APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hongbo Lu,Chunli Wang,Xueming Liu,Jing Zhang,Zhang Lin,Zhengping Hao,Gang Pan
Arsenic sulfide sludge (ASS) is a typical precipitation product of acid smelting wastewater. Previous study reported that when exposed to sunlight, the release and oxidation of As(III) in ASS were markedly accelerated. However, the key factor to trigger the photocatalytic transformation of ASS is still unclear. Herein, we revealed that the coexisting Fe(II)/Fe(III) ions were critical to promote the photo-oxidation of released As(III) under visible light. We further validated that Fe(II)-stimulated photo-oxidation mechanism of As(III) in ASS was pH-dependent. In acid conditions, OH and SO 4 − were promoted by Fe(II)/Fe(III) cycling catalysis with the assistance of the reductive sulfur species from ASS, e.g. S 2− and SO 3 2− , and thus accelerated the oxidation of As(III). While in neutral conditions, the nascent ferric hydroxide colloids enhanced the oxidation rate of As(III) via photo-induced ligand-to-metal-charge transfer (LMCT) mechanism. These findings help in predicting and controlling the fate of real arsenic-containing sludge in sunlit environments.
研究领域:
环境科学
·
化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 3
·623-628
·
IF 1.307
Zong Siyu,Wang Bolun,Ma Wenyan,Yan Yan,Li Jiyang
A facile method was developed to prepare carbon dots(CDs) by pyrolysis and etching of coffee residue. The as-prepared CDs show uniform spherical nanoparticles with an average size of 2.3 nm and exhibit excitation-dependent fluorescence emissions. Moreover, CDs also exhibit strong fluorescence quenching to nitro compounds and metal ions in both water and ethanol solutions, which could act as a platform for dual detection of PA(picric acid) and Fe 3+ ions with low detection limits of 0.26 and 0.83 µmol/L, respectively. This work provides a novel method for preparation of environmental-friendly fluorescent CDs and shows their potential applications in photoluminescence sensors.
研究领域:
材料科学
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环境科学
·
分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xin Liu,Peng Xu,Qi Fu,Runhan Li,Chenxi He,Wenxuan Yao,Lei Wang,Shiqi Xie,Zhiyi Xie,Jingwei Ma,Qiulai He,John C. Crittenden
Zero-valent copper activated peroxymonosulfate (ZVC/PMS) system was widely used to degrade refractory contaminants due to being highly effective. However, the low reactivity and easy dismutation of cuprous species (Cu(I)) in acid condition limited its efficiency. In our study, ZVC coupled with ferrous ion (Fe(II)) promoted PMS to degrade orange II. Multiple oxidants including Cu(III), OH and SO 4 − made main contribution on orange II degradation in the Fe(II)/ZVC/PMS system. In the Fe(II)/ZVC/PMS system, ZVC generated Cu(I) by H + corrosion and PMS oxidation, and Cu(I) reacted with oxygen producing hydrogen peroxide. Then, Fe(II) and Cu(I) catalyzed hydrogen peroxide and PMS to generate Cu(III), OH and SO 4 − , and thereinto Fe(III) was reduced to Fe(II) by ZVC and Cu(I). In the Fe(II)/ZVC/PMS system, water matrix including humic acid, sulfate and nitrate had no significant impact on orange II degradation, while chloride restrained the degradation of orange II. The Fe(II)/ZVC/PMS system exhibited great degradation for orange II in tap water, lake water and well water. Additionally, the Fe(II)/ZVC/PMS system degraded more than 90% of methyl orange, rhodamine B, acetaminophen, ibuprofen, propranolol and diclofenac. Through adjusting the final reaction solution to pH 8.5 and subsiding, the discharge of total copper met the II-level environmental quality standards for surface water in China (1 mg/L). Hence, the study provided a promising method to induce PMS for enhanced degradation of contaminants.
