Adsorption of Methylene Blue using the Biosorbent of Coconut Fiber Activated by Nitric Acid

  • Anselmus Boy Baunsele Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Aloisius Masan Kopon Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Erly Grizca Boelan Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Maria A. U. Leba Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Faderina Komisia Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Maria B. Tukan Chemical Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Maximus M. Taek Chemistry Study Program, Faculty of Mathematics and Natural Sciences, Widya Mandira Catholic University, Kupang, Indonesia
  • Gerardus D. Tukan Chemistry Study Program, Faculty of Mathematics and Natural Sciences, Widya Mandira Catholic University, Kupang, East Nusa Tenggara, Indonesia
  • Hildegardis Missa Biology Education Study Program, Faculty of Teacher Training and Education, Widya Mandira Catholic University, Kupang, Indonesia
  • Dwi Siswanta Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta , Indonesia
  • Johnson N. Naat Chemical Education Study Program, Faculty of Teacher Training and Education, Nusa Cendana University, Kupang, Indonesia
  • Rahayu Rahayu Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Pattimura, Ambon , Indonesia

Abstract

The textile industry in the world keeps increasing, but it harms environmental pollution caused by textile dye waste. Synthetic dyes contain carcinogenic and mutagenic ingredients that can demage the environment and aquatic biota. The alternative to handling dye pollution with a low-cost method is adsorption using nitric acid-activated coconut fiber. Coconut fiber was an abundant agricultural waste and economical, and it had an active site that contained many compounds such as cellulose, lignin, pyroligneous acid, and tannin molecules. This study used the UV-Vis Spectrophotometer analysis method to determine the effect of pH, contact time, and coconut fiber on the adsorption capacity of methylene blue. The result showed that the optimal conditions for adsorption were a pH of 5, a contact time of 75 minutes, and a percentage adsorption of the variation of contact time of 99.628%. The adsorption study was according to a pseudo-second-order reaction with a constant reaction rate of 0.050 g mg-1 minute-1. The maximum adsorption capacity was 2 mg g-1, with the percentage of methylene blue adsorbed at 99.84%. Adsorption occurs chemically with an energy of 35.4 kJ mol-1, so it can be determined that it occurs with a monolayer mechanism.


 

Published
2024-03-14
How to Cite
BAUNSELE, Anselmus Boy et al. Adsorption of Methylene Blue using the Biosorbent of Coconut Fiber Activated by Nitric Acid. Molekul, [S.l.], v. 19, n. 1, p. 128-142, mar. 2024. ISSN 2503-0310. Available at: <http://jos.unsoed.ac.id/index.php/jm/article/view/9443>. Date accessed: 17 apr. 2024. doi: https://doi.org/10.20884/1.jm.2024.19.1.9443.
Section
Articles