المجلة الدولية للعلوم والتقنية

Orange fruits have a high economic value, as in recent years an increase in production has been observed, and thus an increase in orange peels and seeds left over from industrial food processes and human consumption. To exploit these wastes, it was found that they have the ability to absorb metal ions. Using natural adsorbents to extract metal ions is a very effective method, and one of the advantages is that it is an inexpensive and environmentally friendly method. Therefore, this study aims to compare the efficiency of four types of orange peels (Kenyan, Citrus aurantium, Dummy, and White) in absorbing double copper ions from their aqueous solutions, as work was done to determine some of the adsorption conditions, which are mixing speed and pH. The pH of 2.8 and the mixing speed of 50 rpm for the Kenyan samples, Citrus aurantium, and Demi were 35.7, 28.57, 47.1, and 32.85, respectively. At a pH of 2.8 and a mixing speed of 100 rpm, the copper ionic removal rates for the Kenyan, citrus, and sample samples were 32.28, 25.71, 21.42 and 21.42, respectively. At the same pH and mixing speed of 150 rpm, the removal rate of binary copper ions for the Kenyan, citrus, and samples was 18.57, 32.85, 14.28 and 11.42, respectively. The removal rates of binary copper ions for the Kenyan, Citrus, and Demi samples were fine at pH 6.4 and the mixing speed of 50 and 100 150 rpm, respectively, 69.28, 67.85, 61.42, 61.85 and 64.28, 59, 75, 64.28 and 75, 53.57, 75, 64.28. As for the removal rate of binary copper ions for the Kenyan, Citrus, and Demi samples, it is fine at pH10 and the mixing speed is 50 and 100 150 rpm, respectively, 55.71, 35.71, 50, 39.28 and 62.85, 37.85, 52.85, 50 and 55, 35.71, 46.42, 53.57. For the highest extraction rate, the mixing speed was 50 revolutions per minute for all orange peel samples, because the higher the mixing speed, the lower the extraction rate of the two copper ions, due to the saturation of the orange peel surface and its chemical equilibrium.