SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Ce Wang,Yuling Lü,Hongwei Qi,Xiaoming Luo,Limin He
Flotation technology is widely utilized to remove emulsified oil droplets from Produced water. Organic acid adsorption on the oil droplet surface affects bubble attachment, reducing oil removal efficiency. This investigation exploited the principle of similar dissolution to synthesize condensate bubbles (CB). The surface properties of oil droplets and CB and air bubbles (AB) were appraised using FTIR, zeta potential , interfacial tension, and contact angle measurements. The research also investigated the effects of acetic acids (AA) on the adhesion of oil droplets to AB and CB along with the underlying mechanism via the Extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) interaction theory and the Stefan-Reynolds model of liquid film thinning, integrated with adhesion times. Flotation efficiency and kinetic dissimilarities between AB and CB were also examined. The results indicated that CB exhibits superior lipophilic hydrophobicity compared to AB, reduced induction and spreading times upon oil droplet attachment, and maximized oil removal efficiency. Furthermore, CB could mitigate the impact of AA on adhesion. The interaction barriers between CB and oil droplets were minimal, and the thinning rate of the hydration film was quicker than in AB. The conventional first-order model proved effective in fitting the AB flotation, whereas a delay constant was applied to the model of the CB flotation rate.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
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2022
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IF 5.64
Zechen Liu,Hourui Ren,Zhe Yang,Yinfei Liao,Yijun Cao
The effect of addition sequence for mixed collectors comprising of dodecane(D) and n-valeric acid(A) on low-rank coal flotation was explored by the following three sequences: D first and then A(D + A), A first and then D(A + D), D and A were added simultaneously(M). The total organic carbon , contact angle, zeta potential , and X-ray photoelectron spectroscopy results revealed that the coal had the highest adsorption capacity and the best hydrophobicity for the M, followed by A + D and D + A. The molecular dynamics simulation results indicated that for the M, the reagent molecules D and A worked together to facilitate the adsorption of the reagent molecules and solved some difficult-to-adsorb sites, not for the D + A and A + D. The M-type addition sequence would obtain the larger non-bonding interaction energy and more hydrogen bonds between collector molecules and the coal surface. Finally, the flotation experiments confirmed that the order of the flotation efficiency was M > A + D > D + A.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
PARTICULATE SCIENCE AND TECHNOLOGY
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2025
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IF 1.5
Yingying Wang,Zhenchao Ma,Yibo Kong,Bobo Zhou,Zhe Li
The coal gasification fly ash (CGFA) has low flotation efficiency and serious environmental pollution, due to the abundant oxygen-containing functional groups and developed pore structures. Herein, the grinding process and novel nano-mixed collectors were synergistically used on enhancing CGFA flotation, where the nano-mixed collectors were synthesized through nanoemulsifying and rapid-cooling method. The grinding time and nano-mixed collector compositions with different beeswax and kerosene contents were used to determine the optimum flotation process parameters. The results indicated that the removal rate of unburned carbon (RUC) for CGFA with optimum grinding process (12 min) and nano-mixed collector system (#4) exhibited significant higher value (92.48%) than that of raw CGFA samples (61.25%). The grinding process could obviously decrease the pore volumes and contents of oxygen-containing functional groups on CGFA surfaces, as well as reduce the average diameter of CGFA samples from 81.538 to 7.872 µm. Moreover, the application of novel nano-mixed collectors as flotation collectors could further improve the surface hydrophobicity, decrease the surface pore volumes, high wetting heat and low water adsorption capacity. Therefore, this study can provide a new approach for solving the problems of low flotation efficiency and improving the efficient utilization of CGFA.
研究领域:
环境科学
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矿物加工工程
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
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2018
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IF 2.969
Bin Jiang,Lele Wang,Jiaxin Na,Xiaoqing Zhang,Yongqiang Yuan,Chunhong Liu,Zhibiao Feng
Aqueous two-phase flotation (ATPF) consisting of 1000 g/mol polyethylene glycol (PEG 1000)/trisodium citrate was developed for the separation of α -Lactalbumin ( α -La) from whey. The flotation efficiency ( E ) and purification factor ( PF ) of α -La were evaluated using the reversed-phase high-performance liquid chromatography (RP-HPLC). The effects of pH, concentration of trisodium citrate, flow velocity, flotation time and whey loading on the E and PF of α -La were investigated. An efficient separation of α -La from whey was achieved using ATPF with pH of 8.20, 5 mL of 0.50 g/mL PEG 1000 solution, 35 mL of 0.40 g/mL trisodium citrate solution and whey (20%, v/v), 30 mL/min of flow velocity and 42 min of flotation time. Under the optimal conditions, E and PF of α -La could reach 87.54% and 5.33, respectively. In addition, the kinetic process of the separation of α -La by ATPF of PEG 1000/trisodium citrate was investigated. The results showed that there were two stages in the separation process. Both stages obeyed the first-order kinetic equation, and the first stage was faster than the second one.
研究领域:
生物化学
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食品科学
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环境工程
✓ 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）