Analytical Methods
·
2016
·Vol. 8
·期 20
·4056-4063
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IF 1.915
Shifeng Li,Li Zhang,Lei Chen,Yiman Zhong,Yonghong Ni
ZnSe quantum dots (QDs) with a homogeneous size distribution and good stability were synthesized by the reaction of zinc acetate and NaHSe in the presence of glutathione (GSH). The obtained ZnSe QDs were characterized using transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). Simultaneously, UV-visible spectroscopy (UV-vis) was performed and the fluorescence properties of ZnSe QDs were investigated. The effect of ZnSe QDs on the luminol–potassium periodate (KIO4) chemiluminescence (CL) system, a popular model CL system, was researched. It was found that as-prepared ZnSe QDs could strongly enhance the chemiluminescence (CL) of the luminol–KIO4 system. To discuss the mechanism of the CL enhancement, we studied the UV-vis and CL spectra of the luminol–KIO4–ZnSe QDs system. The CL enhancement should be attributed to the oxidation of luminol to its excited state by KIO4, under the catalysis of ZnSe QDs, which caused strong light emission. It was found that rutin, p-t-butylprocatechol, catechol, paracetamol, resorcinol and tryptophan could markedly inhibit the CL of the luminol–KIO4–ZnSe QDs system among 17 kinds of amino acids and 23 other kinds of organics. The above phenomena presented good linear relations. Thus, effective methods to detect them were developed.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Haining Song,Haifeng Zhou,Qianqian Zhuang,Zexin Li,Fenglei Sun,Zhenlei Yuan,Youxin Lou,Guangjun Zhou,Yujun Zhao
Oxidizing ClO − and IO 4 − exist widely in environment and are closely related to the health of organisms. Accordingly, fast, sensitive, and direct detection of the two species is significant. Using IFE in UCNPs @PAA and Fe(II)-phenanthroline system, an elegant ratiometric fluorescent nanosensor , without noble metal nanoparticle , was designed for the detection of ClO − and IO 4 − . Fe(II)-phenanthroline complex is used as fluorescent absorber, which can quench green light of UCNPs with gradually varied extent depending on the concentration of Fe(II). The linear zone extends to 800 and 120 μmol/L while the detection limit is 1.30 and 0.58 μmol/L for NaClO and NaIO 4 , respectively. Finally, the nanosensor was successfully applied to detect NaClO and NaIO 4 spiked in milk, spring water, and tap water with good recoveries.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 22
·14726
·
IF 4.614
Hong Xiao,Qing Liu,Yingjun Wang,Ying Zhu,Dexin Fang,Ganxue Wu,Zhenxing Zeng,Hong Peng
Fe(II)-activated potassium periodate (KIO4) oxidation was used to improve the dewaterability of waste-activated sludge for the first time. Compared with those of raw sludge, the capillary suction time (CST), specific resistance filtration (SRF), and water content of filter cake (WC) of sludge treated using the Fe(II)/KIO4process under the optimal conditions (i.e., the initial pH = 6.8, KIO4dose = 1.4 mmol/g volatile suspended solids, Fe(II)/KIO4molar ratio = 1.2) decreased by 64.34%, 84.13%, and 6.69%, respectively. For conditioned sludge flocs, the Zeta potential and particle size were increased, and hydrophilic proteins in extracellular polymeric substances (EPS) were partly degraded, accompanied by the transformation of tightly bound EPS into soluble EPS and the conversion of dense sludge flocs into loose and porous ones. During Fe(II)/KIO4oxidation, Fe(IV) and the accompanying•OH were determined as the predominant reactive species and the underlying mechanism of sludge EPS degradation was proposed. This work provides a prospective method for conditioning the sludge dewaterability.Keywords:sludge dewaterability;ferrous ion;potassium periodate;extracellular polymeric substances
研究领域:
环境工程
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废水处理
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Qifang Zheng,Liuyang Dong,Peilun Shen,Dianwen Liu
Magnetic separation poses challenges for the effective separation of chalcopyrite and pyrrhotite. Therefore, flotation separation has emerged as a key research focus. This study investigated the oxidative properties and flotation behavior associated with the separation of chalcopyrite and pyrrhotite using sodium periodate (NaIO 4 ). The results of flotation test show that without adding depressant, the recovery of chalcopyrite and pyrrhotite were 91.57 % and 90.15 %, respectively. When addition of 1 × 10 –3 mol/L NaIO 4 and 1 × 10 –4 mol/L potassium butyl xanthate, chalcopyrite and pyrrhotite achieved recovery of 88.25 % and 15.41 %, respectively. This effectively promoted the flotation separation of the two minerals. The NaIO 4 oxidation reduced pyrrhotite’s surface hydrophobicity by forming hydrophilic species. The S 2– and Fe 2+ species on the pyrrhotite surface were oxidized to hydrophilic SO 4 2– and Fe 3+ species, potentially forming FeOOH – species and sulfate films that hindered collector adsorption. However, the S 2– species on the chalcopyrite surface were oxidized to hydrophobic S 0 /S n 2– , enabling the mineral to maintain its good floatability. Moreover, a descriptive model was developed to illustrate the different oxidative properties of both chalcopyrite and pyrrhotite treated with NaIO 4 . This study provides a new approach for the efficient enrichment and utilization of pyrrhotite.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Lucheng Zhang,Lu Wang,Mingqing Zhang,Tingting Wang,Gang Kang,Shilong Wu,Yi She
