Method of preparing FeMnCeO
A method of preparing a FeMnCeO x biomaterial is provided, including the following steps. A Pseudomonas sp. strain KW-2 is obtained. A culture medium with a pH of 6.5-7.8 is prepared, which includes 0.1 g/L K 2 HPO 4 , 0.2 g/L MnSO 4 ·7H 2 O, 0.2 g/L NaNO 3 , 0.1 g/L CaCl 2 ), 0.1 g/L NH 4 Cl, 0.1 g/L (NH 4 ) 2 CO 3 , 35 g/L NaCl and 150 mg/L ferric ammonium citrate. The culture medium is autoclaved, inoculated with the KW-2 strain, cultured for 1-3 days, added with a cerium nitrate solution, cultured for 3-7 days and centrifuged at 4,000-8,000 rpm for 10-20 min to collect a precipitate. The precipitate is rinsed 5-8 times with deionized water and 0.01 mol/L phosphate buffered saline (PBS) and freeze-dried at −60° C. to obtain the FeMnCeO x biomaterial. A method for treating antibiotic wastewater using the FeMnCeO x biomaterial is also provided.
1 . A method of preparing a FeMnCeO x 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 K 2 HPO 4 , 0.2 g/L MnSO 4 ·7H 2 O, 0.2 g/L NaNO 3 , 0.1 g/L CaCl 2 , 0.1 g/L NH 4 Cl, 0.1 g/L (NH 4 ) 2 CO 3 , 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 FeMnCeO x biomaterial.
2 . The method of claim 1 , wherein during preparation of the culture medium, a MnSO 4 ·7H 2 O solution is added, and a concentration of divalent manganese ions in the MnSO 4 ·7H 2 O solution is 20-140 mg/L.
3 . The method of claim 1 , wherein during preparation of the culture medium, a ferric ammonium citrate solution is added, and a concentration of ferric ions in the ferric ammonium citrate solution is 50-180 mg/L.
4 . The method of claim 1 , wherein a concentration of cerium ions in the cerium nitrate solution is 5-50 mg/L.
5 . The method of claim 1 , wherein the culture medium is autoclaved at 121° C. for 15 min; and the first culture is performed at a rotation speed of 130 rpm and 25° C.
6 . A method for treating an antibiotic wastewater, comprising:
preparing a FeMnCeO x biomaterial using the method of claim 1 ; and
adding the FeMnCeO x biomaterial and a permonosulphate (PMS) into the antibiotic wastewater; and adjusting pH of the antibiotic wastewater followed by uniform mixing for degradation treatment of the antibiotic wastewater.
7 . The method of claim 6 , wherein a dosage of the FeMnCeO x biomaterial is 10-200 mg/L.
8 . The method of claim 6 , wherein a dosage of the PMS is 20-200 mg/L.
9 . The method of claim 6 , wherein the pH of the antibiotic wastewater is adjusted to 10-11 with a 0.1 mol/L sodium hydroxide solution or a 0.1 mol/L hydrochloric acid solution; and
during the degradation treatment of the antibiotic wastewater, a pH change of the antibiotic wastewater is detected every 10 min, and the pH of the antibiotic wastewater is maintained at 10-11.
10 . The method of claim 6 , wherein the antibiotic wastewater is selected from the group consisting of tetracycline wastewater, macrolide wastewater, aminoglycoside wastewater, and a combination thereof.