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Effect of adsorption contact time on removal efficiency of metals from sludge suspension using MNPs@SiO2@GOPTS-Lys at fixed conditions: nanoadsorbent amount 10 mg, pH 10.7, 2 wt% sludge suspension at T = 298 K (a). Fitting of pseudo-first-order (b), pseudo-second-order (c) and intra-particle diffusion model (d) for Cr, Cu and Zn by simultaneous removal from sludge suspension