Cyanide has been widely used in gold extraction due to its cost-effectiveness, high selectivity and recovery. Regrettably, its wide application also leads to the presence of a large amount of thiocyanogen (SCN − ) in the tail liquid of mineral processing plants, which affects the quality of the effluent water, and thus poses a threat to the ecological environment and human health. This paper investigates the degradation of high concentration of SCN − in water using electrochemical oxidation/periodate (E-GP/PI) system. A degradation rate of 90.25 % of SCN − was achieved by optimising various operating parameters. The effects of organic matter and typical heavy metal ion concentrations on the degradation of SCN − were investigated, and it was found that Cu 2+ was able to promote the degradation of SCN − through the formation of stable complexes with SCN − , which enhanced the degradation rate to 96.48 %. However, the presence of Octadecyltrimethylammonium bromide (OTAB) and butylxanthin hindered the degradation process, where 500 mg/L of OTAB reduced the degradation rate of SCN − to 80.88 %, while 100 mg/L of butylxanthin reduced the degradation rate to 78.66 %. On this basis, experiments were carried out using real wastewater samples and SCN − degradation efficiencies of about 90 % were obtained. Afterwards, through electron paramagnetic resonance analysis, free radical burst, ion chromatograph and other research techniques, IO 3 and O 2 – were obtained as the main drivers of SCN − degradation and SCN − degradation pathways were elucidated. Finally, the E-GP/PI system was shown to be effective in reducing the ecotoxicity of SCN − by increasing the 24-h LC 50 from 12.5 % to 48.5 % in a toxicity test with daphnia . This study provides a new idea for the green and efficient treatment of SCN − rich beneficiation tail liquid.
研究领域:
环境科学
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电化学工程
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废水处理
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Mahmoud Samy,Esmail M. El-Fakharany,Kenneth Mensah,Karim Amer,Jiantao Li,Dennis Y.C. Leung
This article presents a vacuum ultraviolet (VUV)-activated periodate (PI) system for the degradation of polyethylene (PE) plastics for the first time. The study compares the performance of the VUV/PI with VUV/sulfite, VUV/peroxymonosulfate, and VUV/persulfate degradation systems. At an oxidant concentration of 5 mM, reaction time of 6 h, PE plastics concentration of 0.1 g/L, PE plastics size of 12 mm, and pH 7, VUV/PI degradation system attained a mass loss ratio of 3.9 %, which was higher than the other degradation systems. The mass loss ratio increased to 4.9 % at pH 3, and 6.8 % for a plastic size of 6 mm. The degradation mechanism was found to involve iodate radicals and singlet oxygen as the main reactive species. Prolonging reaction time to 120 h resulted in a mass loss percentage of 61.8 %. SEM, FTIR, and water contact angle analyses after the degradation show cracks on PE plastics surface, an increase of carbonyl index, and a decrease of hydrophobicity affirming the efficient oxidation of PE plastics by the generated reactive species. The main oxidation by-products were alcohols, esters, acids, and ketones. Cytotoxicity and phytotoxicity analyses confirmed the efficient oxidation of PE plastics by the generated reactive species to result in low toxicity of the generated intermediates. The proposed study presents a simple and effective degradation system that can be implemented on a wider scale as a tertiary treatment in wastewater treatment plants for the degradation of plastics before release to the ecosystem.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Jun-Hu Cheng,Xin Ai,Ji Ma,Da-Wen Sun
This study represents the inaugural investigation into the effect of cold plasma (CP) pretreatment combined with sodium periodate on the preparation of dialdehyde starch (DAS) from native maize starch and its consequent effects on the properties of DAS. The findings indicate that the maize starch underwent etching by the plasma, leading to an increase in the particle size of the starch, which in turn weakened the rigid structure of the starch and reduced its crystallinity. Concurrently, the plasma treatment induced cleavage of the starch molecular chain, resulting in a decrease in the viscosity of the starch and an enhancement of its fluidity. These alterations facilitated an increased contact area between the starch and the oxidising agent sodium periodate , thereby augmenting the efficiency of the DAS preparation reaction. Consequently, the aldehyde group content was elevated by 9.98 % compared to the conventional DAS preparation methodology. Therefore, CP could be an efficient and environmentally friendly non-thermal processing method to assist starch oxidation for DAS preparation and property enhancement.
