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Adsorption of residual amine collector HAY from aqueous solution by refined carbon from coal fly ash and activated carbon 被引量:2
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作者 李显波 叶军建 +4 位作者 邱跃琴 李龙江 卯松 刘志红 张覃 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第1期30-38,共9页
Refined carbon(RC) derived from coal fly ash(CFA) as well as powdered activated carbon(PAC) was investigated as adsorbent to remove residual amine collector HAY from aqueous solution.The RC and PAC were characterized ... Refined carbon(RC) derived from coal fly ash(CFA) as well as powdered activated carbon(PAC) was investigated as adsorbent to remove residual amine collector HAY from aqueous solution.The RC and PAC were characterized by scanning electron microscopy(SEM),surface area measurement,Zeta potential measurement and Fourier transform infrared(FTIR) spectroscopy.The effect factors and mechanisms of HAY adsorption onto RC and PAC were studied in detail.The results show that the experimental kinetic data agree well with the pseudo second-order equation,and the Langmuir isotherm model is found to be more appropriate to explicate the experimental equilibrium isotherm results than the Freundlich model.The adsorption capacities of PAC and RC increase with pH.It is found that alkaline condition is conducive to the adsorption of HAY onto PAC and RC and the adsorption efficiency of RC is close to PAC at pH near 11.Zeta potential variation of adsorbents suggests that HAY generates electrostatic adsorption onto RC and PAC.FTIR analysis shows that the adsorption is dominantly of a physical process.The Box-Behnken design optimization conditions of process are RC 1 g/L,pH 11,temperature 302 K and initial HAY concentration 100 mg/L.Under these conditions,the measured adsorption ratio and adsorption capacity are 87.91%and 87.91 mg/g,respectively.Thus,the RC is considered to be a potential adsorbent for the removal of residual amine from aqueous solution. 展开更多
关键词 powdered activated carbon coal fly ash refined carbon ADSORPTION amine collector HAY
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Flotation behavior of four dodecyl tertiary amines as collectors of diaspore and kaolinite 被引量:5
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作者 Changmiao Liu Feng Ansheng +2 位作者 Guo Zhenxu Cao Xuefeng Hu Yuehu 《Mining Science and Technology》 EI CAS 2011年第2期249-253,共5页
The flotation of diaspore and kaolinite by one of a series of tertiary amines(DRN,DEN,DPN and DBN) was investigated.The tertiary amines show better floating recovery for kaolinite compared to diaspore.The maximum re... The flotation of diaspore and kaolinite by one of a series of tertiary amines(DRN,DEN,DPN and DBN) was investigated.The tertiary amines show better floating recovery for kaolinite compared to diaspore.The maximum recovery D-value is 45%over a pH range from 3 to 8.FT-IR spectra confirm the presence of hydroxyl groups on the surface of kaolinite and diaspore.Zeta potential measurements show that the mineral surfaces are negatively charged over a wide pH range.Ionization of hydroxyl groups mainly accounts for the surface charging mechanism.The adsorption of tertiary amines onto the mineral surface is due mainly to electrostatic effects and the difference in electrostatic effect between a collector and the two minerals can explain the flotation separation.Inductive electronic and steric effects from the substituent groups result in different collecting powers for the four tertiary amines. 展开更多
关键词 KAOLINITE DIASPORE amines collectors Froth flotation
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