JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yuanfeng Wei,Xingwen Yu,Chengbin Liu,Jianhong Ma,Shudan Wei,Tao Chen,Kai Yin,Hui Liu,Shenglian Luo
Although Fe-chitosan adsorbents are attractive for removing arsenite from water, the practical applications of these granular adsorbents are mainly limited by slow adsorption kinetics. In this study, radially porous Fe-chitosan beads (P/Fe-CB) were prepared using freeze-casting technique. The P/Fe-CB particles possess radially aligned micron-sized tunnels from the surface to the inside as well as excellent acid resistance. Kinetic studies show that the adsorption equilibrium time of P/Fe-CB to 0.975 mg/L As(III) (within 240 min) is considerably shorter than that of compact Fe-chitosan beads (over 600 min). The maximal adsorption capacity of P/Fe-CB for As(III) is 52.7 mg/g. It can work effectively in a wide pH range from 3 to 9, and the coexisting sulfate, carbonate, silicate and humic acid have no significant effect on As(III) removal. The addition of H 2 O 2 can further accelerate and promote the As(III) removal except at high pH (11) and phosphate concentration (50 mg/L). The fixed-bed experiments demonstrate that the P/Fe-CB column can effectively treat about 3000 bed volume (BV) of simulated As(III)-containing groundwater to meet the drinking water standard (<10 μg As/L). This study would extend the potential applicability of porous Fe based chitosan adsorbent and millimeter-sized adsorbent combined with H 2 O 2 to a great extent.
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
CHEMOSPHERE
·
2021
·
IF 7.086
Yanping Zhu,Qingru Xie,Runliang Zhu,Ying Lv,Yunfei Xi,Jianxi Zhu,Jian Fan
As the heterogeneous Fenton reactions are always restricted by the unsatisfied reduction efficiency of Fe(III) and ineffective consumption of H 2 O 2 , many strategies have been developed. In this work, we prepared hydrothermal carbons (HTC) with different graphitization degrees using glucose under different hydrothermal times, and then they were combined with ferrihydrite (Fh). Interestingly, although 30%HTC/Fh has much better BPA degradation efficiency than Fh (26 times larger of calculated degradation rate constants), the decomposition rate of H 2 O 2 in the former system is lower. The generated Fe(II) of HTC/Fh is much higher than that of Fh during the heterogeneous Fenton reactions , and the degradation of BPA is almost unaffected by p -benzoquinone (scavenger of superoxide radicals (O 2 •− )) while greatly inhibited by isopropanol (scavenger of hydroxyl radicals (HO • )). These results indicate that HTC act as electron donors due to the abundant carbon-centered persistent free radicals (PFRs) to directly reduce Fe(III) to Fe(II) and therefore decrease the H 2 O 2 consumption by Fe(III), which subsequently inhibits the generation of less active O 2 •− and promote the utilization efficiency of H 2 O 2 . HTC with a low graphitization degree contain more PFRs for Fe(III) reducing, significantly enhancing the Fenton catalytic activity of Fh.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 6
·974-979
·
IF 1.9
Jian Xin Xie,Wen Jing Chen,Xian Xue Wu,Yun Ying Wu,Hong Lin
It was found that Co–Fe layered double hydroxides (Co–Fe LDHs), other than intercalated LDHs, could catalyze the luminol–H2O2 chemiluminescence (CL) reaction and generate a strong CL signal. The as-prepared Co–Fe LDHs were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on the CL spectra, UV-visible absorption spectra and free radical scavenging assay, a possible CL mechanism was proposed. Under optimum conditions, a good linear relationship between the CL intensity and H2O2 concentration in the range of 1.0 × 10−8 to 3.0 × 10−6 mol L−1, with the limit of detection of 5.0 × 10−9 mol L−1, was obtained. Based on the glucose conversion into H2O2 by glucose oxidase, the sensitive detection of glucose could be realized with the limit of detection of 2.0 × 10−8 mol L−1. This proposed method has been applied to the determination of H2O2 and glucose in real samples with satisfactory results.
