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As interest in environmental pollution has increased, research in the field of filtration has been concentrated. While varioustypes of filters have been developed, research on nanomaterial filtration has been limited. Since then, the development ofnew materials such as carbon nanotubes (CNTs) has accelerated the study of new filters. Especially, CNTs have been amongthe most attractive materials ever synthesized for the development of nano-technologies. However, there are fundamentaltechnical problems to be solved the development of new CNT composites. One of these problems is the development of aCNTs filter with excellent adsorption behavior and a filter that is capable of filtering a specific substance. In addition, itis necessary to develop a technology to increase the uniform distribution of CNTs, and to reduce the high processing costof CNT composite production. In general, the chemical pathways for the production of CNTs include hydrocarbon gases,such as methane (CH4) and acetylene (C2H2), through metal nanoparticle catalysts. However, nano-metal particles have astrong coagulation phenomenon at high temperature by catalytic chemical vapor deposition (CCVD) method. In this review,attempts were made by applying three different reaction techniques to form CNTs on biomorphic carbon materials (BCM)coated with catalyst materials to control the shape and size of CNTs. Hierarchical carbon substrates with pore size of100 ~ 300 μm were developed using carbonization reaction. Linde type A (LTA) zeolite, silicalite-1, and mesoporous SiO2template crystals were simultaneously synthesized and coated on the BCM by an in-situ hydrothermal process to synthesizehigh-yield CNTs composites.
