Facin Fernanda, Staub de Melo João Victor, Costa Puerari Rodrigo, Matias William Gerson
Department of Civil Engineering, Federal University of Santa Catarina (UFSC), Rua Engenheiro Agronômico Andrei Cristian Ferreira, Trindade, Florianópolis 88040-900, SC, Brazil.
Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina (UFSC), Rua Engenheiro Agronômico Andrei Cristian Ferreira, Trindade, Florianópolis 88040-900, SC, Brazil.
Nanomaterials (Basel). 2024 Sep 4;14(17):1447. doi: 10.3390/nano14171447.
The incorporation of titanium dioxide nanoparticles into concrete blocks for paving adds photocatalytic functionality to the cementitious matrix, providing self-cleaning and pollutant-degrading properties. However, wear and leaching from these pavements can release potentially toxic compounds into water bodies, affecting aquatic organisms. In this context, this study evaluated the toxicological effects of leachates from photocatalytic concrete containing nano-TiO with an average size of 10 nm and anatase crystallinity on . Acute and chronic toxicity tests on neonates were conducted with two leachate extracts: one from reference concrete and one from photocatalytic concrete (with 9% nano-TiO added by mass of cement). In terms of acute toxicity, the reference concrete extract had an EC of 104.0 mL/L at 48 h, whereas the concrete with TiO had an EC of 64.6 mL/L at 48 h. For chronic toxicity, the leachate from reference concrete had a significant effect ( < 0.05) on the size parameter with an LOEC of 4 mL/L, whereas the leachate from concrete with 9% nano-TiO did not have significant toxicological effects on any of the analyzed parameters (longevity, size, reproduction, and age of first posture) (LOEC > 6.5 mL/L). Furthermore, FTIR analysis indicated that TiO nanoparticles were not detected in the leachates, suggesting efficient anchoring within the cementitious matrix. The results indicate that there was no increase in the chronic toxicity of the leachate from the cementitious matrix when nanoparticles were added at a 9% mass ratio of cement.
将二氧化钛纳米颗粒掺入用于铺路的混凝土砌块中，可赋予水泥基材料光催化功能，使其具有自清洁和污染物降解特性。然而，这些路面的磨损和沥滤会将潜在的有毒化合物释放到水体中，影响水生生物。在此背景下，本研究评估了平均粒径为10 nm且具有锐钛矿结晶度的含纳米TiO₂光催化混凝土渗滤液的毒理学效应。对新生幼体进行了急性和慢性毒性试验，使用了两种渗滤液提取物：一种来自参考混凝土，另一种来自光催化混凝土（水泥质量中添加了9%的纳米TiO₂）。在急性毒性方面，参考混凝土提取物在48小时时的半数有效浓度（EC）为104.0 mL/L，而含TiO₂的混凝土在48小时时的EC为64.6 mL/L。对于慢性毒性，参考混凝土的渗滤液对尺寸参数有显著影响（P < 0.05），最低观察效应浓度（LOEC）为4 mL/L，而含9%纳米TiO₂的混凝土渗滤液对任何分析参数（寿命、尺寸、繁殖和首次姿势年龄）均无显著毒理学效应（LOEC > 6.5 mL/L）。此外，傅里叶变换红外光谱（FTIR）分析表明，渗滤液中未检测到TiO₂纳米颗粒，这表明其在水泥基材料中有效锚固。结果表明，当以水泥质量比9%添加纳米颗粒时，水泥基材料渗滤液的慢性毒性没有增加。
