Evaluation of removal efficiency of Fe(III) and Al(III) ions in acid sulfate water using agarose-based magnesium oxide composite

Ngoc Xuan Dat Mai^{1, 2}, Tan Le-Hoang Doan^{1, 2}, Le Nguyen Bao Thu^{2, 3}, Bach Thang Phan^{1, 2*}

¹Center for Innovative Materials and Architectures (INOMAR), Vietnam National University, Ho Chi Minh city

²Vietnam National University, Ho Chi Minh city

³Department of Mathematics and Physics, University of Information Technology, Vietnam National University, Ho Chi Minh city

Received 1 April 2020; accepted 30 June 2020

 

Abstract:

Agarose/MgO composite adsorbents were developed through interspersing MgO nanoparticles with agarose to create an absorbent. The elimination capacity of the composite towards iron (Fe), aluminium (Al), and arsenate (As) in acid sulfate water was evaluated by means of batch method at room temperature. The constituents of the composite were characterized by thermal gravimetric analysis (TGA). The removal efficiency was determined through inductively coupled plasma (ICP) mass spectrometry. The composite adsorbent exhibited an excellent adsorption capacity towards three types of ions and heavy metals that are found in acid sulfate water. After treating with agarose/MgO, the concentrations of Fe and Al decreased from 60.28 µg/l and 604.84 µg/l, respectively, to under 3.42 µg/l and 1.78 µg/l, respectively. These exceptional results reveal the potential uses of agarose/MgO composites as adsorbents in the treatment of acid sulfate water.

Keywords: acid sulfate water, agarose composite, MgO adsorption, treatment.

Classification number: 2.3