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Biochar colloids and their use in contaminants removal

Biochar 2019年第2期1卷 151-162页

作者： Salman Safari Konstantin von Gunten MdSamrat Alam Magdalena Hubmann tamzin ablewett Ziyi Chi Daniel SAlessi Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E3Canada Department of Agricultural Foodand Nutritional ScienceUniversity of AlbertaEdmontonAlberta T6G 2P5Canada Department of Biological Sciences University of AlbertaEdmontonAlberta T6G 2E0Canada School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghaiChina

In this study, we report on the extraction, characterization, and potential applications of colloidal biochar derived from pyrolyzed wood-an untapped source of carbonaceous particles.A series of characterizations was performed on biochar colloids to unravel their colloidal properties and surface chemistry through which it was found that they have a net negative charge and are stable between pH 3 and ***,our initial toxicity tests showed that biochar colloids themselves are not toxic and they can be used in remediation applications,which led us to investigate(1)their copper sorption,a model inorganic contaminant,in a scenario that biochar colloids are released into the environment and(2)their potential use in organic pollutants adsorption and *** sorption studies showed that biochar colloids have a copper sorption capacity as high as 22 mg g^(−1) in sub-ppm copper *** increased the acute 48 h lethal concentration(LC50)of copper for Daphnia magna by 21 ppb,which is comparable to the previously reported effect by dissolved organic *** and degradation of methylene blue(MB),an often-used proxy for organic contaminants in water,were studied by coupling the biochar colloids to positively charged TiO_(2) nanoparticles and using it as a *** hybrid MB photodegradation efficiency was 21%higher than that of TiO_(2) nanoparticles *** of demethylation is proposed as the main degradation mechanism of MB,as confirmed by liquid chromatography-mass spectroscopy(LC/MS),and the positive impact of biochar colloids is ascribed to their abundant adsorption sites,which may facilitate MB adsorption and its photocatalytic degradation.

关键词： Biochar Colloids Contaminants Photocatalysis Water treatment

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