UTILIZATION OF PINEAPPLE (ananas comosus l) LEAVES PLANT WASTE AS A NATURAL BIOSORBENT

The adsorption process is more suitable because the costs required are not too expensive and will not cause new contaminants. Currently, research is being promoted on the use of alternative adsorbents derived from nature. Natural adsorbents in addition to having good adsorption ability, are also more economical. Natural biosorbent from pineapple leaves (Ananas comosus L) which had previously been carried out with carbonation, biosorbent activation, and biosorbent characterization using XRD and BET instruments, respectively. The results of the XRD analysis characterization obtained the diffraction pattern of pineapple leaves carbon, there are several sharp peaks, which are very clear at a diffraction angle of 2θ between 25 to 65 degrees, with a crystallinity degree of 32% and pineapple leaves activated carbon, increased the number of degrees of crystallinity at a diffraction angle of 2θ between 20 to 65 degrees, with a degree of crystallinity of 42.26%. The results of the XRD analysis characterization showed that pineapple leaves biosorbent and pineapple leaves activated carbon had amorphous material structure. This material is composed of atoms that are arranged irregularly and randomly scattered. The results of the BET analysis characterization obtained that each graph meets the classification of type I, type II, and type V adsorption isotherms, it means that these carbons have the same type, namely micropores (< 2nm). The surface area according to BET data on pineapple leaves carbon was 70,418 m2/g and carbon activated had an outer surface area of 39,394 m2/g. Likewise with the results of BJH data, where the surface area of pineapple leaves carbon is 44,775 m2/g higher than carbon activated is 25,685 m2/g.