Journal of Environmental Sciences
·
2018
·
IF 3.12
Yubo Tu,Peiwei Han,Lianqi Wei,Xiaomeng Zhang,Bo Yu,Peng Qian,Shufeng Ye
Large amounts of cyanide tailings are produced during the cyanidation process in gold extraction, which are hazardous solid wastes due to the toxic cyanide. Pyrite is one of the main minerals in cyanide tailings. The removal of cyanide adsorbed on pyrite by H 2 O 2 oxidation under alkaline conditions was investigated in this study. It was found that the removal efficiency was positively correlated with pH from 5 to 12, but remained almost constant when pH was higher than 12. The highest cyanide removal efficiency of 91.10% was achieved by adding no less than 0.6 wt.% of H 2 O 2 . Cyanide removal was positively correlated with the CN − adsorption amount between 1.06 and 8.5 mg/g, and temperature between 25 and 85°C. The removal of cyanide adsorbed on pyrite by H 2 O 2 oxidation under alkaline conditions was due to the oxidation of pyrite. Hexacyanoferrate, thiocyanate and sulfate were generated with mole ratios of about 2.03:1.12:3.17 during the cyanide removal.
研究领域:
环境科学
·
矿物加工
·
废物处理
·
湿法冶金
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Yuanyuan Li,Li Tang,Dongmei Deng,Haibo He,Xiaoxia Yan,Jinhua Wang,Liqiang Luo
The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-Mn 3 O 4 microparticles wrapped by reduced graphene oxide (MnO-Mn 3 O 4 @rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-Mn 3 O 4 @rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-Mn 3 O 4 @rGO exhibited prominent catalyzing effect on the electroreduction of H 2 O 2 , due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and Mn 3 O 4 . The MnO-Mn 3 O 4 @rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM −1 cm −2 . The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting H 2 O 2 in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Analytical Science and Technology
·
2021
·Vol. 12
·期 1
·1-9
·
IF 2.769
Dong Bin,Fan Qian,Li Ming,Huan Yanfu,Feng Guodong,Shan Hongyan,Fei Qiang
In this study, N-(4-aminobutyl)-N-ethylisoluminol (ABEI) was used as an energy donor, while sodium fluorescein was used as an enhancer and energy acceptor, which resulted in it producing resonance energy transfer and greatly increasing the strength of chemiluminiscence (CL). When horseradish peroxidase (HRP) is added, hydrogen peroxide (H2O2) will quickly separate into hydroxyl radicals (·OH) and superoxide ions (O2·−). If tyrosine (Tyr) is present in the system, the hydroxyl group on the benzene ring of Tyr robs ·OH and O2·− in the CL system, thereby reducing the intensity of CL. Based on this phenomenon, a luminescence system of ABEI and sodium fluorescein system was established to detect Tyr for the first time. This method has an ultra-low detection limit and a wide linear range, and is cheap and easy to operate. Under various optimal conditions, the linear range is from 3.0×10−8 to 3.0×10−5 mol/L, and the limit of detection is 2.4×10−8 mol/L. It has been successfully used in the detection of dairy products with satisfactory results.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Zhao-Liang Wang,Yu-Han Shen,Xin Sun,Ze-Hao Li,Xin-Yu Wang,Zheng Zhao
Hydrogen peroxide (H 2 O 2 ) quantification in biomedicine is an important indicator for different biological tissues. In this study, we developed a visual detection for H 2 O 2 sensing based on gold nanozyme-silk fibroin (AuNCs-SF) hydrogel hybrid system with good compatibility between silk fibroin hydrogel and BSA-AuNCs. The AuNCs-SF hydrogel exhibited a fast response to H 2 O 2 directly by fluorescence change and showed high sensitivity (limit of detection of 0.072 mM) and well stability. Moreover, the hydrogel possessed high selectivity for H 2 O 2 in FBS solution and excellent biocompatibility to L929 cells (mouse fibroblasts). Therefore, the AuNCs-SF hydrogel hybrid system has a great potential in the fields of clinical diagnosis for visual detection of H 2 O 2 .
