Abstract:In this study, the absorption effect of sludge biochar (SBC) prepared with paper industry sludge was investigated by adjusting pyrolysis temperatures (300℃, 500℃ and 700℃) under oxygen restriction. The physical and chemical properties of three types of biochar (SBC300, SBC500, and SBC700) were compared, along with their characteristics and mechanism of adsorbing TC. The results showed that the adsorption of TC by SBC was dominated by chemical adsorption. At adsorption equilibrium, the removal rate of TC by SBC300 was the least at 38.8%, and the removal rate by SBC700 was the highest at 54.1%. Meanwhile, the Langmuir model better described the adsorption process and the maximum adsorption amount was SBC700 (63.8mg/g) > SBC500(50.6mg/g) > SBC300(40.0mg/g), respectively. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. And the adsorption process would be greatly affected by pH value as it could influence the existing form of TC and the surface chargeability of SBC. The isotherm decomposition method was used to quantify the contribution of surface adsorption and partition. Combined with FTIR analysis, it indicated that the adsorption process of TC with SBC was the joint effects of partition, electrostatic attraction, hydrogen bonding, π-π EDA and ion exchange.
张娟香, 赵保卫, 马锋锋, 段凯祥, Bakunzib Philippe, 刘辉. 造纸污泥生物炭对四环素的吸附特性及机理[J]. 中国环境科学, 2020, 40(9): 3821-3828.
ZHANG Juan-xiang, ZHAO Bao-wei, MA Feng-feng, DUAN Kai-xiang, Bakunzib Philippe, LIU Hui. Adsorption characteristics and mechanism of tetracycline by biochars derived from paper industry sludge. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3821-3828.
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