Yan Xu, Zhang Qicai, Rao Qinxiong, Chen Shanshan, Wang Xianli, Song Wei, Cheng Lin, Guan Shuhui, Song Weiguo
Institute for Agri-Food Standards and Testing Technology, Shanghai Academy of Agricultural Science, Shanghai 201403, China.
College of Food Sciences, Shanghai Ocean University, Shanghai 201306, China.
Materials (Basel). 2022 Jun 24;15(13):4445. doi: 10.3390/ma15134445.
Nonylphenol (NP) is considered to be an environmentally toxic, endocrine-disrupting chemical that affects humans and ecosystems. Adsorption is one of the most promising approaches for the removal of nonylphenol contamination from water. Herein, in order to design an adsorbent with high adsorption capacity, magnesium silicate with different Mg/Si ratios was successfully synthesized by a sol-gel method at 60 °C. Magnesium silicate with a Mg/Si ratio of 1:6 was found to possess the best adsorption performance, with maximum 4-NP sorption 30.84 mg/g under 25 °C and 0.2 g/L adsorbent dose. The adsorption was negatively affected by increasing adsorbent dose and temperature. The kinetics and isotherm of 4-NP adsorption by Mg/Si were well described by the pseudo-second-order and Sips model, respectively, and behavior was proven to be physisorption-enhanced by a chemical effect. Detailed characterization by XRD, BET, and SEM confirmed that the magnesium silicate possesses an amorphous, mesoporous structure. The study will contribute to the applicability of cheap magnesium silicate for removal of NP contamination in water.
壬基酚（NP）被认为是一种对环境有毒的内分泌干扰化学物质，会影响人类和生态系统。吸附是从水中去除壬基酚污染物最有前景的方法之一。在此，为了设计一种具有高吸附容量的吸附剂，通过溶胶 - 凝胶法在60°C成功合成了具有不同Mg/Si比的硅酸镁。发现Mg/Si比为1:6的硅酸镁具有最佳吸附性能，在25°C和0.2 g/L吸附剂剂量下，对4 - NP的最大吸附量为30.84 mg/g。吸附受到吸附剂剂量增加和温度升高的负面影响。Mg/Si对4 - NP吸附的动力学和等温线分别由伪二级模型和Sips模型很好地描述，并且其行为被证明是由化学效应增强的物理吸附。通过XRD、BET和SEM进行的详细表征证实，硅酸镁具有无定形的介孔结构。该研究将有助于廉价硅酸镁在去除水中NP污染方面的应用。
