ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
JuanJuan Wang,Yuting Wang,Wenshu. Li,Xiaoge Wu
1000 kHz high-frequency ultrasound at 0.12 and 0.39 W/mL intensity was used to enhance the inactivation of suspensions of Microcystis aeruginosa cells using KMnO 4 . With 10 mg/L of KMnO 4 , ultrasound at 0.12 W/mL intensity was found to be effective in inactivating the cyanobacteria within 10 min. A Weibull model was found to describes the inactivation well. Its concave shape shows that some cells have a certain resistance to this treatment. Cytometry and microscopic analysis confirm that the treatment damages cell integrity. Despite that the extracellular organic matter in the water was not significantly increased. The concentration of extracellular cyanobacterial toxins even decreased. The filtered suspension of inactivated cyanobacteria was used to cultivate mung beans, and the suspension did not hinder their germination. This provides a new idea for using cyanobacteria-laden wastewater. These findings suggest a technique for speeding up the oxidation of Microcystis cells using KMnO 4 with ultrasound at moderate intensity, which provide new insights into the biological effects of ultrasound.
研究领域:
环境工程
·
微生物学
·
水处理
·
生物技术
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xianzhe Ma,Hanchen Wang,Shiying Yang
Carbon tetrachloride (CT) is a persistent chlorinated organic pollutant frequently detected at high concentrations in industrial wastewater. CT contains four Cl electron-absorbing substituents, which make it difficult to be oxidized but more prone to be reduced. Therefore, we presented a simple and ultrafast approach for the degradation of high-concentration CT by simple physical mixing of ZVAl and KMnO 4 without any addition of organic solvents. This integrated system not only achieved rapid reductive degradation of high-concentration CT under a broad pH range of 3–11 in minutes, but also exhibited strong resistance to interference from dissolved oxygen. During the process, ZVAl and KMnO 4 activated mutually, the mechanism involves following synergistic effects: (1) the oxidation of KMnO 4 promoted the destruction of the passive oxide film on ZVAl, facilitating continuous electron release; (2) these electrons in turn reduce KMnO 4 to generate strongly oxidizing Mn(III) species; (3) the Mn(III) further accelerates ZVAl activation through a self-reinforcing cycle, ultimately facilitating rapid electron-mediated CT reduction. ZVAl/KMnO 4 combined system is expected to realize the quick treatment of CT wastewater, particularly in emergency scenarios involving accidental releases of high-concentration CT.
研究领域:
环境化学
·
污染控制
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水处理技术
·
环境工程
·
应用化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yu Xie,Xiaoqi Ban,Wanzhong Yin,Ningbo Song,Jin Yao
Talc exhibits excellent floatability and, as a major silicate gangue mineral associated with chalcopyrite, significantly obstructs the purification and smelting of chalcopyrite. This study investigates the reverse flotation separation of chalcopyrite and talc using KMnO 4 as a depressant and DDA (dodecylamine) as a collector within a reverse flotation system. Single mineral flotation experiments show that after adding KMnO 4 , the recovery of chalcopyrite in 38–74 μm is only 6.86 %, whereas the recovery of talc in 45–106 μm and 25–45 μm are 93.47 % and 89.25 %, respectively. Further experiments with artificially mixed ores demonstrate that KMnO 4 effectively achieves the separation of chalcopyrite and talc. The depression mechanism of KMnO 4 on chalcopyrite and talc was analyzed using Zeta potential, contact angle measurement, AFM (atomic force microscopy), FTIR (Fourier transform infrared spectroscopy), XPS (X-ray photoelectron spectroscopy), and DFT (density functional theory) calculations. Mechanistic analysis indicates that in an alkaline environment, chalcopyrite can undergo a redox reaction with KMnO 4 , forming hydrophilic hydroxide species (Cu(OH) 2 , Fe(OH) 3 ) on the chalcopyrite surface, which depresses chalcopyrite flotation. In contrast, the surface properties of talc are relatively stable and difficult to react with KMnO 4 , which cannot depress the flotation of talc. Therefore, KMnO 4 can be used as an efficient and selective depressant for the reverse flotation separation of chalcopyrite and talc.
