摘要
橄榄油生产工业产生了大量的固体废弃物——橄榄果渣(OP),该研究利用OP作为再生前驱体,采用氢氧化钾作为活化剂处理OP,将其制成一种成本低且环保的生物吸附剂(OP-AC),用于去除水溶液中的亚甲基蓝(MB).通过单因素和响应面考察了改变制备过程中的固液比、活化时间、活化温度对MB吸附量和去除率的影响,通过红外光谱、扫描电镜、X射线、孔径分析仪和X射线衍射对所制备的OP-AC进行了表征.结果表明,当固液比为4∶5.8、活化时间为21 min、活化温度为527℃时,染料MB去除率最大为92.6％.通过对制备的OP-AC进行表征,其比表面积为278.832 4 m2/g,平均孔径为3.418 0 nm,总孔容为0.131 684 cm3/g,微孔占比为79.42％.OP-AC表面含有丰富的官能团,以含氧官能团为主,包括羟基、羧基和羰基等.结果表明制备的吸附剂孔隙结构发达,表面吸附位点充裕,是一种高效、环保、低成本的生物材料,可用于去除水体中的MB.
Abstract
Olive pomace(OP),a kind of solid waste,is generated in a large amount from olive-oil production industry,which can be used as the precursor of regeneration to produce a sort of cost-effective and environment-friendly biological adsorbent(OP-AC)by means of treating OP with potassium hydroxide as an activator.In this experimental study,OP-AC prepared in the laboratory and characterized by FT-IR,SEM,XPS,BET and XRD was applied to removing methylene blue(MB)from aqueous solution(printing/dyeing wastewater),and the effect of solid/iquid ratio,activation time and activation temperature on the adsorption capacity and MB removal rate were investigated by a single factor and response surface method(Box-Behnken).Consequently,it was showed that OP-AC being prepared as the solid-liquid ratio was 4∶5.8,the activation time 21 min and the activation temperature 527 ℃,and under this condition,MB removal rate could be up to 92.6％in max-imum;and the characterization of OP-AC showed that the specific surface area of the prepared OP-AC was 278.832 4 m/g,the average pore size 3.418 0 nm,and the total pore volume 0.131 684 cm/g,with the proportion of micropores being 79.42％,and the surface of OP-AC was ample in functional groups:mainly oxygen-containing functional groups,including hydroxyl groups,carboxyl groups and carbonyl groups.In conclusion,the result of this experimental study suggested that OP-AC,the prepared adsorbent,possessed a developed pore structure with abundant adsorption sites on the surface,being an efficient,en-vironmentally friendly and cost/effective bio-material and could be used to remove MB from the wastewater.
基金项目
甘肃省青年科技基金计划(21JR7RA348)
甘肃省重点研发项目(17YF1NK088)
西北师范大学青年教师科研能力提升计划(NWNU-LKQN2020-05)
维普
万方数据