Abstract
In this work, chrome-tanned leather waste were activated with sodium hydroxide (NaOH) to prepare a porous adsorbent for lead (II) adsorption. The effects of various preparation parameters like the concentration of NaOH, the size of leather particles, the activation time and the activation temperature were studied. Under optimum preparation condition, the alkali-activated porous leather particles (AAPLP) were obtained after vacuum freeze-drying. AAPLP was characterized with BET, SEM, FT-IR, TG and XPS. It was found that the BET surface of AAPLP was twice more than unactivated leather waste. Additionally, it could be inferred that ion-exchange and complexation happened during the adsorption process between AAPLP and lead (II). The effects of solution pH, temperature and contact time on adsorption capacity of AAPLP for lead (II) have also been investigated. The experiment data was fitted well with Freundlich isotherm and followed pseudo-second-order kinetics. Meanwhile, the kinetic data was governed by intraparticle diffusion model and it was found that the adsorption process contained three stages.
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