Coriandrum sativum seeds as a green low-cost biosorbent for crystal violet dye removal from wastewater.

Current study focused on Coriandrum sativum seeds as a green low-cost biosorbent for crystal violet dye removal from wastewater. Adsorption parameters (such as pH, adsorbent dosage, contact time, adsorbate concentration, and temperature), isotherm models (i.e., Langmuir, Freundlich, and Dubinin--Radushkevich isotherm models), kinetic models (i.e., pseudo-first-order, pseudo-secondorder, and intraparticle diffusion models), and thermodynamics study has been studied and investigated. At optimized conditions, that is, pH 7, adsorbent dose of 0.3 g, contact time 50 min, dye concentration of 30 ppm, and 10°C temperature, the maximum dye removal was 75%. Experimental data fitted best to Freundlich isotherm and pseudo-second-order kinetic model. Computed ΔG and ΔH values adjusted adsorption process to be spontaneous and exothermic in nature. Maximum adsorption capacity in current process was found to be 1.8098 mg/g and applicability of established practice with tap water was 72% and regeneration study showed that nearly 71% of adsorbent (Coriandrum sativum seeds) was recovered which confirmed the effectiveness of Coriandrum sativum seeds for decontamination of crystal violet dye. [ABSTRACT FROM AUTHOR]