基于废物的负载 CdS 的分级多孔地质聚合物的简便合成及其对有机污染物的吸附-光催化作用及其环境风险。
Facile synthesis of waste-based CdS-loaded hierarchically porous geopolymer for adsorption-photocatalysis of organic contamination and its environmental risks.
机构信息
State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China.
出版信息
Chemosphere. 2022 Dec;308(Pt 1):136144. doi: 10.1016/j.chemosphere.2022.136144. Epub 2022 Aug 24.
In order to obtain an adsorbent-photocatalyst with low-cost, strong stability and great reusability/recyclability, a waste-based and CdS-loaded hierarchically porous geopolymer (HPG) was prepared by facile synthesis. The adsorption-photocatalysis ability, reusability, and stability of HPG under different conditions were determined. Results indicated that HPG showed better adsorption-photocatalysis performance for organic dyes under alkaline environment, and it remained a high adsorption-photocatalysis efficiency after used for five times. Furthermore, HPG was stable in different environment conditions (strong acidic, acid raining, neutral, high salinity, and high alkali environment). The mass loss of HPG were around 3.22-6.68% (7 days extraction), and the immobilization rates of Cd in neutral, high salinity, and high alkali environments were higher than 99.99%. Under visible light irradiation, HPG effectively photo-degraded the organic substances in overlying water of polluted sediments. After 330 min irradiation, the concentrations of COD and TOC were decreased from 47.52 mg/L and 20.9 mg/L to 16.58 mg/L and 11.19 mg/L, respectively. The humic-like and fulvic-like substances were transformed to protein-like substances under photo-degradation effect. This study confirmed that HPG possesses advantages in cost, chemical stability, and reusability, and it has a great potential to be used as in-situ remediation environmental functional material for organic contaminants in lake.
为了获得一种成本低、稳定性强、可重复使用/回收性好的吸附-光催化剂，通过简便的合成方法制备了一种基于废物且负载 CdS 的分级多孔地质聚合物（HPG）。确定了 HPG 在不同条件下的吸附-光催化能力、可重复使用性和稳定性。结果表明，HPG 在碱性环境下对有机染料表现出更好的吸附-光催化性能，并且在使用五次后仍保持较高的吸附-光催化效率。此外，HPG 在不同的环境条件（强酸、酸雨、中性、高盐度和高碱性环境）下均稳定。HPG 的质量损失约为 3.22-6.68%（7 天提取），在中性、高盐度和高碱性环境中 Cd 的固载率均高于 99.99%。在可见光照射下，HPG 有效地光降解了污染沉积物上覆水中的有机物质。照射 330 分钟后，COD 和 TOC 的浓度分别从 47.52 mg/L 和 20.9 mg/L 降低到 16.58 mg/L 和 11.19 mg/L。在光降解作用下，腐殖质样和富里酸样物质转化为蛋白样物质。本研究证实，HPG 在成本、化学稳定性和可重复使用性方面具有优势，并且具有作为湖泊中有机污染物原位修复环境功能材料的巨大潜力。
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