Minerals
·
2024
·Vol. 14
·期 6
·534
·
IF 2.2
Chunhua Bai,Xiaoning Yang,Guanghui Li
The removal of low concentrations of rare-earth ions (e.g., Er(III)) from water has stimulated interest in the field of mineral processing and water treatment. Here, an ion-exchange and complexation-assisted precipitation method for the removal of low concentrations of Er(III) from water using heptadecyl-1,1-bisphosphonic acid (HBPA) was investigated. The results showed that effective cation-exchange between Er(III) ions and the bisphosphonate headgroup was achieved, and the solution pH abruptly decreased from 6.5 to around 3.1 at the first stage, which further led to the formation of less soluble Er(III) heptadecyl-1,1-bisphosphonate complexes. While low concentrations of Er(III) ions in water are typically treated by the addition of HBPA, followed by the addition of sodium bicarbonate (adjusting the pH to 6–8) and activate carbon, Er(III) ions could be efficiently removed from aqueous solution after about 30 min based on the cation-exchange and complexation-assisted precipitation method. Additionally, the removal of ultra trace amounts of Er(III) ions was not significantly affected by coexisting trace amounts of alkaline-earth metal ions (Mg2+, Ca2+and Sr2+). HBPA is an effective Er(III) chelator, which may be a potential and promising alternative technique to remove Er(III) ions from aqueous solutions.
研究领域:
矿物加工
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shangxiong Wang,Xudong Zheng,Biao Ji,Tongtong Xu,Miaomiao Li,Kailin Zheng,Jinfeng Mei,Zhongyu Li
The selective recovery of Er(III) from the leachate is of environmental and economic importance based on the non-renewability and strategic position of high-value heavy rare earth elements. In this study, functionalize bacterial cellulose (BC) with unique three-dimensional network structure was used as the oriented imprinting framework for construction of thiourea BC imprinted aerogel (DBCT-IIPS). The oriented assembly process allows all the imprinted sites to be located on the surface of the BC, which greatly improves the mass transfer efficiency compared to the conventional imprinting process. Experimental analysis shows that functional modification of BC and the crosslinking of hydrazine group greatly improve the stability and adsorption properties of aerogel materials. Adsorption experiments showed that DBCT-IIPS can fast and selectively adsorb Er(III) from rare earth leachate. The maximum adsorption capacity reaches 65.43 mg g −1 . After 5 times of adsorption and desorption, adsorption capacity of DBCT-IIPS can still maintain 81.6% of the initial capacity. So, DBCT-IIPS can efficiently and selectively recover of Er(III) from rare earth leachate.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2022
·Vol. 55
·期 4
·288-295
·
IF 1.702
Yanan Huo,Jingxiang Zhou,Zushun Xu,Tianyou Chen,Haonan Ji,Fanbao Zeng,Yun Wang,Xiaoxi Hu
Photochromic coatings have been widely used in many fields such as architecture, transportation, and military because of the combination of reversible color-changing properties with the insulation and protection of substrates. Conventionally, organic photochromic components are used for the preparation of photochromic coatings with fast photo-response and excellent fatigue resistance, but the preparation of these coatings is costly and time-consuming. Here, we have developed a relatively simple and cost-effective strategy for the preparation of water-based photochromic polyurethane coatings. Er(III)-doped WO 3 was synthesized and used as the photochromic component for the preparation of polyurethane/Er(III)-doped WO 3 composites, which were further used for the preparation of photochromic coatings. The properties of the coatings were tested and characterized. Due to their excellent thermal stability, water resistance, fatigue resistance, and photochromism, these coatings might have practical applications in various areas.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Gongle Shen,Linling Zhong,Yuanhang Bi,Yifan Liu,Jiangqi Zhao,Xin Wen,Yifei Zhu,Lei Feng,Li Geng,Fan Yu,Changjun Hou,Xianfeng Wang
Considering the vital role of sulfide ions (S 2- ) in food safety, environmental pollution and public health, accurate and efficient detection of S 2- is of great importance. In this study, Er-MOFs with the structure of four-pointed star was successfully designed and synthesized using Er(III) as the metal center and TCPP as the ligand. It is found that host-guest effects occur between Er-MOFs and S 2- , blocking the ligand-to-metal charge transfer (LMCT) effect and O-H vibration. This progress leads to the fluorescence signal-on of Er-MOFs and the production of a brown color. In view of this, a Er-MOFs-based sensor was constructed for rapid and on-site monitoring of S 2- in water, which shows the triple-signal outputs including fluorescence, absorbance and smartphone-based RGB analysis with high sensitivity and selectivity. More importantly, the successful measurement of S 2- in real water samples with satisfactory recoveries from 96.26 % to 104.03 %, demonstrating the practicality and effectiveness of Er-MOFs for S 2- recognition. Overall, this assay exhibits the promising applications for S 2- measurement in the fields of environmental pollution and food safety.
