摘要
以大豆秸秆、高粱秸秆为原料,在350、500、650℃条件下,限氧控温制备生物炭,探讨不同类型生物炭性质及其对溶液中重金属Pb2+的吸附特性;利用2种等温吸附模型(Langmuir、Freundlich模型)研究了不同类型生物炭对Pb2+的吸附行为。结果表明:不同热解温度下的大豆、高粱生物炭,其灰分、挥发分及固定碳存在一定的差异性;随着热解温度的升高,生物炭对Pb2+的吸附性能增强。大豆生物炭对Pb2+的吸附量明显大于高粱生物炭;采用Langmuir和Freundlich分别对吸附数据进行拟合,两种生物炭的吸附行为更符合Freundlich模型,且属于线性等温吸附。
Biochars were prepared from soybean and broomcorn straws at 350℃,500℃ and 600℃ under the protection of nitrogen atmosphere. The biochar properties and the adsorption characteristics for Pb2 ＋in aqueous solutions were investigated. The adsorption isotherm for Pb2 ＋of different biochars were analyzed by Langmuir and Freundlich models. The results showed that the ash content,volatile matter and fixed carbon of soybean and broomcorn straws were different under different pyrolysis temperatures. Adsorption capacity of biochar to Pb2 ＋gradually increased with the increase of pyrolysis temperature. Moreover,the adsorption capacity of soybean biochar for Pb2 ＋was significantly higher than that of broomcorn biochar. The adsorption experiments revealed that the adsorption behavior of the two biochar types fitted Freundlich model very well,and belonged to linear isotherm adsorption.
作者
李赟
孙宵琦
于瑞雪
房晓茹
陈甜甜
单瑞峰
Li Yun;Sun Xiaoqi;Yu Ruixue;Fang Xiaoru;Chen Tiantian;Shan Ruifeng(College of Geography and Tourism, Qufu Normal University/ Shandong Provincial UniversityKey Laboratory of Wetland Ecology and Environmental Protection of Nansihu Lake, Rizhao 276826, China)
出处
《山东农业科学》
2018年第9期78-82,共5页
Shandong Agricultural Sciences
基金
国家自然科学基金项目(41501542)
山东省重点研发计划项目(2016GNC110017)
国家大学生创新项目(201610446089)
