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污泥生物炭的制备及其对亚甲基蓝的吸附研究

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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。
Preparation of sludge biochar and its adsorption characteristics on methylene blue
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.

residual sludgepyrolytic biocharmethylene blueadsorption effectsmodel fitting

谢鹏程、高海涛、熊健、杨博、黄瑞卿、周海洋、李伟

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西藏大学生态环境学院,西藏拉萨 850000

剩余污泥 热解生物炭 亚甲基蓝 吸附影响 模型拟合

西藏自治区科技计划西藏自治区科技计划西藏自治区科技计划中央支持地方高校专项中央支持地方高校专项西藏大学人才发展激励计划青年学者项目

XZ202101ZD14GXZ202202YD0027CXZ202301ZY0020G藏财预指[2023]01[2024]01

2024

应用化工
陕西省石油化工研究设计院　陕西省化工学会

应用化工

CSTPCD北大核心
影响因子：0.411
ISSN：1671-3206
年,卷(期)：2024.53(5)