Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia (UPM), Serdang 43400, Malaysia.
Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia (UPM), Serdang 43400, Malaysia; Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia (UPM), Serdang 43400, Malaysia.
Water Sci Technol. 2021 Jul;84(1):237-250. doi: 10.2166/wst.2021.204.
In this paper, the adsorptive performance of synthesized thiourea (TU) modified poly(acrylonitrile-co-acrylic acid) (TU-P(AN-co-AA)) polymeric adsorbent for capturing p-nitrophenol (PNP) from aqueous solution was investigated. TU-P(AN-co-AA) was synthesized via the redox polymerization method with acrylonitrile (AN) and acrylic acid (AA) as the monomers, then modified chemically with thiourea (TU). Characterization analysis with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), elemental microanalysis for CHNS, zeta potential measurement, Brunauer-Emmett-Teller (BET) surface analysis and thermal analyses were carried out to determine the morphology and physico-chemical properties of the synthesized polymer. The characterization results indicated successful surface modification of polymer with TU. The performance of TU-P(AN-co-AA) for the removal of PNP was investigated under various experimental parameters (adsorbent dosage, initial adsorbate concentration, contact time and temperature). The results demonstrated that the Freundlich isotherm model and pseudo-second-order kinetic model best described the equilibrium and kinetic data, respectively. Thermodynamic studies showed that the uptake of PNP by TU-P(AN-co-AA) was spontaneous and exothermic in nature. The results of the regeneration studies suggested that the TU-P(AN-co-AA) polymer is a reusable adsorbent with great potential for removing PNP from wastewater.
本文研究了合成的硫脲（TU）修饰的聚丙烯腈-共-丙烯酸（TU-P（AN-co-AA））聚合物吸附剂对水溶液中对硝基苯酚（PNP）的吸附性能。TU-P（AN-co-AA）通过氧化还原聚合方法合成，以丙烯腈（AN）和丙烯酸（AA）为单体，然后用硫脲（TU）进行化学修饰。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、CHNS 元素微分析、zeta 电位测量、Brunauer-Emmett-Teller（BET）表面分析和热分析对合成聚合物的形态和物理化学性质进行了表征分析。表征结果表明，聚合物表面成功地进行了 TU 修饰。研究了不同实验参数（吸附剂用量、初始吸附质浓度、接触时间和温度）下 TU-P（AN-co-AA）对 PNP 的去除性能。结果表明，Freundlich 等温模型和拟二级动力学模型分别很好地描述了平衡和动力学数据。热力学研究表明，TU-P（AN-co-AA）对 PNP 的吸附是自发的和放热的。再生研究结果表明，TU-P（AN-co-AA）聚合物是一种可重复使用的吸附剂，具有从废水中去除 PNP 的巨大潜力。