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
Minerals
·
2021
·Vol. 11
·期 6
·599
·
IF 2.644
Yanping Niu,Ya Li,Haoran Sun,Chuanyao Sun,Wanzhong Yin,Hongfeng Xu
Ferric ions produced during grinding influence the flotation separation between kyanite and quartz adversely. In this study, citric acid was used as a regulator to eliminate the effect of ferric ions on the separation of kyanite from quartz with sodium oleate (NaOL) as a collector. The microflotation test results indicated that the quartz was selectively activated by FeCl3and maintained significant quartz recovery. However, the citric acid could selectively eliminate the effect of ferric ions on the quartz and minimally influenced the kyanite. Contact angle tests demonstrated that FeCl3significantly increased the interaction between NaOL and quartz, resulting in the high hydrophobicity of quartz, and the addition of citric acid made the quartz surface hydrophilic again but slightly influenced the kyanite. Fourier-transform infrared spectroscopy showed that FeCl3facilitated NaOL adsorption onto the quartz surface, and the addition of citric acid eliminated the activation of FeCl3on the quartz, resulting in the nonadsorption of NaOL onto the quartz surface. However, the FeCl3and citric acid exhibited a negligible effect on NaOL adsorption onto the kyanite surface. X-ray photoelectron spectroscopy analysis indicated that the citric acid eliminated FeCl3activation on the quartz.Keywords:kyanite;quartz;citric acid;ferric ion;selective elimination
研究领域:
矿物学
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浮选化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
·
IF 4.097
Jing Yu,Na Song,Ya-Kun Zhang,Shu-Xian Zhong,Ai-Jun Wang,Jianrong Chen
Green, low-cost, and water-soluble fluorescent carbon dots were prepared under hydrothermal conditions, with a plant of Jinhua bergamot as a carbon source. The as-synthesized C-dots have better stability and relatively high photoluminescence with a quantum yield of 50.78%, along with the fluorescence lifetime of ca. 3.84 ns. Their photoluminescence can be significantly quenched by simply using the buffer solution of HAC–NaAC for Hg 2+ and Tris–HCl for Fe 3+ . Based on this, we explored for selective detection of Hg 2+ and Fe 3+ with high selectivity, fast response, low cost, and broad linear ranges of 0.01–100 μM for Hg 2+ and 0.025–100 μM for Fe 3+ , as well as low detection limits of 5.5 nM (Hg 2+ ) and 0.075 μM (Fe 3+ ) (S/N = 3).
研究领域:
化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 23
·2101605
·
IF 6.147
Shuai Chen,Yong Yan,Yue Yu,Zhenfeng Wang,Xiaojun Zhu,Liping Sun,Chao Li,Feng Wang
Pathogenic bacteria and biofilm formation have become the urgent threats to global public health. Herein, metal-epigallocatechin gallate (EGCG) network with improved bactericidal effect and pathogenic biofilm eradication ability via trivalent cationic Fe 3+ catalyzed hydrogen peroxide (H 2 O 2 ) decomposition is developed. EGCG, the predominant catechin from tea, is predicted to be a good chelator for eight metal ions (i.e., Al 3+ , Cr 3+ , Cu 2+ , Co 2+ , Zn 2+ , Mn 2+ , Ni 2+ , Fe 3+ ). 3,3',5,5'-tetramethylbenzidine oxidation experiment using UV–vis spectrometer demonstrated that Zn 2+ , Mn 2+ , Ni 2+ are the potential candidates to accelerate the generation of H 2 O 2 by EGCG. Compared with the other two metal-EGCG network (Zn 2+ -EGCG or Mn 2+ -EGCG), only Ni 2+ -EGCG network has better bactericidal property and plays a synergistic role in the network system. Furthermore, by introducing Fe 3+ to Ni 2+ -EGCG network, the complex exhibits the best bactericidal property for gram-negative bacteria Escherichia coli ( E. coli ) and Pseudomonas aeruginosa (PAO1), which can be explained by the rapid H 2 O 2 decomposition and associated production of hydroxyl radicals. With SYTO 9/PI staining assay, Fe 3+ as a catalytic mediator in Ni 2+ -EGCG network shows the most significant bactericidal effect and pathogenic biofilm eradication ability. According to the above analysis, Ni 2+ -EGCG network presents a promising nanoplatform as an alternative to antibiotics for eradication of pathogenic bacteria and biofilms.
