Effect of pH CaCl2 solution on graphene oxide encapsulated alginate (GO-AL) for removing methylene blue dyes

The industry waste pollution is unseparated issue in era of globalization. It’s caused in industry didn’t apply Green Chemistry principle in their production process, so that they still use hazardous chemicals that can pollute the environment, one of them is a methylene blue dye (MB) waste. The remove dyes by the combination technique of electrochemistry and adsorption appeared to be an efficient and simple. This study aims to determine the pH optimum characterization of graphene oxide-alginate composite to degradation of methylene blue in liquid waste. Graphene oxide-alginate was prepared by encapsulation method at 2% CaCl2 (b/v) solution. The material was characterized by X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR). The XRD characterization results indicated a high 2θ peak at 10.7703 and increased d-spacing of graphite to graphene oxide. The FTIR spectra of graphene oxide-alginate shows the presence of combined adsorption of graphene oxide and alginate. This indicates that the composite GO-AL was successful synthesized. Calcium chloride solubility varies with the changes in the pH of the solution and so will be the cross-linking ability of alginate with calcium ions. The optimum value of GO-AL composite with Eco-Bio method on MB degradation was obtained in CaCl2 solution pH 3 and gave MB degradation of 93.78%.

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