The surface charge of [email protected] was zero at pHZPC 7.3 (Fig, 3A). The surface charge become positive at pH 7.3.The maximum values of ?pH for [email protected] are +3.43 and -1.

64 at pH 3.3 and 9.3, respectively. Figure 3B shows that the pHf of [email protected] is little change from pH 3 to pH 9.

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Due to the buffering effect of water on the [email protected] surface, the pH measurements would only be considered in a pH range of 3-9. Figure 3C shows that the maximum of removal percentages of Br.G, To.B and Tr.B dyes are achieved at pH 8-10, 3-11 and 3-11, respectively.

Although the surface of [email protected] was positive charge at pH 85%. Due to illustrate this result, the figure 3b shows that the surface [email protected] has buffering effect from pH 3-11 therefore not repulsion occurs between the dyes and [email protected]


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