研究领域:
微生物学
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材料科学
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医学
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DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Wen Zhang,Zhi-Yi Yang,Ren-Cheng Tang,Jin-Ping Guan,Yi-Fan Qiao
Traditional flame retardants (FRs) for textiles are limited by toxicity, environmental persistence and bioaccumulation. There is an urgent need to develop environmentally benign FRs. For this purpose, the combination of tannic acid (TA, a specific form of hydrolysable tannin) and ferrous ion was applied to simultaneously impart durable FR and antibacterial functions to silk fabric. A ternary TA-ferrous ion-silk complex was fabricated by adsorption of TA on silk followed by mordanting with ferrous salt. After treated with 20% TA (on the weight of fabric) and 2 g/L ferrous sulfate, silk fabric exhibited an obvious increase in limiting oxygen index from 23.6% to 27.5%, a significant decrease in damaged length from 30.0 to 11.2 cm after vertical burning, and a significant increase in antibacterial rate from 22% to 95%. Even after 20 washes, the treated fabric still had the same FR ability as the unwashed one, and an antibacterial rate of above 90%, exhibiting excellent washing durability. The high thermal stability of the treated fabric in nitrogen indicated the formation of a ternary TA-ferrous ion-silk complex which was responsible for excellent washing durability. The observation on the morphological structure of charred products from vertical burning revealed the good charring capability of the treated fabric which contributed to enhanced FR behavior. This research proposes an eco-friendly FR treatment for silk and a novel application of hydrolysable tannins in the FR modification of textiles.
研究领域:
材料科学
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纺织工程
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环境科学
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DOI
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 33
·4130-4138
·
IF 2.596
Jingzhou Hou,Xianfeng Wang,Shiyu Lan,Chao Zhang,Changjun Hou,Qiang He,Danqun Huo
Carbon dots (CDs) having low cost and low toxicity and synthesized via a green route were applied to establish a fluorescent nanoprobe for the measurement of glyphosate. The synthesis was realized via a one-pot hydrothermal procedure using Sophora japonica leaves as the carbon source. It was found that electron transfer occurred between Fe3+ and the as-prepared CDs. Therefore, Fe3+ exhibited a specific dynamic-quenching toward CDs. However, the electron transfer process was inhibited by glyphosate. The fluorescence of the quenched CDs/Fe3+ system was recovered by the addition of glyphosate. It resulted from the strong complexation between Fe3+ and the functional groups (like –PO3H2 and –COOH) in the glyphosate molecule. These functional groups captured Fe3+ from the CD/Fe3+ system to reduce the electron transfer. With such a design, the rapid detection of glyphosate could be realized by this turn-on fluorescent sensor based on the CD/Fe3+ system. Under optimal conditions, the CD/Fe3+ system showed a concentration-dependent fluorescent response toward glyphosate in the linear range from 0.1 to 16 ppm. The limit of detection was calculated to be as low as 8.75 ppb (3σ/S). In addition, the successful detection of glyphosate in real samples with satisfactory recoveries exhibited a practical application of the CD/Fe3+ nanoprobe in food safety and environmental monitoring.
研究领域:
分析化学
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环境科学
·
食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ning Chen,Mengyuan Geng,Danyu Huang,Mengxi Tan,Zipeng Li,Guangxia Liu,Changyin Zhu,Guodong Fang,Dongmei Zhou
Many studies have examined the redox behavior of ferrous ions (Fe(II)) sorbed to mineral surfaces. However, the associated hydroxyl radical ( • OH) formation during Fe(II) oxidation by O 2 was rarely investigated at circumneutral pH. Therefore, we examined • OH formation during oxygenation of adsorbed Fe(II) (Fe(II) sorbed ) on common minerals. Results showed that 16.7 ± 0.4–25.6 ± 0.3 μM of • OH was produced in Fe(II) and α/γ -Al 2 O 3 systems after oxidation of 24 h, much more than in systems with dissolved Fe(II) (Fe 2+ aq ) alone (10.3 ± 0.1 μM). However, • OH production in Fe(II) and α -FeOOH/ α -Fe 2 O 3 systems (6.9 ± 0.1–8.3 ± 0.1 μM) slightly decreased compared to Fe 2+ aq only. Further analyses showed that enhanced oxidation of Fe(II) sorbed was responsible for the increased • OH production in the Fe(II)/Al 2 O 3 systems. In comparison, less Fe(II) was oxidized in the α -FeOOH/ α -Fe 2 O 3 systems, which was probably ascribed to the quick electron-transfer between Fe(II) sorbed and Fe(III) lattice due to their semiconductor properties and induced formation of high-crystalline Fe(II) phases that hindered Fe(II) oxidation and • OH formation. The types of minerals and solution pH strongly affected Fe(II) oxidation and • OH production, which consequently impacted phenol degradation. This study highlights that the properties of minerals exert great impacts on surface-Fe(II) oxidation and • OH production during water/soil redox fluctuations.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Zhihui Qin,Weiwei Su,Ping Liu,Jinming Ma,Yaru Zhang,Tifeng Jiao
