Fatai Alade AderibigbeTunmise Latifat AdewoyeSherif Ishola MustaphaIshaq Alhassan MohammedHarvis Bamidele SakaMutiu Kolade AmosaAyoade Lateef AdejumoRasheed Uthman OwolabiShalom Boluwatife James2025-04-302025-04-302021-09-21Green synthesis; Magnesium oxide; Mixed oxide; Phenol; Process wastewater; Titanium oxide.DOI:10.36909/jer.13917https://uilspace.unilorin.edu.ng/handle/123456789/15771Mixed solid oxides are known for their excellent catalytic property and applications in environmental remediation. This study presents a green-synthesis route for magnesium oxide–titanium oxide, a mixed oxide demonstrated to possess high performance of phenol removal from hydrocarbon refinery process wastewater. Mixed oxide (MgO-TiO2) was prepared by using the whole extract from leaves of Piliostigma Thonningii as a reducing agent. A structural attribute of the mixed oxide was investigated using X-ray Diffractometer, High Resolution Scanning Electronic Microscopy and Energy Dispersive X-ray. Petroleum refinery raw wastewater having a phenol concentration of 19.961 mg/L was treated using green-synthesized mixed oxide. Adsorptive phenols removal up to 99.5% was achieved with a dosage of 0.04 g/100 mL at a temperature of 35 °C, and a contact time of 1.167 h. By this, the treated water meets the standard acceptable phenol concentration (0.1 mg/L) in wastewater of hydrocarbon refinery. Keywords: Green synthesis; Magnesium oxide; Mixed oxide; Phenol; Process wastewater; Titanium oxide.enArticle