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首页> 外文期刊>RSC Advances >Photocatalytic activity of micron-scale brass on emerging pollutant degradation in water: mechanism elucidation and removal efficacy assessment
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Photocatalytic activity of micron-scale brass on emerging pollutant degradation in water: mechanism elucidation and removal efficacy assessment

机译：微米级黄铜对水中污染物降解的光催化活性：机制阐明及去除疗效评估

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Alloys or smelted metal mixtures have served as cornerstones of human civilization. The advent of smelted copper and tin, i.e. , bronze, in the 4 ~(th) millennium B.C. in Mesopotamia has pioneered the preparation of other metal composites, such as brass ( i.e. , mixture of copper and zinc), since the bronze age. The contemporary use of these alloys has expanded beyond using their physical strength. The catalytic chemistry of micron-scale brass or copper–zinc alloy can be utilized to effectively degrade emerging contaminants (ECs) in water, which are presenting significant risks to human health and wildlife. Here, we examine the photocatalytic activity of a commercially available micro-copper–zinc alloy (KDF? 55, MicroCuZn), made with earth abundant metals, for oxidative removal of two ECs. The micron-scale brass is independently characterized for its morphology, which confirms that it has the β-brass phase and that its plasmonic response is around 475 nm. Estriol (E3), a well-known EC, is removed from water with ultraviolet (UV) radiation catalyzed by MicroCuZn and H _(2) O _(2) –MicroCuZn combinations. The synergy between H _(2) O _(2) , UV, and MicroCuZn enhances hydroxyl radical (˙OH) generation and exhibit a strong pseudo-first-order kinetic degradation of E3 with a decay constant of 1.853 × 10 ~(?3) min ~(?1) ( r ~(2) = 0.999). Generation of ˙OH is monitored with N , N -dimethyl-4-nitrosoaniline ( p NDA) and terephthalic acid (TA), which are effective ˙OH scavengers. X-ray photoelectron spectroscopy analysis has confirmed ZnO/CuO–Cu _(2) O film formation after UV irradiation. The second EC studied here is Δ9-tetrahydrocannabinol or THC, a psychotropic compound commonly consumed through recreational or medicinal use of marijuana. The exceptionally high solids–water partitioning propensity of THC makes adsorption the dominant removal mechanism, with photocatalysis potentially supporting the removal efficacy of this compound. These results indicate that MicroCuZn can be a promising oxidative catalyst especially for degradation of ECs, with possible reusability of this historically significant material with environmentally-friendly attributes.
机译：合金或冶炼金属混合物曾用作人类文明的基石。冶炼铜和锡的出现，即青铜，在4〜（th）千年b.c。在中索托伐菊属中，在青铜时期以来，在Mesopotamia促进了其他金属复合材料的制备，例如黄铜（即铜和锌的混合物）。当代使用这些合金已经扩大超出使用其体力。微米级黄铜或铜锌合金的催化化学可用于有效降解水中的新兴污染物（ECS），这对人类健康和野生动物产生了重大风险。在此，我们检查用土坯金属制成的市售微铜 - 锌合金（KDFα55，微核）的光催化活性，用于两种EC的氧化去除。微米级黄铜独立地表征其形态，证实它具有β-黄铜阶段，并且其等离子体响应约为475nm。雌醇（E3）是众所周知的EC，用紫外（UV）辐射除去通过微核和H _（2）O _（2）-Microcuzn组合的紫外（UV）辐射。 H _（2）O _（2），UV和微核和微核和微核和甲基）产生的协同作用增强了羟基（˙OH）的产生，表现出E3的强伪一阶动力学降解，衰减常数为1.853×10〜（？ 3）min〜（？1）（r〜（2）= 0.999）。用N，N-二甲基-4-亚硝酸苯胺（P NDA）和对苯二甲酸（TA）监测˙OH的产生，其是有效的˙OH清除剂。 X射线光电子能谱分析已经证实了UV照射后的ZnO / CuO-Cu _（2）o膜形成。这里研究的第二个EC是δ9-四氢甘露那尼罗酚或THC，一种通过大麻的娱乐或药用使用常见的精神渗透化合物。特异性高固体 - 水分配的THC倾向使吸附优势去除机制，光催化可能支持该化合物的去除功效。这些结果表明，微统计学可以是有前途的氧化催化剂，尤其是EC的降解，具有这种历史上有重要的材料，具有环境友好的属性可能的可重用性。

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