CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Hongming Rui,Licheng Zhang,Lijuan Li,Lixia zhu
The present work used solvent extraction method to extract lithium from hydrochloric acid leaching solution of high-alumina coal fly ash. In extraction stage, the optimum conditions were explored, at 20 ℃ and O/A = 1:4, using 70%(Vol.) tributyl phosphate-30%(Vol.) sulfonated kerosene-0.36 mol/L Fe 3+ as extractant, extraction of lithium could reach 99% by two-stage extraction. In scrubbing stage, 95% of Al 3+ in loaded organic phase was scrubbed with 6 mol/L HCl at O/A = 40:1, then 97% of Ca 2+ in the loaded organic phase was scrubbed by three-stage countercurrent scrubbing with 5.5 mol/L LiCl + 0.5 mol/L HCl at O/A = 30:1. In stripping stage, 99% of Li + in scrubbed organic phase was stripped by five-stage countercurrent stripping with 6 mol/L HCl at O/A = 10:1. In regeneration stage, 2 mol/L NaOH was used as regenerant to remove free acid and exchange H + of extractive compound. There were no third phase, emulsification and solid deposition during the whole experiment. The structure of extractive compound was determined by slope method, and extracted complex ratio of Li + , Fe 3+ , and TBP was 1:1:1. The extraction process was found to be exothermic and spontaneous by thermodynamic study. Therefore, it’s a promising method to recover lithium from hydrochloric acid leaching solution of high-alumina coal fly ash by TBP-FeCl 3 -sulfonated kerosene extraction system.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Shuifang Mao,Yanming Ren,Shiguo Chen,Donghong Liu,Jinhu Tian,Xingqian Ye
Favorable hydrogels can be used as a material to deliver bioactive molecules and improve the stability of bioactive substances, while their safety needs to be improved. In this study, protocatechuic acid (PCA) and Fe 3+ were rapidly self-assembled to form a metal-phenolic network under different pH conditions, and then sodium alginate (SA) was added to prepare the SA/PCA/Fe hydrogel without adding other chemical reagents. The structural characteristic of SA/PCA/Fe hydrogel was characterized by infrared spectroscopy, X-ray diffraction analysis and scanning electron microscopy. The results showed that the structures of SA/PCA/Fe hydrogels prepared at different pH values were significantly different. The texture analysis, water-holding measurement and rheological analysis indicated that the SA/PCA/Fe hydrogel showed higher gel strength, water holding capacity and storage modulus. Thermogravimetric analysis illuminated that the SA/PCA/Fe hydrogel enhanced the thermal stability of free anthocyanins through encapsulating anthocyanins. Moreover, in vitro simulated digestion experiment revealed that SA/PCA/Fe hydrogel could control the release of anthocyanins in the simulated gastrointestinal tract. To sum up, this present study might provide a safer and feasible way for the delivery of bioactive substances.
研究领域:
材料科学
·
生物技术
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Ruyi Li,Fangyuan Liang,Xianyun Hu,Huiyang Bian,Chao Deng,Farzad Seidi,Baiyang Zhang,Huining Xiao,Yuqian Liu
In this work, a versatile cellulose nanocrystal‑carbon dots (CNC-CDs) architecture is prepared and applied in environmental remediation and biological sensing. The citric acid (CA) is employed to extract CNCs and in-situ synthesize blue-emissive CDs. The carboxyl-rich surface of CNC-CDs enables the chelation of Hg 2+ and fluorescence quenching of CDs, realizing the detection and adsorption of Hg 2+ with a film comprised of the architecture. The limit of detection (LOD) is measured as 12.8 nM with satisfying retention efficiency. The versatility of CNC-CDs is demonstrated by the fabrication of a fluorescence resonance energy transfer (FRET) sensor using m-tetrakis(4-sulfonatophenyl)porphine (TSPP) as FRET acceptor and Fe 3+ receptor. Fluorescence of the sensor is responsive to Fe 3+ in a ratiometric manner, which significantly contributes to the visualized and sensitive Fe 3+ detection (6.9 nM). In combination with excellent biocompatibility, the FRET sensor is capable of imaging intracellular Fe 3+ .