研究领域:
生物医学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuwei Pan,Minghua Zhou,Jingju Cai,Yusi Tian,Ying Zhang
Sulfamethazine (SMT) is extensively used as growth promoters and antibacterial drugs. In this study, premagnetized Fe 0 was used to catalyze H 2 O 2 decomposition (pre-Fe 0 /H 2 O 2 ) in the presence of nitrilotriacetic acid (NTA) to remove SMT at neutral pH conditions. In all, 30.3% and 99.8% of SMT were removed by the pre-Fe 0 /H 2 O 2 process (60 min) and the pre-Fe 0 -NTA/H 2 O 2 process (30 min), respectively. The removal rate of SMT in the pre-Fe 0 -NTA/H 2 O 2 process was 2.5 times larger than that in the Fe 0 -NTA/H 2 O 2 process. Electron paramagnetic resonance signals indicated that more radicals were generated in the pre-Fe 0 -NTA/H 2 O 2 system. SMT and NTA and their degradation by-products adsorbed on pre-Fe 0 reduced the contact angle of the particle and prevented the formation of Fe 3 O 4 on the particle surface, thus accelerating Fe 0 corrosion. Tafel scan images confirmed the enhancement of Fe 0 corrosion in the presence of NTA and magnetic field. The Fe 0 corrosion rate (10 9 ) after 20 min of reaction was 6.61 cm/s in pre-Fe 0 -NTA/H 2 O 2 , much higher than that in Fe 0 /H 2 O 2 (0.73 cm/s), pre-Fe 0 /H 2 O 2 (1.47 cm/s) and Fe 0 -NTA/H 2 O 2 (2.94 cm/s). Pre-Fe 0 -NTA/H 2 O 2 could also keep the fast SMT removal with eight consecutive runs without the addition of pre-Fe 0 and NTA and presented high efficiency for SMT removal in real municipal wastewater .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2020
·Vol. 32
·期 6
·1243-1250
·
IF 2.544
Juan Li,Chun Tang,Taotao Liang,Chuyue Tang,Xiaohui Lv,Kanglai Tang,Chang Ming Li
There are great challenges to fabricate a highly selective and sensitive enzyme-free biomimetic sensor. Herein for the first time a unique nanostructure of porous molybdenum carbide impregnated in N-doped carbon (p-Mo 2 C/NC) is synthesized by using SiO 2 nanocrystals-templating method and is further used as an enzyme-free electrochemical biosensor toward highly selective, sensitive detection of H 2 O 2 , of which the limit of detection, dynamic detection range and sensitivity accomplish as 0.22 μM, 0.05–4.5 mM and 577.14 μA mM −1 cm −2 , respectively, and are much superior to the non-porous molybdenum carbide impregnated in N-doped carbon (Mo 2 C/NC). The sensor is also used to monitor H 2 O 2 released from A549 living cells. This work holds a great promise to be used to monitor the presence of H 2 O 2 in biological research while offering an important knowledge to design a highly selective and sensitive biomimetic sensor by synthesizing a porous catalyst to greatly improve the reaction surface area rather than conventionally only relying on dispersing the catalyst material into porous carbon substrate.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Jingzhen Zhang,Longhui Zheng,Fu Wang,Chao Chen,Haodong Wu,Sajjad Ahmed Khan Leghari,Mingce Long
Isopropanol is frequently employed as the electron donor to facilitate hole transfer and promote photocatalytic H 2 O 2 production. However, the role of alcohols can be more complicated due to the interaction with TiO 2 . According to a comparison of aliphatic, aromatic and aromatic heterocyclic alcohols on photocatalytic H 2 O 2 production on TiO 2 , furfural alcohol (FFA) displays superior capability to others. The presence of alcohols with aromatic structures can significantly accelerate formation and suppress decomposition of H 2 O 2 . Moreover, furfural alcohol tends to form more stable complexes on TiO 2 surface, which can negatively shift the flat band position, induce visible light activity, and boost two-electron reduction of oxygen. The altered electron transfer pathway for H 2 O 2 production was indicated by the Koutecky-Levich plots, the less pH dependence, and the signals of peroxide species in Raman spectra. This study brings insights for modulating the interfacial oxygen reduction and designing highly efficient and selective H 2 O 2 production photocatalytic systems.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 12
·H816
·
IF 2.859
Shiyong Bao,Mingliang Du,Ming Zhang,Han Zhu,Pan Wang,Tingting Yang,Meiling Zou
Herein, a facile route to fabrication of carbon nanofibers/polyaniline/Au nanofibers (CPANFs) with tunable densities of gold nanoparticles (AuNPs) was proposed, and the potential application of the CPANFs as efficient electrochemical detector of H2O2 was demonstrated. First, carbon nanofibers (CNFs) were successfully obtained through the carbonization procedure using electrospun polyacrylonitrile (PAN) nanofibers as a precursor. Then, polyaniline (PANI) nanorods were coated on the CNFs by an in situ polymerization of aniline, in which AuNPs were homogenously distributed via gold-thiol binding interactions. Finally, an aqueous nafion solution was used to attach HRP-modified CPANFs to the pretreated glassy carbon electrode (GCE) for H2O2 detection. The fabricated electrochemical detectors for H2O2 exhibited a high sensitivity for detection of H2O2 with a detection limit of 0.18 μM at signal-to-noise ratio of 3.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Na Zhang,Wei Ma,Pin-Gang He,Yi-Tao Long
Here, polydopamine derivative monolayer was generated by electro-polymerization of thiol dopamine derivatives modified on gold electrode, and the adhesion of polydopamine made it being a platform for secondary reaction. The influence of pH on formation of polydopamine derivative was investigated. Horseradish peroxidase (HRP) was adhered on the polydopamine derivative monolayer electrode catalyzing the oxidation of H 2 O 2 . Cyclic voltammetry (CV) was used to detect the polydopamine monolayer as well as electrochemical catalysis of H 2 O 2 . Besides, electrochemical impedance spectroscopy (EIS) and atomic force microscope (AFM) were also employed to characterize the polymeric monolayer.
