Bamboo chars and bamboo activated carbons prepared by steam activation were applied for ink wastewater treatment. Bamboo char at 800 °C was the best for the removal of color and chemical oxygen demand (COD) from ink wastewater compared to bamboo chars at 300 to 700 °C due to higher surface area and mesopore volume. Bamboo activated carbon at 600 °C (S600) was the best compared to bamboo activated carbon at 800 °C (S800), although S800 had larger surface area (1108 m(2)/g) than S600 (734 m(2)/g). S600 had higher mesopore volume (0.20 cm(3)/g) than S800 (0.16 cm(3)/g) and therefore achieved higher color and COD removal. All bamboo activated carbons showed higher color and COD removal efficiency than commercial activated carbon. In addition, S600 had the superior adsorption capacity for methylene blue (0.89 mmol/g). Therefore, bamboo is a suitable material to prepare adsorbents for removal of organic pollutants.

2/g, 1.54 cm 3 /g and 6.0 nm, respectively. The dye adsorption experiments were carried out through a batch test to evaluate each prepared activated carbon. Methylene blue and direct blue 71 were chosen as adsorbates. ZnCl2 activated carbons had the better adsorption capacity for methylene blue compared to H3PO4 activated carbons, which were not well-suited for the methylene blue adsorption probably due to their smaller SBET and positive charge on surface. The most mesoporous sample had the largest amount of direct blue 71 adsorption (0.97 mmol/g) among the all samples, suggesting that the prepared mesoporous activated carbons would be a valuable material for the removal of bulky dyes.

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