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中南学子木虫 (正式写手)
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Generally, the fly ash particles exhibit a pH of 7.0. This indicates that at pH lower than 7.0, the fly ash surface is positively charged and the opposite is true at pH higher than 7.0。Therefore, under the pH conditions at adsorption equilibrium, i.e. pH 4.0–5.0 for both Zn(II) and Ni(II) wastewaters, the surface of the fly ash is negatively charged. At low pH the surfaces of the fly ash were positive and there was a formation of complex [Pb(OH)4]2- and [Cu(OH)4]2-, the complex formed will be adsorbed on the fly ash surfaces. Hydroxyl-metal complex has higher affinity for adsorption than hydrated metal ion, because the formation of an OH group of the metal ion reduces the free energy required for adsorption。Similar results have been reported by other workers working on the adsorption of heavy metal ions on fly ash。At higher pH, the surfaces of the adsorbent were negative and there was an increase on the uptake of Pb2+ and Cu2+ ions by the fly ash. The increase on metal ion uptake, may be explained in terms of electrostatic interaction. This canbe seen by the sharp increase on the amount of metal ions uptake as pH increase from 6 to 10 for Pb2+ ions. The increase in metal ions uptake by fly ash at higher pH values may be attributed to calcium content and (SiO2+Al2O3 + Fe2O3) content that provides alkalinity in the system raising the pH to strongly alkaline values, thereby facilitating the uptake of Pb2+ and Cu2+ ions by the fly ash. At lower pH values between 4 and 6, Cu2+ and Pb2+ ions may be removed from solution by precipitation and can be adsorbed on the surface of fly ash. This is shown by decrease in adsorption by lead ions at lower pH values between 4 and 6. Whereas, at higher pH values higher degree of precipitation of metal ions occur, because hydration of fly ash increases its pH between 10 and 13. Similar results have been reported by some workers working on the adsorption of heavy metal ions on fly ash。 请大侠帮忙翻译一下这2段文字，谢谢~ |
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