Experimental study reveals ultra-fast Rhodamine B adsorption using magnesium-modified tea residue biochar, highlighting an efficient approach for organic dye removal.
In this work, porous biochar (MN-TRB 750 ) was fabricated via direct pyrolysis of tea residue (TR) and Mg(NO 3 ) 2 ·6H 2 O (MN). The as-synthesized MN-TRB 750 reached a specific surface area of 839.54 m 2 ·g -1 and an average pore size of 3.75 nm with multi-level pore architecture. MN decreased TR's carbonization temperature and promoted the aromatics extent, pore structure for the frizzly flake-like biochar. Rhodamine B (RhB) was chosen as the adsorbate to explore the removal performance of organic dyes in this study. The results indicated that the maximum adsorption capacity of RhB on MN-TRB 750 at 20 ℃ is up to 809.0 mg·g -1 with isotherms fitted well to Freundlich and Dubinin-Radushkevic models. The adsorption kinetics followed pseudo-second-order and Elovich models with an equilibrium adsorption capacity of 757.6 mg·g -1 as the initial concentration of RhB is 260 mg·L -1 . High pore filling, hydrogen bond, π-π interaction determined the adsorption of RhB onto MN-TRB 850 through a multi-active center and exothermic chemical sorption process.
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HU et al. (2024) studied this question.
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