研究领域:
材料科学
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环境科学
·
食品安全
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产品关联
DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2023
·
IF 2.3
Yuzhe Zhang,Jie Hua,Meiwen Zhao,Hao Wu,Yizi Shao,Man Zhou,Peiyang Gu,Zhongyu Li
Considering the economic benefits and environmental pollution, it is of great significance to recover rare earth elements from wastewater. In this article, the modified bacterial cellulose is the raw material, and multi-wall carbon nanotubes are added to construct together. The ion imprinting technology is introduced to prepare a silicon-based modified film for the recovery of Er(III) and selectively adsorption function of Er(III) in experiments. The maximum adsorption amount of modified carbon nanotube silicon bacterial cellulose composite imprinted membrane can reach 46.52 mg L−1, and the adsorption capacity is greatly improved compared to other methods that of the non-imprinted membrane. The adsorption efficiency of Er(III) can reach 92%.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yaxing Han,Ji Chen,Yuefeng Deng,Tianchi Liu,Hailian Li,Deqian Li
The current separation technique of ion-adsorption high yttrium (Y) rare earth ore (high-yttrium ore) using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) and naphthenic acid (NA) has been confronted with low separation efficiency and high acid consumption. This is a consequence of the low selectivity and the difficulty of complete stripping of heavy rare earths (HREEs). Therefore, an innovative separation technique of high-yttrium ore was proposed. The leachate of high-yttrium ore was firstly divided into Erbium (Er) / Thulium (Tm) groups with P507-isooctanol followed by separating Y (III) from the high Y-enrichment of Er (III) group with sec -octylphenoxy acetic acid (CA12)-tri- n -butyl phosphate (TBP). The basic thermodynamics experiments and cascade extraction simulations were conducted to verify the feasibility of this technology. The results show that P507-15vol% isooctanol is superior to P507 in both stripping ability and separation selectivity of HREEs. The first cascade extraction for Er (III) / Tm (III) grouping with P507-15vol% isooctanol was simulated successfully, reducing acid consumption but obtaining high purity products. In theory, the second cascade extraction simulation designed for separating Y (III) with CA12-TBP could not only improve the separation ability between Y (III) and light rare earths (LREEs) but also shorten the extraction stages and reduce the production costs. All these results revealed that this two-step separation process probably provided a promising application prospect for separating high-yttrium ore.
研究领域:
冶金工程
·
稀土化学
·
分离科学与技术
·
资源加工工程
·
湿法冶金
·
萃取分离
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DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Shao Hong,Xu Dan,Ding Yadan,Hong Xia,Liu Yichun
The authors describe an “off-on” colorimetric and fluorometric assay for the determination of Cu(II). It is based on the use of upconversion nanoparticles (UCNPs) of type NaYF 4 :Yb(III),Er(III) that were functionalized with branched polyethylenimine (BPEI). A color change from colorless to blue occurs within 2 s after addition of Cu(II) to a solution of the modified UCNPs. The color change can be visually detected at Cu(II) concentrations down to 80 μM. The upconversion fluorescence of the modified UCNPs, measured at excitation wavelength of 980 nm, is reduced due to the predominant inner filter effect caused by the formation of the BPEI-Cu(II) complex. Normalized fluorescence intensity drops linearly in the 50 nM to 10 μM Cu(II) concentration range, and the fluorometric detection limit is 45 nM. Both the color and the fluorescence are recovered on addition of EDTA. Excellent selectivity over other metal ions and anions is achieved.
Upconversion nanoparticles of type NaYF4:Yb,Er were functionalized with branched polyethylenimine (UCNP/BPEI) and used in an “off-on” colorimetric and fluorometric assay for Cu(II). The upconversion fluorescence is selectively quenched on addition of Cu(II), and this is accompanied by a rapid colorless-to-blue color switch. The colorimetric changes and quenched fluorescence can be reversed by adding EDTA.
研究领域:
分析化学
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材料科学
·
环境科学
✓ 已验证
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）