摘要
为了解决工业废水铅Pb(Ⅱ)污染问题,以海藻酸钠和大豆蛋白为原料,制备了具有多孔结构的大豆蛋白基多孔凝胶球,并用于对模拟废水Pb(Ⅱ)的去除研究。利用扫描电子显微镜(SEM)、比表面积及孔隙分析仪、Zeta电位仪和X射线光电子能谱(XPS)对多孔凝胶球的形貌、多孔结构、表面电荷和元素组成进行了表征,并探讨了溶液pH、吸附时间、吸附剂用量、铅离子初始浓度等因素对大豆蛋白基多孔凝胶球吸附Pb(Ⅱ)的吸附容量和脱除效率的影响。结果表明,在pH>2.9的条件下,大豆蛋白基多孔凝胶球表面带负电,能够通过凝胶球内部的多孔通道上的吸附位点有效地吸附带正电的Pb(Ⅱ)离子,最高脱除效率可达99%,能循环使用。通过对吸附数据进行3种动力学模型(准一级动力学、准二级动力学和颗粒内扩散模型)和两种等温模型(Langmuir和Freundlich模型)的拟合分析,发现吸附过程符合准二级动力学模型,且遵循Langmuir单分子层吸附机制,最大吸附容量为264.01 mg·g^(-1)。表明,大豆蛋白基多孔凝胶球能对模拟废水中的Pb(Ⅱ)进行高效吸附。
In order to solve the problem of Pb(Ⅱ)pollution in industrial wastewater,soybean protein based porous gel beads with porous structure were prepared using sodium alginate and soybean protein as raw materials,and were used to remove Pb(Ⅱ)from simulated wastewater.The morphology,porous structure,surface charge and element composition of porous gel beads were characterized by scanning electron microscope(SEM),specific surface area and porosity analyzer,zeta potentiometers and x-ray photoelectron spectroscopy(XPS).The effects of solution pH,adsorption time,amount of adsorbent,initial concentration of lead ion and other factors on the adsorption capacity and removal efficiency of Pb(Ⅱ)on soy protein based porous gel spheres were also discussed.The results showed that under the condition of pH>2.9,the surface of soybean protein based porous gel bead was negatively charged,which could effectively absorb positively charged Pb(Ⅱ)ions through the adsorption sites on the porous channels inside the gel bead.The highest removal rate was 99%,which could be recycled.Through fitting analysis of three kinetic models(quasi first order kinetics,quasi second order kinetics and intra particle Diffusion model)and two isothermal models(Langmuir and Freundlich models)for the adsorption data,it was found that the adsorption process conforms to the quasi second order kinetic model and follows the Langmuir monolayer adsorption mechanism,and the maximum adsorption capacity was 264.01 mg·g^(-1).The above results show that soybean protein based porous gel beads can efficiently adsorb Pb(Ⅱ)in simulated wastewater.
作者
刘锋
黄钦裕
陈燕舞
LIU Feng;HUANG Qinyu;CHEN Yanwu(College of Light Chemical Industry and Materials Engineering,Shunde Polytechnic,Foshan 528300,China)
出处
《黑龙江农业科学》
2023年第11期100-107,共8页
Heilongjiang Agricultural Sciences
基金
广东省普通高校重点领域项目(2022ZDZX4119)
广东省科技创新战略专项资金(pdjh2023b1073)
广东省普通高校创新团队项目(2020KCXTD057)。
关键词
大豆蛋白
海藻酸钠
多孔
铅
吸附
soybean protein
sodium alginate
porous
Pb
adsorption
