SEPARATION AND PURIFICATION TECHNOLOGY
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2013
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IF 2.894
Heng Lin,Jie Wu,Hui Zhang
The removal of bisphenol A (BPA) by a novel “electro/Fe 3+ /peroxydisulfate” process is reported in this study. The effects of initial pH, electrolyte concentration, Fe 3+ concentration, peroxydisulfate (PDS) concentration and current density were investigated. The results indicated that the removal efficiency of BPA declined with the increase of initial pH and electrolyte concentration, but increased with an increase of Fe 3+ concentration and current density. The BPA degradation efficiency was improved significantly when the PDS concentration was increased from 1 to 10 mM, but further PDS increase had little effect. BPA was almost completely removed after 60 min reaction and a TOC removal efficiency of 94.3% was achieved when the reaction time was extended to 120 min.
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
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Longshi Rao,Yong Tang,Zongtao Li,Xinrui Ding,Guanwei Liang,Hanguang Lu,Caiman Yan,Kairui Tang,Binhai Yu
Rapidly obtaining strong photoluminescence (PL) of carbon dots with high stability is crucial in all practical applications of carbon dots, such as cell imaging and biological detection. In this study, we proposed a rapid, continuous carbon dots synthesis technique by using a microreactor method. By taking advantage of the microreactor, we were able to rapidly synthesized CDs at a large scale in less than 5 min, and a high quantum yield of 60.1% was achieved. This method is faster and more efficient than most of the previously reported methods. To explore the relationship between the microreactor structure and CDs PL properties, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were carried out. The results show the surface functional groups and element contents influence the PL emission. Subsequent ion detection experiments indicated that CDs are very suitable for use as nanoprobes for Fe 3 + ion detection, and the lowest detection limit for Fe 3 + is 0.239 μM, which is superior to many other research studies. This rapid and simple synthesis method will not only aid the development of the quantum dots industrialization but also provide a powerful and portable tool for the rapid and continuous online synthesis of quantum dots supporting their application in cell imaging and safety detection.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2013
·
IF 5.257
Peng Liao,Songhu Yuan,Mingjie Chen,Man Tong,Wenjing Xie,Peng Zhang
A novel Pd-based electro-Fenton (E-Fenton) process has recently been developed to transform organic contaminants in groundwater. However, it only produces H2O2 and requires addition of Fe2+. In this study, an innovative approach is developed to effectively regulate the generation of Fe2+ from an iron cathode in a three-electrode system in addition to H2O2 production. The Fe2+ is then used for the Pd-catalytic transformation of methyl tert-butyl ether (MTBE) in groundwater. Results from batch experiments suggest Fe2+ accumulation follows pseudo-first-order kinetics with rate quantitatively regulated by current and pH, and MTBE can be completely transformed. In a specially configured three-electrode column using iron as the first cathode, the localized acidic conditions develop automatically in the iron cathode and Pd zone by partitioning the current between the two cathodes, leading to controllable generation of Fe2+ and H2O2. Effects of electrolyte concentrations and types as well as humic acid on MTBE transformation are slight. The stable transformation (∼70%) in a long-term study (20 days) suggests this improved Pd-based E-Fenton process is sustainable to produce Fe2+, H2O2, and appropriate pH conditions simultaneously for transforming organic contaminants. This study presents a new concept of generating Fe2+ from an iron cathode for the processes requiring Fe2+.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Juan Liu,Jingping Zhong,Zhiwen Chen,Jinshui Mao,Jun Liu,Zhenyu Zhang,Xiaocheng Li,Sili Ren
Attapulgite (AT) nanorods are generally regarded as one-dimensional materials and have been widely used in many fields. Two-dimensional (2D) AT nanomaterials have remained quite rare due to the difficulty of assembling from one-dimensional nanorods. Herein, we have prepared a novel type of single-layered 2D palmate AT nanosheets (AT-NS) with uniform size by a solvothermal synthesis process. The morphology and structure of the obtained 2D nanosheets were characterized by SEM, TEM, AFM, XRD, FTIR, and XPS. It was found that the AT nanosheets have a mean thickness in the range of 30–50 nm, and the length and width are in the range of 30 nm-2 μm. The structure evolution from AT nanorods to nanosheets were systematically studied and