Huang Yangpeng, Shen Dekui, Wang Zhanghong
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China.
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China.
Polymers (Basel). 2022 Feb 28;14(5):968. doi: 10.3390/polym14050968.
In order to seek the value-added utilization method of sewage sludge and develop low-cost and high-efficient adsorbents, a hydrochar was prepared by the co-hydrothermal carbonization of sewage sludge and citric acid and then characterized. The differences in Pb(II) adsorption performance between the citric acid-sewage sludge hydrochars (AHC) and the hydrochar prepared solely from sewage sludge (SSHC) were also investigated. When citric acid dose ratio (mass ratio of citric acid to dry sewage sludge) is 0.1, the obtained hydrohcar (AHC0.1) has the highest specific surface area (59.95 m·g), the most abundant oxygen-containing functional groups, the lowest pH (5.43), and the highest equilibrium adsorption capacity for Pb(II). The maximum adsorption capacity of AHC0.1 for Pb(II) is 60.88 mg·g (298 K), which is approximately 1.3 times that of SSHC. The potential mechanisms can be electrostatic attraction, co-precipitation, complexation, and cation-π interaction. It was demonstrated that by incorporating citric acid into the hydrothermal carbonization, resource utilization of sewage sludge can be accomplished effectively.
为寻求污泥的增值利用方法并开发低成本高效吸附剂，通过水热共碳化法将污泥与柠檬酸制备成水热炭并进行表征，同时考察了柠檬酸-污泥水热炭（AHC）与单一污泥水热炭（SSHC）对Pb(II)吸附性能的差异。当柠檬酸投加比例（柠檬酸与干污泥的质量比）为0.1时，所得水热炭（AHC0.1）具有最大比表面积（59.95 m²·g）、最丰富的含氧官能团、最低的pH值（5.43）以及对Pb(II)最高的平衡吸附量。AHC0.1对Pb(II)的最大吸附量为60.88 mg·g（298 K），约为SSHC的1.3倍。潜在机制可能为静电吸引、共沉淀、络合及阳离子-π相互作用。结果表明，通过在水热碳化过程中引入柠檬酸，可有效实现污泥的资源化利用。
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