研究领域:
环境科学
·
材料科学
·
分析化学
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Ying Zhou,Waqar Uddin,Gang Hu
In this paper, a kinetic method for identification of metal ions (Fe 3+ , Cu 2+ and Ag + ) was reported by using their perturbation effects on a Briggs-Rauscher (BR) oscillating system involving a tetraazamacrocyclic complex [NiL](ClO 4 ) 2 as a catalyst. The ligand (L) in the catalyst is 5,7,7,12,14, 14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. When an equal amount of analytes (metal ions) were separately added to the active BR-system under the same concentration, quite different perturbation results were obtained in their concentration ranges from 1.0 × 10 −4 to 2.0 × 10 −3 mol/L. Furthermore, based on the FCA and NF models, the perturbation mechanisms of three metal ions on BR system were explained in details. It is shown that the different perturbation manners are attributed to kinetic-controlled mechanisms. Such mechanisms suggested that both Fe 3+ and Cu 2+ may face a competitive reaction with IO 3 − to form iodate precipitate when they react with I − (an intermediate in BR system) vs redox reaction, whereas Ag + directly binds to I − to generate AgI without a competitive reaction which yields iodate precipitate. Also, the method could be used for quantitative determination of Ag + .
研究领域:
分析化学
·
物理化学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Zizhang Guo,Yan Kang,Zhen Hu,Shuang Liang,Huijun Xie,Huu Hao Ngo,Jian Zhang
The limited adsorption capacity of the substrate and the concentration of dissolved oxygen in constructed wetlands (CWs) have inhibited their ability to efficiently remove polycyclic aromatic hydrocarbons (PAHs) from wastewater. Presently, biochar and activated carbon modified with Fe 3+ and Mn 4+ were used as effective sorbents in the removal of benzofluoranthene (BbFA), a typical PAH, in CW microcosms. The addition of metallic ions embedded carbon increased NO 3 -N accumulation by the reduction of Fe 3+ and Mn 4+ , which led to improved BbFA degradation. Additionally, plant adsorption in root and stem sections were observed separately. The abundance of PAH-degrading microbes in the rhizosphere substrate was higher with the metallic ions embedded carbon than control group. The Fe 3+ , Mn 4+ and NO 3 -N served as electron acceptors increased BbFA microbial degradation. The removal pathways of BbFA in the modified CWs were proposed which involved settlement in the substrate, plant absorption, and microbial degradation.
研究领域:
环境工程
·
水处理
·
生物修复
·
环境微生物学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Jia-Nan Zhang,Hengwei Zhu,Tianqi Liu,Yuanyuan Chen,Chen Jiao,Changcheng He,Huiliang Wang
The adhesion of hydrogels has drawn rapidly growing attention due to its wide potential applications. However, currently reported hydrogel adhesion methods are mostly complex and usually with low adhesion strength . Here we report a convenient and versatile method to achieve strong adhesion of hydrogels. By using negatively charged polyacrylic acid (PAA) and positively charged polyethyleneimine (PEI) as adhesives, strong adhesion is formed between the two hydrogels mainly through electrostatic interactions . Moreover, the adhesion energy can be further enhanced by the pre-complexation of PAA with Fe 3+ at a proper pH (3.0). It's worth noting that the highest adhesion energy of 2178 J/m 2 can be obtained after 10 days' setting. Additionally, the adhesion method enables multiple repeatable adhesion of hydrogels with 87% highly adhesion efficiency after three peeling off-rejoining cycles. This adhesion method can also be applied to the adhesion of other types of hydrogels and adhering hydrogels to other solid materials.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Changye Mang,Guanghui Li,Yanhu Chen,Jun Luo,Mingjun Rao,Tao Jiang
Partial neutralization is typically used to remove Fe 3+ ions from the acid leach solution of laterite. However, during this process, significant amounts of Mg 2+ , Ni 2+ , Co 2+ , and SO 2– 4 are lost. With increasing initial Fe 3+ concentration and solution pH, the severity of loss increases, with the precipitation of Fe 3+ . In this study, the mechanisms of ion co-precipitation during partial neutralization were investigated. Based on density functional theory calculations, a precipitation pathway through the formation of [Fe 4 (OH − ) 2 (SO 2– 4) 4 ]•[2SO 2 – 4 •yH 2 O]•[M 2+ ] was proposed. The differential charge density diagram indicated that the O atoms acted as the charge acceptors and maintained the precipitate structure. The coordination between M 2+ and SO 2– 4 could be destroyed via intense agitation, releasing approximately 100% of Mg 2+ , Ni 2+ , and Co 2+ ions from the precipitates to the solution. Furthermore, the addition of cationic or anionic surfactants limited the formation of these coordination bonds. The highest retention percentages of Mg 2+ , Ni 2+ , and Co 2+ in solution were 99.4, 99.6, and 99.9%, respectively, after adding 2 × 10 −5 mol/L of sodium dodecylbenzenesulfonate (CTAB). In addition, a high temperature could break these coordination bonds. The retention percentages of Mg 2+ , Ni 2+ , and Co 2+ increased from 82.6, 85.2, and 86.5% to 99.9, 99.6, and 99.8%, respectively, as the temperature increased from 25 to 65 °C. These results confirmed the rationality of the proposed structure of the precipitate.
