摘要
牛皮经胃蛋白酶水解后提取胶原,通过胶原-黑荆树单宁-醛反应制备了胶原-单宁树脂(C-TR)吸附材料,并系统研究了其对水体中Pb(Ⅱ)的吸附特性。结果表明,C-TR对Pb(Ⅱ)有较强的吸附能力。当温度为303 K、pH值为4.5、Pb(Ⅱ)溶液(100 mL)的初始浓度为1.0 mmol/L时,C-TR(100 mg)对Pb(Ⅱ)的吸附容量达到0.34 mmol/g。pH值对吸附容量的影响较大,最佳吸附pH值为4.5。C-TR对Pb(Ⅱ)的吸附平衡符合Freundlich方程,温度对吸附平衡影响不大。吸附动力学可用拟二级速率方程来描述。固定床吸附表明,当1.0 mmol/L的Pb(Ⅱ)溶液以30 mL/h的流速流过床层时,流出液的体积约为60 mL时达到穿透点。
Collagen was extracted by enzymatic hydrolysis of bovine hide using pepsin. The collagen-tannin resin （C-TR） was prepared via reaction of collagen with black wattle tannin and aldehyde. The adsorption behaviors of C-TR to Pb（Ⅱ） in aqueous solution was investigated. It was found that C-TR has high adsorption capacity to Pb（Ⅱ）. The adsorption capacity of C-TR （100 mg） to Pb（Ⅱ） was 0.34 mmol/g at 303 K and pH value 4.5 when the initial concentration of Pb（Ⅱ） solution （ 100 mL） was 1.0 mmol/L. The pH value had a significant effect on the adsorption capacity of C-TR to Pb （Ⅱ） and a maximal adsorption capacity was achieved around pH value 4.5. The adsorption isotherms can be described by Freundlich equation, and temperature has almost no effect on adsorption capacity. Adsorption kinetics data can be described by a pseudo-second-order equation. The breakthrough point of Pb （Ⅱ） in adsorption column was around 60 mL when feeding rate of Pb （Ⅱ） solution （ 1.0 mmol/L） was 30 mL/h.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2010年第2期11-16,共6页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(20536030)
四川省科技支撑计划项目(2008GZ0026)
"十一五"国家科技支撑计划资助(2006BAC02A09)
