Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Ministry of Education, Guilin, 541004, People's Republic of China.
School of Environment and Resource, Guangxi Normal University, Guilin, 541004, People's Republic of China.
Sci Rep. 2022 Feb 21;12(1):2895. doi: 10.1038/s41598-022-06849-6.
In this study, the impregnation synthesis of NiO/sepiolite and its application for dye removal during wastewater treatment is introduced. The NiO/sepiolite materials act as an adsorbent/catalyst. It comprises a unique combination of adsorption and high-temperature gas flow regeneration (the NiO/sepiolite acts as a catalyst at this stage, using regeneration rate as evaluation index of catalytic activity of NiO/sepiolite) in a single unit, in which the NiO/sepiolite was regenerated and reused for the next round adsorption of dye. An aqueous solution of methylene blue was used to evaluate the adsorption and regeneration performance of the adsorbent/catalyst. The regeneration rate reached 74% when the reaction time and temperature were 7 min and 350 °C, respectively. The effects of the regeneration temperature and volume fraction of O on the regeneration rate were investigated. And the regeneration reaction kinetics was provided. The combination of adsorptive and catalytic properties in the NiO/sepiolite composites received interesting results for removing refractory biodegradable organic pollutants. This work provides new insights for the removal of dye from wastewater using Ni catalysts supported on natural low-cost clay.
在这项研究中，介绍了 NiO/海泡石的浸渍合成及其在废水处理中去除染料的应用。NiO/海泡石材料作为吸附剂/催化剂。它由吸附和高温气流再生（在这个阶段，NiO/海泡石作为催化剂，以再生速率作为 NiO/海泡石催化活性的评价指标）在一个单一的单元中独特的结合，其中 NiO/海泡石被再生并重新用于下一轮染料吸附。采用亚甲基蓝水溶液评价了吸附剂/催化剂的吸附和再生性能。当反应时间和温度分别为 7 min 和 350°C 时，再生率达到 74%。考察了再生温度和 O 体积分数对再生率的影响，并提供了再生反应动力学。NiO/海泡石复合材料中吸附和催化性能的结合为去除难生物降解的有机污染物提供了有趣的结果。这项工作为使用天然廉价粘土负载的 Ni 催化剂去除废水中的染料提供了新的见解。
