CERAMICS INTERNATIONAL
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2019
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IF 3.45
Cheng Zhang,Runping Li,Jianhua Liu,Guo Chen,Shenghui Guo,Lei Xu,Shijie Xiao,Zhigang Shen
The effects of modification temperature and time on polyacrylonitrile (PAN) fibers under various concentrations of KMnO 4 were studied. Wettability , colouration, chemical structure (Fourier transform infrared spectroscopy), crystal structure (X-ray diffraction), stack domains (D), interlayer spacing (d), microscopic structure (Scanning electron microscopy) and elemental content (energy dispersive spectroscopy) were analysed. Aside from its good hydrophilicity, KMnO 4 at 2 and 4 wt% are beneficial to the modification of PAN fibers. The colouration of the fiber at 80 °C is the most obvious. The clear peak of the pre-oxidised fibers at 2340 cm −1 corresponds to the conjugated structure of MnO 4 –C N. At 4 wt%, the degree of pre-oxidation is too high and the main infrared peak disappears. M 2, 30 has a minimum D of 9.320 nm and 8.258 nm at 2θ = 16.883° and 2θ = 29.673°, respectively, and the fiber crystals are the finest. At a content of 4 wt%, the fibers are axially cracked and crystals appear on the surface. M 2, 30 and M 2, 60 have a close percentage of C element, whereas M 2, 30 has a lower percentage of Mn element. The best modification conditions of KMnO 4 are 2 wt%, 80 °C and 30 min.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ANALYST
·
2019
·Vol. 145
·期 3
·836-843
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IF 4.019
Yong Wang,Lulu Cai,Qi Wang,Mingming Zhao,Lina Dong,Kai Xu,Jingjing Li
Transition-metal dichalcogenides (TMDCs) have attracted a lot of attention due to their electronic, optical, mechanical, and catalytic properties. In addition, TMDCs possess rich redox chemistry that enables the decoration of metal nanoparticles directly on their surfaces. In this paper, MnO2/MoS2 nanocomplexes were obtained by the spontaneous reduction of KMnO4 with MoS2 QDs as the reductive agent. The formed MnO2/MoS2 nanocomplexes exhibited activated fluorescence and MR imaging signal in the presence of glutathione (GSH). After conjugation with an AS1411 aptamer, specific in vivo MR imaging and fluorescence labeling of the 786-O tumor cells were realized, showing their promising potential for biomedical applications.
研究领域:
材料科学
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纳米技术
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生物医学工程
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癌症研究
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DOI
PubMed
高影响因子
BIOMATERIALS
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2022
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IF 15.304
Haiyan Pan,Quan Zou,Tingting Wang,Dong Li,Shao-Kai Sun
Diverse oxygen generation strategies have been developed to overcome hypoxia in tumors for enhancing the therapeutic efficacy, but inevitably suffering from tedious synthesis process of oxygen generators in vitro before in vivo administration. Herein, we show direct injection of commercially and clinically used KMnO 4 into solid tumors enables in situ formation of MnO 2 as an oxygen depot for cascade oxidation damage and enhanced photodynamic therapy. KMnO 4 can damage tumor tissues by oxidation and generate MnO 2 , and subsequent intravenous injection of Ce6 allows MnO 2 -triggered hypoxia-modulated photodynamic therapy of tumors. Excellent cascade tumor suppression effect is realized both in vitro and in vivo based on the KMnO 4 –Ce6 system without the need of synthesis. The proposed strategy lays down a novel way with unprecedented superiors of no need of synthesis process and ultra-facile administration procedure for tumor hypoxia-modulated cascade therapy.
