Key Laboratory of Environmental Materials and Pollution Control, the Education Department of Jilin Province, Jilin Normal University, Siping, China.
College of Environmental Science and Engineering, Jilin Normal University, 1301 Haifeng Road, Siping, 136000, China.
Environ Sci Pollut Res Int. 2018 Oct;25(28):28562-28571. doi: 10.1007/s11356-018-2879-0. Epub 2018 Aug 8.
Hydrogel microparticles (HMPs) were synthesized via reverse emulsion/UV light polymerization and employed as adsorbents for removing bisphenol A (BPA) from aqueous solution. Results demonstrated the smooth surface of HMPs, with particle size ranging from 137 to 535 μm. Functional groups, including -OH, C-O, C=O, and C-H, are all involved in BPA adsorption confirmed by FTIR. Effect of solution pH, contact time, and initial BPA concentration on adsorption process was examined. The adsorption capacity was found pH independent below pH 8.0 and decreased when pH values greater than 8.0. The maximum adsorption capacity of the HMPs for BPA was 174.77 mg/g. The adsorption process achieved an equilibrium state within 30 min by the pseudo-second-order kinetic rather than the other kinetic models and was fitted well with the Freundlich linear isotherm model. Also, the obtained isotherms reflected the formation of S-type isotherm curve according to Giles's classification. The BPA loaded on the HMPs could be totally regenerated by methanol/dimethylsulfoxide and can be used for five cycles maintaining 100% of adsorption capacity. When the HMPs were applied for the treatment of spiked real surface water, excellent results were also achieved indicating the high efficiency and potential of the adsorbent.
水凝胶微球（HMPs）通过反相乳液/紫外光聚合合成，并用作从水溶液中去除双酚 A（BPA）的吸附剂。结果表明，HMPs 的表面光滑，粒径在 137 至 535μm 之间。通过傅里叶变换红外光谱（FTIR）证实，参与 BPA 吸附的官能团包括-OH、C-O、C=O 和 C-H。考察了溶液 pH 值、接触时间和初始 BPA 浓度对吸附过程的影响。在 pH 值低于 8.0 时，吸附容量与 pH 值无关，当 pH 值大于 8.0 时，吸附容量降低。HMPs 对 BPA 的最大吸附容量为 174.77mg/g。吸附过程在 30 分钟内通过拟二级动力学模型而不是其他动力学模型达到平衡状态，并且与 Freundlich 线性等温模型拟合良好。此外，根据 Giles 的分类，获得的等温线反映了 S 型等温线曲线的形成。负载在 HMPs 上的 BPA 可以通过甲醇/二甲基亚砜完全再生，并可用于五个循环，保持 100%的吸附容量。当 HMPs 用于处理实际地表水时，也取得了优异的效果，表明了该吸附剂的高效性和潜力。
