Method of preparing FeMnCeOx biomaterial and method of treating antibiotic wastewater

A method of preparing a FeMnCeOx biomaterial, comprising:

• obtaining a KW-2 strain, wherein the KW-2 strain is Pseudomonas sp. strain KW-2 with a national center for biotechnology information (NCBI) accession number of OM763989;
• preparing a culture medium, wherein the culture medium comprises 0.1 g/L K2HPO4, 0.2 g/L MnSO4·7H2O, 0.2 g/L NaNO3, 0.1 g/L CaCl2, 0.1 g/L NH4Cl, 0.1 g/L (NH4)2CO3, 35 g/L NaCl and 150 mg/L ferric ammonium citrate;
• and a pH of the culture medium is 6.5-7.8;
• autoclaving the culture medium;
• inoculating the KW-2 strain into the culture medium followed by a first culture for 1-3 days, wherein the KW-2 strain is 2-10% by volume of the culture medium;
• and adding a cerium nitrate solution into the culture medium followed by a second culture for 3-7 days and centrifugation at 4,000-8,000 rpm for 10-20 min to collect a precipitate;
• and
• rinsing the first precipitate 5-8 times with deionized water and a 0.01 mol/L phosphate buffered saline (PBS) followed by freeze-drying at −60° C. to obtain the FeMnCeOx biomaterial.