Huang Yunyun, Wang Zehua, Zhou Zhiwen, Zhou Qi, Chen Jianxin
School of Resources & Environment, Key Laboratory of Poyang Lake Environmental and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031, China.
School of Resources & Environment, Key Laboratory of Poyang Lake Environmental and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031, China.
Environ Res. 2025 Oct 15;283:122206. doi: 10.1016/j.envres.2025.122206. Epub 2025 Jun 20.
Despite the high adsorption capacity of fly ash-based tobermorite (TFA) for Pb(II), its performance for Cd(II) and Zn(II) was poor, and it proved difficult to separate and recover as a powdered adsorbent. Based on a multifunctional design strategy, this study proposes the innovative use of a tannic acid-modified fly ash-based magnetic tobermorite composite material (TFA-FeO/TA). Characterization revealed that TFA-FeO/TA possessed superparamagnetic properties and enriched hydroxyl groups. The adsorption performance of TFA-FeO/TA for heavy metals was significantly improved. In the single-metal system, the adsorption capacities of TFA-FeO/TA for Pb(II), Cd(II), and Zn(II) were 344.0 mg/g, 108.1 mg/g, and 99.16 mg/g, respectively, representing an increase of 14.97 %, 72.13 %, and 73.53 %, respectively, compared to unmodified TFA. The adsorption procedure followed the Langmuir model and the pseudo-second-order kinetic model, signifying monolayer chemisorption. Moreover, in the multi-metal system, TFA-FeO/TA maintained adsorption capacities of 112.7, 58.81, and 65.56 mg/g for Pb(II), Cd(II), and Zn(II), respectively, although these values decreased compared to the single-metal system. The primary adsorption mechanisms involved coordination, ion exchange, metal-π interaction, electrostatic interaction and pore adsorption. TFA-FeO/TA demonstrated exceptional integrated functions of "adsorption-separation-recovery," making it an ideal adsorbent material for removing Pb(II), Cd(II), and Zn(II) from contaminated water.
尽管基于粉煤灰的雪硅钙石（TFA）对Pb（II）具有较高的吸附容量，但其对Cd（II）和Zn（II）的吸附性能较差，并且作为粉末状吸附剂难以分离和回收。基于多功能设计策略，本研究提出了一种创新的方法，即使用单宁酸改性的基于粉煤灰的磁性雪硅钙石复合材料（TFA-FeO/TA）。表征结果表明，TFA-FeO/TA具有超顺磁性特性且富含羟基。TFA-FeO/TA对重金属的吸附性能得到显著提高。在单金属体系中，TFA-FeO/TA对Pb（II）、Cd（II）和Zn（II）的吸附容量分别为344.0 mg/g、108.1 mg/g和99.16 mg/g，与未改性的TFA相比，分别提高了14.97%、72.13%和73.53%。吸附过程遵循朗缪尔模型和准二级动力学模型，表明为单层化学吸附。此外，在多金属体系中，TFA-FeO/TA对Pb（II）、Cd（II）和Zn（II）的吸附容量分别维持在112.7、58.81和65.56 mg/g，尽管这些值与单金属体系相比有所下降。主要吸附机制包括配位、离子交换、金属-π相互作用、静电相互作用和孔隙吸附。TFA-FeO/TA展现出“吸附-分离-回收”的卓越综合功能，使其成为从污染水中去除Pb（II）、Cd（II）和Zn（II）的理想吸附材料。
