Science Department, Rustaq College of Education, University of Technology and Applied Sciences, Al Rustaq, Oman.
Department of Engineering, College of Engineering and Technology, University of Technology and Applied Sciences, Suhar, Oman.
Environ Sci Pollut Res Int. 2023 Aug;30(38):88704-88723. doi: 10.1007/s11356-023-28530-9. Epub 2023 Jul 13.
The objective of this study is to investigate the efficiency of two processes for the amoxicillin removal through static (batch) adsorption and photocatalytic degradation onto the prepared samples. Three solid materials as photocatalyst and/or adsorbent were synthesized viz. nanotitanium dioxide (NT) prepared by the sol-gel method, scallop shells-based nanohydroxyapatite (NP), and nanotitanium dioxide/nanohydroxyapatite composite (NTP). The physicochemical and morphological properties of the prepared samples were tested by TGA, XRD, DRS, ATR-FTIR, nitrogen adsorption/desorption isotherm, zeta potential, SEM, and TEM. The major operational conditions were optimized for catalyst or adsorbent mass, pH, shaking time, initial amoxicillin (AMX) concentration, power of UV lamp, and temperature. The results illuminated that NTP achieved the highest adsorption capacity (88.46 mg/g) at 20 ℃ and AMX adsorption onto all the solid materials was well applied by Langmuir, Temkin, pseudo-second order, and Elovich models. The maximum desorption percent (98%) was attained by acetone. The degradation percent of AMX reached 85.3 and 99.5% for NT and NTP, respectively, using 0.9 g/L of catalyst dosage through 90 min. AMX photodegradation onto the catalysts' surface was well fitted by Langmuir-Hinshelwood, Arrhenius, and Eyring-Polanyi models with endothermic, physical, and nonspontaneous nature of photocatalysis process. NTP acts as a promising adsorbent and photocatalyst for the antibiotics' removal in wastewater.
本研究的目的是研究两种工艺去除阿莫西林的效率，即通过静态（批处理）吸附和光催化降解作用于制备的样品。合成了三种固体材料作为光催化剂和/或吸附剂，即溶胶-凝胶法制备的纳米二氧化钛（NT）、贝壳基纳米羟基磷灰石（NP）和纳米二氧化钛/纳米羟基磷灰石复合材料（NTP）。采用 TGA、XRD、DRS、ATR-FTIR、氮吸附/解吸等温线、动电位、SEM 和 TEM 对制备样品的物理化学和形态特性进行了测试。优化了催化剂或吸附剂质量、pH、搅拌时间、初始阿莫西林（AMX）浓度、UV 灯功率和温度等主要操作条件。结果表明，NTP 在 20℃时达到了最高的吸附容量（88.46mg/g），所有固体材料对 AMX 的吸附均适用 Langmuir、Temkin、伪二阶和 Elovich 模型。用丙酮达到的最大解吸百分比（98%）。NT 和 NTP 分别使用 0.9g/L 的催化剂剂量在 90min 内可将 AMX 的降解率达到 85.3%和 99.5%。AMX 在催化剂表面的光降解很好地符合 Langmuir-Hinshelwood、Arrhenius 和 Eyring-Polanyi 模型，具有吸热、物理和非自发的光催化过程性质。NTP 是一种很有前途的用于去除废水中抗生素的吸附剂和光催化剂。
