Preparation of wood-based N,P co-doped graphene oxide-modified carbon foam and its capacitance deionization performance
Wood-based N,P co-doped graphene oxide modified foam(N,P-GCF)was prepared by liquefaction,resinization,foaming,carbonization and CO2 activation by liquefaction,resinization,foaming,carbonization and CO2 activation.The surface morphology,crystal structure,chemical properties and hydrophilic properties of N,P-GCF were analyzed by SEM,XRD,Raman,XPS and contact angle measuring instrument,and the effects of N,P-GCF on pore structure,electrochemical properties and capacitance deionization(CDI)were ex-plored by changing the addition amount of NH4H2PO4.The results showed that after GOs modification and NH4H2PO4 doping,the pore size decreases and the disorder increases.N,P-GCF has a hierarchical pore struc-ture.When the doping amount of NH4H2PO4 was 2 g,it had the highest specific surface area of 2684.11 m2/g,total pore volume of 1.42 cm3/g and mesoporosity of 49.45％,and the mass fractions of N and P were 2.48％and 3.46％,respectively.N elements mainly exist in the form of N-5,N-6 and N-X,and P elements are mainly P-C and P-N.Compared with CF,N,P-GCF20 has excellent wettability and mechanical properties.In the three-electrode system of 1 mol·L NaCl electrolyte,the specific capacitance of N,P-GCF2.0 is 256.48 F/g at a current density of 1 A/g,and the specific capacitance retention rate is 72.51％when the current density increases to 15 A/g.Under the initial NaCl solution of 500 mg/L and the working voltage of 1.2 V,N,P-GCF2.0 had the best desalination capacity(29.97 mg/g)and salt adsorption rate(1.84 mg/(g·min)),and the retention rate of de-salination capacity was 90.12％after 10 cycles,indicating good cycling stability.
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