Analytical Methods
·
2012
·Vol. 5
·期 4
·1046-1051
·
IF 1.547
Juan-Juan Ye,Wei Feng,Miao-Miao Tian,Jun-Ling Zhang,Wei-Hong Zhou,Qiong Jia
A novel magnetic adsorbent, magnetic microsphere functionalized with Cyanex272, has been successfully synthesized via a chemical bonding alkylation method. A flow injection on-line preconcentration, with a micro-column packed with the as-synthesized magnetic adsorbent, coupled with UV-Vis spectrophotometric method was developed for the determination of phenol at a wavelength of 270 nm. Various experimental parameters were optimized as follows: eluent (methanol), sample flow rate (1.4 mL min−1), sample volume (1.4 mL), sample pH (5.0), and eluent flow rate (2.2 mL min−1). Under the optimum conditions, the intra-day and inter-day relative standard deviations were 1.37% and 2.69% (n = 5), respectively. The proposed method has been successfully applied to the determination of phenol in phenol ear drops, compound borax solution, and phenol ointment samples and the accuracy was assessed through recovery experiments.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jie Wang,Chaowu Wang,Qibo Zhang
Recycling secondary resources that are rich in valuable metals can help reduce dependence on primary metal ores, foster sustainable industrial development, and enhance the resilience of the metal resource supply chain. This study presents a facile solvent extraction strategy for the efficient recovery of cobalt and nickel from spent choline chloride-ethylene glycol (ChCl-EG, Ethaline) deep eutectic solvent (DES) using bis(2,4,4-trimethylpentyl) phosphonic acid (Cyanex272) as the extractant. By integrating a water-modification approach with pH regulation, the viscosity of the Ethaline system is significantly reduced, while the coordination structures of Co(II) and Ni(II) ions are altered from [CoCl 4 ] 2 ⁻ and [Ni(EG) 3 ] 2+ to [CoCl 2 (H 2 O) 2 (EG) 2 ] 0 and [NiCl(H 2 O) 2 (EG) 2 ] + . This dual modification enables selective extraction with recovery efficiencies exceeding 99 % for both metals, achieving a separation coefficient ( β Co²⁺/Ni²⁺ ) of 9550. Mechanistic insights from density functional theory (DFT) calculations reveal that the preferential extraction of Co(II) stems from its more negative Gibbs free energy change (ΔG Co(II) = -0.21 kJ/mol vs. ΔG Ni(II) = -0.04 kJ/mol) during complexation with saponified Cyanex272. Furthermore, the regenerated Ethaline and Cyanex272 exhibit exceptional stability, maintaining > 95 % extraction efficiency over 10 cycles. This work advances solvent extraction technology by demonstrating a synergistic water-pH strategy for DES-based systems, offering a facile and scalable pathway for recycling metal-laden DES-based electrolytes in industrial applications.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2015
·
IF 1.933
Li Chen,Ji Chen,Yu Jing,Deqian Li
Several novel extraction systems were reported since 2-ethylhexyl phosphonic acid mono-(2-ethylhexyl) ester (P507) had been confronted with low selectivity and incomplete stripping for heavy rare earths (HREs). This paper makes a comprehensive appraisal of P507, bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex272), mixture of P507 and Cyanex272, P507 adding isooctanol and bifunctional ionic liquid extractant (Bif-ILE) [trialkylmethyl-ammonium][di-(2-ethylhexyl)orthophosphinate] ([A336][P507]). Thermodynamics study, apparent kinetics study and theoretical calculation for the cascade extraction are all included. We put forward coordination equilibrium effect for the first time to illustrate the inner and outer environment during the coordination. It could be useful to explain the extraction ability and selectivity of different extractants. All these would provide separation of HREs with more feasible and informative understanding and guidance.
