Preparation of tungsten slag-bentonite particle adsorbent and its adsorption performance for lead ion from wastewater

Abstract

In this study, the preparation of tungsten slag-bentonite particle adsorbent was studied using orthogonal and static adsorption tests. The adsorbent was characterized, and its adsorption performance for heavy metal lead ions was clarified. The results indicate that the optimum conditions are as follows: mass ratio of tungsten slag to bentonite of 5:1, particle size of 2 mm, and sintering at 800 °C for 2 h. The adsorbent primarily consisted of granular Fe-Mn oxides with a large number of holes on its surface. When the pH value of the solution is 6, adsorbent dosage is 15 g/L, initial lead concentration is 300 mg/L and adsorption time is 200 min, the removal rate of lead in wastewater by adsorbent reaches 99.95%. The adsorption process conforms to the pseudo-second-order kinetic equation, and its adsorption isotherm conforms to the langmuir equation. The adsorption of lead belongs to the specific chemical adsorption of single molecular layer.

Keywords

tungsten slag-bentonite particle adsorbent / preparation / characterization / adsorption / lead wastewater

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