CAJ | 학술논문

采用HNO3/H3 PO4-NaNO2氧化体系制备了氧化纤维素,通过红外光谱、固体13C NMR对其结构进行表征,用酸碱中和滴定法测定了产物的羧基含量。同时以氧化纤维素为吸附剂,研究了对水中内分泌干扰物双酚A( BPA)的吸附性能。结果表明：该氧化体系能很好的选择性氧化纤维素的C6位伯羟基,含羧基为20%。在298 K时,氧化纤维素对双酚A最大吸附量为12.67 mg/g,吸附平衡时间为30 min,平衡吸附量随双酚A浓度增加而增加；溶液接近中性及低温条件有利于吸附的进行,溶液中存在电解质则不利于吸附的进行。双酚A的吸附过程属于单分子层吸附,以化学吸附为主,符合准二级动力学方程和Langmuir吸附等温模型。
채용HNO3/H3 PO4-NaNO2양화체계제비료양화섬유소,통과홍외광보、고체13C NMR대기결구진행표정,용산감중화적정법측정료산물적최기함량。동시이양화섬유소위흡부제,연구료대수중내분비간우물쌍분A( BPA)적흡부성능。결과표명：해양화체계능흔호적선택성양화섬유소적C6위백간기,함최기위20%。재298 K시,양화섬유소대쌍분A최대흡부량위12.67 mg/g,흡부평형시간위30 min,평형흡부량수쌍분A농도증가이증가；용액접근중성급저온조건유리우흡부적진행,용액중존재전해질칙불리우흡부적진행。쌍분A적흡부과정속우단분자층흡부,이화학흡부위주,부합준이급동역학방정화Langmuir흡부등온모형。
The oxidized cellulose ( OC ) was prepared by HNO3/H3 PO4-NaNO2 oxidation system. The structure of OC was characterized by FT-IR spectroscopy and solid-state 13C NMR , and the carboxyl content was determined by acid-base titration method in present study. Meanwhile, the prepared OC was used as adsorbent and its adsorption properties for bisphenol A ( BPA) were investigated. The results revealed that the C6 primary hydroxyl groups of cellulose were selectively oxidized to carboxyl groups by this oxidation system, and the carboxyl content was about 20%. The adsorption equilibrium time was about 30 min at 298 K, and the maximum adsorption capacity ( qm ) of OC for BPA was 12. 67 mg/g. The adsorption capacity increased with the increase of initial BPA concentration. Neutral condition and low temperature were benificial for adsorption, but the presence of electrolytes in the solution was negative for the adsorption of BPA. The adsorption of BPA on OC was considered as a monolayer adsorption and chemisorption process . The adsorption kinetics followed the second-order equation. Langmuir model fitted the equilibrium data better than the Freundlich isotherm.