研究领域:
肿瘤学
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生物医学工程
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药理学
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DOI
PubMed
高影响因子
RESOURCES CONSERVATION AND RECYCLING
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2021
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IF 10.204
Shun Zhang,Shiyu Miao,Xiaoqiang An,Huachun Lan,Ruiping Liu,Jianfeng Peng,Huijuan Liu,Jiuhui Qu
Many efforts have been made to improve the dewaterability during anaerobically digested sludge (ADS) conditioning. However, the conversion of substances in ADS conditioning, as an important process of sludge treatment and application, has received little attention. This study investigated the transformation process of typical components in sludge such as extracellular polymeric substances (EPS), sulfide, Fe and Mn species. The effects of KMnO 4 dosage and pH change on the ADS conditioning were investigated in detail. The results showed that the sludge particle size and capillary suction time decreased with the increase of KMnO 4 dosage. The water content of sludge cake by vacuum filtration gradually dropped from 84.5% to 78.8% after conditioning with 0–5.0 g KMnO 4 /L sludge. Based on fluorescence excitation-emission matrix, EPS and dissolved organic carbon measurements, the improvement of sludge dewaterability was due to the disruption of EPS and the release of intracellular substances. Interestingly, 11.5% sulphides (S 2− ) in ADS were oxidized into SO 4 2− at KMnO 4 dosage of 3.0 g/L, which can effectively inhibit the release of hazardous H 2 S even the sludge pH changed to 2 in conditioning process. Moreover, about 30 mg/L of PO 4 3− in centrifugate can be completely immobilized by the generated iron, manganese and their binary oxides as a result of the interaction between Fe 2+ and KMnO 4 . These findings provided a new insight to explore the sludge conditioning process and the transformation of typical components.
研究领域:
环境科学
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污水处理
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DOI
高影响因子
WATER RESEARCH
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2019
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IF 7.913
Yao Ma,Yuan Feng,Yulin Feng,Gaoming Liao,Yue Sun,Jie Ma
Controlled release materials (CRMs) are emerging oxidant delivery techniques for in-situ chemical oxidation (ISCO) for groundwater remediation . Successful implementation of CRM relies on good understandings of the kinetics and mechanism of controlled release of reactive agents. In this study, batch experiments and model simulations were conducted to explore the impacts of CRM properties (composition and size) and environmental conditions (temperature, pH, water volume and anions) on KMnO 4 release from KMnO 4 -paraffin controlled release beads. Experimental results indicated that higher KMnO 4 : paraffin mass ratio resulted in shorter release longevities and higher release rate. Larger bead resulted in lower release rate, longer release longevity, and more KMnO 4 released. Higher incubation temperature resulted in higher release rate and shorter release longevity, but did not affect the total mass of KMnO 4 released. Acidic pH decreased the total mass of KMnO 4 released while alkaline pH did not affect KMnO 4 release. The presence of SO 4 2− , CO 3 2− , Cl − and Br − had negligible impacts on KMnO 4 release. A dissolution-diffusion conceptual model was developed. The above experimental observation and the associated controlled release mechanisms can be qualitatively explained by the conceptual model. A more detailed two-film boundary mathematical model was developed to simulate KMnO 4 release process. Comparison of modeling results with experimental data suggest that the new mathematical model gave a good quantitatively predication. Overall, this study shows that properly designed CRM can sustain release for years, thus representing a cost-effective and low-maintenance groundwater remediation technology . Both CRM properties and environmental conditions significantly affect the release kinetics and longevity, therefore these factors should be considered in the design and maintenance of CRM-based ISCO system.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING COMMUNICATIONS
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2019
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IF 1.431
Yu Li,Liu Quanjun,Li Shimei,Song Chao,Gao Yang,Song Jianwen
The mechanism of carboxymethyl cellulose (CMC) on the galena surface and the enhancement of KMnO4 on the depression of CMC to galena were investigated by flotation test, surface adsorption experiments, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), and X-ray photoelectron spectroscopy (XPS). Flotation test results indicated that the addition of KMnO4 under alkaline condition significantly enhanced the depression effect of CMC on galena. Surface adsorption experiments of butyl xanthate (BX) and CMC demonstrated that the adsorption amount of BX decreased after CMC was added into the pulp. And the adsorption amount of CMC increased while BX decreased sharply when KMnO4 was added into the pulp. After galena was treated with KMnO4 and CMC, dim spots (oxidation sites) on the surface of galena were observed by SEM-EDS. Results showed the high contents of C and O on the oxidation sites. XPS results indicated that oxidation-reduction reaction occurred on the mineral surface, and PbS2O3 or Pb(OH)2 was probably the main component of the oxidization sites. The CMC could be adsorbed on the oxidation sites by the hydrogen bond to form a hydrophilic membrane on the mineral surface lead to galena depression. All results showed that KMnO4 could enhance the depression effect of CMC on galena.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Yuangan Chen,Bo Feng,Jinxiu Peng,Ziming Wang
