Removal of Crystal Violet and Reactive Green 19 from aqueous solutions using the brown macroalga Halopteris scoparia as a natural biosorbent
Makaleler > Tam Makale · 2026
Yazarlar: Nevra ÖZTÜRK ATAY, İnci TÜNEY KIZILKAYA, Nurdan AKAKÇE
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-ENVIRONMENTAL SCIENCE AND ENGINEERING & TOXIC AND HAZARDOUS SUBSTANCE CONTROL, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2026, cilt 62, ss 1-17
DOI: 10.1080/10934529.2026.2705092
Özet
<p>Industrial discharges of toxic synthetic dyes, such as anionic Reactive Green 19 (RG-19) and cat ionic Crystal Violet (CV), threaten aquatic ecosystems. This study investigates the marine brown macroalga Halopteris scoparia as an untreated, mechanically ground biosorbent for removing RG- 19 and CV from wastewater. Characterization confirmed a rough surface with a negative charge (−17.8±4.08mV), favoring cationic dye adsorption. Batch experiments optimized pH and dosage. Optimum removal occurred at pH 5.0 for RG-19 and pH 7.0 for CV. Using a biosorbent dosage of 20.0g /L , 95.2% of CV and 31.8% of RG-19 were removed from a 50.0mg/ L solution within 120.0min. The maxımum experımental adsorption capacities were 33.5 and 5.5mg/ g respect ively. Kinetics followed the pseudo-second-order model, while isotherms fit the Langmuir model for RG-19 and the Freundlich model for CV. Hydroxyl, carbonyl, and polysaccharide groups partici pated in dye binding. Due to electrostatic attraction, H. scoparia prefers cationic CV over anionic RG-19, proving to be a low-cost, sustainable biosorbent.</p>