摘要
以典型偶氮染料甲基红为吸附对象,将壳聚糖和生物炭混合制成微球制剂,对该制剂吸附甲基红的潜力、机制及添加微生物后微球菌剂的吸附增益效应进行研究.结果表明,所制得的壳聚糖-生物炭微球具有良好的吸附特性,在染料初始质量浓度为500 mg/L、p H 3.0和20℃条件下,微球对甲基红的最大吸附量为460 mg/g.Freundlich等温方程和准二级动力学方程模型与该吸附过程拟合良好.利用Elovich方程与颗粒内扩散方程对微球的吸附过程进行研究,结果证实该吸附过程为自发过程,内部扩散为该过程的限速步骤.通过热力学方程计算得到吸附过程的热力学参数ΔG0、ΔH0和ΔS0分别为-24.35 k J/mol(30℃)、-21.36 k J/mol和8.45 J/(mol K).表明此吸附过程为放热过程,较高温度可降低微球吸附的自发性并抑制微球对甲基红的吸附作用.利用神经网络对影响吸附过程的4个因素(p H值,温度,初始浓度,吸附时间)进行建模分析,发现温度对吸附过程的影响最大,相对重要性为32.76%,时间次之(为25.56%),其余依次为p H(23.36%)和初始浓度(18.32%).包埋微生物的微球菌剂与无微生物的纯壳聚糖-生物炭微球相比,脱色率提高了29%;与微生物单独脱色相比,脱色率提高了76%,表明生物吸附材料与微生物混合制备成菌剂的吸附增益效果明显.
Summary Dyes are widely and intensively used in leather , textile , paper , printing , cosmetic , plastic , food and pharmaceutical industries . Most of them pose serious threats to the environment because of their carcinogenic potential and cytotoxicity . Hence , effluents containing dye molecule must be treated to minimize the threat to the ecosystem . Adsorption has been found to be one of the prominent techniques for dye wastewater treatment considering cost and efficiency . While the main disadvantage of physical adsorption is its simple transfer of the dye molecules to another phase rather than complete destruction . Therefore , it is meaningful to find an efficient adsorbent and explore the synergistic effect of the prepared adsorbent by combining adsorption material with dye‐biodegrading microorganisms . Methyl red was selected as model azo dyes in this study to investigate the biosorption behavior of newly produced chitosan‐biochar microsphere , and meanwhile the enhancing effect of microsphere‐microbe complex on removal of the dye was evaluted .
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2015年第2期228-236,共9页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家高技术研究发展计划(863计划)项目(2012AA06A203)
关键词
甲基红
壳聚糖
生物炭微球
吸附机制
菌剂
增益效应
methyl red
chitosan-biochar microsphere
adsorption mechanism
microbial agent
enhancing effect
