Ropes of aligned single‐walled carbon nanotubes (SWNTs) up to 10 cm in length (see Figure) have been synthesized here by the hydrogen and argon arc discharge method. The nanotubes are characterized by SEM, TEM, and Raman scattering, and their porosity is investigated. Measurements of the properties of SWNTs can be conveniently made on these very long ropes, which should also find practical applications.

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Titania nanoparticles were anchored onto active carbon (AC) through a hydrothermal process to obtain TiO2/AC composites. The optimal TiO2 loading and hydrothermal pH were investigated. The prepared TiO2/AC composites were used as adsorbents for dibenzothiophene (DBT) from model fuel. The adsorption capacity of TiO2/AC composite in the optimal synthesis conditions has enhanced 12.4% compared with pure AC. The adsorbents were regenerated by toluene washing, and the TiO2/AC composite showed higher adsorptive capacity than AC even after three recycles. The pore structure and surface chemical proprieties of TiO2/AC composite and AC were also investigated by N2 adsorption-desorption isotherms and Beohm titration. The results indicate that the surface acidic sites of TiO2/AC may play an important role in the improved adsorption performance.