revealed. It was shown that the amination of AT and the introduction of trivalent iron ions (Fe 3+ ) ions into the AT materials play key roles in the formation of AT-NS. The AT nanorods are connected each other by the AT-NH 2 groups coupling with the Fe 3+ ions on the AT surface. More importantly, the Fe 3+ substitute the Al 3+ , Mg 2+ in AT mainly along the (1 1 0) planes. Therefore, the coordination of trivalent iron ions with amino groups occurs on the AT (1 1 0) plane. As a result, multiple nanorods are connected side by side to form the 2D nanosheets in a palmate shape. It is believed that the special morphology and structure of the 2D AT-NS material may bring some outstanding performance, which makes it have potential important application such as the demulsification of crude oil-in-water emulsion. In addition, the confined 2D assembling methodology offers us a new way to design and prepare novel materials with 2D structure.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Jinzhao Wang,Di Huang,Fengxia Chen,Jianhua Chen,Hongyu Jiang,Yifan Zhu,Chuncheng Chen,Jincai Zhao
Fe(III) and carboxylic acids are common compositions in atmospheric microdroplet systems like clouds, fogs, and aerosols. Although photochemical processes of Fe(III)–carboxylate complexes have been extensively studied in bulk aqueous solution, relevant information on the dynamic microdroplet system, which may be largely different from the bulk phase, is rare. With the help of the custom-made ultrasonic-based dynamic microdroplet photochemical system, this study examines the photochemical process of Fe(III)–citric acid complexes in microdroplets for the first time. We find that when the degradation extent of citric acid is similar between the microdroplet system and the bulk solution, the significantly lower Fe(II) ratio is present in microdroplet samples due to the rapider reoxidation of photogenerated Fe(II). However, by replacing citric acid with benzoic acid, no much difference in the Fe(II) ratio between microdroplets and bulk solution is observed, which indicates distinct reoxidation pathways of Fe(II). Moreover, the presence of •OH scavenger, namely, methanol, greatly accelerates the reoxidation of photogenerated Fe(II) in both citric acid and benzoic acid situations. Further experiments reveal that the high availability of O2 and the citric acid- or methanol-derived carbon-centered radicals are responsible for the rapider reoxidation of Fe(II) in iron–citric acid microdroplets by prolonging the length of HO2•- and H2O2-involved radical reaction chains. The results in this study may provide a new understanding about iron–citric acid photochemistry in atmospheric liquid particles, which can further influence the photoactivity of particles and the formation of secondary organic aerosols.
研究领域:
大气科学
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环境化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
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2022
·Vol. 14
·期 38
·3727-3738
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IF 3.532
Chao Huang,Hongwei Wang,Yunjia Xu,Shujuan Ma,Bolin Gong,Junjie Ou
Heavy metal pollution has spread around the world with the development of industry, posing a major threat to human health. It is urgent to design and fabricate bifunctional materials for detection and adsorption of heavy metal ions. Herein, poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) microspheres, a kind of common macroporous adsorption resin (MAR), were employed as the matrix, and carbon dots (CDs) with excellent optical properties were grafted onto the surface of MAR by surface-initiated atom transfer radical polymerization (SI-ATRP) and photo-initiated “thiol-yne” click chemistry. The synthesized MAR@poly(PA)@CD could produce fluorescence quenching with Fe3+. A simple fluorescence spectrometric method for detection of Fe3+ was established. The fluorescence intensity of MAR@poly(PA)@CD decreased linearly with the concentration of Fe3+ in the range of 0–70 nmol L−1, with a limit of detection (LOD) of 6.6 nmol L−1, which had the potential for trace detection. In addition, after SI-ATRP modification, many adsorption sites were generated on the surface of MAR, and the adsorption capacity for Fe3+ was 23.8 mg g−1. Isothermal and kinetic adsorption experiments were more consistent with the Langmuir model (r = 0.9992) and pseudo-second-order model (r = 0.9902), indicating that the adsorption was monolayer adsorption and chemical adsorption, respectively. MAR@poly(PA)@CD with dual functions of detecting and adsorbing Fe3+ was successfully prepared, showing great application prospects in the environmental field.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
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2023
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IF 12.8
