A sustainable cherry laurel–based adsorbent for the adsorptive removal of crystal violet and tartrazine: Kinetics, isotherms, and thermodynamic insights
Journal of the Indian Chemical Society, cilt.103, sa.8, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 103 Sayı: 8
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.jics.2026.102870
- Dergi Adı: Journal of the Indian Chemical Society
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, EMBASE
- Anahtar Kelimeler: Biosorption, Crystal violet, Prunus laurocerasus, Tartrazine
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
Özet
The present study aimed to investigate the adsorption removal efficiency of cationic dye crystal violet (CV) and anionic dye tartrazine (TTZ) by cherry laurel ( Prunus laurocerasus L. stones. The physicochemical properties of the adsorbent were characterized using FTIR, SEM, EDX, and point of zero charge (pHPZC) analyses. In the characterization analyses, the zero point charge pHpzc of CLS was determined to be 4.35. With the increase in the amount of adsorbent, the dye removal capacities decreased from 164.4 to 8.4 mg g−1 for CV and from 156.15 to 7.58 mg g−1 for TTZ. The analysis of the isotherm data indicated that the adsorption of both dyes showed a high fit to the Langmuir model suggesting a monolayer mechanism (R2 = 0.957 for CV, R2 = 0.971 for TTZ). At an ambient temperature of 25 °C and the natural pH levels of the dyes, the maximum Langmuir adsorption capacities were calculated to be 123.87 mg g−1 for CV and 111.60 mg g−1 for TTZ. The free adsorption energy (EDR) obtained from the Dubinin–Radushkevich model showed that the adsorption of CV is chemically inclined (8.001 kJ mol−1), while the adsorption of TTZ is of a physical nature (7.22 kJ mol−1). Kinetic studies have confirmed that both dyes follow a pseudo-first-order (PFO) model. The results of the thermodynamic analysis revealed that the processes are spontaneous (ΔGo), endothermic (ΔHo), and characterized by an increase in disorder (ΔSo). In conclusion, it has been demonstrated that CLS can be successfully employed as a high-capacity, cost-effective, and environmentally friendly adsorbent for the removal of dyes from wastewater.