研究领域:
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 NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 11
·1-9
·
IF 2.132
Gao Wenshan,Zhang Yuangong,Zheng Ying,Zhang Hailei,Wang Xiaoke,Bai Libin,Wu Yonggang,Ba Xinwu
The 19 F nuclear magnetic resonance (NMR) has been widely employed as a detection tool in biological studies due to its low biological background, noninvasiveness, high sensitivity, and real-time monitoring capability. Herein, we report a one-pot synthesis of halloysite nanotubes (HNTs) treated with benzeneboronic acids (6FBB) to afford the HNT-based 19 F NMR probe which is capable to detect the H 2 O 2 in low concentration. The product was well characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The intensity of signals of 19 F was enhanced with the increasing concentration of fluorine, and the signals apparently shifted from − 62.68 to − 62.85 ppm upon the addition of H 2 O 2 . The obtained 19 F NMR probes also displayed a long spin-spin (T2) relaxation time (91.27 ms), which can strengthen image intensity. Moreover, the 19 F NMR probe exhibited non-toxic against HeLa cell. The 19 F NMR probe may serve as a desirable candidate to predict the change of H 2 O 2 in vivo.
研究领域:
生物化学
·
医学影像学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Hailong Tian,Mengzhu Zhang,Guoxia Jin,Yue Jiang,Yuxia Luan
Chemodynamic therapy (CDT) utilizes Fenton catalysts to convert intracellular hydrogen peroxide (H 2 O 2 ) into cytotoxic hydroxyl radical (OH∙) for tumor therapy, but endogenous H 2 O 2 is usually insufficient to achieve satisfactory tumor therapy effect. Engineering an efficient CDT nanoplatform for satisfactory cancer therapy remains a challenge. Herein, we rationally designed a Cu-based metal-organic framework-199 (MOF-199) nanoplatform integrating vitamin k3 (Vk3) for amplified CDT-mediated cancer therapy, which could accumulate efficiently in tumor tissues through enhanced permeability and retention (EPR) effect. The MOF-199 nanoparticles (MOF-199 NPs) were dissociated by glutathione (GSH) into MOF-199 fragments, which triggered Fenton-like reaction for CDT. On the one hand, Vk3 was catalyzed by NAD(P)H quinone oxidoreductase-1 (NQO1) to produce sufficient H 2 O 2 to activate Fenton-like reaction. On the other hand, GSH was largely consumed in the tumor microenvironment. Thus, this nanoplatform enabled sufficient cytotoxic reactive oxygen species (ROS) for amplified CDT effect, demonstrating effective tumor growth inhibition with minimal side-effect in vivo. Our work provides an innovative strategy to modulate GSH and H 2 O 2 levels for amplified CDT.
研究领域:
癌症治疗
·
纳米技术
·
生物化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED GEOCHEMISTRY
·
2021
·
IF 3.524
Fuwei Sun,Tianhu Chen,Xuehua Zou,Haibo Liu,Ziyang Chu,Daobing Shu,Hanlin Wang,Fangju Huang,Dong Chen
Siderite is a conventional mineral of sedimentary rock and can activate H 2 O 2 to produce hydroxyl radicals (·OH). Bisphenol A (BPA), 2,4-dichlorophenoxyacetic acid (2,4-D), and sodium sulfadiazine are selected as typical micropollutants to be degraded in a siderite-activated H 2 O 2 system. To determine the influence of solution chemistry on siderite-activated Fenton-like reactions, the amount of ·OH was quantified by using benzoic acid as a probe molecule, and then, kinetic fitting was used to analyze the reaction rate. The results showed that in the range of pH values from 3 to 9, the dissolved Fe 2+ and the lattice Fe(Ⅱ) of siderite activate H 2 O 2 to generate ·OH. An increase in siderite dosage and H 2 O 2 concentration favored the generation of ·OH, but higher siderite dosage and H 2 O 2 concentration suppressed the production rate. The inhibition order of anions on the generation of ·OH was confirmed as follows C l − > N O 3 − > S O 4 2 − . Little difference was observed in the presence of Ca 2+ and Mg 2+ , while the presence of Mn 2+ significantly promoted the production of ·OH. The suppression of humic acid (HA) became more serious as the HA concentration increased. Cycling experiments proved that the system could still produce ·OH in four cycles, although the production rate experienced a slight decrease. The experimental results suggested the role of siderite in the degradation of organic pollution in the process of in-situ soil and groundwater remediation.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Feige Wang,Wenjing Wang,Shoujun Yuan,Wei Wang,Zhen-Hu Hu
