Abstract

The influence of zinc oxide (ZnO) nanoparticles on the mechanical properties and photocatalytic degradation of methylene blue (MB) of ZnO-based geopolymer material was investigated under the illumination of ultraviolet (UV) radiations. In this work, ZnO-based geopolymer paste was manufactured using class F fly ash (FA) and ZnO nanoparticles powders with different mass percentages (0, 2.5, 5.0, 7.5 and 10 wt%). The FA-ZnO dry mix was activated by alkaline activator solution made from sodium silicate and sodium hydroxide with a ratio of 2.5. The mechanical properties were investigated by performing a compressive strength test at 28 days. The photocatalytic activity of ZnO nanoparticles was evaluated by measuring the photodegradation level of methylene blue under sunlight rays. The results showed a substantial influence of ZnO on the compressive strength, which decreased with the increase of ZnO amounts ranging from 2.5 to 7.5 wt% then a slightly increased at 10 wt% of ZnO. The addition of ZnO nanoparticles to a geopolymeric material showed a satisfactory efficiency of photocatalytic degradation of methylene blue after 150 min of exposure to sunlight. Phase analysis revealed that the addition of ZnO nanoparticles in the geopolymeric system develops a new ZnO crystalline phases.

Graphic Abstract

中文翻译：

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ZnO纳米颗粒对自清洁基于ZnO的地质聚合物糊的力学性能和光催化活性的影响

抽象的

在紫外线（UV）照射下，研究了纳米氧化锌（ZnO）对基于ZnO的地质聚合物材料的力学性能和亚甲基蓝（MB）的光催化降解的影响。在这项工作中，使用具有不同质量百分比（0、2.5、5.0、7.5和10 wt％）的F级粉煤灰（FA）和ZnO纳米颗粒粉末制造ZnO基地质聚合物浆料。FA-ZnO干混合物用硅酸钠和氢氧化钠的比例为2.5的碱性活化剂溶液活化。通过在28天时进行抗压强度试验来研究机械性能。通过在阳光下测量亚甲基蓝的光降解水平来评估ZnO纳米粒子的光催化活性。结果表明，ZnO对压缩强度的影响很大，随着ZnO含量从2.5到7.5 wt％的增加而降低，然后在10 wt％的ZnO处略有增加。将ZnO纳米颗粒添加到地聚合物中后，暴露在阳光下150分钟后，显示出令人满意的亚甲基蓝光催化降解效率。相分析表明，在地质聚合物体系中添加ZnO纳米颗粒会形成新的ZnO晶相。

图形摘要