<span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Biosorption of Zn (II) from aqueous solution by <i style="mso-bidi-font-style:normal">jatropha curcas</i> press cake</span>

Abstract

<span style="letter-spacing:-.1pt;mso-bidi-font-style: italic" lang="EN-GB">Biosorption of Zn (II) from aqueous solution using <i style="mso-bidi-font-style:normal">Jatropha curcas</i> press cake was comparatively investigated over a range of variables (contact time, pH, and initial metal concentration) by batch adsorption experiments. Highest Zn (II) removal (~40 mg/L) was attained using 0.5g adsorbent for 100 minutes with initial Zn (II) concentration of 50 mg/L and pH 4. The adsorption data was best fitted with Langmuir isotherm (R² = 0.99) and follows second order kinetic rate equation (R²> 0.99). FTIR analysis revealed the availability of phenol, alcohol and carboxyl functional groups in <i>Jatropha curcas</i> press cake for the biosorption. XRD results confirmed the presence of Zn (II) in the press cake after adsorption process. These findings concluded that <i style="mso-bidi-font-style:normal">Jatropha curcas</i> press cake is a suitable biosorbent for removing Zn (II) in heavy metal polluted wastewater.

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