摘要
以生物质废弃物柚子皮为主要原料,将新鲜柚子皮经过烘干粉碎后用于吸附去除水中的六价铬和砷。研究显示柚子皮含有大量纤维状物质,存在大量微细孔道,比表面积大,具有一定的吸附能力,可用于吸附去除水中的六价铬和砷。当水中六价铬和砷离子浓度为1~10 mg/L,吸附反应时间为10 min,柚子皮的投加量为15 g/L,吸附反应温度50℃,水中六价铬和砷的去除率分别可达91.87%和60.57%,单位吸附量q最大值分别为0.63 mg/g和0.41 mg/g。吸附过程可以用Langmuir等温式和Freundlich等温式描述。研究表明柚子皮有一定的酸碱缓冲能力,可自动调节废水p H值,操作简单,无二次污染,考虑用作低浓度含六价铬和砷废水的处理,有利于生物质废弃物的资源化利用。
In order to remove the possible poinsonous ions( Cr( VI) and As) in the pollutant water,our study focuses on the biomassed material,pomelo peer,which undergo drying and grinding in sequence. For the existence of a great deal of fiber tunnels in the scale of micrometer,the pomelo peer has great specific surface area in the morphology and showes extraordinary capacity in absorbent experiments. In the following unified criterions,the Cr( VI) and As ions concentration range of 1 ~10 mg / L,the reaction time of 10 min,the pomelo peer dosage of 15 g / L,and the reaction temperature of 50 degrees,the maximal values of the removing rate and the unit absorbent amount can reach 91. 87% and 60. 57%,0. 63 mg / g and 0. 41 mg /g,for the ions of Cr( VI) and As,relevantly. The adsorption could be explained by the isothermal equations of Langmuir and Freundlich. Our research results proved the pomelo peer could be a biomassed material in the treatments of the pollutant waters with low concentrations of Cr( VI) and As,for buffer capacity in the auto-control of the p H value and the easy operation,plus free of secondary pollution.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第S1期299-302,共4页
Environmental Engineering
基金
"十二五"环境领域国家科技支撑计划课题(2014BAC09B01-02)
国家自然科学基金(21307008)
关键词
柚子皮
六价铬
砷
吸附
pomelo peel
Cr(Ⅵ)
As
adsorption
