SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qifang Zheng,Liuyang Dong,Peilun Shen,Dianwen Liu
Citric acid (CA) exhibits weak inhibitory on some oxidized gangue minerals owing to its relatively few hydrophilic polar groups ( OH and COOH). This study investigate the synergistic mechanism of ferrous ions (Fe 2+ ) to enhance both the selective adsorption capacity and stability of CA. The separation of scheelite and cassiterite through a flotation process was successfully achieved using a Fe 2+ /CA mixed depressant. Micro-flotation test results revealed that with the addition of Fe 2+ /CA, 84.60 % of scheelite and 23.64 % of cassiterite were recovered in the foam concentrate, with grades of 66.26 % and 17.73 %, respectively. Fe 2+ /CA had a strong depressing effect on cassiterite, resulting in a 69.30 % decrease in its recovery and a 20.33 % decrease in its grade. This indicates the effective separation of scheelite from cassiterite. Fe 2+ /CA exhibited a high adsorption affinity for the cassiterite surface, which mainly comprised L 3– , Fe 2+ , and FeOH + components. Additionally, the FeOH + complex, formed from the pre-reaction between Fe 2+ and CA, exhibited significant chemical adsorption at the Sn active sites, thereby depressing cassiterite. The high-intensity adsorption peaks at cracks and the significant increase in the normalized intensity of FeOH + on the cassiterite surface indicated that the FeOH + complex had stronger adsorption on cassiterite and selectively depressed cassiterite. This enhanced both the selective adsorption capacity and stability of CA on the cassiterite surface. The Fe 2+ /CA mixed depressant achieved efficient flotation separation of scheelite and cassiterite.
研究领域:
矿物加工工程
·
表面化学
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产品关联
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
·
化学工程
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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
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
·
化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
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
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
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 139
·期 2
·999-1006
·
IF 2.471
Xie Xing-Hua,Feng Yu-Qing,Liu Shang-Hao,Zhu Jing
Emulsion explosives (EE) are one of a typical industrial explosive that is widely used in engineering and mining applications due to its high detonation performance and ideal safety characteristics. However, since an EE is a multicomponent mixture with an oil-in-water structure, the presence of some substances or impurities can reduce the safety of the EE and cause accidents. We investigated the influence of ferrous ion on the thermal behavior and stability of EE during production and storage. The thermogravimetry–differential scanning calorimetry and water solubility method were selected for the assessment of thermal behavior and stability of the EE. According to kinetic parameters, the apparent activation energy ( E a ) of the EE and the EE with ferrous ion additives was determined. The results indicated that ferrous ion could decrease the thermal decomposition temperature and E a of EE. Moreover, the degree of crystallization of ammonium nitrate increases as storage time and ferrous ion content increases. It is of important significance to reduce the hazards of the EE and to improve both safety and stability during production and storage.
研究领域:
化学工程
·
安全科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Hejie Qin,Daqiang Yin,Joel Z. Bandstra,Yuankui Sun,Guomin Cao,Xiaohong Guan
In this study, Fe 2+ addition was employed to overcome the negative effects of humic acid (HA) on contaminant removal by zerovalent iron (ZVI), and its feasibility to improve electron efficiency of ZVI was also tested. HA at high concentrations suppressed the removal of 4-nitrophenol (4-NP) by ZVI, while the addition of 0.25–1.0 mM Fe 2+ could greatly mitigate this inhibitory effect and enhance 4-NP reduction. Specifically, with a mixed-order model, global fitting results showed that the addition of Fe 2+ increased the rate constant from 0.124 × 10 −2 –0.219 × 10 −2 mM/min to 0.227 × 10 −2 –0.417 × 10 −2 mM/min and shortened lag period from 19.7–47.9 min to 8.0–15.2 min for 4-NP removal. The mechanistic investigation revealed this trend could be explained by the following aspects: i ) Fe 2+ can facilitate the generation of Fe(II)-containing oxides, which can act as an electron mediator or direct electron donor for 4-NP reduction; ii ) the presence of Fe 2+ could lead to aggregation of HA particles and accordingly reduced its coverage on ZVI surface. But the results of respike experiments indicate that Fe 2+ addition did not show remarkable effect on the electron efficiency of 4-NP by ZVI, which should be associated with that Fe 2+ was not able to favor the enrichment of 4-NP on ZVI surface.
