Activated carbon was prepared from hazelnut shells using two steps of carbonization followed by steam activation by Khalkhali and Omidvari [197] and investigated for the adsorption of mercuric ion. It was reported that pretreatment or impregnation of prepared adsorbent with chemicals such as permanganate, dichromate, EDTA and dithizone (chelating agents), methylene blue dye, and Na2S increased the adsorption efficiency of mercuric ion from aqueous solutions. Walnut shells were used for the production of powdered activated carbon by chemical activation method using ZnCl2 as an activating agent and further investigated for Hg(II) removal from water by Zabihi et al. [198]. They reported an adsorption capacity of 151.5 mg/g for Hg(II) by prepared adsorbent. Besides these, shells from different agricultural wastes have also been explored as adsorbents for the removal of various pollutants [199], [200] and [201].
Activated carbon was prepared from hazelnut shells using two steps of carbonization followed by steam activation by Khalkhali and Omidvari [197] and investigated for the adsorption of mercuric ion. It was reported that pretreatment or impregnation of prepared adsorbent with chemicals such as permanganate, dichromate, EDTA and dithizone (chelating agents), methylene blue dye, and Na2S increased the adsorption efficiency of mercuric ion from aqueous solutions. Walnut shells were used for the production of powdered activated carbon by chemical activation method using ZnCl2 as an activating agent and further investigated for Hg(II) removal from water by Zabihi et al. [198]. They reported an adsorption capacity of 151.5 mg/g for Hg(II) by prepared adsorbent. Besides these, shells from different agricultural wastes have also been explored as adsorbents for the removal of various pollutants [199], [200] and [201].
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