通过吸附实验,考察鱼鳞投入量、结晶紫初始浓度和溶液pH等因素对罗非鱼鳞吸附水中结晶紫性能的影响,并通过红外光谱、BET比表面积、扫描电镜、吸附动力学和吸附等温线来分析吸附机理。结果表明:当溶液pH为7、温度30℃,吸附剂投加量为3g/L、吸附时间为20min,结晶紫浓度为40mg/L时,吸附效果最好,结晶紫的吸附率和吸附容量可分别达到66.69％和8.27mg/g;鱼鳞对结晶紫的吸附过程符合Lagergren准二级动力学模型,吸附过程属于物理吸附;吸附等温线符合Freundlich吸附等温式,当温度30℃时鱼鳞对结晶紫的最大吸附量为18.9mg/g;且罗非鱼鱼鳞中的胶原蛋白和羟基鳞灰石均参与了结晶紫染料的吸附。
A adsorbent was prepared from fish scale of tilapia and the effects of adsorbent dosage,initial concentration of crystal violet,time and solution pH value on the adsorption property were investigated.The absorption mechanism of sorbent were studied by use of kinetic,FT-IR assay,BET and SEM as well.The results showed that when the absorbent dosages was 3g/L,pH=7,30℃,the initial concentration of crystal violet was 40mg/L and adsorption time was 20min,the rate of adsorption of crystal violet was up to 66.69% while the adsorption capacity reached 8.27mg/g.The adsorption of crystal violet on the tilapia fish scales agreed with physical adsorption process,and followed the Lagergren pseudo-second-order kinetics equation.The equilibrium adsorption data of crystal violet on tilapia fish scales could be described by the Freundlich isotherm models,when T=30℃,the max adsorption capacity of crystal violet(qmax) was 18.9mg/g.The infrared analysis showed that protein and hydroxyapatite of fish scales all participated in the crystal violet absorption.
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基金资助
茂名市科技立项项目[茂科字(2016)9号20160008]
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