研究领域:
矿物加工工程
·
材料科学与工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yating Zhu,Xin Yang,Junlian Qiao,Xin Zhang,Xiaohong Guan
Bisulfite-activated permanganate oxidation (PM/BS) technology is an emerging oxidation process that can rapidly oxidize organic contaminants and degrade some permanganate-resistant organic contaminants. For the first time, the influences of PM/BS technology as a pre-oxidation process on the formation potentials of disinfection by-products (DBPFPs) during chlorination of humic acid (HA) solution and three natural water samples were investigated. The results revealed that PM/BS pre-oxidation only slightly affected the DBPFPs of HA in the absence of Br - although it changed the structure of HA according to the fluorescence characterization result. With the presence of Br - , PM/BS pre-oxidation enhanced the generation of trihalomethanes but inhibited that of nitrogenous DBPs (N-DBPs) during chlorination of HA. The toxic risk analysis showed that the toxicity of the generated DBPs from chlorinating HA solution without Br - only changed slightly after PM/BS pre-oxidation but it was decreased by 14% in the presence of 150 μg/L Br − due to PM/BS pre-oxidation. This should be associated with the inhibiting effect of PM/BS pre-oxidation on the generation of N-DBPs and several haloacetic acids in the presence of Br - . Because of the complex matrix of natural water samples, PM/BS pre-oxidation had minor influence on the amount and the potential toxicity of DBPs generated during chlorination. The above results suggested that PM/BS technology could be an alternative of the drinking water pretreatment.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2019
·
IF 1.536
Xiaofeng Wang,Beihai Zhou,Xia Shao
Dimethylamine-based pharmaceutical personal care products (DMA-based PPCPs) are a group of N-nitrosodimethylamine (NDMA) precursors. The acid dissociation constant (pKa) values of four DMA-based PPCPs were determined by potentiometric titration over the pH range of 3–11. The pKa values of ranitidine, nizatidine, doxylamine and carbinoxamine corresponding to the DMA moiety were 8.4, 6.8, 9.4 and 9.1, respectively. Competition reaction kinetics and pseudo-first-order reaction kinetics were used to determine the reaction rate constant (k) of the DMA-based PPCPs with O3, NaClO, ClO2 and KMnO4. Comparing the degradation rate constants of the four DMA-based PPCPs, the results of ClO2 oxidation were close, and for the other three oxidants, the order was kranitidine ≈ knizatidine > kdoxylamine ≈ kcarbinoxamine. Comparing the reaction rate of the four oxidants, for ranitidine and nizatidine, the order was kNaClO > kO3 > kKMnO4 > kClO2, and for doxylamine and carbinoxamine, the order was kO3 > kNaClO > kClO2 > kKMnO4.
研究领域:
环境科学
·
化学动力学
✓ 已验证
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Wang Yuhang,Ren Zhiqi,Sun Jiaxiu,Li Xinze,Huang Bin,Yang Jianwen
In this work, the effect of potassium permanganate (KMnO 4 ) pre-oxidation treatment on the electrochemical properties of LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM811) cathode materials was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) tests revealed that the pre-oxidation treatment promoted the oxidation of Ni 2+ to Ni 3+ and the formation of a stable Mn-rich surface. Electrochemical testing showed that the electrochemical performance of the NCM811 material pre-oxidized with an appropriate amount of KMnO 4 (811–3) was significantly improved at both ambient (25 ℃) and elevated temperatures (55 ℃) compared to the untreated sample. Additionally, the air stability of 811–3 was enhanced. Specifically, the pre-oxidation treatment increased the oxidation state of nickel, minimized side reactions with CO 2 and moisture in the air, and improved cycling stability, rate performance, and lithium-ion diffusion. It also resulted in a lower self-discharge rate, ensuring better long-term voltage retention. These results indicated that KMnO 4 pre-oxidation is an effective strategy for improving the electrochemical performance of NCM811 and has the potential for application to other Ni-rich cathode materials.
