The methylene blue adsorption value can basically reflect the mesoporous adsorption capacity above 2nm in the activated carbon of Lianyungang sewage treatment, and the iodine adsorption value can basically reflect the adsorption capacity of micropores below 2nm. The results showed that phenolic resin was mainly polymerized in large and medium pores, and had low polymerization degree in micropores, poor thermal stability, easy decomposition and volatilization at high temperature, so the iodine adsorption value increased rapidly. The iodine adsorption value of the sample obtained after phenolic resin polymerization on coconut shell carbon and treated at 900℃ was higher than that of the original carbon. First, the micropores of the activated carbon in the original carbon and coconut shell were basically exposed.

When phenolic resin was polymerized on coconut shell activated carbon, the adsorption values of methylene blue and iodine were not detected, indicating that phenolic resin had been filled in the pores. After carbonization at 800, 850 and 900℃ for 1h, the carbonization temperature increases.

The carbonization of phenolic resin can form some micropores, and the second is that the large pores are shrunk by phenolic resin, resulting in some new micropores. When the temperature further increased to 1000℃, the methyl blue value of 120mg/g exceeded the initial activated carbon, and the yield decreased to 65%. The results show that when the carbonization temperature is too high, the amorphous carbon formed by the carbonization of the polymer filled in the large pores is completely ablated, and the wall collapse of some micropores also leads to the increase of large pores.

The iodine adsorption value of coconut shell activated carbon recovered rapidly, and the iodine adsorption value of the sample carbonized at 900℃ exceeded the initial raw carbon coconut shell activated carbon, reaching 1087.9mg /g, while the methylene blue adsorption value was only 50% of the yield of coconut shell activated carbon.