Preparation, modification and deodorization performance of MCM-41 composite corn stalk

A series of MCM-41 and corn stalk (SC) composites (SC-MCM-41) were prepared via hydrothermal method. When measured for a SC-MCM-41 with SC/MCM-41 mass ratio of 1:2, the adsorption time of H2S and CH3SH can reach 90 min and 80 min, respectively. Whereas, Cu–SC-MCM-41 with copper content of 12.3% exhibited a longer adsorption time, which was 125 min and 90 min for H2S and CH3SH, respectively. Both SC-MCM-41 and Cu–SC-MCM-41 showed a rough surface with multi-level pore structure dominated by mesopores. Within the composite, the SC and MCM-41 is chemically connected by the C–Si bonds and nitrogen-containing functional groups on the surface. The copper in the Cu–SC-MCM-41 composite mainly exists in the form of CuO and Cu2O. Following H2S and CH3SH adsorption, solid-phase products were deposited on the surface and inside of the Cu–SC-MCM-41 composite, leading to pores blockage with consequent reduction of the adsorption performance.