Puangrat Kajitvichyanukul, Kanittha Daramuang, and Apichon Watcharenwong

pp. 47 - 53

Abstract

In this work various experimental conditions to extract chromium from titanium dioxide surface
using acid and alkali reagents were studied. The effect of type of reagents, concentration of reagents and
solid-liquid ratio were investigated. It was found that the chromium extraction using acid reagent provided
the higher recovery efficiency than that using alkali reagent. The maximum achievable of chromium
extraction (100%) can be found in many experimental conditions using either nitric or sulfuric acids as
extraction reagents. The solid-liquid ratio also played a major role in extracting chromium in which the
extraction of chromium increased with decreasing solid-liquid ratio. The results also showed that percentage
of chromium recovery was increased with increasing of nitric concentration. On the contrary, this maximum
recovery percentage was reduced with the rising of sulfuric concentration. Findings from this study could
also provide the beneficial information for extraction of other heavy metals from titanium dioxide surface.