研究领域:
材料科学
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电化学
·
表面工程
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Li’na Qiao,Sihua Qian,Yuhui Wang,Hengwei Lin
Pesticides play a critical role in improving crop yield in modern agriculture, but their residues significantly harm the environment and human health. Herein, a novel and simple colorimetric sensor array built on sulfuric acid assisted KMnO 4 fading strategy has been developed for pesticides detection and discrimination. This sensor array is facilely fabricated by KMnO 4 and sulfuric acid through simply adjusting their concentrations and ratios. Hierarchical clustering analysis (HCA) demonstrates that the as-fabricated colorimetric sensor array has a high dimensionality, and shows excellent capability to recognize common kinds of pesticides from potential interferants. Semi-quantitative detection was achieved through combining HCA and corresponding fitting curves. Moreover, the proposed sensor array was successfully applied to detect pesticide residues (e.g. carbaryl) in real samples. The strategy described herein will not only “maximally” simplify the design and fabrication approach, but expand the application fields of colorimetric sensor array methodology towards weak-reactive analytes.
研究领域:
分析化学
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环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Hua Wei,Yunong Tang,Tamer Shoeib,Aimin Li,Hu Yang
The preoxidation effects of H 2 O 2 , NaClO, and KMnO 4 on the dewaterability of sewage sludge were compared by analyzing the changes in specific resistance to filtration (SRF), filter cake moisture content (FCMC), extracellular polymeric substance (EPS) fractions and components, and floc properties. The three oxidants varied in oxidation efficiency and exhibited distinctive mechanisms. NaClO not only destroyed sludge flocs and EPSs but also effectively caused cell lysis, resulting in release of a considerable amount of organic matters and subsequently significant deterioration of dewatering performance. The oxidation of H 2 O 2 and KMnO 4 was relatively mild and occurred mainly on the outer layers of the sludge flocs and cell-bound EPSs. By contrast, the SRF and FCMC of the sludge conditioned with a low dose of KMnO 4 were slightly improved, and a fraction of soluble EPS was compressed because of the coagulation effect of the oxidation product MnO 2 . The pH of the sludge conditioned with H 2 O 2 and KMnO 4 showed no considerable change. Meanwhile, NaClO evidently increased the alkalinity of the sludge because of the hydrolysis effect. After the pH of the NaClO-treated sludge was readjusted to 7.0, the partial protonation efficiency slightly alleviated the deterioration of sludge dewatering performance. The preoxidized sludge was then subjected to reflocculation treatment using FeCl 3 , polyacrylamide, and a cationic starch-based flocculant , respectively. The combined treatment of preoxidation and reflocculation showed a high dewatering efficiency owing to their synergistic effect.
研究领域:
环境工程
·
水处理
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Sustainability
·
2021
·Vol. 13
·期 5
·2641
·
IF 3.251
Siyao Bian,Shuang Xu,Zhibing Yin,Sen Liu,Jihui Li,Shuying Xu,Yucang Zhang
In this study, sequential KMnO4-promoted oxidative pyrolysis and H2O2oxidation were employed to upgrade the adsorption capacities of durian shell biochar for methylene blue (MB) and tetracycline (TC) in an aqueous solution. It was found that the KMnO4/H2O2co-modification was greatly influenced by pyrolysis temperature and the optimal temperature was 300 °C. Moreover, a low concentration of H2O2enabled the improvement of the adsorption capabilities greatly with the catalysis of pre-impregnated manganese oxides, addressing the shortcoming of single H2O2modification. The co-modified biochar exhibited high adsorption capabilities for MB and TC, remarkably surpassed KMnO4- and H2O2- modified biochars as well as pristine biochar. The increase of adsorption capabilities could be mainly contributed to the incorporation of MnOxand carboxyl by KMnO4-promoted oxidative decomposition and Mn-catalyzed H2O2oxidation. This would provide a novel and efficient method for preparing highly adsorptive biochar using sequential KMnO4-promoted oxidative pyrolysis and H2O2oxidation.Keywords:biochar;KMnO4/H2O2co-modification;methylene blue;tetracycline
