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2 CHAPTER TWO

3.4 Conclusions

In this study, DMI-65 which is a silica based catalytic media was used to investigate the feasibility of removing As (III) and As (V) from synthetic water in a batch experiment. Activating the DMI-65 revealed an increase in the surface area, pore volume and pore size. The kinetics of the experimental data for removing As (III) and As (V) fitted with the pseudo second-order model and equilibrium was reached after 5 h and 6 h for As (III) and As (V) removal respectively. The pH of the arsenic solution had little effect on the removal efficiency and adsorption capability. The maximum removal efficiency for As (III) was 96.55 % at pH 5 and 90.40 % for As (V) at pH 8.5. The results of adsorption isotherms are best fitted to Langmuir model which shows that the maximum adsorption capacity of As (III) and As (V) to be 0.315 mg/g and 0.224 mg/g respectively. Thermodynamic parameters show that the adsorption process for As (III) and As (V) is a spontaneous process. The positive values for ΔSo and ΔHo for both As (III) and As (V) indicate an increased

0 20 40 60 80 100

0 1 2 3 4 5

As (III)/As (V) removal %

No of Cycles As (III) As (V)

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randomness at the solid/liquid interface and the endothermic nature of the adsorption process respectively. The regeneration studies showed that DMI-65 can be regenerated using NaOH solution and reused for several cycles.

DMI-65 was primarily designed to remove iron and manganese in drinking water.

The level of As (III) and As (V) in this study was reduced from a high of 0.06 mg/L to 0.0058 mg/L for As (V) at pH 5 and from 0.06 mg/L to 0.0016 mg/L for As (III) at pH 5. These values are below the level recommended by WHO, US EPA and DWSNZ (10 µg/L). Furthermore, DMI-65 operates over a wide pH range thereby making it potentially suitable for removing arsenic in drinking water.

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