JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Jizhou Zhang,Xianfa Ma,Lei Yuan,Dongxing Zhou
Cd 2+ pollution in aquatic environments can pose a serious threat to human health. Biochar can remove Cd 2+ from aquatic environments, but the Cd 2+ adsorption capacity of conventional biochar is low, therefore, we focused on exploring the Cd 2+ adsorption capacity of modified biochar. In this study, KMnO 4 was used to modify vermicompost biochar (VBC), and static adsorption tests for Cd 2+ were carried out. The biochar properties and its adsorption efficiency toward Cd 2+ before and after modification were studied by kinetics and isotherm model fitting, scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). Additionally, an adsorption mechanism was discussed. The results showed that the KMnO 4 -modification resulted in a successful loading of the vermicompost biochar with MnO 2 , which greatly improved its adsorption capacity for Cd 2+ . The adsorption of Cd 2+ by VBC and MVBC was a spontaneous, endothermic, and monolayer chemical adsorption process . Mineral precipitation mechanism accounted for the largest proportion, and CdCO 3 was the main precipitate. After modification the proportion of surface precipitation and other mechanisms (π-electron coordination and the inner/outer sphere surface coordination) increased，while adsorption via cation exchange, oxygen-containing functional groups, physical adsorption and electrostatic attraction reduced. Hence, KMnO 4 modification has a significant effect on the Cd 2+ adsorption behavior of vermicompost biochar.
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
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Yuxing Tong,Qunshan Yan,Song Gao,Bin Xiong,Xiangbing Tang,Zhichang Liu,Pengfei Li,Ming Huang,Ziwei Wang,Xi Le,Wei Pei,Zejun Dai,Zhe Xiong,Yi Wang
In this study, KMnO4 modification was proved to effectively increase the Ni2+ adsorption capacity of biomass. In order to clarify the KMnO4 modification mechanism, the Ni2+ adsorption characteristics of KMnO4 modified corncob (PPCB) under adsorption time, pH and Ni2+ concentration were studied. The results showed that the adsorption was the pseudo second-order kinetic process, indicating that chemisorption was the dominated process, which followed the Langmuir isotherm model and the highest Ni2+ adsorption capacity of PPCB reached 35.6 mg/g. By KMnO4 modification, the corncob was oxidized to generate carboxylates, and the MnO2 (reduction product) was loaded on the modified corncob, both carboxylates and MnO2 increased the Ni2+ adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni2+ removal efficiency of KMnO4 modified biomass decreased linearly with the increase of lignin content in biomass, while KMnO4 modified lignin showed a good adsorption performance, indicating that the cross-linked structures between lignin and other components in the biomass could inhibit the adsorption capacity of PPCB.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Yuqian Yang,Jihuai Wu,Xuping Liu,Qiyao Guo,Xiaobing Wang,Lin Liu,Yong Ding,Songyuan Dai,Jeng-Yu Lin
Hole-transport layer (HTL) plays a crucial role in the photovoltaic performance of perovskite solar cells (PSCs). In order to improve the function property of HTLs, we first use potassium permanganate (KMnO4) as a dopant for the oxidization of 2,2′,7,7′-tetrakis(N,N-p-dimethoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD). The reaction between KMnO4 and spiro-OMeTAD produces the oxidized-state spiro-OMeTAD, which enhances the conductivity and adjusts the energy level of HTL. The dual functions of KMnO4 dopant bring high photovoltaic performance of the devices. The planar PSC based on photoactive layer of mixed-cation–anion perovskite and hole-transport layer of spiro-OMeTAD doped with 1.0 mol % KMnO4 achieves a power conversion efficiency of 20.03%. Meanwhile, the hysteresis effect of the device is greatly suppressed. The simple and low-cost processing and significant performance improvement render this method promising.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Yao Fan,Siying Che,Lei Zhang,Chunsong Zhou,Haiyan Fu,Yuanbin She
A novel dual-channel sensor array based on the “off” and “off–on” phenomenon of ZnCdSe quantum dots (QDs) - KMnO 4 system was established for the effective distinguish of 30 green teas with various species, grades and origins. Starting from optimization of QDs for the construction of the sensing system, their sensitivity and selectivity performances towards 10 representative green teas were tested first and the sensor systems based on ZnCdSe QDs were finally established. An obvious “off” response brought by the interactions between amino acids , quercetin, et al. and ZnCdSe QDs was obtained while an “off–on” phenomenon brought by the interactions between catechins and the ZnCdSe-KMnO 4 system had also been verified. Furthermore, based on the differential fluorescence “off–on” response of seven catechins, the qualitative and quantitative analyses of these catechins were successfully carried out with the linear range from 0.5 to 10 µg/mL. Most importantly, through adopting the dual-channel sensor, 30 green teas with different species, origins and grades can be accurately identified with the LDA model according to the spectral signals and the recognition accuracy could achieve 100 %.