Chaoyun Ying,Chang Liu,Feng Zhang,Lirong Zheng,Xiaoming Wang,Hui Yin,Wenfeng Tan,Xionghan Feng,Bruno Lanson
Manganese (Mn) oxides are extensively used to oxidize As(III) present in ground, drinking, and waste waters to the less toxic and more easily removable As(V). The common presence of multiple other cations in natural waters, and more especially of redox-sensitive ones such as Fe 2+ , may however significantly hamper As(III) oxidation and its subsequent removal. The present work investigates experimentally the influence of Mn(III) chelating agents on As(III) oxidation process in such environmentally relevant complex systems. Specifically, the influence of sodium pyrophosphate (PP), an efficient Mn(III) chelating agent, on As(III) oxidation by birnessite in the presence of Fe(II) was investigated using batch experiments at circum-neutral pH. In the absence of PP, competitive oxidation of Fe(II) and As(III) leads to Mn oxide surface passivation by Fe(III) and Mn(II/III) (oxyhydr)oxides, thus inhibiting As(III) oxidation. Addition of PP to the system highly enhances As(III) oxidation by birnessite even in the presence of Fe(II). PP presence prevents passivation of Mn oxide surfaces keeping As and Fe species in solution while lower valence Mn species are released to solution. In addition, reactive oxygen species (ROS), tentatively identified as hydroxyl radicals (•OH), are generated under aerobic conditions through oxygen activation by Fe(II)–PP complexes, enhancing As(III) oxidation further. The positive influence of Mn(III) chelating agents on As(III) oxidation most likely not only depend on their affinity for Mn(III) but also on their ability to promote formation of these active radical species. Finally, removal of As(V) through sorption to Fe (oxyhydr)oxides is efficient even in the presence of significant concentrations of PP, and addition of such Mn(III) chelating agents thus appears as an efficient way to enhance the oxidizing activity of birnessite in large-scale treatment for arsenic detoxification of groundwaters.
研究领域:
环境科学
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化学
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水处理工程
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yixin Huang,Jing Zou,Jiawen Li,Hongfang Ma,Siying Chen,Lingying Chen,Xiaobin Liao,Jun Ma
In this study, a rapid, sensitive and reliable spectrophotometric method for peroxydisulfate (PDS) determination in water was established. The proposed spectrophotometric method was based on the oxidation of 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonate) (ABTS) to form stable and green-colored ABTS radical (ABTS • + ) by ferrous ion (Fe(II))-catalyzed PDS. The formed ABTS • + performed well linear relationship with PDS concentration (R 2 > 0.999) in the range of 0–60 μM at four wavelengths of 415, 650, 732, and 820 nm under optimized conditions. The proposed Fe(II)-ABTS spectrophotometric method was highly sensitive with the absorptivity of 3.595 × 10 4 M −1 cm −1 , 1.530 × 10 4 M −1 cm −1 , 1.945 × 10 4 M −1 cm −1 and 1.768 × 10 4 M −1 cm −1 at four detection peaks of 415, 650, 732 and 820 nm, respectively. Additionally, the proposed Fe(II)-ABTS spectrophotometric method possessed well anti-interference capacity to common natural water constituents and was reliable to determine PDS concentration in water. What’s more, the proposed Fe(II)-ABTS spectrophotometric method was successfully applied in monitoring the change of PDS concentration during the degradation of diclofenac in heat-activated PDS process. In a word, the proposed Fe(II)-ABTS spectrophotometric method could be employed as a promising approach for the rapid and accurate measurement of PDS in water, and this study provided a new perspective for the measurement of PDS by the visible spectrophotometry .
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2023
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IF 2.7
Shang Xuefang,Liu Bingqing,Liu Lixia,Wang Jia,Wang Yingling
In order to better monitor the content of Fe 3+ and H 2 S in the biological environment, two new fluorescent probes were designed and synthesized. With the addition of Fe 3+ , the strong fluorescence emission of two probes was significantly quenched due to the paramagnetic effect of Fe 3+ . With the further addition of S 2− , the fluorescence intensity was quickly restored. Two probes showed high selectivity and strong sensitivity for the detection of Fe 3+ and S 2− , and the fluorescence intensity “ON-OFF-ON” was accompanied with the interaction process. At the same time, two probes displayed good anti-interference ability which was not interfered by the existence of other ions. In addition, two probes illustrated fast response time to Fe 3+ , S 2− and small cytotoxicity to cells. Therefore, two probes can provide a potential ideal tool for detecting Fe 3+ and H 2 S in organisms and the environment.
