Monolithic adsorbent removal of fluoride from water is considered an effective and non-secondary pollution method. Here, a portable hydroxyl-functionalized coal gangue-based cordierite porous ceramic sheet (ACGC-Fe) is prepared by using coal gangue solid waste with a specific silicon-aluminum-rich composition ratio and a small amount of magnesium oxide as a raw material through powder compression molding and mild chemical modification. The prepared ACGC-Fe can be used to treat fluorine-containing wastewater and the maximum adsorption of fluorine can reach 18.69 mg g⁻¹. The Langmuir (Freundlich) adsorption isotherm model and pseudo-second-order kinetic model here provided a satisfactory description of the fluoride removal operating mechanism, and it is confirmed that the adsorption mechanism of ACGC-Fe is mainly attributed to the chemisorption of hydrogen bonds (with hydroxyl group) and ionic bonds (with metal), and physical adsorption based on cordierite porous ceramic pores. This research will provide a new idea for designing high-performance materials by mining and analyzing the composition and structure characteristics of coal gangue solid waste itself and broaden the application range of high-value-added coal gangue solid waste.

中文翻译：

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便携式羟基功能化煤矸石基堇青石多孔陶瓷片有效吸附含氟废水

整体吸附剂去除水中氟化物被认为是一种有效且无二次污染的方法。本研究以特定富硅铝组成比的煤矸石固废和少量氧化镁为原料，通过粉末压缩成型和温和的化学改性。制备的ACGC-Fe可用于处理含氟废水，最大吸附氟量可达18.69 mg g ^-1。 Langmuir（Freundlich）吸附等温线模型和准二级动力学模型对除氟运行机制提供了令人满意的描述，并证实ACGC-Fe的吸附机制主要归因于氢键的化学吸附（与羟基）和离子键（与金属），以及基于堇青石多孔陶瓷孔的物理吸附。该研究将为通过开采和分析煤矸石固体废物本身的成分和结构特征来设计高性能材料提供新思路，拓宽高附加值煤矸石固体废物的应用范围。