Adsorption of Methylene Blue Using Biomass‐Based Adsorbent <i>Nyctanthes Arbor‐tristis Linn</i> Leaf Powder (NATLP)

Abstract The disposal of organic dyes without further treatment causes several threats to the men and animals. The present study is emphasized for adsorption of cationic dye, methylene blue (MB), onto the biomass Nyctanthes arbor‐tristis Linn (NAT) leaves powder (NATLP) from aqueous solution of MB in batch adsorption experiments. The parameters of this experiment are effects of contact time, pH of aqueous solution of MB dye, NATLP dosages, and initial MB dye concentration etc. The characterizations of NATLP are SEM‐EDX, FTIR, CHNS, zeta potential, TGA, BET surface area, etc. The isotherm models Langmuir, Freundlich, and Temkin are the best‐fitted models for the adsorption of MB onto NATLP. The uptake capacity of 9.86 mg/g for an initial concentration of 40 mg/L MB at 20 min of the adsorption process indicates the high degree of affinity of NATLP for the adsorption of MB dye particles. The maximum monolayer adsorption capacity is 125.0 mg/g of 5 mg/L of MB solution onto 0.1 g/L of NATLP. The kinetics of adsorption follows the pseudo‐second‐order. Thus, NATLP could be altered to a potential bio adsorbent to remove MB from wastewater solutions.