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文章采用一步水热法制备硅酸钠改性污泥基水热炭，并探究其对Cu(Ⅱ)与四环素(TC)的协同吸附性能及作用机制。硅酸钠改性可显著优化水热炭的孔结构，所优化的硅酸钠改性污泥基水热炭(CDHC-0.5)不仅具有高比表面积(68.99 m²/g)，还含有羟基、羧基、硅酸盐等多种功能基团。在双组分体系中，当pH为5时，CDHC-0.5对Cu(Ⅱ)与TC的吸附量分别为1.595 mmol/g与0.431 mmol/g，较单组分分别提升了20.20%和112.32%，协同吸附效应显著。研究表明，两种污染物的吸附行为均符合准二级动力学模型；热力学参数分析则证实，该吸附为自发吸热过程。此外，CDHC-0.5对Cu(Ⅱ)具有高选择性吸附能力，分配系数为3569.9 mL/g，且5次循环后吸附量仍保持在初始吸附量的82%以上。结合吸附前后结构的表征结果，文章阐明了Cu(Ⅱ)与TC的吸附机制，该过程主要包括静电吸引和官能团络合，硅酸盐与Cu(Ⅱ)的沉淀反应及Cu(Ⅱ)金属桥接作用，共同强化其协同吸附过程。
Abstract：The article prepared sodium silicate-modified sludge-based hydrothermal carbon(CDHC-0.5) by a onestep hydrothermal method and investigated its synergistic adsorption performance and mechanism for Cu(Ⅱ) and tetracycline(TC). Sodium silicate modification can significantly optimize the pore structure of hydrothermal carbon. CDHC-0.5 not only has a high specific surface area(68.99 m²/g), but also contains various functional groups such as hydroxyl, carboxyl, and silicate. In a dual-component system, when the pH is 5.0, the adsorption capacities of CDHC-0.5 for Cu(Ⅱ) and TC are 1.595 mmol/g and 0.431 mmol/g, respectively, which are 20.20% and 112.32% higher than those in single-component systems, indicating a significant synergistic adsorption effect. The study shows that the adsorption behaviors of both pollutants conform to the pseudo-second-order kinetic model. Thermodynamic parameter analysis confirms that the adsorption process is a spontaneous endothermic process. In addition, CDHC-0.5 has a high selective adsorption capacity for Cu(Ⅱ), with a distribution coefficient of 3569.9 mL/g, and the adsorption capacity remains above 82% of the initial adsorption capacity after five cycles. Based on the characterization results before and after adsorption, the article clarifies the adsorption mechanism of Cu(Ⅱ) and TC, which mainly includes electrostatic attraction and functional group complexation, the precipitation reaction of silicate with Cu(Ⅱ), and the metal bridging effect of Cu(Ⅱ), all of which jointly enhance the synergistic adsorption process.
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基本信息:
DOI：10.16026/j.cnki.iea.2026010019
中图分类号:X703;TQ424
引用信息:
[1]张为国,刘子帆,鲁凌霄,等.硅酸钠改性污泥基水热炭协同吸附水中铜离子/四环素[J].离子交换与吸附,2026,42(01):19-31.DOI:10.16026/j.cnki.iea.2026010019.
基金信息:
国家自然科学基金项目（项目号51878334）
2026-02-20
2026-02-20