Iron ions play an important role in our lives. Excessive or lack of iron ion intake leads to many diseases. At the same time, the water environment is easily polluted by these metal ions with the acceleration of industrialization. Therefore, the detection of iron ions in the water environment and the human body is particularly important. In this paper, we prepared a RhB-EDA fluorescent probe by condensing rhodamine B (RhB) with ethylenediamine (EDA) for high recognition of Fe3+. A RhB-EDA molecule itself is colorless and has no fluorescence emission in an alcohol solution. When Fe3+ was added, the lactam ring structure of the fluorescent probe opened, and the UV and fluorescence spectra changed. At the same time, the color of the mixed solution gradually deepened toward pink. Therefore, dual spectral detection and naked-eye observation of Fe3+ were realized. In addition, with the decrease of the pH value and the prolongation of chelating time, the ultraviolet absorbance and fluorescence emission intensity were enhanced and the color of the mixed solution deepened. The RhD-EDA fluorescent probe is simple and accurate and provides good technical support for the detection of Fe3+.
研究领域:
分析化学
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环境科学
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生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2023
·
IF 2.5
Chenchen Ma,Zihan Ma,Ziyuan He,Xianjian Wang,Longhao Zhao,Xuegang Chen
Novel hydrophilic polymers consisting of fluorene modified by alkoxyl chain were designed and synthesized via radical polymerization from acrylic acid (PAAF) or acrylamide (PAMF) in the presence of azobisisobutyronitrile. All of these polymers were good water-soluble. The photophysical behaviors of the polymers and the selectivity and sensitivity to detection metal ions were studied by UV-visible and fluorescence spectroscopy technique, and some color changes were visible to the naked eye appeared. The PAMF fluorescent probe showed good selectivity and sensitivity to detection Fe3+ (2.4 × 10−7 mol/L) and PAAF exhibited good selectivity and sensitivity to detection Fe2+ (1.5 × 10−6 mol/L) and Cu2+ (5 × 10−7 mol/L) in water.
研究领域:
高分子化学
·
分析化学
·
材料科学
·
传感技术
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荧光光谱学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 2
·e202303816
·
IF 1.9
Qingqing Hu,Jianhua Kuang,Jingxue Yuan,Yao Feng,Zhengjun Cheng
Graphical Citric acid (CA) and N-[3-(trimethoxysilyl)propyl]ethylenediamine (TPED) were dissolved in formamide to prepare carbon dots (CDs) by a microwave-assisted method. The obtained CDs were further modified with 3,5-dichloro-2-hydroxybenzaldehyde. The modified CDs (G-CDs) showed a new emission peak at 520 nm and a weaker emission peak at 450 nm; thus, a new ratiomeric fluorescence (RF) probe was obtained. The RF probe could be used for sensitively and selectively monitoring of amaranth AM and Fe 3+ . In this work, a new carbon quantum dots (CDs) was prepared though microwave assisted approach using citric acid anhydrous (CA) and N-[3-(Trimethoxysilyl)propyl] ethylenediamine (TPED) as raw materials. However, the CDs was not effective in actual sensing applications, so further modification of CDs was done by 3,5-Dichloro-2-hydroxybenzaldehyde (it was named as G-CDs). Fortunately, the modified CDs (G-CDs) has good selectivity for Fe 3+ and amaranth. Studies confirmed that Fe 3+ could quench the fluorescence of G-CDs by forming a complex, while the fluorescence quenching mechanism of G-CDs by amaranth (AM) mainly belonged to the internal filtering effect (IFE). A detection limit of 20.8 nM for Fe 3+ and 43.8 nM for AM were achieved. Moreover, the as-developed G-CDs probe was also successfully used to detect Fe 3+ and amaranth in real samples, and compared with their results by the standard method, hinting that the accuracy and reliability of the probe were highly satisfactory.
研究领域:
食品科学
·
分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）