Huang Guofu, Wang Mianmian, Hu Yongyou, Lv Sihao, Li Changfang
School of Environment and Energy, South China University of Technology, the Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, PR China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, PR China.
PLoS One. 2017 Mar 29;12(3):e0174589. doi: 10.1371/journal.pone.0174589. eCollection 2017.
In this study, two kinds of cellulose derivatives (polyanionic cellulose (PAC) and hydroxypropylmethyl cellulose (HPMC)) were selected as stabilizers of Pd/Fe nanoparticles (NPs) to investigate their influences on the debromination performances of 2,2',4,4'-tretrabromodiphenyl ether (BDE47). Field emission scanning electron microscope (FE-SEM) images revealed that the cellulose-stabilized Pd/Fe NPs were smaller and more uniform than the bare-Pd/Fe NPs. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) results suggested that cellulose coatings found on Pd/Fe NPs surfaces featured some antioxidation abilities, which followed the order of HPMC < PAC. Sedimentation tests demonstrated that the stabilizing power of PAC for Pd/Fe NPs was higher than that of HPMC. Fourier transfer infrared spectrometer (FTIR) results indicated that PAC molecules were bound to the Pd/Fe NPs surfaces by polar covalent bonds and hydrogen bonds, while HPMC molecules interacted with the nanoparticles by hydrogen bonds. Batch debromination test for BDE47 demonstrated that the catalytic debromination rate with cellulose-stabilized Pd/Fe NPs was higher than that with bare-Pd/Fe NPs during reaction period of 15 min. Overall, this study indicated that both celluloses are beneficial to forming smaller, more regular, stable and antioxidative Pd/Fe NPs, leading to higher debromination reactivity for BDE47 compared with the bare-Pd/Fe NPs. Therefore Pd/Fe NPs can be utilized as a promising remediation technology for the contaminated groundwater and soils.
在本研究中，选择了两种纤维素衍生物（聚阴离子纤维素（PAC）和羟丙基甲基纤维素（HPMC））作为钯/铁纳米颗粒（NPs）的稳定剂，以研究它们对2,2',4,4'-四溴二苯醚（BDE47）脱溴性能的影响。场发射扫描电子显微镜（FE-SEM）图像显示，纤维素稳定的钯/铁纳米颗粒比裸露的钯/铁纳米颗粒更小且更均匀。X射线衍射仪（XRD）和X射线光电子能谱（XPS）结果表明，在钯/铁纳米颗粒表面发现的纤维素涂层具有一定的抗氧化能力，其顺序为HPMC < PAC。沉降试验表明，PAC对钯/铁纳米颗粒的稳定能力高于HPMC。傅里叶变换红外光谱仪（FTIR）结果表明，PAC分子通过极性共价键和氢键与钯/铁纳米颗粒表面结合，而HPMC分子通过氢键与纳米颗粒相互作用。对BDE47的批量脱溴试验表明，在15分钟的反应期内，纤维素稳定的钯/铁纳米颗粒的催化脱溴率高于裸露的钯/铁纳米颗粒。总体而言，本研究表明，两种纤维素都有利于形成更小、更规则、稳定且具有抗氧化性的钯/铁纳米颗粒，与裸露的钯/铁纳米颗粒相比，对BDE47具有更高的脱溴反应活性。因此，钯/铁纳米颗粒可作为一种有前景的受污染地下水和土壤修复技术。
