• 关键词：壳聚糖纤维  芦荟大黄素  吸附性能  抑藻

• 基金项目：天津市科技计划项目（No.18YFJLCG00120）；天津市海洋资源与化学重点实验室（天津科技大学）开放基金资助项目（No. 201808）

• 董泽樟
• 天津科技大学， 化工与材料学院，天津 300457;江苏正大丰海制药有限公司，南京 210000

• 叶建州
• 中交一航局生态工程有限公司，深圳 518107

• 薛舒心
• 天津科技大学， 化工与材料学院，天津 300457

• 曹井国
• 天津科技大学， 化工与材料学院，天津 300457

• 摘要：针对蓝藻水华问题，选取壳聚糖纤维和芦荟大黄素为原材料，制备了负载芦荟大黄素的壳聚糖纤维（CS-AE纤维）.研究了壳聚糖纤维对芦荟大黄素的吸附效果以及复合材料对铜绿微囊藻的生长抑制能力.结果表明，芦荟大黄素可以有效地负载到壳聚糖纤维上，吸附过程符合准二级动力学模型和Freundlich等温线模型，属于化学吸附.吸附平衡时间为240 min，最适吸附温度为30 ℃，芦荟大黄素的初始浓度为100 mg·L^-1时，实际吸附量为19.06 mg·g^-1.抑藻实验表明，CS-AE纤维能够有效地抑制铜绿微囊藻的生长，当投加量为0.6 g·L^-1时，第12 d的抑藻率可达77.6%.实验期间，处理组中藻细胞膜结构发生改变，丙二醛（MDA）含量显著增加；叶绿素a、类胡萝卜素和藻胆蛋白含量逐渐下降，其中对藻胆蛋白的抑制率显著高于对叶绿a和类胡萝卜素的抑制率.藻细胞的超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性均呈先升高后降低的趋势；此外，CS-AE纤维能够有效去除藻毒素.综上推断，CS-AE纤维通过破坏铜绿微囊藻的细胞结构，光合系统，以及引起抗氧化系统失衡，造成氧化损伤，是其抑制作用的主要机理.

• Abstract：Facing the problem of cyanobacteria bloom， this study selected chitosan fiber and aloe-emodin as its raw materials to prepare CS-AE fiber， a hybrid material with strong algae-inhibiting properties. The adsorption of aloe-emodin by chitosan fiber and the growth inhibition against Microcystis aeruginosa by hybrid material were studied. The results showed that aloe-emodin can be effectively adsorbed by chitosan fibers， the adsorption process of which followed the quasi-second-order kinetic model and Freundlich isotherm， and thus it belongs to chemical adsorption. The adsorption equilibrium time and optimal adsorption temperature were about 240 min and 30 ℃， respectively； the adsorption capacity was 19.06 mg·g^-1 when the initial concentration of AE was 100 mg·L^-1. Results showed that CS-AE fiber can effectively inhibit the growth of Microcystis aeruginosa. When the dosage was 0.6 g·L^-1， the inhibition rate could reach 77.6% after 12 days. The cell membrane of the algae was destroyed while the MDA content increased significantly. The content of chlorophyll a， carotenoids and phycobiliproteins in the treatment group gradually decreased， and the inhibition rate against phycobiliprotein was significantly higher than that of chlorophyll a and carotenoids. The activities of superoxide dismutase （SOD） and catalase （CAT） in algal cells increased first and then decreased； in addition， CS-AE fiber can effectively remove algal toxins. In conclusion， the cell structure and photosynthetic system of Microcystis aeruginosa was destroyed by CS-AE fiber， leading to the imbalance of the antioxidant system and causing oxidative damage， which is the main inhibitory mechanism.

• Key words：chitosan fiber  aloe-emodin  adsorption  algae inhibition

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