Synthesis of Soybean Hull and Dolomite Biochar Composite (CaMg(CO3)2) as Phosphorus Adsorbent in Water
Dina Wahyu Indriani1,2, Stella Jovita1, Holilah Holilah3, Hendrix Yulis Setiawan4, Yatim Lailun Ni^Mah1, Didik Prasetyoko1*

1Department of Chemistry, Faculty of Science and Analytical Data, Institut Teknologi Sepuluh Nopember, Jl. Arif Rahman Hakim, Kampus ITS Keputih-Sukolilo, Surabaya, 60111, Indonesia.
2Department of Bioprocess Engineering, Faculty of Agricultural Technology, Universitas Brawijaya, Jalan Veteran Malang, 65144, Indonesia
3Research Center for Biomass and Bioproducts, National Research and Innovation Agency of Indonesia (BRIN), Cibinong, 16911, Indonesia
4Department of Agroindustrial Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Jalan Veteran Malang, 65144, Indonesia

Abstract

Researchers have developed innovative, cost-effective methods to recover and treat phosphate from wastewater in order to combat the issue of eutrophication, which is brought on by phosphorus in water and the shortage of phosphate rock reserves in ecosystems. Utilizing co-pyrolysis to create a biochar composite, this material can be valued using that process. An ideal biochar composite that may be utilized as an adsorbent to solve environmental issues like water pollution is what this pyrolysis process seeks to achieve. In addition, by utilizing pyrolysis treatment at 400, 600, and 800 degrees Celsius to combine agricultural waste (soybean and cassava waste) with a dolomite composite basis, this research is helpful in learning about new composite materials. The FTIR analysis shows that function group that appear was O-H, C=C, asymmetric stretching of CO_3^(2-), Mg-O stretching, stretching symmetric vs Ca-O-Ca, Mg and in plane bending CO_3^(2-). This also show in XPS analysis that the energy bending 284.75eV were found at the C-O functional group. Phosphate 1st peak at 132 eV indicated that the adsorption process on the composite biochar was already appears at composite biochar.

Keywords: dolomite- phosphate adsorption- soybean hull- surface modifications

Topic: Waste and environmental management