Straw porous carbon material, preparation method thereof and application of straw porous carbon material in preparation of rice field cadmium pollution treatment material

The invention discloses a straw porous carbon material, a preparation method thereof and application of the straw porous carbon material in preparation of a rice field cadmium pollution treatment material. The porous carbon material disclosed by the invention has relatively large specific surface and cation exchange capacity, and cadmium ions can be adsorbed in pores; the rice field cadmium pollution treatment material comprises a rice field base fertilizer and a rice leaf fertilizer, the rice field base fertilizer indirectly changes the bio-availability of trace elements and cadmium in rice rhizosphere soil in the rice growth process, the exchangeable state content of cadmium is affected, a reduction effect is generated, and cadmium toxicity is reduced; meanwhile, by applying the rice leaf fertilizer in a matched mode, cadmium in plants can be well prevented from being transferred into grains, the risk that cadmium exceeds the standard is reduced while the rice yield is guaranteed, and the method has importa