Synthesis of composite zeolite membrane by low-temperature water bath for efficient dynamic hardwater softening

Deng, Xingfa; He, Yan; Cui, Xue-min

doi:10.1016/j.jece.2023.109482

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…As is well known, zeolite includes natural zeolite and artificial synthetic zeolite. Both natural and synthesized zeolites are characterized by a microporous crystal structure with an opening pore size smaller than 20 Å, which facilitates their wide applications as an adsorbent [52], in gas separation [53], as a water softener [54], and as a catalyst [55]. Generally, the cost of natural zeolites is usually much less than that of synthetic ones, and natural zeolites, after pretreatment, could have an equally superior performance to synthetic zeolites, which makes their use in the treatment of drinking water and watershed water very attractive [56].…”

Section: Introductionmentioning

confidence: 99%

Removal of Emerging Organic Pollutants by Zeolite Mineral (Clinoptilolite) Composite Photocatalysts in Drinking Water and Watershed Water

Zhou,

Wang,

Shen

et al. 2024

Catalysts

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One of the most challenging problems for people around the world is the lack of clean water. In the past few decades, the massive discharge of emerging organic pollutants (EOPs) into natural water bodies has exacerbated this crisis. Considerable research efforts have been devoted to removing these EOPs due to their biotoxicity at low concentrations. Heterogeneous photocatalysis via coupling clay minerals with nanostructured semiconductors has proven to be an economical, efficient, and environmentally friendly technology for the elimination of EOPs in drinking water and watershed water. Natural zeolite minerals (especially clinoptilolites) are regarded as appropriate supports for semiconductor-based photocatalysts due to their characteristics of having a low cost, environmental friendliness, easy availability, co-catalysis, etc. This review summarizes the latest research on clinoptilolites used as supports to prepare binary and ternary metal oxide or sulfide semiconductor-based hybrid photocatalysts. Various preparation methods of the composite photocatalysts and their degradation efficiencies for the target contaminants are introduced. It is found that the good catalytic activity of the composite photocatalyst could be attributed to the synergistic effect of combining the clinoptilolite adsorbent with the semiconductor catalyst in the heterogeneous system, which could endow the composites with an excellent adsorption capacity and produce more e−/h+ pairs under suitable light irradiation. Finally, we highlight the serious threat of EOPs to the ecological environment and propose the current challenges and limitations, before putting the zeolite mineral composite photocatalysts into practice. The present work would provide a theoretical basis and scientific support for the application of zeolite-based photocatalysts for degrading EOPs.

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