研究领域:
食品科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Kaiting Zhang,Yi Zhang,Shuyi Xu,Félix Manuel Rosado-García,Noel Severino Pérez Duarte,Yiqun Chen,Jifei Hou,Mingbao Feng
The development of effective and selective oxidation technology in complex water matrices is crucial for water ecological security. This study reports for the first time the synergistic use of “oxidant-oxidant” about sodium percarbonate (SPC) and periodate (PI) to selectively degrade organic micropollutants. The SPC/PI system showed degradation rates of 0.0946–0.2978 min −1 for various pollutants, which was 3.7–1787 times higher than those in the PI alone and SPC alone systems and can achieve the effect of H 2 O 2 /PI systems. Additionally, SPC/PI was a safe water treatment technology without generating reactive iodine species (e.g., HOI). The slightly reduced removal rate of bisphenol F under different ionic species and strengths is indicative of the good anti-interference of the SPC/PI system. Scavenging, probe, and electron spin resonance experiments showed that ▪ OH and CO 3 ▪- played a major role in this process, rather than O 2 ▪- and 1 O 2 . Finally, the oxidized products and the possible transformation pathways of three different micropollutants in the SPC/PI and H 2 O 2 /PI systems were characterized and clarified, and the toxicity of the degradation products was predicted. Generally, the study proposed a new selective oxidation strategy of SPC/PI that can effectively eliminate micropollutants in water treatment and clarified the interaction mechanisms between PI and SPC.
研究领域:
环境科学
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水处理技术
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 29
·44732-44745
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IF 5.19
Wang Zhijie,Bao Jianguo,Du Jiangkun,Luo Liting,Xiao Guangfeng,Zhou Ting
Pollutant degradation via periodate ( \({\text{IO}}_{4}^{-}\) ) and transitional metal oxides provides an economical, energy-efficient way for chemical oxidation process in environmental remediation. However, catalytic activation of periodate by manganese dioxide and the associated mechanism were barely investigated. In this study, four MnO 2 polymorphs (α-, β-, γ- and δ-MnO 2 ) were synthesized and tested to activate \({\text{IO}}_{4}^{-}\) for the degradation of sulfamethoxazole (SMX). The reactivity of different MnO 2 structures followed the order of α-MnO 2 > β-MnO 2 > γ-MnO 2 > δ-MnO 2 , suggesting that the particular crystalline structure in α-MnO 2 would exhibit higher activities via \({\text{IO}}_{4}^{-}\) activation. Herein, in α-MnO 2 / \({\text{IO}}_{4}^{-}\) system, 91.1% of SMX was eliminated within 30 min with degradation rate constant of 0.0649 min −1 , and the neutral pH exhibited higher efficiency in SMX degradation compared with acidic and alkaline conditions. Singlet oxygen ( 1 O 2 ) was unveiled to be the dominant ROS according to the results of electron paramagnetic resonance, chemical probes and radical quenching experiments, whereas \({\mathrm{O}}_{2}^{\bullet -}\) and • OH were mainly acted as a free-radical precursor. Six oxidation products were identified by LC–MS, and the elimination of sulfonamide bond, hydroxylation and direct oxidation were found to be the important oxidation pathways. The study dedicates to the mechanistic study into periodate activation over alpha-MnO 2 and provides a novel catalytic activation for selective removal in aqueous contaminants.
