The invention discloses a nano bamboo charcoal for treating air pollution by photocatalysis with high activity, which comprises the following raw materials in parts by weight: 80-100 parts of bamboo charcoal, 6-9 parts of butyl titanate, 10-15 parts of absolute ethyl alcohol and 6-9 parts of deionized water, and the preparation method comprises the following steps: s1, bamboo charcoal activation, S2 and titanium dioxide sol preparation: dropwise adding the solution A into the solution B at room temperature to prepare titanium dioxide sol, and carrying out S3, titanium dioxide infiltration, S4 and post treatment.
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