摘要
为探索农业废弃物再生吸附材料对微囊藻毒素的吸附机制问题,采用典型农业废弃物雷竹落叶制备生物炭,研究适宜的制备工艺,探讨吸附条件和有机介质对微囊藻毒素-LR(MCLR)的吸附特性影响及其机制.结果表明,雷竹落叶竹叶生物炭的芳香性随着炭化温度和升温速率的升高而增加,极性指数则减小,同时比表面积也迅速增大,从0.25 m2·g-1到87.09 m2·g-1;竹叶生物炭对水体中MCLR具有较强的吸附能力,吸附量随炭化温度和升温速率的升高而增加,从72.27μg·g-1到624.47μg·g-1;吸附行为符合非线性Freundlich模型,且N指数和lnKF与芳香性和极性大小呈良好的线性关系;吸附效果受pH、反应温度和自然界溶解性有机质(DOMs)的影响,在pH值为3时有最大吸附量,当反应温度升高时吸附量减小,DOMs对MCLR的吸附有明显的竞争作用.适宜的制备工艺生成的雷竹落叶生物炭能有效地去除水体中MCLR.
Sorption of microcystins（MCs） from harmful algae blooms to the biochar remains to be understood in the reuse of bamboo waste for sustainable agriculture. In this study, phyllostaehys praecox leaves were converted to biochar at pyrolysis temperature of 300,400,550 ℃ , and the changes of biochar properties and the adsorption of microeystin-LR （MCLR） were evaluated to find the suitable preparation process and adsorption conditions. The results show that aromaticity of biochar increased with rising pyrolysis temperature and heating rate, but polarity index decreased, and the surface area of biochar increased rapidly from 0.25 to 87.09 m^2·g^-1. With increasing pyrolysis temperature, the biochar had higher adsorption capacity for MCLR, and adsorption capacity reach 624.47 μg·g^-1. The performance of sorption behaviors for MCLR was best described by a nonlinear Freundlich model, and N index and lnKr having a good linear relationship with aromatic and polarity. The adsorption efficiency were dependent on the pH, reaction temperature and dissolved organic matters （DOMs）. Our results indicate the waste of bamboo leaves-phyllostachys praecox-derived can be reused to make biochars for MCLR removal.
出处
《环境化学》
CAS
CSCD
北大核心
2014年第4期617-623,共7页
Environmental Chemistry
关键词
生物炭
微囊藻毒素
吸附性能
雷竹
废物利用
：Biochar, microcystin-LR, adsorption, phyllostachys praecox, waste reuse.
