Kinoshita Hiroyuki, Sasaki Koya, Yasui Kentaro, Miyakawa Yuko, Yuji Toshifumi, Misawa Naoaki, Mungkung Narong
Department of Engineering, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki 889-2192, Japan.
Suzuki Motor Corporation, 300 Takatsuka-cho, Minami-ku, Hamamatsu City 432-8611, Shizuoka Prefecture, Japan.
Polymers (Basel). 2021 Sep 18;13(18):3172. doi: 10.3390/polym13183172.
The effective reuse of waste glass fiber-reinforced plastic (GFRP) is desired. We previously produced porous ceramics by firing mixtures of crushed GFRP and clay in a reducing atmosphere and demonstrated their applicability as adsorbents for the removal of basic dyes from dyeing wastewater. However, the primary influencing factors and the dye adsorption mechanism have not been fully elucidated, and the adsorption of acidic and direct dyes has not been clarified. In this study, adsorption tests were conducted, and the effects of the firing atmosphere, specific surface area, type of dye, and individual components were comprehensively investigated. The results showed that reductively fired ceramics containing plastic carbide residue adsorbed basic dye very well but did not adsorb acidic dye well. The clay structure was the primary factor for the dye adsorption rather than the GFRP carbide. The mechanism for the basic dye adsorption appears to have been an increase in specific surface area due to the plastic carbide residue in the ceramic structure, which increased the ion exchange between the clay minerals and the dye. By adjusting the pH of the aqueous solution, the GFRP/clay ceramic also adsorbed considerable amounts of direct dye, so the mechanism was determined to be ion exchange with the calcium component of the glass fibers.
人们期望对废弃玻璃纤维增强塑料（GFRP）进行有效再利用。我们之前通过在还原气氛中烧制粉碎后的GFRP与粘土的混合物制备了多孔陶瓷，并证明了它们作为吸附剂用于去除印染废水中碱性染料的适用性。然而，主要影响因素和染料吸附机制尚未完全阐明，酸性和直接染料的吸附情况也未明确。在本研究中，进行了吸附试验，并综合研究了烧制气氛、比表面积、染料类型和各组分的影响。结果表明，含有塑料碳化物残渣的还原烧制陶瓷对碱性染料吸附良好，但对酸性染料吸附不佳。粘土结构是染料吸附的主要因素，而非GFRP碳化物。碱性染料的吸附机制似乎是由于陶瓷结构中的塑料碳化物残渣导致比表面积增加，从而增加了粘土矿物与染料之间的离子交换。通过调节水溶液的pH值，GFRP/粘土陶瓷也能吸附相当数量的直接染料，因此确定其机制为与玻璃纤维中的钙成分进行离子交换。
