Abstract
We found that steel slag, the residue of steel manufacturing, had high NH4+-N absorptive capacity. Thus, it has the potential to be a high-efficiency and low-cost adsorbent for NH4+-N removal from pollutant water. We investigated the kinetics and isotherms of the NH4+-N adsorption by steel slag. Experimental results showed that NH4+-N absorptive capacity of steel slag was directly related to NH4+-N concentration, shaking rate, and particle size of steel slag. When NH4+-N ≤ 50 mg/L or the shaking rate ≤ 150 rpm, external diffusion of NH4+-N could be promoted. When the particle size of steel slag ≥ 3–5 mm, intra-particle diffusion of NH4+-N became controlling step. Boyd and Kannan equations illustrated that both of intra-particle and external diffusions were key influence factors of NH4+-N adsorption, but only one played key role in some particular condition. The adsorption followed pseudo-second-order kinetics. Langmuir and Freundlich models obeyed to fit well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 0.84 mg NH4+-N/g steel slag, and Freundlich models showed the adsorption is preferential type.
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