Machine-learning-guided high-throughput screening of covalent organic framework materials for rhenate adsorption

doi:10.19965/j.cnki.iwt.2025-0499

Abstract

Abstract:

Efficient removal of high concentrations of pertechnetate (⁹⁹TcO₄⁻) from nuclear wastewater is critical. Current adsorbents have limited capacity and require frequent regeneration, thereby increasing the risk of nuclide re-release. Covalent organic frameworks (COFs) show significant potential for adsorbing rhenate acid (ReO₄⁻) (a surrogate for ⁹⁹TcO₄⁻), but traditional experimental screening for effective COFs is inefficient. Consequently, we proposed using machine learning to screen COFs. A comprehensive dataset was created from literature data on COFs properties and ReO₄⁻ adsorption parameters. A random forest model, trained on this data, performed well and was used to simulate adsorption and identify high-performance adsorbents from a public database. Key structural characteristics indicated that adjusting the pore limited diameter (2-5 nm) and weighted atomic electronegativity (0.8-1.0) of adsorbents notably improved ReO₄⁻ adsorption. This approach efficiently pinpointed top adsorbents, accelerated COFs applications in pollutant removal, and provided a novel method for discovering optimized adsorbents.

Key words: machine learning, covalent organic frameworks, rhenate acid adsorption, high-throughput screening, predictive modeling

摘要：

高效去除核废水中高浓度锝酸盐（⁹⁹TcO₄⁻）至关重要。现有吸附剂容量低，再生频繁，核素再释放风险高。共价有机框架（COFs）在吸附铼酸（锝酸替代物）方面潜力显著，但传统实验方式筛选高性能吸附剂效率较低。为此，提出基于机器学习的COFs筛选策略。通过收集文献中关于COFs特性和铼酸吸附实验参数的多维数据，构建了一个用于预测铼酸吸附性能的数据集。随机森林算法训练的模型表现最佳，可用来模拟吸附过程并从公开数据库中筛选出高容量吸附剂。关键结构特性分析表明，调控吸附剂孔直径（2~5 nm）和原子加权电负性（0.8~1.0）能显著提升水溶液中铼酸吸附性能。此策略能有效识别高性能水处理吸附剂，加速COFs材料在污染物去除中的应用，为发现优势吸附剂提供了新方法。

关键词: 机器学习, 共价有机框架, 铼酸吸附, 高通量筛选, 模型预测

CLC Number:

X703

Ling YUAN, Han ZHANG, Chen CHEN, Xin ZHAO, Lu LÜ, Weiming ZHANG. Machine-learning-guided high-throughput screening of covalent organic framework materials for rhenate adsorption[J]. Industrial Water Treatment, 2025, 45(12): 65-73.

袁岭, 张涵, 陈晨, 赵昕, 吕路, 张炜铭. 机器学习辅助高通量筛选共价有机框架材料吸附铼酸[J]. 工业水处理, 2025, 45(12): 65-73.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2025-0499

https://www.iwt.cn/EN/Y2025/V45/I12/65

Figures/Tables 7

Fig.1 Workflow of this study

Fig.2 Statistical distributions of numeric variables for ML models

Fig.3 Pearson correlation coefficient matrix between all descriptors

Fig.4 Feature importance of input variables in RF model（a） and optimal descriptor combination based on recursive feature elimination（b）

Fig.5 Construction and performance of ML algorithms for predicting ReO₄ ^- adsorption onto COFs

Fig.6 Interaction characteristic analysis of pH and initial concentration （a）， partial dependence analysis of initial concentration（b）， partial dependence analysis of pH（c）， partial dependence analysis of adsorbent dose （d）

Fig.7 Structure-adsorption capacity relationships of COFs

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