摘要
为确定产量高、数量大的林产加工废弃物——板栗壳及其改性天然高分子物质——板栗壳色素,在处理重金属废水中Ni(II)的应用前景,采用氨催化、热固法合成甲醛交联板栗壳色素树脂,通过振荡平衡批处理考察了pH值、吸附时间、初始浓度等因素对甲醛交联板栗壳色素吸附水中Ni(II)性能的影响,拟合了动力学模型和吸附平衡模型。结果表明:合成树脂吸附Ni(II)适宜pH值为7;在720 min内吸附达到平衡;吸附过程符合准二级动力学模型,以化学吸附为主导,粒内扩散并非唯一的限速步骤;平衡吸附模型符合Langmuir模型,饱和吸附量为19.80 mg·g^(-1);吸附过程是受熵驱动的自发吸热反应;甲醛交联板栗壳色素对水中Ni(II)吸附性能良好,在重金属处理中有广阔的应用前景。
In order to determine the application prospect of chestnut shell and its modified natural macromolecule pigment in the treatment of Ni(Ⅱ)in heavy metal wastewater,the resin of chestnut shell pigment cross-linked with formaldehyde was synthesized by ammonia catalysis and thermal curing.The effects of pH,adsorption time,initial concentration,and other factors on the adsorption performance of resin of chestnut shell pigment cross-linked with formaldehyde for Ni(II)in water were investigated.The kinetic model and adsorption equilibrium model were fitted.The results showed that the optimum pH for Ni(Ⅱ)adsorption by synthetic resin is 7.The adsorption reached equilibrium within 720 min.The adsorption process conforms to the quasi-second-order kinetic model.With chemisorption as the dominant,intra-particle diffusion is not the only rate-limiting step.The equilibrium adsorption model conforms to the Langmuir model.The saturated adsorption capacity is 19.80 mg·g^(-1).The adsorption process is a spontaneous endothermic reaction driven by entropy.Formaldehyde cross-linked chestnut shell pigment has a good adsorption property for Ni(II)in water and has a broad application prospect in heavy metal treatment.
作者
王思展
康海生
姚增玉
WANG Si-zhan;KANG Hai-sheng;YAO Zeng-yu(Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Southwest University of Forestry, Kunming, Yunnan 650224)
出处
《陕西林业科技》
2022年第1期1-6,共6页
Shaanxi Forest Science and Technology
基金
云南省农业基础研究联合专项(2018FG001-008)。
关键词
板栗壳色素
重金属
镍
吸附
Chestnut shell pigment
heavy metals
nickel
adsorption