研究领域:
化学工程
·
稀有金属提取
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Li Chen,Huan Dong,Weiguo Pan,Jiangdong Dai,Xaohui Dai,Jianming Pan
Efficient separation of adjacent rare earths is an interesting and challenging job for membrane separation scientists. In this article, a novel polymer inclusion membrane (PIM) incorporating the hydrophilic additive random copolymer poly (vinyl alcohol- co -ethylene) (EVOH) was synthesized. Due to the polarity of P = O and P-OH groups in Cyanex272 and hydrophilicity of –OH groups in EVOH, the membranes exhibited much smaller water contact angles than pure PVDF membranes. And FT-IR results indicated that the addition of EVOH made no difference on the coordination between P = O, P-OH in Cyanex272 and Lu 3+ . SEM and AFM results indicated that the addition of appropriate amount of EVOH could generate more and larger surface pores and internal channels. Optimum membrane compositions and permeation conditions were fixed via static adsorption and dynamics permeation experiments. Separation factor was calculated as high as 3.78, which was much higher than previous studies no matter in solvent extraction or membrane separation. It is worth noting that it’s the first time an obvious carrier’s leakage was observed via characterizations which implied Cyanex272 may be not a perfect carrier in terms of PIM’s stability. All these results proved that this novel PIM with EVOH serving as hydrophilic additive could be further testified in heavy rare earths separation and purification process.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Separations
·
2025
·Vol. 12
·期 12
·
IF 2.7
Rong Zha,Ying Huang,Ling Zhu,Jiali Tan,Zhenfeng Xiong,Baoyan Chi
Hydroxamic acid extractants, such as LIX984, demonstrate high efficiency in extracting nickel from electron-free nickel waste solutions; however, they suffer from a slow extraction rate. This study investigated the effect of adding 2–5 vol.% of three organophosphate extractants (P507, P204, and Cyanex272) to LIX984. The results show that incorporating 2–5 vol.% of P507 or Cyanex272 significantly improves both extraction efficiency and kinetics. The addition of organophosphate extractants increased the extraction rate by 1.5–10 times, indicating a direct correlation between the extractant content and the acceleration of the extraction process, with higher concentrations yielding faster extraction. Compared to the use of LIX984 alone, where nickel extraction efficiency was only 46%, the addition of 5 vol.% P507 increased efficiency to over 99%, with a substantial improvement in extraction rate. Similarly, 2 vol.% P204 achieved a nickel removal efficiency of 99.8%. In non-electroplating waste solutions (pH 4–6), selective removal of iron and zinc impurities was achieved by first adding 2–5 vol.% P204 or P507, followed by adjusting the pH to 6–7 and using a mixture of organophosphate extractants. The spent electroless nickel plating baths were then treated with LIX984 combined with organophosphoric acid extractants, yielding nickel salt solutions of higher purity. Thus, P507, P204, and Cyanex272 serve as effective promoters for the hydroxamic acid extractant LIX984, resulting in both enhanced nickel extraction efficiency and faster extraction kinetics.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongtao Liu,Zekai Qin,Xueli Wang,Maolin Tian,Wenjie Zhang,Lin Li,Jiawei Wen,Guoyong Huang,Shengming Xu
Spent hydrodesulfurization catalysts contain more than 10 ∼ 25 wt% V, Mo and Co, which are not only hazardous materials, but also can be considered as valuable secondary resources. The complete separation of these complex critical metals by solvent extraction still needs to be improved. Here, a selective extraction route for the separation of V/Mo/Co is proposed based on the weak interaction differences between extractants and metal, which is realized by theoretical calculation and experimental verification. This process does not require pretreatment of N1923 and Cyanex272 (C272), thus reduced the consume of acid and base as well as generation of waste water. With the preliminary results of V/Mo, Co/Mo, and V/Co separation, the weak interaction between extractants and metal molecules was revealed by quantum chemical calculations quantitatively. The molecular charge distribution, surface electrostatic potential distribution (ESP) and the average local ionization energy (ALIE) shows the priority reactivity of the metal molecules as: H 6 V 10 O 28 > H 2 Mo 4 O 13 > H 4 V 4 O 12 > H 3 VO 4 > H 2 MoO 4 . The independent gradient model based on Hirshfeld partition (IGMH) show differences in the weak interaction forces as: N1923-V>C272-Mo > C272-V>N1923-Mo > C272-Co. The selective separation process of V/Mo/Co was designed with the guide of above results. The combined recovery of the three metals V, Mo and Co amounted to 83.88 %, 87.08 %, and 99.01 %, respectively. The whole route reduces 3.92 t sulfuric acid and 7.83 t sodium hydroxide per solid, and reduces 1.99 t carbon emissions compared to the conventional route.
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
危险品化学品经营许可证（带存储）