Characteristics, adsorption behaviors, Cu(II) adsorption mechanisms by cow manure biochar derived at various pyrolysis temperatures. (July 2021)

• Record Type: Journal Article
• Authors: Zhang, Peizhen; Zhang, Xiaoxiao; Yuan, Xiangru; Xie, Ruyue; Han, Lujia
• Is Part Of: Bioresource technology. Volume 331(2021)
• Publication Date: 2021-07
• Subjects: Cow manure -- Biochar -- Adsorption -- Heavy metal -- Mechanism; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125013
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: CMBC700 had the maximum Cu(II) adsorption capacity. The contribution rate of coprecipitation and cations exchange was above 90%. The relationships among T, characteristics and adsorption properties were analyzed. The regression equations of characteristics with Qt, Qcp and Qci were established. The relationship between Qt, Qcp and Qci was Qt = 0.93 Qci + 0.91 Qcp + 7.70. Abstract: With the aims of exploring the effectiveness of Cu(II) adsorption performed by cow manure biochars (CMBCs) for the treatment and recycling of livestock wastes, the physicochemical characteristics and Cu(II) adsorption behaviors of CMBCs at various pyrolysis temperatures ( T ) were analyzed. CMBCs displayed surface heterogeneity and the dominant Cu(II) adsorption reactions were chemical adsorption, including mineral co-precipitation and cations exchange, was account for 93.75% − 97.01% of the adsorption contribution. Pearson correlation analysis and quantitative analysis showed that the adsorption capacity of co-precipitation ( Qcp ) and cations exchange ( Qci ) were significantly positively correlated with ash content and cations exchange capacity ( p < 0.01), respectively. The quantitative relationships between total adsorption capacity ( Qt ), Qcp or Qci and T are Qt = 54.01 + 0.39exp(0.0051 T ), Qcp = 71.80–101.91exp(−0.0024 T ), Qci = 12.25 + 311.73exp(−0.0093 T ) and Qt = 0.93 Qci + 0.91 Qcp + 7.70.