污泥生物炭的制备及其对亚甲基蓝的吸附研究
Preparation of sludge biochar and its adsorption characteristics on methylene blue
谢鹏程 1高海涛 1熊健 1杨博 1黄瑞卿 1周海洋 1李伟1
作者信息
- 1. 西藏大学生态环境学院,西藏拉萨 850000
- 折叠
摘要
以污水处理厂中剩余污泥为原料,通过一步热解法,在缺氧条件下制备出不同温度梯度(300,500,700,750℃)的污泥生物炭,测定最佳热解温度制备出的污泥生物炭对亚甲基蓝的吸附性能,并通过BET、FTIR和形貌方法进行表征分析.结果表明,在缺氧条件下700℃热解1 h制备的污泥生物炭对亚甲基蓝去除效果最好,去除率可达97.9％.在35℃的反应温度,生物炭投加量10 g/L,吸附平衡时间12 h条件下,SB700对亚甲基蓝的理论吸附量9.87 mg/g,拟二级动力学模型对SB700吸附亚甲基吸附过程的拟合相关系数(R2)为0.987 8,高于拟一级动力学模型,表明吸附过程以单分子的化学吸附为主.
Abstract
Using the residual sludge from a sewage treatment plant as raw material,sludge biochar with different temperature gradients(300,500,700,750 ℃)was prepared by one-step pyrolysis under anoxic conditions,and the adsorption performance of the sludge biochar prepared with optimal pyrolysis tempera-tures on methylene blue was determined,and characterized and analyzed by BET,FTIR,and morphology methods.The results showed that the sludge biochar prepared by pyrolysis at 700 ℃ for 1 h under anoxic conditions could remove methylene blue efficiently,and the removal rate could reach 97.9％.The theoret-ical adsorption capacity of SB700 for methylene blue reached 9.87 mg/g at the reaction temperature of 35 ℃,biochar dosage of 10 g/L and adsorption equilibrium time of 12 h.The correlation coefficient of the proposed second-order kinetic model for the adsorption of methylene blue by SB700 was 0.987 8,which was higher than that of the proposed first-order kinetic model,indicating that the adsorption process was dominated by the chemical adsorption of monomolecules.
关键词
剩余污泥/热解生物炭/亚甲基蓝/吸附影响/模型拟合Key words
residual sludge/pyrolytic biochar/methylene blue/adsorption effects/model fitting引用本文复制引用
基金项目
西藏自治区科技计划(XZ202101ZD14G)
西藏自治区科技计划(XZ202202YD0027C)
西藏自治区科技计划(XZ202301ZY0020G)
中央支持地方高校专项(藏财预指[2023]01)
中央支持地方高校专项([2024]01)
西藏大学人才发展激励计划青年学者项目()
出版年
2024
NETL
NSTL
万方数据