Int. J. Chem. Technol. 2022, 6 (1), 66-75 Keskinkan and co-workers DOI: http://dx.doi.org/10.32571/ijct.1131313 E-ISSN: 2602-277X 66 International Journal of Chemistry and Technology http://dergipark.org.tr/ijct Research Article The usage of palm (Washingtonia filifera) fibers for the removal of crystal violet from synthetic dye solution by adsorption Buket KARABAŞ, Olcayto KESKİNKAN * , Bülent SARI, Hasan Kıvanç YEŞİLTAŞ, Çağatayhan Bekir ERSÜ Cukurova University, Faculty of Engineering, Department of Environmental Engineering, Adana, Türkiye Received: 16 June 2022; Revised: 26 June 2022; Accepted: 27 June 2022 *Corresponding author e-mail: olcayto@cu.edu.tr Citation: Keskinkan, O.; Karabaş, B.; Sarı, B.; Yeşiltaş, H. K.; Ersü, Ç. B. Int. J. Chem. Technol. 2022, 6 (1), 66-75. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ABSTRACT The objective to obtain cheap and easily synthesized adsorbents from natural materials is gaining importance day by day. Adsorbents should be environmentally friendly, non-toxic, easily produced, insoluble in water, have a porous structure, have a large surface area, and be scientifically accepted. In this study, the removal of crystal violet dye from synthetic dyestuff solution was investigated using palm tree (Washingtonia filifera) fibers. In order to determine the contact time, the first set of experiments employed 0.5 g of palm fibers and initial dye concentrations between 2.5-160 mg/L. As a result of the study, it was determined that the crystal violet removal was 87.96% at the end of the 180-minute contact time at equilibrium, and the removal complied with the pseudo-second-order kinetic model type 1. The equilibrium time for the highest initial adsorbate concentration (160 mg/L) was 2880 minutes (2 days) in stationary phase systems while it was 180 minutes (3 hours) in mobile phase systems. It was also understood that palm fiber, which is an environmentally advantageous material, can be used in the removal of crystal violet dyestuff. Keywords: Washingtonia filifera, dyestuff removal, crystal violet, chemical kinetic. Sentetik boyar madde çözeltisinden kristal viyolenin adsorpsiyonla gideriminde palmiye (Washingtonia filifera) liflerinin kullanılması ÖZ Doğal malzemelerden düşük maliyetli ve kolay sentezlenen adsorbanlar elde etme hedefi her geçen gün önem kazanmaktadır. Adsorbanlar çevre dostu, toksik olmayan, kolayca üretilebilen, suda çözünmeyen, gözenekli bir yapıya sahip, geniş bir yüzey alanına sahip ve bilimsel olarak kabul görmüş olmalıdır. Bu çalışmada, palmiye ağacı (Washingtonia filifera) lifleri kullanılarak sentetik boyarmadde çözeltisinden kristal viyole boyanın giderimi araştırılmıştır. Temas süresini belirlemek için, ilk deney grubu 0,5 g palmiye lifi ve 2,5-160 mg/L arasındaki başlangıç boya konsantrasyonları kullanılmıştır. Araştırma sonucunda ise dengeye 180 dakikalık temas süresi sonunda kristal viyole gideriminin %87,96 olduğu ve giderimin yalancı ikinci dereceden kinetik model tip 1'e uygun olduğu belirlenmiştir. En yüksek başlangıç adsorbat konsantrasyonu (160 mg/L) için sabit fazlı sistemlerde 2880 dakika (2 gün), mobil fazlı sistemlerde ise 180 dakikada (3 saat) dengeye ulaşılmıştır. Çevre açısından avantajlı bir malzeme olan palmiye lifinin de kristal viyole boyar maddelerin uzaklaştırılmasında kullanılabileceği tespit edilmiştir. Anahtar Kelimeler: Washingtonia filifera, boyarmadde giderimi, kristal viyole, kimyasal kinetik. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 1. INTRODUCTION Today, dyestuffs are used as auxiliary substances in the production activities of industries that include printing and dyeing processes such as paper, cosmetics, leather, pharmaceuticals, especially the textile industry. The amount and type of dyestuffs used in the relevant production processes are highly variable according to the production process and product variety. 1-3 It is estimated that the amount of dyestuff produced annually in the world is more than 70,000 tons and that more than 10,000 types of dyestuffs are introduced to the market every year. 4 All of the dyestuffs produced for industrial utilization are not used efficiently in the process, and their residues pass into the wastewater of the process. 1,5 In the case of dyestuff containing wastewater discharges