Preparation of CNTs-SA Composite Adsorbent and Adsorption of High Concentration Cr(Ⅲ)
The environment friendly composite adsorbent CNTs-SA was prepared using carbon nanotubes(CNTs) and sodium alginate(SA) as raw materials,and was characterized by TEM and FTIR.The factors affecting the adsorption of Cr(Ⅲ) on CNTs-SA were studied by static adsorption method.The characterization results show that CNTs-SA surface has more —COOH and —C＝O groups than CNTs,which greatly improve the Cr(Ⅲ) adsorption effect.The experimental results show that:Under the conditions of room temperature,initial Cr(Ⅲ) mass concentration 4 000 mg/L,CNTs-SA dosage 21 mg/ mL,solution pH 5,adsorption time 3 h and m(CNTs) ∶ V(SA)=1.0 mg/mL,the Cr(Ⅲ) adsorption capacity of CNTs-SA is 120 mg/g,and the Cr(Ⅲ) removal rate is 61.5％; The adsorption process fits well to Freundlich isotherm adsorption equation.
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