Sorption-desorption studies on alumina pretreated with acids: I. The anionic dye orange II

Surface Technology Pub Date : 1985-12-01 DOI:10.1016/0376-4583(85)90094-9

V.K. Jain, G.L. Mundhara, Ramesh K. Mishra, J.S. Tiwari

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引用次数: 12

Abstract

Brockmann alumina was subjected to chemical pretreatment with HNO₃, H₂SO₄ and H₃PO₄ of various concentrations, and samples of surface phase pH 3.5 − 8.5 (HNO₃Al₂O₃(n), H₂SO₄-treated Al₂O₃(s)) and pH 4.0 − 8.0 (H₃PO₄-treated Al₂O₃(p)) were prepared. Sorption-desorption behaviour of the anionic dye Orange II (C.I.15510) with change in pH on these substrates was studied. Quantitative sorption is shown at pH ⩽ 4.0 (Al₂O₃(n)), and a maximum is observed at pH 5.0 (Al₂O₃(s)) and pH 3.0 (Al₂O₃(p)). Variation in the amount of sorption with time (10 min – 72 h), temperature (30 – 60 °C) and regeneration of the substrates with aqueous inorganic electrolytes is also reported. Desorption efficacy of the anions is in the order PO₄³⁻ >SO₄²⁻ >NO₃⁻. The acid treatment, and hence the specifically adsorbed anions (NO₃⁻, SO₄²⁻, PO₄³⁻), appears to lower the isoelectric pH of alumina (pH 8.0). The results show the involvement of anion-exchange properties of the alumina.

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酸预处理氧化铝的吸附-解吸研究:1 .阴离子染料橙

采用不同浓度的HNO3、H2SO4和H3PO4对Brockmann氧化铝进行化学预处理，得到表面相pH为3.5 ~ 8.5 (HNO3Al2O3(n)， H2SO4处理过的Al2O3(s))和pH为4.0 ~ 8.0 (H3PO4处理过的Al2O3(p))的样品。研究了阴离子染料橙ⅱ(i .15510)在这些底物上随pH变化的吸附-解吸行为。定量吸附在pH≤4.0 (Al2O3(n))时出现，在pH≤5.0 (Al2O3(s))和pH≤3.0 (Al2O3(p))时达到最大值。吸附量随时间(10分钟- 72小时)、温度(30 - 60°C)和基质与水性无机电解质再生的变化也被报道。阴离子的解吸效果为PO43−>SO42−>NO3−。酸处理，从而特异性吸附阴离子(NO3−，SO42−，PO43−)，似乎降低了氧化铝的等电pH值(pH 8.0)。结果表明，阴离子交换对氧化铝的影响较大。

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Surface Technology

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Subject index Author index Electrochemical aspects of steel corrosion in sea water The impedance of the porous cadmium electrode in alkali Sorption-desorption studies on alumina pretreated with acids: I. The anionic dye orange II