Effect of deashing on activation process and lead adsorption capacities of sludge-based biochar.

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ID: 93293
2020
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Abstract
To explore the effect of inorganic minerals on activation process and lead adsorption of sludge-based biochar, sludge-based biochar was pre-deashed using hydrochloric acid or hydrofluoric acid followed by potassium acetate activation. The results indicate that hydrochloric or hydrofluoric acid deashing can improve the pore parameters of sludge-based biochars and promote subsequent activation effect of potassium acetate. The specific surface area of biochar activated by potassium acetate after hydrochloric acid and hydrofluoric acid pretreatment increased from 583.36 m/g to 718.70 m/g and 991.55 m/g, respectively. The enhancement of pore structure is conducive to enhancing the physical adsorption of lead on sludge-based biochar, while the chemical adsorption is not significantly affected at the same time. Thereby, the biochar and activated biochar pretreated with hydrofluoric acid showed better lead adsorption capacities (16.70 and 49.47 mg/g) than untreated biochar (7.56 and 38.49 mg/g).
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zhang2020effectthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Junjie;Shao, Jingai;Jin, Qianzheng;Zhang, Xiong;Yang, Haiping;Chen, Yingquan;Zhang, Shihong;Chen, Hanping;
Journal The Science of the total environment
Year 2020
DOI
S0048-9697(20)30526-X
URL
Keywords
biochar sludge deashing lead adsorption

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