研究领域:
生物化学
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分析化学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Mingda Che,Xianfeng Wang,Mei Cui,Renliang Huang,Wei Qi,Rongxin Su
The frequent outbreaks of Phaeocystis globosa ( P. globosa ) blooms in coastal areas have seriously threatened nuclear power safety. In this study, tannic acid (TA) was used to accelerate the removal of P. globosa from seawater by Fe (Ⅱ) activated persulfate (PS). In comparison with the Fe (Ⅱ)-PS system, the higher removal efficiency of P. globosa was obtained in the TA-Fe (Ⅱ)-PS system (91.2% vs 67.5%). The removal efficiency of fluorescence value, chlorophyll a, turbidity and total organic carbon (TOC) reached up to 90.1%, 91.2%, 61.8% and 51.6% with the addition of 10 mg L −1 of TA, 100 mg L −1 of Fe (Ⅱ) and 240 mg L −1 of PS in 420 min. The flocs images confirmed that TA played a dual role in regulating Fe (Ⅱ) concentration and activating PS, which facilitated the pre-oxidation of algae cells. Finally, the inactivated P. globosa settled to the bottom with the iron mineral flocs. In addition, positive environmental impacts were also validated due to the decrease in total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD). The findings demonstrated that TA-Fe (Ⅱ)-PS system is a promising candidate for the removal of P. globosa from seawater.
研究领域:
海洋生物学
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环境科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Zhihao Shen,Shuming Wen,Yongchao Miao,Han Wang,Qicheng Feng
Unavoidable metal ions commonly exist in the pulp during flotation. These ions can affect the floatability of minerals, and they can also result in the differences in the surface features between different minerals. In this study, how Fe 3+ affected the flotation behavior of cerussite was investigated by micro-flotation tests. The corresponding adsorption characteristics of the sulfidizing agent and collector on the surfaces of cerussite were investigated by surface-analysis techniques. The results of micro-flotation tests showed that the floatability of cerussite significantly decreased when Fe 3+ was added before Na 2 S and xanthate. The flotation recovery of cerussite decreased compared with that obtained without participation of Fe 3+ . Additionally, the results of xanthate and Na 2 S adsorption tests, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and zeta potential measurements verified that Fe 3+ and its hydrophilic hydroxyl derivatives (Fe-OH compounds) resulted in reduced amounts and reactive activities of S-bearing species adsorbed on the surfaces of cerussite. This decreased the adsorption capacity of subsequently added xanthate, resulting in the difficulty in effectively recovering cerussite in the sulfidization-xanthate system.
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
Environmental Science-Water Research & Technology
·
2021
·Vol. 7
·期 3
·630-637
·
IF 4.251
Shixiang Wang,Zhuo Chen,Zhenran Wang,Yongsheng Fu,Yiqing Liu
UV/Fe2+/peracetic acid (PAA) as an efficient and novel advanced oxidation system was reported to produce reactive species (i.e., hydroxyl radicals (˙OH) and organic radicals) for triclosan (TCS) degradation, which is a representative of pharmaceutical and personal care products (PPCPs). The effects of initial pH, PAA dosage and common water matrix on TCS degradation were investigated. The results indicated that 1 μmol L−1 TCS was completely removed within 10 min at an optimum initial pH of 3.5, Fe2+ dosage of 10 μmol L−1, PAA dosage of 1 mmol L−1 and temperature of 25 °C. The presence of HCO3− and natural organic matter (NOM) showed obviously negative effect on TCS degradation, while NO3− strongly promoted the destruction of TCS. According to the detected nine reaction products, the probable degradation pathways of TCS by UV/Fe2+/PAA were proposed including ether bond cleavage, hydroxylation, dechlorination, dechlorination–hydroxylation and dehydrogenation.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）