研究领域:
化学工程
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Rui Wang,Simin He,Wanjing Liu,Hebing Pei,Nijuan Liu,Ruibin Guo,Zunli Mo
Carbon quantum dots are widely used in the field of analysis and detection due to their excellent optical properties. At present, many studies have focused on the preparation of multi-color fluorescent quantum dots by simple methods. Inspired by this, carbon quantum dots with green (G-CQDs) and yellow fluorescence (YN-CQDs) emission were prepared by hydrothermal method using PTCDA and urea as precursors. After characterizing their morphology, structure, and optical properties, fluorescent probes for different purposes were constructed according to their different fluorescence characteristics. Since green G-CQDs are sensitive to acidic environments, pH detection kits are developed. In addition, G-CQDs can also efficiently detect Asp. YN-CQDs are used to detect metal ions and can specifically detect Fe 3+ . Both of them were applied to the detection of actual samples, showing high efficiency and reliability. It provides a new idea for the multi-purpose detection of carbon quantum dot fluorescent probes.
研究领域:
分析化学
·
材料科学
·
光学性质
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-7
·
IF 16.6
Wang Zhi-Da,Liang Song,Yang Yuqing,Liu Zhen-Ning,Duan Xiao-Zheng,Li Xinpei,Liu Tianbo,Zang Hong-Ying
Inorganic salts usually demonstrate simple phasal behaviors in dilute aqueous solution mainly involving soluble (homogeneous) and insoluble (macrophase separation) scenarios. Herein, we report the discovery of complex phase behavior involving multiple phase transitions of clear solution – macrophase separation – gelation – solution – macrophase separation in the dilute aqueous solutions of a structurally well-defined molecular cluster [Mo 7 O 24 ] 6− macroanions with the continuous addition of Fe 3+ . No chemical reaction was involved. The transitions are closely related to the strong electrostatic interaction between [Mo 7 O 24 ] 6− and their Fe 3+ counterions, the counterion-mediated attraction and the consequent charge inversion, leading to the formation of linear/branched supramolecular structures, as confirmed by experimental results and molecular dynamics simulations. The rich phase behavior demonstrated by the inorganic cluster [Mo 7 O 24 ] 6− expands our understanding of nanoscale ions in solution.
