Adsorption of Ni (II) Ions from Aqueous Solution by Pyrolytic Chars Derived from the Cottonseed Cake

Abstract

The adsorption of Ni (II) ions from aqueous solution by pyrolytic char obtained from the cottonseed cake was studied in thisarticle. The sample was pyrolysed with a heating rate of 7C min-1 up to select final pyrolysis temperatures of 400C, 550C, and 700C under a steam atmosphere with sweep gas velocities of 2.7 cm sec-1. Three pyrolytic char were used as adsorbent obtained at final pyrolysis temperatures. The influence of experimental parameters such as pyrolysis temperature, adsorbent dosage, condition time, and nickel (II) concentration were investigated. Optimal condition was determined as: 0.35 g/50 ml adsorbent dosage, 10 mg/l Ni (II) concentration, 60 min contact time for temperature 700C of pyrolytic char. Adsorption parameters were determined by using Langmuir isotherm. The adsorption capacity of the pyrolytic char is 25 mg/g and the maximum surface area (47.98 m2/g) was obtained at 700C. According to the experimental results, the pyrolytic char can be used as carbon adsorbent for adsorption processes.