An environmentally friendly method is proposed to isolate Co3O4 nanoparticles with high surface activity. Instead of usual organic solvents, three different natural sugars, including glycogen, sucrose, and glucose are used for the first time as templates, and water as a green solvent, is used in all the steps. The crystallite sizes of the samples are 22.61 nm, 36.22 nm, and 30.093 nm for glucose, glycogen, and sucrose templates, respectively. The adsorption-desorption isotherms for all the

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... es match with IV type, which show a strong interaction between adsorbent and adsorbed sample. The pores of compounds obtained from glucose and glycogen templates, with H4 hysteresis, are slits and conical in the case of sucrose. The pore diameters are found in the interval 1.21–1.64 nm. The result illustrates a simple method with high novelty which can produce a variety of nanoparticles with a very large surface activity that can be used in different industries.