Adsorptive removal of toxic heavy metal and dyes from wastewater by rice husk (lignocellulosic biomass) derived activated biochar: A fixed-bed column adsorption study by Md. Mahmudur Rahman, Mohd. Maniruzzaman, Nor ealam, Parvej Mahmud, Sumiya Khatun, Md. Kaowsar Hossain, Md. Ismail Hossain, Md. Hasanuzzaman, Md. Ashraful Alam, Md. Al-amin, Bijoy Chandra Ghos

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