胶原纤维固化黑荆树单宁对La3＋的吸附特性研究  

Research on Adsorption Property of Rare Earth Elements by Black Wattle Tanins Immobilized on Collagen Fiber

作　　者：刘方[1] 何春光[1] 廖学品[2] 赵仕林[1] 

机构地区：[1]四川师范大学化学与材料科学学院,四川成都610068 [2]四川大学皮革化学与工程教育部重点实验室,四川成都610065

出　　处：《稀土》2008年第2期35-38,75,共5页Chinese Rare Earths

基　　金：重大基础前期研究专项(2004CCA06100)

摘　　要：以皮胶原纤维为基质,通过醛交联剂将黑荆树单宁固化在胶原纤维上组装成超分子吸附材料,研究该吸附材料对La3+的吸附特性。实验表明,该吸附材料对La3+的吸附平衡符合Freundlich方程式;其平衡吸附量受pH值影响较大,在pH3.0~5.0范围内,其吸附量随pH升高而增加,在pH≥5时,吸附量开始下降;其吸附量对温度影响不敏感,在293K^313K时,La3+的吸附平衡量随温度变化不大,但当温度超过313K时,平衡吸附量开始下降。吸附动力学可用拟二级速度方程来描述,由拟二级速率方程计算所得到的吸附平衡量与实测值的偏差在±3.5%以内,具有较好的一致性。Using collagen fiber as matrices, the immob＇dized tannins based on black wattle was prepared through aldehyde cross - linking reaction. The adsorption property to La3 ＋ was studied in this paper. Experiments showed that the adsorption capacity of the novel adsorbent to La3＋ was related to pH value and temperature of solution. The effect of pH value was significant, in the adsorption pH value range of 3.0 - 5.0, the adsorption capacity would be rised with the increase of pH. When pH value higher than 5.0,the adsorption capacity began to decrease. When temperature was from 293K to 313K, the variation of adsorption capacity to La3＋ was not obvious. When the adsorption temperature over 313K, the adsorption capacity would decrease greatly. The adsorption kinetics data was well fitted by pseudo - second - order rote model, and the equillrium adsorption capacities calculated by pseudo - second - order rate model was nearly as same as the data actually determined with error 3.5%.

关 键 词：固化黑荆树单宁 La3+吸附 特性 

分 类 号：O614.33[理学—无机化学] O647.3[理学—化学]