沙棘枝条富含木质纤维素,填埋、焚烧会污染环境而且浪费资源。为充分利用闲置沙棘枝资源,采用己二酸二酰肼(ADH)为改性剂,对沙棘枝条粉(SBP)进行改性,制得ADH改性的沙棘枝条粉(ADH@SBP)。通过扫描电镜和傅里叶变换红外光谱仪对ADH@SBP产品的形貌和结构进行表征。将ADH@SBP应用于吸附去除水中茜素红S,考察了pH、温度和时间等因素对ADH@SBP吸附茜素红S的影响。结果表明:ADH@SBP吸附茜素红S的最佳条件在pH=2,温度为50℃。吸附过程符合准二级动力学吸附模型。
Sea buckthorn branches are composed of ample lignocelluloses.The traditional treatment for these,like discarding outside or burning are characterized by serious resource waste and environmental pollution.Adipic acid hydrazide (ADH) was used as modifier.The ADH@SBP was prepared by decorating sea buckthorn branch powder (SBP) with adipic acid hydrazide (ADH) molecular.The structure and morphology of samples were characterized by fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM),respectively.Moreover,their absorptive removal for alizarin red S from aqueous solutions was systematically investigated.Specifically,the effect of modifier concentration,initial dye concentration,adsorbent additive quantity,pH,temperature and contact time on the removal of alizarin red S were evaluated.The results showed that the optimal pH value about 2,the temperature of 50℃ were helpful for the adsorption of alizarin red S onto ADH@SBP.The adsorption followed pseudo-second-order kinetics,and the adsorption isotherm can be fitted better by langmuir equation than freundlich equation.Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic.
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基金资助
中国博士后特别资助项目(201104615);中央高校基本科研业务费专项资金(310829162014和310829161015)
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