Fig. 9. Comparison of the adsorption ability of CoFeNPs1 and CoFeNPs2 for six anionic azo dyes (AMR, RR-P2B, NBB, AO7, RO16 and AO52) [conditions: initial dye concentration 0.02 mmol L−1, temperature 30 °C, pH 6, and adsorbent dose 0.67 g L−1].
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