A kind of humus-metal oxide composite modified electrode and its preparation and application
A technology of composite modification and humus, applied in the field of materials, can solve problems such as pollution and waste of humus, achieve low cost, improve biocompatibility, and improve performance
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[0035] The preparation method of the humic substance-metal oxide composite modified electrode provided by the invention comprises the following steps:
[0036] 1) Electrode substrate pretreatment: Clean the electrode substrate and dry it for later use.
Embodiment 1
[0055]Take 1.0g of manganese nitrate and 6.0g of citric acid to form a gel by sol-gel method. The gelation temperature is 60°C. 0.5h before the formation of the colloid, add 2.0g of humic acid and stir evenly. After the colloid was formed, the pretreated carbon cloth was soaked and dried at 40°C, and repeated once. After impregnation, it was aged at room temperature for 8 hours, and then fired at 160°C for 2 hours. The prepared humic acid-manganese oxide-based electrode was used in a bioelectrochemical system. The polycyclic aromatic hydrocarbon phenanthrene was used as a probe, and unmodified carbon cloth, manganese oxide alone, and humic acid-modified carbon cloth were used as controls. The properties of the modified electrode materials are shown in Table 1.
[0056] Table 1 Performance of different carbon cloth electrodes in bioelectrochemical systems
[0057]
[0058] From Table 1, it can be found that with ordinary carbon cloth as the matrix, under the action of humi...
Embodiment 2
[0060] Take 2.0g of ferric nitrate and 2.0g of citric acid to form a gel by sol-gel method. The gelation temperature is 70°C. 1.0h before the formation of the colloid, add 2.0g of fulvic acid and stir evenly. After the colloid is formed, the pretreated graphite rod is dipped and dried at 60°C, and repeated twice. After impregnation, it was aged at room temperature for 16 hours, and then fired at 200°C for 1.5 hours. The prepared fulvic acid-iron oxide-based electrode was used in a bioelectrochemical system, with bisphenol A as a probe, unmodified graphite rods and graphite rods modified with iron oxide and fulvic acid alone as controls, and modified The performance of the electrode material after activating is shown in Table 2.
[0061] Table 2 Performance of different graphite rod electrodes in bioelectrochemical systems
[0062]
[0063] From Table 2, it can be found that with ordinary graphite rods as the substrate, under the action of fulvic acid-iron oxide based elec...
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