Assessment of Miscanthus x giganteus derived biochar as copper and zinc adsorbent: Study of the effect of pyrolysis temperature, pH and hydrogen peroxide modification

JOURNAL OF CLEANER PRODUCTION

卷:162

Article

Cibati, Alessio^1,4  Foereid, Bente^2,4  Bissessur, Ajay³  Hapca, Simona^4,5 

[1] Univ KwaZulu Natal, Sch Engn, Howard Coll Campus, Durban, South Africa

[2] Norwegian Inst Bioecon Res, NIBIO, As, Norway

[3] Univ KwaZulu Natal, Sch Chem & Phys, Howard Coll Campus, Durban, South Africa

[4] Abertay Univ Dundee, SIMBIOS Ctr, Bell St, Dundee, Scotland

[5] Univ Dundee, Sch Med, Populat Hlth Sci Div, Dundee DD2 4BF, Scotland

关键词: Biochar;    Metal adsorption;    Isotherms;    Adsorbent;    Copper;    Zinc;   

DOI  :  10.1016/j.jclepro.2017.06.114

来源: Elsevier

【 摘 要 】

In this work, experimental and modelling investigations were conducted on biochars pyrolyzed at 350 degrees C and 600 degrees C, to determine the effect of pyrolysis temperature, hydrogen peroxide activation and pH on copper and zinc removal, in comparison with commercially available activated carbons. Characterization of biochars was performed by BET surface area, elemental analysis. and FTIR spectroscopy. Experiments results demonstrated that biochar pyrolyzed at 600 degrees C adsorbed both copper and zinc more efficiently than biochar pyrolyzed at 350 degrees C. Chemical activation by H2O2 increased the removal capacity of biochar pyrolyzed at 350 degrees C. All investigated biochars showed a stronger affinity for copper retention, with a maximum adsorption capacity of 15.7 mg/g while zinc was 10.4 mg/g. The best adsorption performances were obtained at pH 5 and 6. Langmuir adsorption isotherm described copper adsorption process satisfactorily, while zinc adsorption was better described by Freundlich isotherm. (C) 2017 Elsevier Ltd. All rights reserved.

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