Thiamphenicol (TAP) has been widely used in aquaculture to prevent bacterial diseases. However, this drug exhibits toxic side effects on the haemopoietic system. The removal of residual TAP in wastewater in advanced oxidation processes (AOPs) was rarely reported before. In this study, degradation of TAP in aqueous solution by UV alone, UV/H 2 O 2 and UV/PS processes was investigated. The results showed that UV/H 2 O 2 and UV/PS significantly enhanced the degradation compared to UV alone. The TAP degradation followed a pseudo-first-order kinetics pattern well. The k obs declined with the increase of the initial TAP concentration, and increased with increasing oxidant dosage. The TAP degradation with UV/H 2 O 2 process was favorable under neutral and acidic conditions, and with UV/PS process was favorable under acidic and alkaline conditions. HCO 3 − markedly inhibited the degradation with the both processes, NO 3 − had a slight inhibition on the degradation in UV/H 2 O 2 system, and Cl − significantly enhanced the degradation with UV/PS process. HA markedly inhibited the degradation with the both processes. SO 4 − played the main role in the TAP degradation by UV/PS process. When TAP was completely degraded, only part of TAP was mineralized with UV/H 2 O 2 process, and was totally mineralized with UV/PS process. The possible degradation pathways were proposed based on the intermediate products obtained by LC-TOF-MS analysis. The electrical energy per order (EE/O) analysis showed that UV/PS process was a less energy consumption process. The results from this study revealed that UV/PS process was a cost-effective process in the degradation of TAP.
研究领域:
环境科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Guang Yang,Peng He,Xin-Ping Qu
The inhibitory effect of glycine on corrosion and chemical mechanical polishing (CMP) of Mo in hydrogen peroxide (H 2 O 2 ) based abrasive-free alkaline slurry has been investigated. Results show that, in H 2 O 2 based slurry, both static etching rate (SER) and removal rate (RR) of Mo during chemical mechanical polishing were reduced by adding glycine and the inhibition efficiency was around 50%. From ex-situ and in-situ open circuit potential (OCP), current density transient and potentiodynamic polarization measurements, it is found that formation of oxides was delayed due to blocked contact between oxidizer and the sample surface by electrostatic adsorption of glycine zwitterion on the surface. Glycine can form complex with MoO 3 and promote dissolution of surface oxide, MoO 3 , resulting in a reduced passivation layer. The slowed oxidation reaction dominates the whole process, resulting inhibited Mo corrosion and leading to a smoother Mo surface.
研究领域:
材料科学
·
腐蚀工程
·
表面化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2014
·
IF 5.825
Jie Zhou,Chuanan Liao,Limin Zhang,Qigang Wang,Yang Tian
In this work, small molecular hydrogel was first employed as a surrounding matrix to stabilize an enzyme model, Cytochrome c (Cyt c), and more importantly to facilitate electron transfer between redox enzyme and electrode. Direct electron transfer of Cyt c was successfully achieved in the molecular hydrogel with redox formal potential (E0′) of 100.7 ± 3.2 mV versus Ag|AgCl and heterogeneous electron transfer rate constant (ks) up to 18.6 ± 2.3 s–1. Experimental data demonstrated that Cyt c was stably immobilized into the molecular hydrogel and retained its inherent bioactive activity toward H2O2. The direct redox reaction of Cyt c, followed by the biochemical reaction between Cyt c and H2O2, established a reliable approach to determine H2O2 at an optimized potential with high selectivity over other reactive oxygen species (ROS), oxygen, metal ions, ascobic acid (AA), and so on. In addition, the present biosensor for H2O2 also exhibited wide linear range and low detection limit, which fulfills the requirements for detection of H2O2 in a biological system. The remarkable analytical performance of the present biosensor, as well as the long-term stability and good reproducibility ascribed to the molecular hydrogel-stabilized enzyme, provided a durable platform for real-time determination of H2O2 from live cells.
