Zhu Xiaoyan, Tong Jiaqi, Lan Hangzhen, Pan Daodong
State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo 315211, China.
State Key Laboratory of Food Contact Material Testing, Ningbo Academy of Inspection and Quarantine, Ningbo 315048, China.
Polymers (Basel). 2022 Feb 13;14(4):720. doi: 10.3390/polym14040720.
Diclofenac sodium (DS), one of the most used non-steroidal anti-inflammatory drugs worldwide, is often detected in wastewater and natural water. This drug is ecotoxic, even at low concentrations. Therefore, it is essential to fabricate low-cost adsorbents that can easily and effectively remove DS from contaminated water bodies. In this study, a polyethyleneimine (PEI)-modified magnetic cellulose nanocrystal (MCNC) was prepared with a silane coupling agent as a bridge. TEM, FTIR, XRD, and VSM were used to demonstrate the successful preparation of MCNC-PEI. This composite adsorbent exhibited efficient DS removal. Furthermore, the adsorption performance of MCNC-PEI on DS was optimal under mildly acidic conditions (pH = 4.5). Adsorption kinetics showed that the adsorption process involves mainly electrostatic interactions. Moreover, the maximum adsorption capacity reached 299.93 mg/g at 25 °C, and the adsorption capacity only decreased by 9.9% after being reused five times. Considering its low cost, low toxicity, and high DS removal capacity, MCNC-PEI could be a promising adsorbent for treating DS-contaminated water.
双氯芬酸钠（DS）是全球使用最广泛的非甾体抗炎药之一，经常在废水和天然水中被检测到。这种药物即使在低浓度下也具有生态毒性。因此，制造能够轻松有效地从受污染水体中去除DS的低成本吸附剂至关重要。在本研究中，以硅烷偶联剂为桥梁制备了聚乙烯亚胺（PEI）改性的磁性纤维素纳米晶体（MCNC）。使用透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和振动样品磁强计（VSM）来证明MCNC-PEI的成功制备。这种复合吸附剂表现出高效的DS去除能力。此外，MCNC-PEI对DS的吸附性能在弱酸性条件（pH = 4.5）下最佳。吸附动力学表明，吸附过程主要涉及静电相互作用。此外，在25℃时最大吸附容量达到299.93 mg/g，重复使用五次后吸附容量仅下降了9.9%。考虑到其低成本、低毒性和高DS去除能力，MCNC-PEI可能是一种用于处理受DS污染水的有前景的吸附剂。