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
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
·
废水处理
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DOI
PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 14
·4255
·
IF 4.412
Ying Gao,Jie-Qiong Wang,Jian-Xin Chen,Fang Wang,Gen-Sheng Chen,Jun-Feng Yin,Yong-Quan Xu
Aroma deterioration is one of the biggest problems in processing tea beverages. The aroma of tea infusion deteriorates fast during heat sterilization and the presence of ferrous ion (Fe2+) aggravates it. The underlying mechanism remains unveiled. In this study, Fe2+was verified to deteriorate the aroma quality of green tea infusion with heat treatment. Catechins were necessary for Fe2+-mediated aroma deterioration. By enhancing the degradation of catechins, Fe2+dramatically increased the production of hydrogen peroxide (H2O2). Fe2+and H2O2together exacerbated the aroma of green tea infusion with heat treatment. GC-MS analysis revealed that the presence of Fe2+enhanced the loss of green/grassy volatiles and promoted the formation of new volatiles with diversified aroma characteristics, resulting in a dull scent of green tea infusion. Our results revealed how Fe2+induced aroma deterioration of green tea infusion with heat treatment and could help guide tea producers in attenuating the aroma deterioration of tea infusion during processing.Keywords:green tea infusion;aroma deterioration;ferrous ion;catechins;hydrogen peroxide
研究领域:
食品科学
·
植物化学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Qinbo Cao,Yan Yan,Heng Zou,Haiyu Zhang,Dianwen Liu,Shuming Wen,Yanjun Li
The separation of galena (PbS) from chalcopyrite (CuFeS 2 ) requires strong oxidants for the depression of PbS, due to the excellent hydrophobicity of PbS. In this work, an advanced oxidation process, i.e., S 2 O 8 2− /Fe 2+ treatment, was employed to selectively depress PbS. The parameters of the S 2 O 8 2− /Fe 2+ process were determined via flotation tests as follows: pH 3, 1:1 S 2 O 8 2− : Fe 2+ molar ratio, and 10 min reaction time. The S 2 O 8 2− /Fe 2+ treatment selectivity decreased the hydrophobicity of the PbS surface. UV–vis spectroscopy results revealed that SO 4 − (major species) and OH radicals were produced in solution by the activation of Fe 2+ . The SO 4 − / OH radicals reacted with the PbS surface, generating the SO 4 2− and PbSO 4 species. These species coated the PbS surface, forming a hydrophilic PbS surface and inhibiting the PbS flotation. By contrast, the S 2 O 8 2− /Fe 2+ treatment generated only a minimal amount of SO 4 2− (5.98 % of the total S species) on the CuFeS 2 surface. Therefore, the CuFeS 2 surface was hydrophobic and CuFeS 2 particles could still be floated into the foam phase. This study provides a promising method for the selective depression of PbS in the PbS-CuFeS 2 mixture.
研究领域:
矿物加工工程
·
化学工程
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Wenlong Xiao,Fang Wang,Xuchen Wang,Nani Wang
An imbalance in iron homeostasis contributes to mitochondrial dysfunction, which is closely linked to the pathogenesis of various diseases. Herein, we developed a nanosensor for detecting mitochondrial ferrous ions in vitro and in vivo . A poly( N -isopropylacrylamine)-coacrylic acid nanohydrogel was synthesized, and ferrous ions were detected using the fluorescent probe FeRhonox-1 embedded within it. (3-Carboxypropyl)-triphenylphosphonium bromide was chemically conjugated to the hydrogel matrix to enable mitochondrial targeting. The developed nanosensor showed a narrow particle size distribution, high sensitivity and selectivity for ferrous ions, and low cytotoxicity, enabling the nanosensor to sense and image ferrous ions in mitochondria with high spatial resolution. Changes in ferrous ion concentrations in human umbilical vein endothelial cells were measured and imaged after lipopolysaccharide (LPS) or iron dextran treatment. Moreover, the nanosensor was successfully used for ferrous ion imaging in live mice. The in vivo results showed that LPS injection induced the accumulation of mitochondrial ferrous ions. The proposed nanosensor could serve as a powerful tool for monitoring ferrous ions in mitochondria, providing strong support for studying disorders of iron metabolism.
研究领域:
生物化学
·
医学影像
·
分子生物学
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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）