Arsenic removal from contaminated water by ultrafine 未-FeOOH adsorbents

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• 作者：M谩rcia C.S. Faria ; Renedy S. Rosemberg ; Cleide A. Bomfeti ; Douglas S. Monteiro ; Fern ; o Barbosa ; Luiz C.A. Oliveira ; Mari ; ry Rodriguez ; M谩rcio C. Pereira ; Jairo L. Rodrigues
• 关键词：Adsorption ; Iron oxides ; Environmental remediation ; Nanoparticles
• 刊名：Chemical Engineering Journal
• 出版年：1 February, 2014
• 年：2014
• 卷：237
• 期：Complete
• 页码：47-54
• 全文大小：1256 K

文摘

未-FeOOH nanoparticles were prepared by a fast, simple and cheap synthesis method for use as an adsorbent for As(V) in water. Rietveld refinement on XRD pattern confirmed that 未-FeOOH was successful synthesized. TEM images evidenced that the average particle sizes for 未-FeOOH is 20 nm, which provided a high surface area of 135 m² g^鈭? and average pore sizes of 18 nm, as verified with BET measurements. Zeta potential revealed that the point of zero charge of 未-FeOOH is 8.4, which favored the As(V) adsorption on the 未-FeOOH surface even at neutral pH. The As(V) adsorption capacity of 未-FeOOH was estimated to be 37.3 mg g^鈭? at pH 7. The kinetics data were best fitted with a pseudo-second order, thus suggesting chemical adsorption on the surface and pores of 未-FeOOH nanoparticles. The interaction between As(V) and 未-FeOOH nanoparticles was suggested to be mainly inner sphere complexes. The adsorption isotherm obtained at pH 7 was best fitted to the Langmuir and Redlich-Peterson models and, therefore, a non-ideal monolayer adsorption model for As(V) on 未-FeOOH nanoparticles was proposed. The small particle size, high surface area and adsorption capacity make 未-FeOOH a promising adsorbent for toxic metals in contaminated water.