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A new adsorbent Cu-Perussian blue@Nanodiamond (Cu-PB@DND) for Cs +  removal was prepared and characterized with IR, SEM, X-ray diffraction, particle size analysis, and zeta-potential. The adsorbent consists of a core of aggregated detonation nanodiamond (DND) particles with the surface treated with Cu-PB. Cesium adsorption was studied in two modes; a co-precipitation mode and a batch mode. In the co-precipitation mode, DND, CuCl 2 , and K 4 [Fe(CN) 6 ] were added sequentially to a Cs +  solution in diluted artificial seawater. In the batch mode, adsorbent Cu-PB@DND was dispersed into a Cs +  solution with stirring. The distribution coefficient (K d ) of the co-precipitation mode was 8.8 × 10 7  (mL/g) at Cs +  6.6 ppm in 0.07% seawater. The K d  value of the batch mode was 1.3 × 10 6  (mL/g). Precipitation of Cs + -incorporated particles was complete, and post filtration was not necessary. Excess copper and iron ions were completely removed and were not detected in the supernatant. The adsorption data for Cu-PB@DND were analyzed by assuming Langmuir isotherm and a good fit was obtained with a maximum adsorption capacity Q max  of 759 mg/g. The co-precipitation method was also applied to soil-treated wastewater.

A Highly Efficient Adsorbent Cu-Perusian Blue@Nanodiamond for Cesium in Diluted Artificial Seawater and Soil-Treated Wastewater