Cocl2 6h2o

KMnO₄, MnSO₄•H₂O, CoCl₂•6H₂O, diethyl ether, paraffin, and distilled water were purchased from Beijing Chemical Works. All chemicals were analytical grade.
Synthesis of Cryp and Co-Cryp The Cryp samples were produced by the following procedures: 100 mL of 0.1 M KMnO₄ and 50 mL of 0.3 M MnSO₄•H₂O were mixed at room temperature under vigorous stirring for 30 min. Gradually formed brwon precipitates were transferred into a stainless steel autoclave lined with Teflon, and were cured at 140 °C for 24 h. After been being cooled down to room temperature, the precipitates were filtered first, then, washed three times with distilled water and dried at 80 °C for 24 h63 .
The Co-Cryp samples were produced similarly with different quantities of CoCl₂•6H₂O added to the MnSO₄•H₂O solution before being mixed with the KMnO₄ solution. During the reaction, Co(II) was oxidized to Co(III) due to an excess amount of Mn(VII) with respect to the reduced amounts of Mn(II) in the reaction.

Serratia marcescens was purchased from the China Center of Industrial Culture Collection (CICC No. 21999, Shanghai, China). Glucose, CoCl₂·6H₂O, MgSO₄·7H₂O, Na₂SO₃, NaOH, and HCl were sourced from Beijing Chemical Works (Beijing, China); benzoic acid, zirconium oxychloride octahydrate (ZrOCl₂∙8H₂O), and tris(1-chloro-2-propyl) phosphate (TCPP) were obtained from Shanghai Aladdin Biochemical Technology Co., Ltd. (Shanghai, China). N,N′-dimethylformamide (DMF), dipotassium hydrogen phosphate, potassium dihydrogen phosphate, and disodium hydrogen phosphate were purchased from Sinopharm Chemical Reagent Co., Ltd. (Beijing, China).