研究领域:
环境科学
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化学工程
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污染控制
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yong Chen,Huiping Zeng,Jiaxin Xu,Dong Li,Jie Zhang
Currently, there are well-operated iron removal water plants in the northeast region of China. Among them, the backwash process produces a large amount of iron-containing sludge (IS) year by year, which can cause some harm to the environment if not treated. The main form of existence for IS is amorphous γ-FeOOH, and this work demonstrates that IS is a natural and highly active catalyst for periodate(PI). Moreover, IS showed strong stability in environmental factor effects and reproducibility experiments. EPR with quenching experiments proved that IS could activate PI to produce •OH, O 2 •− , 1 O 2 , and IO 3 • . In the degradation experiments where methylene blue was chosen as the model pollutant, IO 3 • , and 1 O 2 were the substances that served the prominent role in degradation. This work provides an inexpensive and feasible way to dispose of waste iron-containing sludge from water plants and provides fundamental insights into the degradation mechanism of organic pollutants through the activation of PI by IS.
研究领域:
环境科学
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化学工程
·
废水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hanyu Liu,Haoxu Ma,Junlong Liu,Zhuo Yu,Shangru Tang,Jiabin Sun,Sibo Wu,Lizhi Wang,Hongbo Xiao,Wenlei Wang,Ting Yang
Photocatalysis technology has been considered a green and efficient method to control tetracycline hydrochloride (TCH) pollution in potable water sources. In this paper, Bi 2 WO 6 -loaded photocatalysts on nitrogen-defective C 3 N 4 (BWO@ND-C 3 N 4 ) were constructed to synergistically promote the degradation of TCH under visible light by activating periodate (PI). TCH (20 mg/L) could be 100 % photo-degraded by BWO@ND-C 3 N 4 (0.25 g/L) within 30 min when PI concentration is 1 mM. The BWO@ND-C 3 N 4 /activated PI system can also complete total TCH degradation when applied to actual water bodies and sunlight particularly (40 min for sunny days and 60 min for cloudy days). Besides, the system displayed good recycling stability under visible light, maintaining 90 % TCH degradation efficiency after 6 cycles. The degradation mechanism research showed that ·IO 3 , h + , ·OH, ·O 2 – and 1 O 2 are the main active substances in the degradation process. The superior TCH degradation performances of BWO@ND-C 3 N 4 can be ascribed to the interfacial C-O bonds and the stable built-in electric field between BWO and ND-C 3 N 4 for the fast separation of photogenerated carriers and activating PI, which can facilitate the rapid electron transfer, enhancing the TCH degradation kinetics. This work provides a broad application prospect of photocatalyst/activated PI systems for antibiotic pollution treatment in water.
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Liwei Yang,Fashan Yang,Heng Zhang,Hongyu Zhou,Mengfan Luo,Yunmei Liu,Chuanliang Zhao,Lu Zheng,Bo Lai
At present, the potential mechanism of manganese oxide (MnO 2 ) activation of PI and the key active sites of PI activation are still unclear and controversial. To this end, three different crystal forms of MnO 2 were prepared in this study and used to activate PI to degrade pollutants. The results showed that different crystal types of MnO 2 showed different catalytic abilities, and the order was γ-MnO 2 > α-MnO 2 > β-MnO 2 . Through quenching experiments, EPR tests, Raman experiments and in situ electrochemical experiments, it has been confirmed that electron transfer-mediated non-free radical process is the main mechanism of pollutant degradation , in which the active substance is the highly active metastable intermediate complex (MnO 2 /PI*). Hydroxyl radical (HO • ), superoxide radical (O 2 •− ), singlet oxygen ( 1 O 2 ) and iodine radical (IO 3 • ) did not participate in pollutant degradation. The quantitative structure-activity relationship analysis confirmed that the catalytic performance of MnO 2 was highly positively correlated with the surface Mn(IV) content, which indicated that the surface Mn(IV) site was the main active site. Overall, this study will be of great help to the design and application of manganese dioxide activation for periodate degradation of pollutants.
研究领域:
环境科学
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材料化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）