The effect of initial solution pH on Cr (VI) removal by EMCMCR is shown in Fig. 4.
The adsorption of Cr (VI) increased with pH increasing from 1.0 to 2.0.
The results indicated that at pH 2.0, the maximum adsorption capacity of 2.00, 11.88, 19.76mgg−1 occurred at an initial Cr (VI) concentration of 10, 60 and 100mgL−1, respectively.
Within the range of pH values from 2.0 to 8.0, the adsorption capacity decreased drastically with increasing of pH.
This indicates that the adsorption of the adsorbent is clearly pH dependent.
Similar trend was also observed with the removal of hexavalent chromium using chitosan derivatives, while some researchers have reported the different optimum pH on adsorption of heavy metals by using different kind of modified chitosan.
For example, the adsorption of Cr (VI) on CMCB and CMCF was pH dependent and maximum adsorption was obtained at pH 3.0.
The maximum adsorption capacity of the resin QCS for Cr (VI) occurred at a pH value of around 3.5–4.5
The effect of initial solution pH on Cr (VI) removal by EMCMCR is shown in Fig. 4.
The adsorption of Cr (VI) increased with pH increasing from 1.0 to 2.0.
The results indicated that at pH 2.0, the maximum adsorption capacity of 2.00, 11.88, 19.76mgg−1 occurred at an initial Cr (VI) concentration of 10, 60 and 100mgL−1, respectively.
Within the range of pH values from 2.0 to 8.0, the adsorption capacity decreased drastically with increasing of pH.
This indicates that the adsorption of the adsorbent is clearly pH dependent.
Similar trend was also observed with the removal of hexavalent chromium using chitosan derivatives, while some researchers have reported the different optimum pH on adsorption of heavy metals by using different kind of modified chitosan.
For example, the adsorption of Cr (VI) on CMCB and CMCF was pH dependent and maximum adsorption was obtained at pH 3.0.
The maximum adsorption capacity of the resin QCS for Cr (VI) occurred at a pH value of around 3.5–4.5
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