An effective reagent combination plays a crucial role in the flotation separation of galena and sphalerite. In this work, potassium permanganate (KMnO 4 ) was used to amplify the property difference between galena and sphalerite, carboxylated chitosan (CCS) was used to selectively depress sphalerite. The mechanism of CCS in the separation of galena and sphalerite was investigated by microcalorimetric measurements, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The results indicated that the rate of sphalerite oxidation by KMnO 4 is significantly faster than galena, and more metal oxides will be produced on the surface of sphalerite. The metal oxides provided active sites for CCS to adsorb on the surface of sphalerite via chemisorption, and the adsorption of CCS hindered the further adsorption of potassium butylxanthate (PBX). Meanwhile, the slower oxidation rate of galena means that fewer metal oxides are produced. In addition, CCS is mainly adsorbed on the surface of galena through physical adsorption, which is easy to fall off, so the surface of galena can further adsorb PBX. Thus, flotation separation of galena and sphalerite is achieved.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
DESALINATION
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2026
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IF 9.9
Ning Ma,Ruirui Jiang,Jielin Shi,Xinwei Kang,Jinyu Li,Feiyue Ge,Feilong Zhang,Feiyong Chen,Daliang Xu,Xuewu Zhu
KMnO 4 pre-oxidation tuned pore size, surface charge, and hydrophilicity of NF270. • Temperature-dependent oxidation increased roughness, added oxygen groups, and decreased PA crosslinking. • The optimized NFM-T50 achieved higher water permeance and moderate Ca 2+ /Mg 2+ passage. • Enhanced hydrophilicity and superior selectivity reduced gypsum scaling and improved flux recovery. Despite ensuring high rejection properties, the dense and highly cross-linked network of polyamide (PA) nanofiltration (NF) membranes limits their ability to selectively distinguish between ions with different charges due to the dominance of physical sieving, resulting in the excessive rejection of minerals beneficial to human health. To overcome this performance limitation, this study proposes a temperature-controlled potassium permanganate (KMnO 4 ) post-treatment strategy. The controlled de-crosslinking of the PA network allows for the simultaneous regulation of the pore size, charge, and hydrophilicity of the membrane. KMnO 4 oxidation selectively attacks amide linkages within the PA matrix, incorporating oxygen-containing functional groups, increasing surface roughness, and reducing crosslink density. Under optimized conditions (50 °C, 5 wt% KMnO 4 , 30 min), the resulting membrane (NFM-T50) exhibits a markedly more negative surface charge and enhanced hydrophilicity. These structural and chemical changes increase pure water permeance to 19.4 L m −2 h −1 bar −1 while sustaining a high Na 2 SO 4 rejection of 93.9% and enabling moderated passage of Ca 2+ and Mg 2+ . The reduced divalent cation rejection mitigates gypsum supersaturation at the membrane interface, yielding substantially improved scaling resistance, with flux recovery exceeding 83.0% across repeated fouling-cleaning cycles. Overall, this study demonstrates that moderate KMnO 4 -driven oxidative decrosslinking is a practical and effective approach to simultaneously enhance permeance, selective mineral retention, and anti-scaling performance in commercial PA nanofiltration membranes. Download: Download high-res image (226KB) Download: Download full-size image
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DOI
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Hao Xue,Hong Zheng,Jing Xiang,Ke Cheng,Biyue Zhu
In this work, using discarded white pomelo peel as the green precursor and hydrochloric acid (HCl) as the dopant, water-soluble Cl-N-doped carbon dots (Cl-NCDs) with excellent performance were synthesized by one-step hydrothermal method. The Cl-NCDs function as both luminescent agents and catalysts, significantly enhancing the chemiluminescence intensity of the HCl-HCHO-KMnO 4 system, forming a novel HCl-HCHO-(Cl-NCDs)-KMnO 4 chemiluminescence system. The addition of erythromycin (EM) solution inhibits the chemiluminescence intensity of new system. By optimizing the conditions, we established a simple, cost-effective, and reliable chemiluminescence method for EM detection, offering a linear range of 5-100 μM and a detection limit of 0.0149 μM. In addition, this method was successfully applied to the analysis of EM in various water simples, achieving recovery rates ranging from 97.6% to 106%.