研究领域:
生物化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 30
·19246-19252
·
IF 4.036
Qiaoli Zhang,Yang Yang,Junmei Xia,Yingying Zhang,Shilei Liu,Zhiqin Yuan
It has been a challenge to achieve rapid, simple, and effective discrimination of organophosphorus nerve agents (typical chemical warfare agents) due to the similar chemical properties of the targets such as sarin, soman, cyclosarin and VX. In this study, we propose a chemiluminescence sensor array that can effectively discriminate organophosphorus nerve agents by organophosphorus-H2O2 reaction, which produces peroxyphosphonate intermediate and regulates the chemiluminescence intensity. A simple chemiluminescence sensor array based on different chemiluminescence characteristics of the four organophosphorus nerve agents in the luminol–H2O2 system and layered double hydroxide–luminol–H2O2 system has been constructed. Four agents can be well distinguished at a concentration of 1.0 mg L−1 when linear discriminant analyses and hierarchical cluster analyses are smartly combined. The high accuracy (100%) evaluation of 20 blind samples demonstrates the practicability of this proposed chemiluminescence sensor array.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2022
·Vol. 14
·期 9
·1412
·
IF 3.53
Yixin Lu,Chenghan Tang,Yujie Liu,Jiao Chen
In phosphate buffer, the degradation of ATZ by ozone/(O3/H2O2) under various circumstance was explored and the degradation mechanism and dynamics were probed. The findings revealed that when maintaining the reaction temperature at 25 °C, the H2O2concentration and the O3concentration were 20 mol/L and 20 mol/L, respectively. Moreover, the degradation rate of 5 mol/L ATZ under the influence of O3/H2O2was 92.59% in phosphate buffer at pH7. The mechanism analysis showed that HO• and O3underwent co-oxidized degradation and that the HO• and O3oxidation degradation ratios were close to 1:1 under acidic conditions. Furthermore, HO• oxidative degradation dominated the ATZ degradation process. The kinetics analysis showed that the ATZ kinetics of O3/H2O2degradation were more compatible with quasi-second-order reaction kinetics under different temperatures, pH values, and H2O2concentrations.Keywords:ozone;hydrogen peroxide;atrazine;degradation mechanism;kinetics
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 8
·592
·
IF 5.743
Tong Li,Qi Wang,Zhou Wang
Facet and defect engineering have achieved great success in improving the catalytic performance of CeO2, but the inconsistent reports on the synergistic effect of facet and oxygen vacancy and the lack of investigation on the heavily doped oxygen vacancy keeps it an attractive subject. Inspired by this, CeO2nanocrystals with selectively exposed crystalline facets (octahedron, cube, sphere, rod) and abundant oxygen vacancies have been synthesized to investigate the synergistic effect of facet and heavily doped oxygen vacancy. The contrasting electrochemical behavior displayed by diverse reduced CeO2nanocrystals verifies that oxygen vacancy acts distinctly on different facets. The thermodynamically most stable CeO2octahedron enclosed by heavily doped (111) facets surprisingly exhibited the optimum non-enzymatic H2O2sensing performance, with a high sensitivity (128.83 µA mM−1cm−2), a broad linear range (20 µM~13.61 mM), and a low detection limit (1.63 µM). Meanwhile, the sensor presented satisfying selectivity, repeatability, stability, as well as its feasibility in medical disinfectants. Furthermore, the synergistic effect of facet and oxygen vacancy was clarified by the inclined distribution states of oxygen vacancy and the electronic transmission property. This work enlightens prospective research on the synergistic effect of alternative crystal surface engineering strategies.Keywords:electrochemical H2O2sensing;oxygen vacancy;facet;cerium dioxide
研究领域:
材料科学
·
电化学
✓ 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）