研究领域:
无机化学
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 17
·9975-9989
·
IF 4.21
Zhang Haitao,Wu Xiaojun,Qin Zhihui,Sun Xia,Zhang Hong,Yu Qingyu,Yao Mengmeng,He Shaoshuai,Dong Xiaoru,Yao Fanglian,Li Junjie
Hydrogel-based strain sensors have been widely investigated owing to their intrinsic flexible and extensible properties. However, integrating good mechanical properties and excellent strain sensitivity into one hydrogel remains a challenge. In this work, a dual physical cross-linked carboxymethyl cellulose-Fe 3+ /polyacrylamide (CMC-Fe 3+ /PAAm) double network hydrogel was developed by facile two-step method. In this hydrogel, the Fe 3+ cross-linked CMC acts as the first network for dissipating energy and hydrophobic association PAAm acts as the second network to maintain the integrity of hydrogel. Owing to these physical interactions, the as-prepared hydrogel shows good mechanical properties (e.g., tensile strength, 1.82 MPa; toughness, 6.52 MJ/m 3 ). Furthermore, these mechanical behaviors can be modulated by adjusting the solid content, CMC/PAAm ratio, Fe 3+ concentration and soaking time in Fe 3+ solution. Moreover, the obtained hydrogel shows excellent self-recovery and anti-fatigue property due to the reversibility of dual physical cross-linked interactions. Additionally, the CMC-Fe 3+ /PAAm hydrogel shows good conductivity (1.82 S/m), strain sensitivity (gauge factor = 4.02 at 50–600% strain), and fast response time (260 ms). Based on the high strain sensitivity, the CMC-Fe 3+ /PAAm hydrogel can fabricate a flexible strain sensor for precisely monitoring various human motions. This study suggests that the CMC-Fe 3+ /PAAm hydrogel exhibits potential application in the flexible and stretchable strain sensors. Graphic abstract
研究领域:
材料科学
·
机械工程
·
生物医学工程
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yanping Zhu,Runliang Zhu,Yunfei Xi,Tianyuan Xu,Lixia Yan,Jianxi Zhu,Gangqiang Zhu,Hongping He
The conventional heterogeneous Fenton reaction is often confined by the lower regeneration of Fe 2+ , which then inhibits the decomposition of H 2 O 2 and the generation of OH. Here we propose a novel idea to significantly accelerate the redox cycling of Fe 2+ /Fe 3+ in heterogeneous Fenton reaction by introducing photo-generated electrons from plasmonic particles. Towards this aim, novel plasmonic Ag/AgCl nanoparticles coated ferrihydrite (Ag/AgCl/Fh) have been synthesized. Compared with pure Fh, a remarkable enhancement in the photo-Fenton degradation towards bisphenol (BPA) can be observed for all Ag/AgCl/Fh samples under visible light. Noticeably, the rate constant of 6%Ag/AgCl/Fh is 0.0506 min −1 , which is about 5.1 times as high as that of pure Fh (0.0099 min −1 ). Moreover, the catalytic activity of 6%Ag/AgCl/Fh on the degradation of BPA remains quite efficient with a low Fe leaching after 4 recycles. The results of the effect of initial pH indicates that Ag/AgCl/Fh samples exhibit relatively high photo-Fenton catalytic activity even at pH 6. The electron spin resonance (ESR) analysis reveals that OH plays a significant role in the photo-Fenton reaction. The concentration of OH can even reach 267.6 μmol/L after 60 min, which is much higher than that of pure Fh (69.2 μmol/L). The measurement of Fe 2+ concentration and the XPS Fe2p spectra of Ag/AgCl/Fh before and after the degradation of BPA indicate the loading of Ag/AgCl can accelerate the conversion of Fe 3+ /Fe 2+ by the photo generated electrons from Ag nanoparticles due to the surface plasmon resonance (SPR) effect under the visible light irradiation.
研究领域:
环境科学
·
催化
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 11
·6193-6204
·
IF 6.123
Lv Haifeng,Wang Sijie,Wang Zhenxing,Meng Wanyao,Han Xuewen,Pu Junwen
With the development of science and technology, various counterfeit and inferior products are emerging in endlessly, which makes people more and more important to the development of anti-counterfeiting technology. Materials capable of fluorescence imaging and biocompatibility are becoming popular in the field of anti-counterfeiting. Herein, we used carbon quantum dots, which had the characteristics of biocompatibility, non-toxicity, and high-efficiency luminescence, as the luminescence center, and introduced them into the carboxymethyl cellulose-based hydrogel to prepare a novel fluorescent cellulose-based hydrogel. The hydrogel displayed a bright blue color fluorescence under UV light, and Fe 3+ could quench the fluorescence, thereby realizing information storage and anti-counterfeiting. Moreover, the stored information could be erased by ascorbic acid and reused many times. The results demonstrated that the fluorescent hydrogel had bright prospect for recyclable information storage and anti-counterfeiting.
研究领域:
材料科学
·
纳米技术
·
化学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）