Abstract:
The Mn-Fe layered double hydroxide using chloride in the interlayer anion was successfully
synthesized using chemical co-precipitation methods. The Mn-Fe LDH was then applied as
adsorbent for arsenic removal from synthetic acid mine drainage. The adsorbent
characterizations of SEM and XRD analysis showed that the Mn-Fe LDH had many different
functional groups and a high specific surface area for the adsorption processes. The
morphological structure of Mn-Fe LDH by the SEM-EDS analysis method shows a round
shape structure with a particle size of about 1 μm, and the XRF analysis method shows that
the Mn and Fe elements dominate more than other components. Batch adsorption
experimental conducted using the Mn-Fe LDH with the interlayer anion of chloride as an
adsorbent to study the effect of contact time, equilibrium pH, and temperature on the arsenic
removal. The Mn-Fe LDH showed high adsorption uptake capacity and selectivity for the arsenic
in the synthetic acid mine drainage. The adsorption and ion exchange between interlayer
chloride anions in Mn-Fe LDH and As (V) solution was the main adsorption mechanism.
Therefore, the Mn-Fe LDH can be used as an adsorbent in water and wastewater treatment. In
contrast, this research has the potential to be processed and developed into advanced materials.
Keywords: adsorption, acid mine drainage, co-precipitation, Mn-Fe LDH, wastewater treatment
