ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 11
·10166-10171
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IF 2.741
Zhou Jia-heng,Chen Kai-bo,Hong Qian-kun,Zeng Fan-cheng,Wang Hong-yu
The oxidation of chloramphenicol (CAP) by potassium ferrate (VI) in test solution was studied in this paper. A series of jar tests were performed at bench scale with pH of 5–9 and molar ratio [VI/CAP] of 16.3:1–81.6:1. Results showed that raising VI dose could improve the treatment performance and the influence of solution pH was significant. VI is more reactive in neutral conditions, presenting the highest removal efficiency of CAP. The rate law for the oxidation of CAP by VI was first order with respect to each reactant, yielding an overall second-order reaction. Furthermore, five oxidation products were observed during CAP oxidation by VI. Results revealed that VI attacked the amide group of CAP, leading to the cleavage of the group, while benzene ring remained intact.
研究领域:
环境科学
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化学工程
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PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2020
·
IF 1.724
Liang Xu,Fenglian Fu
In order to treat selenium pollution, the study presents the use of potassium ferrate (K2FeO4) as an environmentally friendly agent for in situ removal of Se(IV) from aqueous media. Batch experiments were carried out to evaluate the influences of various factors including dosage of K2FeO4, ex-situ and in-situ adsorption, initial pH, and adsorption isotherms. The results showed that increasing dosage of K2FeO4 benefited the removal of total selenium with the efficiency up to 97.0% and Se(IV) removal significantly depended on pH, and as the pH increases, the decrease in Se(IV) adsorption efficiency is a general trend of pH dependence. The X-ray powder diffraction, Fourier transformed infrared spectrometer and high-resolution X-ray photoelectron spectroscopy analysis indicated that Se(IV) was removed from the aqueous solution by adsorbing on the surface of the decomposition products of K2FeO4 which are ferric oxide nanoparticles, and the selenium adsorbed on the generated ferric oxide nanoparticles existed in the forms of Se(IV) and Se(VI). Se(IV) and Se(VI) were adsorbed to the decomposition products of K2FeO4 by forming an inner-sphere complexes and an outer-sphere complexes, respectively.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Xiaoyang Shi,Ran Bi,Baoling Yuan,Xiaobin Liao,Zhenming Zhou,Fei Li,Wenjie Sun
Microcystis aeruginosa ( M. aeruginosa ) commonly blooms in summer while Cyclotella meneghiniana ( C. meneghiniana ) outbreaks in fall in water reservoirs of Southeast China. Pre-oxidation has been demonstrated to enhance the algae removal from chemical coagulation processes. However, excessive dosage of pre-oxidant can increase the disinfection by-products formation potential (DBPsFP). Additionally, the DBPs formation mechanisms from algae during the pre-oxidation-coagulation-chlorination processes have not well elucidated. In this study, the objectives were to investigate the trichloromethane (TCM) formation, the changes of water quality indexes, and the morphology changes of algal cells from M. aeruginosa or C. meneghiniana contaminated water during potassium permanganate (KMnO 4 ) or chlorine (Cl 2 ) pre-oxidation-coagulation-chlorination disinfection. The results showed that the TCM yield for two algal species decreased with the dosage increase of KMnO 4 pre-oxidation, but increased with the dosage increase of pre-chlorination. Therefore, the 2.0 mg/L KMnO 4 or 0.5 mg/L Cl 2 was proposed as the optimal dosage for preventing both M. aeruginosa blooms in summer and for C. meneghiniana outbreaks in fall. M. aeruginosa exhibited a slightly higher TCM yield than C. meneghiniana in these treatment processes. Based on the release of potassium (K) ion and SEM analysis, KMnO 4 had less damage on cell integrity than Cl 2 at the dosage ≤2.0 mg/L. In addition, C. meneghiniana was easier to be disrupted by both pre-oxidants than M. aeruginosa , combining with subsequent coagulation led to different value of dissolved organic carbon (DOC), UV–visible absorbance (UV 254 ) and turbidity .
