 0.5 to 10 μM. In addition, the practical application of the designed CL sensing system is evaluated with dried pork slice samples.
研究领域:
分析化学
·
食品科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 44
·期 31
·16348-16358
·
IF 4.084
Dandan Sun,Dechao Chi,Zekang Yang,Zipeng Xing,Junwei Yin,Zhenzi Li,Qi Zhu,Wei Zhou
Mesoporous g-C 3 N 4 /Zn–Ti layered double hydroxide (LDH)-laminated van der Waals heterojunction nanosheets were prepared by a facile one-step in situ hydrothermal method . Due to the strong electrostatic interactions between the positively charged Zn–Ti LDH and negatively charged g-C 3 N 4 nanocrystal , a laminated van der Waals heterostructure was successfully formed between Zn–Ti LDH and g-C 3 N 4 . The mesoporous g-C 3 N 4 /Zn–Ti LDH-laminated van der Waals heterojunction, which had a narrow bandgap of 2.41 eV extended the photoresponse to the visible light region. The obtained heterojunctions showed excellent visible-light-driven photocatalytic performance for the complete removal of ceftriaxone sodium (up to ∼97%) and a high hydrogen production rate (∼161.87 μmol h −1 g −1 ). This was mainly attributed to the formation of the laminated van der Waals heterojunctions, which favoured charge separation and the absorption of visible light, and the mesoporous structure, which provided more surface active sites. This facile strategy for preparing mesoporous g-C 3 N 4 /Zn–Ti LDH-laminated van der Waals heterojunctions offers new insights for the fabrication of high-performance van der Waals heterojunction photocatalytic materials.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境化学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Xia Hua,Zhihong Gao,Qianqian Wang,Wenming Hao,Xiaoliang Yan,Ruifeng Li
The accumulation of heavy metal on catalysts during petrochemical process produces deactivated catalysts that cannot be directly disposed in nature, due to the high toxicity. The elimination of the detrimental effect of heavy metal ions can be achieved by immobilizing these ions in the form of spinel structure, yet this requires high-temperature calcination . Herein, Ni 2+ ions are stabilized and confined within the surface NiAl 2 O 4 on Al 2 O 3 through hydrothermal process and subsequent low-temperature thermal treatment. The formation of nickel aluminum layered double hydroxide (NiAl-LDH) as intermediate favors the generation of surface aluminate spinel at the temperature as low as 450 °C. The formation of surface spinel is beneficial to restricting the mobility of Ni 2+ ions. The growth and immobilization mechanisms of the surface spinel structure were proposed, which contributes to alternative and promising route for the low-temperature approach of the retention of the heavy metal ions mobility.
研究领域:
环境催化
·
材料化学
·
工业化学
·
固体化学
·
污染控制
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hua Tian,Kaixin Zhu,Wang Li,Lin Wang,Zhifeng Yu,Yuannan Lai,Yunyi He
Ni-Co layered double hydroxide (NCLDH) with nitrate anions as interlayer counter ions was obtained via an oxidation-induced anion intercalation process. The optimization on the tunable proportion between divalent and trivalent metal cations in NCLDH host layers is realized in the dependence on the regulation of the additive amount of hydrogen peroxide as an oxidizing agent. The increase of trivalent metal cations facilitates the intercalation of nitrate anions into the interlamellar region between NCLDH host layers. Importantly, the electrostatic interaction between NCLDH host layers and interlayer anions results in the formation of hierarchical flower-like morphologies towards the enhancement of specific surface areas. Moreover, the increase in number of interlayer nitrate anions expands effectively interplanar spacing between NCLDH host layers. Remarkably, this unique structure not only accelerates the diffusion process of active hydroxide anions in the bulk phase of LDH, but also strengthens the stability of the hierarchical structure during electrochemical reactions. The electrochemical evaluation shows that NCLDH-16 achieves a superior specific capacity of 802 C g −1 at a current density of 1 A g −1 with a capacity retention of 86.7% as the increase of current densities to 10 A g −1 . The NCLDH-16//AC hybrid supercapacitor delivers a maximum energy density of 37.6 Wh kg −1 at a power density of 800 W kg −1 as well as still retains 87.4% of the initial capacitance after 10 000 cycles, suggesting great potential in practical energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
电化学能量存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）