Enhancing Adsorption Ability of Nikkel on Bentonite Clay Mixed with Pozzolanic Materials

Abstract

Bentonite is a type of clay with a large surface area. In the past, there was research on heavy metal treatment with bentonite to increase adsorption efficiency by mixing pozzolanic. Some pozzolanic cannot enhance bentonite’s ability to adsorb high concentrations of heavy metals. This study was conducted to increase the potential of pozzolanic with calcium hydroxide (Ca(OH)₂) for higher adsorption by bentonite mixed with pozzolanic. This test uses sodium bentonite to adsorb nickel (Ni) concentrations of 30,000, 40,000, and 50,000 mg/l. Tested by mixing 5 types of pozzolanic and cement by increasing the adsorbent weight to study the increase and compare the adsorption capacity of bentonite mixed with pozzolanic with and without (Ca(OH)₂. The test uses the batch test method. The results explained the increased capacity of the increased adsorbent weight and when bentonite is mixed with slag, rice husk ash, fly ash, silica fume, and kaolin, it increases adsorption capacity with calcium hydroxide. It was found that the adsorption was higher for 58.6, 73.5, 56.1, 72.4, and 70.7 percent, respectively, as an alternative to adsorbent natural materials and waste materials.