研究领域:
分析化学
·
食品科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Zhiliang Cui,Guoren Xu,Banu Ormeci,Jiayin Hao
This study synthesized novel magnetic biochar (PCMN600) by KMnO 4 –NaOH combined modification using iron-containing pharmaceutical sludge to remove toxic metals from wastewater effectively. Various characterization experiments of engineered biochar showed that the modification process introduced ultrafine MnO x particles on the carbon surface and resulted in higher BET surface area and porosity along with more oxygen-containing surface functional groups. Batch adsorption studies indicated that the maximum adsorption capacities of PCMN600 for Pb 2+ , Cu 2+ and Cd 2+ were 181.82 mg/g, 30.03 mg/g and 27.47 mg/g, respectively, at a temperature of 25 °C and pH of 5.0, which were much higher than that of pristine biochar (26.46 mg/g, 6.56 mg/g and 6.40 mg/g). The adsorption datums of three toxic metal ions fitted well to the pseudo-second-order model and Langmuir isotherm, and the sorption mechanisms were identified as electrostatic attraction, ion exchange, surface complexation, cation-π interaction and precipitation. The strong magnetic properties of the engineered biochar endowed the adsorbent with remarkable reusability, and after five cycles of recycling, PCMN600 still retained nearly 80% of its initial adsorption capacities.
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
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Yanwen Guo,Zhenzhen Cai,Fei Yan,Da Lei,Yanan Guo,Shuhai Zhang,Xincun Dou
The precise regulation of the electron-withdrawing/electron-donating strength in a probe is of great significance for the design of reaction-based fluorescent probes with specific functionalities. Here, a family of excited-state intramolecular proton transfer (ESIPT)-based probes with fluorescence turn-on sensing properties toward KMnO4 was designed by precisely modulating the electron-withdrawing strength of the substituents located at the para-position of the recognition group. It is found that −F, −CHO, and −H as the electron-withdrawing groups bound at the probe can specifically recognize KMnO4, which ensures a blue emission displayed by the reaction products. Especially with −CHO as the electron-withdrawing group, the reaction product shows the most stable fluorescence. The probe 2-(benzo[d]oxazol-2-yl)-4-formylphenyl acrylate (BOPA-CHO) demonstrated a more superior sensing performance toward KMnO4, including a low limit of detection (LOD, 0.96 nM), a rapid response (<3 s), and a rather good selectivity even in the presence of 21 interferents. Moreover, the practicality of the probe was further verified by a test pen comprising a BOPA-CHO-embedded sponge, which is capable of detecting KMnO4 solid with a naked-eye LOD of 11.62 ng. The present probe design and modulation strategy would open up a new path for the design of high-performance fluorescent probes.
研究领域:
分析化学
·
荧光传感
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2023
·Vol. 96
·期 3
·190-197
·
IF 4
Zhang Guoyan,Bai Qiuhong,Wang Xiaoyan,Li Cong,Uyama Hiroshi,Shen Yehua
The reasonable regulation of porous structure and crystallinity has been focused on supercapacitor development. Here, hierarchical porous carbons have been prepared by a hybrid of chemical activation and template methods using walnut shells as carbon source, and KMnO4 as activator and template agent. The activation mechanism of KMnO4 at different activation temperatures has been studied based on the XRD and TG analysis. Due to the synergy of rich oxygen-containing functional groups and hierarchical porous structure, the hierarchical porous carbon materials show a high capacitance of 380 F g−1 at 0.5 A g−1, good cycling stability with 93% capacitance retention even after 10000 continuous charge-discharge cycles at 5 A g−1. Additionally, the assembled symmetric supercapacitor has a high energy density of 8.95 Wh kg−1. This study shows that KMnO4 activation is a mild and highly efficient way to prepare high performance carbon electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Liao,Ling Ding,Yong Zhang,Wenkun Zhu
In this work, three kinds of biochars (PMBC-H 2 O, PMBC-PP and PMBC-HP) with excellent adsorption performance were obtained by carbonizing pig manure pre-treated with different agents. These biochars had the ordered mesoporous structures and possessed abundant active functional groups on their surface. The adsorption behaviors of the biochars towards U VI under various conditions were evaluated by batch experiment. The results showed that KMnO 4 and H 2 O 2 could enormously improve the adsorption performance of PMBC to U VI . After KMnO 4 and H 2 O 2 pretreatment , the maximum adsorption capacities of PMBC-PP (979.3 mg/g) and PMBC-HP (661.7 mg/g) were about 2.6 and 1.8 times higher than that of PMBC-H 2 O (369.9 mg/g), respectively, which was much higher than previously reported biochar-based materials. Obviously, KMnO 4 pretreatment leaded to a higher enhancement than that of H 2 O 2 . The removal mechanism of U VI on PMBC-PP was discussed in-depth. The interaction between U VI species and PMBC-PP was mainly ascribed to the abundant active sites on the surface of PMBC-PP. In a word, conversion of pig manure pre-treated with KMnO 4 into biochar not only demonstrates that PMBC-PP has great potential in the treatment of actual uranium-containing wastewater, but also provides a method for the rational utilization of pig manure to reduce the pollution.