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DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Mengxin Yu,Yu Qian,Maofei Ni,Zhikang Wang,Ping Zhang
In this study, we examined the modulation of algae removal and algal organic matter (AOM) chemistry by potassium permanganate and poly-aluminum chloride (KMnO 4 -PAC) in simulated karst water. Specifically, we verified the compositional changes of AOM sourcing from Chlorella sp. and Pseudanabaena sp. in response to the presence of divalent ions (Ca 2+ and Mg 2+ ). Aromatic protein and soluble microbial products were identified as the primary AOM components. Divalent ions accelerated dissolved organic carbon (DOC) and UV 254 removal, particularly with Pseudanabaena sp. greater than Chlorella sp. (P < 0.05). Surface morphology analysis manifested that the removal of filamentous Pseudanabaena sp. was more feasible in comparison to globular Chlorella sp.. Our results highlight the significance of divalent ions in governing chemical behaviors and subsequent removal of both algae and AOM. This study upscales the understanding of the interactions among divalent ions, algae and AOM during preoxidation and coagulation process in algae-laden karst water.
研究领域:
环境科学
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水处理
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化学工程
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Yi Shi,Yan Zhang,Yanru Cui,Jianrong Shi,Xiaoyan Meng,Jingyi Zhang,Hua He
Here, a porous superparamagnetic composite material magnetic β-cyclodextrin polymer (MNPs/β-CDP) was prepared and characterized as a adsorbent that may be used for the degradaion of acetaminophen (APAP) in aqueous solution by coupling with potassium permanganate (KMnO 4 ) oxidation. The results of adsorption properties investigation showed that the adsorption rate and capacity of MNPs/β-CDP were better than the component materials. When coupled with KMnO 4 oxidation, the degradation efficiency were evaluated with regards to the pseudo-first-order kinetics of 4-CP degradation. As an oxidation reactor, the material effectively alleviated the secondary pollution and water coloration caused by oxidation of KMnO 4 . Moreover, the materials were directly regenerated by the reaction of KMnO 4 with APAP adsorbed in its cavities without additional elution treatment, making it more convenient and environmentally friendly. The repeated degradation experiments demonstrated that MNPs/β-CDP had mechanic stability and reusability. The findings provide novel ideas for the degradation of persistent contaminants in water environments.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8902-8913
·
IF 2.914
Sun Chen,Chen Tong,Huang Qunxing,Wang Jun,Lu Shengyong,Yan Jianhua
Novel KMnO 4 -treated magnetic biochar (FMBC) was successfully synthesized by addition of Fe(NO 3 ) 3 during carbonization and KMnO 4 treatment following for Pb(II) and Cd(II) adsorption. SEM-EDS, XPS, and ICP-AES were used to evaluate the FMBC and magnetic biochar (FBC) on surface morphology, surface chemistry characteristics, surface functional groups, and Pb(II) and Cd(II) adsorption behavior. Results showed that the Langmuir maximum adsorption quantity of FMBC reached 148 mg/g for Pb(II) and 79 mg/g for Cd(II), nearly 7 times of that of FBC. The enhancement of FMBC for heavy metal adsorption was due to the successful load of manganese oxides and the increased oxygen functional groups consistent with XPS and FTIR results. The adsorption capacities of FMBC were maintained over 95% when the pH value was higher than 2.5 and 3.5 for Pb(II) and Cd(II), respectively. The adsorption performances of both heavy metals by FMBC were hardly influenced by ionic strength and humid acid. The adsorption capacities of FMBC could maintain over 50% and 87% after four cycles for Pb(II) and Cd(II), respectively. The saturation magnetization of FMBC was about 11.5 emu/g, which did not change after adsorption. This work proposed a new method to fabricate a magnetic biochar with high adsorption capacities of heavy metals Pb(II) and Cd(II).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）