期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 14, 页码 14043-14056出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1461-0
关键词
Lead removal; Nanoparticles; Clinoptilolite; RSM; Ethylenediaminetetraacetic acid; Experimental design
An efficient Pb(II) adsorbent was prepared by the modification of clinoptilolite nanoparticles (CpN) with ethylenediaminetetraacetic acid (EDTA). Samples were characterized by XRD, FT-IR, SEM, BET, TG-DTG, CHNS analyzer, and energy dispersive analysis X-ray spectroscopy (EDX). The experiments were designed by response surface methodology (RSM) based on central composite design (CCD) that suggested a quadratic model to predict the conditions and the interactions between the variables including adsorbent dosage, removal time, C-pb, and its solution pH. Adequacy of the suggested quadratic model was judged by ANOVA. The maximum Pb(II) removal of 0.27 mmol(pb(II))/g(ads) was achieved in optimal run including adsorbent dosage 2 g L(-1)removal time 271 min, C(pb)22.51 mmol L-1, and Pb(II) solution pH 5.88. In binary metal cation systems including 1000 mg L-1 with respect to both Pb(II) and interfering cations, good selectivity of CpN-EDTA adsorbent was observed towards Pb(II) among the tested cations except Fe(III). Adsorption isotherm of lead removal by the adsorbent was well modeled by Langmuir equation, indicating a monolayer sorption of Pb(II) onto the adsorbent. The pseudo-second-order rate equation, indicating chemical reaction rate limiting step for the process, well modeled the kinetic of the process. An exothermic and spontaneous process was confirmed by the negative Delta H and Delta G.
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