研究领域:
环境科学
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水处理工程
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8902-8913
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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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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
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材料科学与工程
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xulong Zhang,Xiaoyan Liu,Shiwei Xie,Xian Liu
This study is first to elucidate the efficacy of electrochemical activation of periodate (PI) by permanganate (PM) in enhancing the degradation of bisphenol A (BPA) over a wide pH spectrum. Utilizing a current density of 4 mA/cm 2 , 200 μM PI, and 20 μM PM, the proposed system achieved a 99.8 % degradation of 40 μM BPA within 30 min and a 65.5 % total organic carbon (TOC) removal in 120 min. The combined system yielded a synergistic coefficient of 15.23 for BPA degradation, and energy efficiency of 0.14 KWh•m −3 . The exceptional performance is attributed to the reduction of PM to low-valent manganese species at the cathode, which facilitates the activation of PI. Additionally, the system preserved high BPA degradation efficiency across a pH range of 3–11. Radical quenching and electron paramagnetic resonance spectroscopy experiments confirmed the pivotal role of singlet oxygen in the degradation process. Furthermore, the system exhibited relative insensitivity to actual water matrix constituents, including inorganic ions and humic acid. In conclusion, the proposed system constitutes an eco-friendly treatment process for BPA removal characterized by low energy consumption.
研究领域:
环境科学
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水处理技术
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Shu-Hua Han,Dan-Dan Huang,Zhang-Jian Cheng,Ai-Lin Liu,Yun Lei
Most known chemiluminescence (CL) systems are flash-type that generate weak luminescence and decline quickly after dozens of seconds, while the glow-type CL systems have stable emission for an extended period to achieve accurate quantitation. In this work, a long-term CL system based on hydrazine-hydrate (N 2 H 4 ·H 2 O) modified carbon quantum dots (N-CQDs) as a luminescent probe, with K 2 S 2 O 8 and H 2 O 2 as co-reactants, was proposed. The CL emission enhanced by H 2 O 2 increased 18-fold more than that of N-CQDs and K 2 S 2 O 8 direct reaction, and decayed by 5% of the maximum intensity over 700 s. In the reaction system, K 2 S 2 O 8 and H 2 O 2 co-reactants can promote each other to continuously generate corresponding radicals (•OH, O 2 •− , 1 O 2 ), which in turn trigger the CL emission of N-CQDs. This phenomenon was identified as the primary cause for the production of persistent CL. In addition, a stable and selective CL sensor based on the N-CQDs-K 2 S 2 O 8 -H 2 O 2 CL enhancing system was developed for ascorbic acid quantitation in the linear range from 0.1 to 10.0 mM with a detection limit of 0.036 mM. The method has been applied to the analysis of tablet samples and holds potential in pharmaceutical analysis field.
研究领域:
分析化学
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材料科学
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
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IF 1.6
Zhang Yong,Liu Xuan,Jiang Kexing,Feng Jiaqi,Liu Yujia
In this study, peanut shell was used as the raw material to synthesize activated biochar-MnO composite (PSBC-K) using KMnO 4 as an activating agent. The Q max of U(VI) by PSBC-K was 569.8 mg/g, which was 3.9 times the Q max of PSBC (147.3 mg/g). Besides, PSBC-K exhibited good selectivity for U(VI) and excellent cycling performance. The removal mechanisms of U(VI) for PSBC-K were primarily dominated by electrostatic interaction, coordination reaction, precipitation and ion exchange. Overall, this work presented a sustainable and straightforward method for creating a novel adsorbent for efficient U(VI) separation.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
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IF 2.8
Wei Zhao,Yifan Song,Zhen Song,Jiaxin Li,Yuanjing Zhang,Wenxia Zhao,Huaijun Chen,Yangyang An,Ziyan Wang,Siyu Ma,Haoxian Li,Wenzhuo Ma,Kaihong Hui
Polycarbonate-acrylonitrile-butadiene-styrene (PC-ABS) has been treated with an aqueous solution of N -methylpyrrolidone (NMP) and ethanol (C 2 H 5 OH) under conditions that achieve a controlled level of polymer swelling. In addition, the micro-etching effect of alkaline potassium permanganate on PC-ABS was investigated using a low environmental impact binary micro-etching system. The effect of NaOH concentration, etching time, and temperature on surface roughness, morphology, wettability, and PC-ABS adhesion strength has been examined. The PC-ABS surface characteristics were analyzed using field emission scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform-infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results have demonstrated that the surface morphology was altered after micro-etching, with an increase in surface roughness ( R a ) from 9.69 to 316 nm. In addition, the contact angle decreased from 92.2° to 30.1°, and the adhesion strength increased to 0.88 kN/m. The findings of this study have established an effective micro-etching process using alkaline potassium permanganate that enhances the wettability, surface roughness, and adhesion strength of the PC-ABS copolymer.