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
Environmental Progress & Sustainable Energy
·
2012
·Vol. 32
·期 3
·564-568
·
IF 1.649
Wei-guo Pan,Rui-tang Guo,Xiao-bo Zhang,Jian-xing Ren,Qiang Jin,Hong-jian Xu
The absorption process of NO into KMnO 4 /(NH 4 ) 2 CO 3 solutions was studied in a stirred tank reactor. The experimental results showed that the reaction process was a fast pseudo-m reaction. The reaction between NO and aqueous solutions of KMnO 4 /(NH 4 ) 2 CO 3 was found to be first-order with respect to NO and with respect to KMnO 4 . The frequency factor and the average activation energy of this reaction were 2.3 × 10 9 m 3 /(mol s) and 36.77 kJ/mol, respectively. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 564–568, 2013
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
Materials Research Express
·
2019
·Vol. 6
·期 7
·075005
·
IF 1.449
Xiaoxiao Zhang,Xiaogang Su,Bin Zhang,Jun Wang
The MnO2@CNFs hierarchical structures have been successfully synthesized through a facile hydrothermal reduction method. By controlling the addition amount of KMnO4, the electromagnetic parameters and microwave absorption performance can be tuned effectively. When the mass ratio of CNFs and KMnO4 was 4:1, the obtained composites exhibited strong reflection loss of −42.77 dB at 4.32 GHz with an absorbent thickness of 4.5 mm. Meanwhile, the effective absorption region was 2.8 GHz (13.07–15.87 GHz) at a thin thickness of 1.5 mm. The superior electromagnetic attenuation performance of MnO2@CNFs is ascribed to the unique hierarchical structure. Further, the MnO2 nanoflakes vertically growing on CNFs modulate the complex dielectric parameters of MnO2@CNFs, leading to well-matched characteristic impedance. In addition, the interlaced conductive network is also beneficial for dissipating the incident EM waves through multiple scattering in the large surface area of MnO2. Prospectively, the synthetic strategy proposed in our work can be extended to the fabrication of other carbon-based microwave absorbing composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-9
·
IF 5.705
Xue Qin,Cao Xuanyu,Zhang Cuiling,Xian Yuezhong
The authors describe an environmentally friendly and fast (~14 min) method for the synthesis of homogeneously distributed fluorescent polydopamine nanodots (PDA-NDs) using KMnO 4 as the oxidant. Alkaline phosphatase (ALP) catalyzes the hydrolysis of ascorbic acid 2-phosphate to release free ascorbic acid which undergoes an in-situ redox reaction with KMnO 4 . Depending on the activity of ALP, more or less KMnO 4 is consumed, and this affects the formation of the PDA-NDs. Based on this finding, a sensitive method was worked out to quantify the activity of ALP via real-time formation of fluorescent PDA-NDs. The fluorometric signal (best measured at excitation/emission peaks of 390/500 nm) is linear in the 1 to 50 mU·mL −1 ALP activity range, and the limit of the detection is as low as 0.94 mU·mL −1 (based on 3 σ/m). The method was successfully applied to the determination of ALP activity in spiked human serum and in MCF-7 cell lysates. It was also applied in a method to screen for inhibitors of ALP.
Schematic of a fluorometric method for the determination of alkaline phosphatase (ALP) activity. The method is based on the in-situ regulation of the formation of fluorescent polydopamine nanodots (PDA-NDs) through the competition between the KMnO 4 -induced polymerization of dopamine and ALP-directed ascorbic acid 2-phosphate (Asc-2P) hydrolysis. AA: Ascorbic acid.
研究领域:
生物化学
·
医学检测
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yue Gao,Xiangyi He,Rong Hu,Qing Li
In this study, we synthesized Ag-doped Au/Ag nanoclusters (GSH-Au/Ag NCs) with enhanced luminescence. We conducted a comprehensive investigation into the mechanism behind KMnO 4 -induced fluorescence (FL) quenching of these bimetallic nanoclusters and, leveraging this understanding, developed a sensitive fluorescent method for determining acid phosphatase activity (ACP). The fluorescence quenching mechanism was attributed to a combination of the inner filter effect (IFE) and redox reactions. Subsequently, ascorbic acid (AA) was generated from L-ascorbic acid 2-phosphate trisodium salt (AAP), which was selectively hydrolyzed by ACP . The released AA then reduced KMnO 4 , leading to the inhibition of fluorescence quenching of GSH-Au/Ag NCs by KMnO 4 . This innovative approach exhibited higher sensitivity, with a lower limit of detection of 0.0085 U/L (S/N = 3) for ACP activity sensing. Our proposed strategy was successfully applied to analyze ACP activity in human serum samples, demonstrating promising potential for the widespread utilization of metal nanoclusters in various applications.
研究领域:
生物化学
·
分析化学
·
纳米医学
✓ 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）