Phosphate removal by lead-exhausted bioadsorbents simultaneously achieving lead stabilization.
作者： Shunli Wan , Jiayu Wu , Feng He , Shanshan Zhou , Rui Wang
DOI: 10.1016/J.CHEMOSPHERE.2016.10.142
关键词: Manganese 、 Equilibrium time 、 Chemistry 、 Sorption 、 Metal 、 Adsorption 、 Ion strength 、 Ph range 、 Phosphate 、 Inorganic chemistry
摘要: Low-cost adsorbents have been continuously developed for heavy metal removal, but little information is available concerning the follow-up treatment of toxic metal-laden adsorbents. In this study, an optional strategy was provided further metal-impregnated low-cost through employing them phosphate retention. The enhancement adsorption by sorbed lead first validated using several types raw or modified waste biomass. Tea waste-supported hydrated manganese dioxide (HMO-TW) with highest Pb sorption capability then chosen to systematically evaluate Phosphate onto lead-laden HMO-TW (HMO-TW(Pb)) pH-insensitive only slight decline at pH > 8.5, and barely affected competing anions owing specific surface precipitation mechanism. Moreover, no signs leakage from HMO-TW(Pb) were observed during a wide pH range (4.2–11.3) high ion strength (0–250 mg L−1 NaNO3). on greatly stabilized retention, which also reduced environmental risks their following such as solidification landfill. Additionally, quick (with equilibrium time <60 min) temperature. Fixed-bed column test suggested that has practical applicability in efficient removal water.
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