Research progress on preparation of amino-terminated hyperbranched

在重金属污染日益严重的今天,重金属污染的治理已经越来越受到广泛的关注。纤维素分子含有大量的羟基,但天然纤维素吸附能力并不好,通过化学改性后可成为性能良好的吸附剂。纤维素无污染、易生物降解、且来源广泛价格低廉,对其研究已成为该领域的热点,并已被广泛应用于重金属污染治理领域。超支化聚合物大分子作为一类制备工艺并不繁琐且容易得到树状高分子聚合物,其最大特点就是准球形的分子结构及末端官能团的可控性,其研究愈加受到关注。本文在文献综述的基础上,提出合成一种含有端氨基超支化合物结构的蔗渣改性重金属吸附剂的可行性技术设想。ABSTRACT: On account of the pollution problems caused by heavy metals becoming more and more serious, the technology of heavy metal treatment has received more and more attentions in nowadays. As an effective adsorbent, cellulosic materials were largely developed on industrial purpose being abundant in hydroxyl groups, but the adsorption ability of natural cellulose was still unsatisfactory for its large numbers of internal and interactive hydrogen bonds. Therefore, some modifications should be taken on the surface of cellulose molecular. Because of its unique properties of non-polluting, easily degradable, facile available, and low-cost, modified cellulose as heavy metal absorbent has already been intensively applied in separating and extracting of heavy metal ions from aqueous solution in this decade. Known as a type of dendritic polymers, the preparation processes of hyperbranched polymers are simple, and its torispherical molecular structure and terminal functional groups are controllable. Hence, the technology and development of these hyperbranched polymers are becoming more and more popular to current researchers. This paper reviewed the progress and proposed a feasible idea on synthesis of a containing amino terminated hyperbranched polymer structure of bagasse modification of heavy metal adsorbent.国家自然科学基金项目(41461092,41061044);广西自然科学基金项目(2012GXNSFAA053017

Photocatalytic Degradation of Cr （Ⅵ） and 2-Naphthol in Water Using Sulfur-doped TiO2 Catalyst

采用自制的S/Ti O2作为光催化剂,在可见光下进行光催化降解2-萘酚和还原Cr（VI）的实验。考察了S/Ti O2投加量、2-萘酚初始浓度和p H值对2-萘酚降解光催化性能的影响及Cr（VI）~2-萘酚混合体系光催化反应的研究。结果表明：S/Ti O2投加量为2.0 g/L,2-萘酚溶液初始浓度18.75 mg/L,p H值为6~7时2-萘酚光催化降解效果最好;混合体系中的2-萘酚的降解率及Cr（VI）还原率均较相应的单一体系高,Cr（VI）的还原与2-萘酚的氧化之间产生了协同效应。Cr（VI）和2-萘酚的光催化反应均为拟一级反应动力学。Photocatalytic degradation of 2-naphthol and reduction of Cr（Ⅵ） was studied by using sulfur-doped TiO2 as photo catalyst and visible light as light source. The influences of the dosage of catalyst, initial concentration of 2-naphthol and pH were investigated and study on visible photocatalytic of Cr（Ⅵ） -2-naphthol compound system. The optimum conditions are found： the proper dosage of sulfur -doped TiO2 catalyst is 2.0 g/L, concentration of 2-naphthol is 18.75 mg/L and pH = 6 - 7. In Cr （Ⅵ） - 2-naphthol compound system, 2-naphthol and Cr （VI） were more efficiently eliminated than in the single 2-naphthol or Cr（VI） system. The reduction of Cr（VI） and the oxidation of 2-naphthol produced a synergistic effect. The photocatalytic reduction of Cr（VI） and oxidation of 2-naphthol followed the pseudo first order reaction kinetics.国家自然科学基金项目(41061044,41461092);广西自然科学基金面上项目(2012GXNSFAA053017);广西林产化学与工程协同创新中心基金项目(2013A10);广西民族大学研究生教育创新计划项目(gxun-chx2014095)资