研究领域:
生物化学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jin-Wen Liu,Ying Luo,Yu-Min Wang,Lu-Ying Duan,Jian-Hui Jiang,Ru-Qin Yu
Graphitic carbon nitride (g-C3N4) nanosheets, an emerging graphene-like carbon-based nanomaterial with high fluorescence and large specific surface areas, hold great potential for biosensor applications. Current g-C3N4 nanosheets based fluorescent biosensors majorly rely on single fluorescent intensity reading through fluorescence quenching interactions between the nanosheets and metal ions. Here we report for the first time the development of a novel g-C3N4 nanosheets-based ratiometric fluorescence sensing strategy for highly sensitive detection of H2O2 and glucose. With o-phenylenediamine (OPD) oxidized by H2O2 in the presence of horseradish peroxidase (HRP), the oxidization product can assemble on the g-C3N4 nanosheets through hydrogen bonding and π–π stacking, which effectively quenches the fluorescence of g-C3N4 while delivering a new emission peak. The ratiometric signal variations enable robust and sensitive detection of H2O2. On the basis of the glucose converting into H2O2 through the catalysis of glucose oxidase, the g-C3N4-based ratiometric fluorescence sensing platform is also exploited for glucose assay. The developed strategy is demonstrated to give a detection limit of 50 nM for H2O2 and 0.4 μM for glucose, at the same time, it has been successfully used for glucose levels detection in human serum. This strategy may provide a cost-efficient, robust, and high-throughput platform for detecting various species involving H2O2-generation reactions for biomedical applications.
研究领域:
生物化学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2018
·
IF 1.712
Yaling Luo,Changjun Liu,Hairong Yue,Siyang Tang,Yingming Zhu,Bin Liang
The selective oxidation of cyclopentene by aqueous H 2 O 2 using H 3 PW 12 O 40 and tetrabutyl ammonium bromide (TBAB) as a phase transfer catalyst has been investigated. The results show that the presence of TBAB significantly improved the oxidation selectivity of cyclopentene. The effects of the reaction conditions on the conversion of cyclopentene were investigated in detail. The optimal reaction conditions are as follows: the H 3 PW 12 O 40 to TBAB molar ratio, 1:1–1:3; H 3 PW 12 O 40 to cyclopentene molar ratio, 0.54:100–0.64:100; and molar ratio of H 2 O 2 to cyclopentene, 1.6:1. The conversion reached to 59.8% in 4 h at 35.0 °C, while the selectivity of glutaraldehyde was 38.0% and the selectivity of 1,2-cyclopentanediol was 55.6%. In addition, a route for oxidation of cyclopentene by aqueous H 2 O 2 using a heteropoly acid and quaternary ammonium salt as a phase transfer catalyst was proposed.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 17
·2288-2293
·
IF 3.474
Jinpeng Lv,Yuan Liu
Clarifying the origin of green photoluminescence and the room temperature ferromagnetism in ZnO is crucial for its potential application. In this work, we show that the characteristic 368 nm donor-bound exciton and the g = 1.96 electron spin resonance (ESR) signal in ZnO nanocrystals were eliminated after H2O2 oxidation, along with the appearance of 550 nm photoluminescence, unambiguously evidencing the creation of acceptor defects. Meanwhile, the d0 ferromagnetism was significantly enhanced. In combination with the fact that ambient O2 exposure also resulted in a significant boost of ferromagnetism in ZnO particles with different grain sizes, we surmise that adsorbed oxygen facilitates the d0 ferromagnetism in ZnO while VZn causes the 550 nm green emission. This work illustrates that oxygen exposure is an efficient way to tune the physics in metal oxides through engineering defects.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）