响应曲面优化柏木屑微波活性炭的制备及其吸附AR88性能

发布时间：2018-11-04 18:08

【摘要】：以家具制造废弃物——柏木屑为原料,以磷酸为活化剂,采用微波加热方式,选用响应曲面分析法中心复合设计(CCD)对柏木屑活性炭(AC)制备因素进行优化,结果表明,活性炭最佳制备条件为磷酸/柏木屑质量浸渍比1.94∶1,辐照时间8.84 min,微波功率474.98 W,所得活性炭的碘吸附值为945.41 mg·g-1,得率为42.57%。将最优条件制备所得的柏木屑微波活性炭用于大分子染料酸性红88(AR88)的吸附特性研究,实验结果表明,AR88的去除率随着活性炭的投加量增加而升高,活性炭的吸附容量随着AR88浓度的升高而增加。活性炭对AR88的吸附符合Langmuir吸附等温模型,理论最大吸附量为322.58 mg·g-1。对柏木屑微波活性炭物化性质分析表明其表面存在大量无规则孔隙,比表面积、孔容和平均孔径分别为1 312 m2·g-1和0.896 cm3·g-1和2.88 nm。根据吸附结果和表征结果得知,柏木屑微波活性炭是一种具有潜力的高效吸附剂,能有效去除水中的AR88。
[Abstract]:The preparation factors of active carbon (AC) of cypress sawdust were optimized by means of microwave heating with phosphoric acid as activator and response surface analysis center (CCD) as the composite design, using the furniture waste, cypress sawdust as raw material and phosphoric acid as activator. The optimum preparation conditions of activated carbon were as follows: mass impregnation ratio of phosphoric acid / cypress sawdust was 1.94: 1, irradiation time was 8.84 min, microwave power 474.98 W, iodine adsorption value of activated carbon was 945.41 mg g ~ (-1), the yield was 42.57%. The microwave activated carbon of cypress sawdust prepared under the optimum conditions was used to study the adsorption characteristics of the macromolecular dye acid red 88 (AR88). The experimental results showed that the removal rate of AR88 increased with the increase of the amount of activated carbon. The adsorption capacity of activated carbon increased with the increase of AR88 concentration. The adsorption of AR88 on activated carbon is in accordance with the Langmuir adsorption isotherm model, and the theoretical maximum adsorption capacity is 322.58 mg g ~ (-1). The physicochemical properties of microwave activated carbon from cypress sawdust show that there are a lot of irregular pores on the surface. The specific surface area, pore volume and average pore size are 1 312 m2 g ~ (-1) and 0.896 cm3 g ~ (-1) and 2.88 nm., respectively. According to the results of adsorption and characterization, it is known that microwave activated carbon from cypress sawdust is a potential high efficiency adsorbent, which can effectively remove AR88. from water.
【作者单位】：四川大学建筑与环境学院;国家烟气脱硫工程技术研究中心;
【分类号】：TQ424.1;X788

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