adsorption; coconut coal; coagulants; flocculants; iron; manganese.


In this work, a comprehensive comparative study of adsorbents obtained by combining coconut coal with coagulants based on aluminium salts (Al2(SO4)3 and AlCl3) and flocculants (sodium alginate and chitosan) was obtained and carried out for the removal of iron and manganese ions from model solutions. Adsorbents based on coconut coal and flocculants were obtained by the impregnation method followed by drying at a temperature of 50 °C for 6 hours (КАУ+Х1, КАУ+Х2 and КАУ+АН). Adsorbents based on coconut coal and coagulants were produced by adding aluminum salts to an aqueous solution of urea at a temperature of 95 °C with intensive stirring for 30 minutes using coconut coal (КАУ+ AlC КАУ+AlS). The adsorbents were tested for their ability to remove iron and manganese ions from water systems. The comparative characteristics were based on the results of the adsorption kinetics study. It was found that the most effective adsorbent for removing iron and manganese ions is based on coconut coal and sodium alginate flocculant (КАУ+АН), in comparison with coconut coal alone. The recommended contact duration for the adsorbent and adsorbate is 60 minutes. This duration achieves an effective degree of purification for ferric ions (82.5 %) and manganese ions (84.65 %). Compared to КАУ coconut coal and other studied adsorbents, the purification rates for iron ions and manganese ions are 7–15 % and 18–20 % higher, respectively. The study determined that the optimal dose of КАУ+АН adsorbent is 5 g/dm3. The advantages of this adsorbent, which is characterized by a high degree of extraction of iron and manganese ions in static conditions and can be recommended for cleaning aqueous solutions and further research in dynamic conditions, are given.


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