研究领域:
材料科学
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表面工程
·
高分子化学
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高影响因子
Food Packaging and Shelf Life
·
2019
·
IF 3.63
Li-Xian Zhu,Qin-Bao Lin,Jia-Yi Li,Hong-Mei Zhu,Hong-Sheng Ma,Huai-Ning Zhong,Jing-Jing Pan
In this study, potassium permanganate (KMnO 4 ) consumption on some key raw materials of food contact paper was analyzed, the content of lignin and total sugar in water simulant for KMnO4 consumption test was analyzed by GC–MS and UV–vis respectively, and the contribution to KMnO4 consumption of the paper samples from lignin and total sugar was investigated. The results have shown that cassava starch has the highest KMnO 4 consumption value among all the starches analyzed, and the KMnO 4 consumption of lignin was significantly greater than that of starches and glucose. KMnO 4 consumption of 15 different commercial paper samples and 10 different commercial fiber molding products were analyzed. The results indicated that KMnO 4 consumption of 12 commercial paper samples were exceeded the limit of 40 mg/kg set forth in GB 4806.8 national food safety standard for food contact paper and paper article. The contribution to the KMnO 4 consumption value of paper samples and fiber mold products from lignin and total sugar in water simulant was from 42% to 94% in most of the samples, lignin and total sugar were two main sources of KMnO 4 consumption in food contact paper. It is known that lignin and total sugar are nature materials and they are non-hazardous, which is not appropriate to set such control limit in the food safety standard, therefore, the limit of KMnO4 consumption for food contact paper and paperboard in GB4806.8-2016 should be revised.
研究领域:
食品安全
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分析化学
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 47
·27593-27601
·
IF 3.049
Lu Luo,Yongjian Ge,Shuyu Yuan,Yanghai Yu,Zhou Shi,Shiqing Zhou,Jing Deng
Ever-increasing efforts have been made to develop rapid and practical conditioning methods of sludge dewatering. This study demonstrated an innovative combination of potassium permanganate (KMnO4) and peroxymonosulfate (PMS) for sludge dewatering. The combined use of KMnO4 and PMS (KMnO4/PMS) showed its superiority in improving sludge dewaterability over the separate use of KMnO4 or PMS. By dosing 4 mmol g−1 VSS KMnO4 and 3 mmol g−1 VSS PMS, the dewaterability of waste activated sludge (WAS) significantly enhanced as capillary suction time (CST) decreased from 73.65 s to 24.65 s while the water content of dewatered sludge cake (WC) decreased from 78.96% to 70.47%. Apart from CST and WC, the KMnO4/PMS process could also affect negative zeta potential, sludge flocs size and the concentrations of protein and polysaccharide in extracellular polymeric substances (EPS). The enhanced sludge dewaterability and changes of the physicochemical characteristics of the WAS samples during the KMnO4/PMS process were actually ascribed to sulfate radicals (SO4˙−) and hydroxyl radicals (HO˙) in situ generated via PMS activation by manganese oxides (MnOx) in the states of MnO2 and Mn3O4 transferred from KMnO4 oxidation, which was verified by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) techniques and radical scavenging experiments. Moreover, the Fourier transform infrared spectroscopy (FTIR) analysis further confirmed that the in situ generated SO4˙− and HO˙ could improve sludge dewaterability. Thus, the KMnO4/PMS process could be considered as a promising conditioning method of sludge dewatering.
研究领域:
环境科学
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污水处理
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
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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高影响因子
危险品化学品经营许可证（带存储）