Misawa Naoaki, Yasui Kentaro, Sakai Kentaro, Kobayashi Taichi, Nagahama Hideki, Haraguchi Tomohiro, Sasaki Satomi, Torrung Vetchapitak, Luangtongkum Taradon, Taniguchi Takako, Yamada Kentaro, Minamimagari Makoto, Usami Toshihiro, Kinoshita Hiroyuki
Center for Animal Disease Control, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki 889-2192, Japan.
National Institute of Technology, Kagoshima College, 1460-1 Shinko, Hayato-cho, Kirishima 899-5193, Japan.
Nanomaterials (Basel). 2023 Jan 30;13(3):568. doi: 10.3390/nano13030568.
"Akahoya" is a volcanic soil classified as a special soil deposited in Kyushu, Japan. Many of its properties are not yet clearly understood. We found that Akahoya had the potential to adsorb bacteria in cattle feces, which prompted us to investigate its material properties and perform experiments to comprehensively evaluate its adsorption performance for various fine particles such as acidic and basic dyes, NO/SO gas, and phosphoric acid ions, in addition to bacteria. Akahoya had a very high specific surface area owing to the large number of nanometer-sized pores in its structure; it exhibited a high adsorption capacity for both NO and SO. Regarding the zeta potential of Akahoya, the point of zero charge was approximately pH 7.0. The surface potential had a significant effect on the adsorption of acidic and basic dyes. Akahoya had a very high cation exchange capacity when the sample surface was negatively charged and a high anion exchange capacity when the sample surface was positively charged. Akahoya also exhibited a relatively high adsorption capacity for phosphoric acid because of its high level of AlO, and the immersion liquid had a very high Al ion concentration. Finally, filtration tests were performed on suspension using a column filled with Akahoya or another volcanic soil sample. The results confirmed that the adhered on the Akahoya sample. The results of the release test, after the filtration test, suggested that this adhesion to Akahoya could be phosphorus-mediated.
“赤堀土”是一种火山土壤，被归类为沉积在日本九州的特殊土壤。其许多特性尚未完全清楚。我们发现赤堀土有吸附牛粪中细菌的潜力，这促使我们研究其材料特性，并进行实验以全面评估其对各种细颗粒的吸附性能，除细菌外，还包括酸性和碱性染料、NO/SO气体以及磷酸根离子。由于其结构中存在大量纳米级孔隙，赤堀土具有非常高的比表面积；它对NO和SO都表现出高吸附容量。关于赤堀土的zeta电位，零电荷点约为pH 7.0。表面电位对酸性和碱性染料的吸附有显著影响。当样品表面带负电荷时，赤堀土具有非常高的阳离子交换容量，而当样品表面带正电荷时，它具有高阴离子交换容量。由于其高含量的AlO，赤堀土对磷酸也表现出相对较高的吸附容量，并且浸泡液中的Al离子浓度非常高。最后，使用填充有赤堀土或另一种火山土壤样品的柱对悬浮液进行过滤测试。结果证实[此处原文似乎不完整，推测可能是某种物质]附着在赤堀土样品上。过滤测试后的[此处原文似乎不完整，推测可能是某种物质]释放测试结果表明，这种对赤堀土的附着可能是由磷介导的。
