Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Materials Research

Katiane Cruz Magalhães Xavier¹  Maria Do Socorro Ferreira Dos Santos²  Maria Rita Morais Chaves Santos¹  Marilia Evelyn Rodrigues Oliveira¹  Maria Wilma Nunes Cordeiro Carvalho²  Josy Antevelli Osajima¹  Edson Cavalcanti Da Silva Filho¹ 

[1] ,Federal University of Piauí Natural Science Center Interdisciplinary Laboratory of Advanced MaterialsTeresina PI ,Brazil

关键词: Palygorskite clay;    acid-activation;    characterization;   

DOI  :  10.1590/S1516-14392014005000057

来源: SciELO

【 摘 要 】

The palygorskite is an aluminum-magnesium silicate that has a fibrous morphology. Their physico-chemical characteristics are the result of high surface area, porosity and thermal resistance which make it an attractive adsorbent. Its adsorption capacity can be increased through chemical reactions and/or heat treatments. The objective of this work is to verify the effects of acid activation on the palygorskite, treated with HCl at 90 ºC at concentrations of 2, 4 and 6 mol L-1 in 2 and 4 hours, with clay/acid solution ratio 1 g 10 mL-1 and characterized by techniques: XRF, XRD and surface area. A significant increase in specific surface area was observed in the sample treated with HCl at the concentration 6 mol L-1. The changes were more pronounced at stricter concentrations of acidity, with decreasing intensity of reflection of the clay indicated in the XRD. These changes were confirmed in the XRF with the leaching of some oxides and with increasing concentration of SiO2.

【 授权许可】

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