School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, Guangxi, China.
School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, Guangxi, China.
Environ Sci Pollut Res Int. 2023 May;30(25):67758-67770. doi: 10.1007/s11356-023-27273-x. Epub 2023 Apr 28.
Endocrine-disrupting compounds (EDCs) are increasingly polluting water, making it of practical value to develop novel desirable adsorbents for removing these pollutants from wastewater. Here, a simple cross-linking strategy combined with gentle chemical activation was demonstrated to prepare starch polyurethane-activated carbon (STPU-AC) for adsorbing BPA in water. The adsorbents were characterized by various techniques such as FTIR, XPS, Raman, BET, SEM, and zeta potential, and their adsorption properties were investigated comprehensively. Results show that STPU-AC possesses a large surface area (1862.55 m·g) and an abundance of functional groups, which exhibited superior adsorption capacity for BPA (543.4 mg·g) and favorable regenerative abilities. The adsorption of BPA by STPU-AC follows a pseudo-second-order kinetic model and a Freundlich isotherm model. The effect of aqueous solution chemistry (pH and ionic strength) and the presence of other contaminants (phenol, heavy metals, and dyes) on BPA adsorption was also analyzed. Moreover, theoretical studies further demonstrate that hydroxyl oxygen and pyrrole nitrogen are the primary adsorption sites. We found that the efficient recovery of BPA was associated with pore filling, hydrogen-bonding interaction, hydrophobic effects, and π-π stacking. These findings demonstrate the promising practical application of STPU-AC and provide a basis for the rational design of starch-derived porous carbon.
内分泌干扰物（EDCs）日益污染水源，因此开发新型理想吸附剂来去除废水中的这些污染物具有实际价值。在这里，展示了一种简单的交联策略，结合温和的化学活化，用于制备用于水中吸附 BPA 的淀粉聚氨酯活性炭（STPU-AC）。通过各种技术对吸附剂进行了表征，例如 FTIR、XPS、拉曼、BET、SEM 和 ζ 电位，并对其吸附性能进行了全面研究。结果表明，STPU-AC 具有较大的表面积（1862.55 m·g）和丰富的官能团，对 BPA 表现出优异的吸附能力（543.4 mg·g）和良好的可再生能力。STPU-AC 对 BPA 的吸附符合准二级动力学模型和 Freundlich 等温模型。还分析了水溶液化学（pH 和离子强度）和其他污染物（苯酚、重金属和染料）对 BPA 吸附的影响。此外，理论研究进一步表明，羟基氧和吡咯氮是主要的吸附位点。我们发现，BPA 的有效回收与孔填充、氢键相互作用、疏水效应和 π-π 堆积有关。这些发现表明 STPU-AC 具有有前途的实际应用，并为淀粉衍生多孔碳的合理设计提供了基础。