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2015
·
IF 5.33
Xiyun Cai,Qingquan Liu,Chunlong Xia,Danna Shan,Juan Du,Jingwen Chen
The removal of aqueous micropollutants remains challenging because of the interference of natural water constituents that are typically 3–9 orders of magnitude more concentrated. Cyclodextrins, which feature molecular recognition and are widely applied in separation and catalysis, are promising materials in the development of pollutant treatment technologies. Here, we described the facile integration of cyclodextrin polymer (CDP) adsorption and KMnO4 oxidation for recyclable capture and destruction of aqueous micropollutants (i.e., antibiotics and TBBPA). CDP exhibited adsorption efficiencies of 0.81–88% and 0.81–94% toward 14 pollutants at 50.0 ng/L and 50.0 μg/L, respectively, at a solid-to-liquid ratio of 1:1250. The presence of simulated or natural water constituents (e.g., Mg2+, Ca2+, DOC, and a combination thereof) did not decrease the adsorption potential of CDP toward these pollutants because the pollutants, based on molecular specificity, were entrapped in the CD cavity. Subsequent KMnO4 oxidation completely degraded the retained pollutants, demonstrating that the pollutants could be broken down in the cavity. Pristine CDP was rearranged into the structurally loose composites that featured a porous CDP architecture with uniform embedment of δ-MnO2 nanoparticles and different adsorption efficiencies. δ-MnO2 loading was a linear function of the number of times the integrated procedure was repeated, underlying the accurate control of CDP recycling. Thus, this approach may represent a new method for the removal of aqueous micropollutants.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2017
·Vol. 33
·期 1
·138-144
·
IF 1.509
Liping Zhang,Jianguo Zhang,Hongqi Chen,Lun Wang
An redox luminescence switch was developed for the sensing of glutathione (GSH), l -cysteine (Cys) or l -ascorbic acid (AA) based on redox reaction. The Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanorods (UCNRs) with an emission peak located in the red region were synthesized. The luminescence intensity of the UCNRs could be quenched due to the Mn 2+ could be oxidized to MnO 2 by KMnO 4 . Subsequently, when the AA, GSH or Cys was added into the MnO 2 modified upconversion nanosystem, which could reduced MnO 2 to Mn 2+ and the luminescence intensity was recovered. The concentration ranges of the nanosystem are 0.500–3.375 mM (R 2 = 0.99) for AA, 0.6250–11.88 mM (R 2 = 0.99) for GSH and 0.6250–9.375 mM (R 2 = 0.99) for Cys, respectively.
研究领域:
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Mei An,Xiaoxiang Cheng,Xinsheng Luo,Tao Yang,Xianpeng Sun,Jingtao Xu,Dao Xiao,Daoji Wu,Heng Liang
Ultrafiltration (UF) is a highly efficient technique for algal-rich water purification, but it is heavily contaminated due to the complex water characteristics. To solve this problem, potassium permanganate (KMnO 4 ) oxidation enhanced with sodium sulfite (Na 2 SO 3 ) was proposed as a pretreatment means. The results showed that the end-normalized flux was elevated from 0.10 to 0.91, and the reversible fouling resistance was reduced by 99.95%. The membrane fouling mechanism also changed obviously, without the generation of cake filtration. Regarding the properties of algal-rich water, the zeta potential was decreased from −29.50 to −5.87 mV after KMnO 4 /Na 2 SO 3 pretreatment, suggesting that the electrostatic repulsion was significantly reduced. Meanwhile, the fluorescent components in algal-rich water were significantly eliminated, and the removal of dissolved organic carbon was increased to 67.46%. In the KMnO 4 /Na 2 SO 3 process, reactive manganese species (i.e., Mn(V), Mn(III) and MnO 2 ) and reactive oxygen species (i.e., SO 4 •− and • OH) played major roles in purifying algal-rich water. Specifically, SO 4 •− , • OH, Mn(V) and Mn(III) could effectively oxidize algal pollutants. Simultaneously, the in-situ adsorption and coagulation of MnO 2 could accelerate the formation of flocs by decreasing the electrostatic repulsion between cells, and protect the algal cells from being excessive oxidized. Overall, the KMnO 4 /Na 2 SO 3 process showed significant potential for membrane fouling alleviation in purifying algal-rich water.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
PubMed
高影响因子
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