氯化锌活化法制备长柄扁桃壳活性炭

Preparation of activated carbon from amygdalus shell with zinc chloride

目的深入研究长柄扁桃壳的利用价值。方法探讨氯化锌活化法制备活性炭的最佳工艺条件,对产品性能进行表征,并初步研究其对印染废水的脱色能力。结果最佳工艺条件为氯化锌溶液质量分数为50%,活化温度为600℃,活化时间为90 min。此条件下活性炭得率为44.76%,碘吸附值为883.78 mg/g,亚甲基蓝吸附值为165 mg/g。活性炭77 K氮气吸附等温线属(Ⅱ)型吸附等温线,比表面积为1633.08 m2/g,累计孔容积为2.53 mL/g,平均孔径为9.68 nm。微量元素含量大小依次为Zn>Na>Mg>K>Ca>P,未检出Mn,Cd,As,Pb等有害元素。产品对自制印染废水的脱色率达到99.57%。结论长柄扁桃壳是制备优质活性炭的理想原料。

Aim To study the value of amygdalus shell in-depth.Methods The optimum conditions,the analysis of the products and their decoloring capacity for dyeing wastewater were investigated.Results The optimum conditions were： ZnCl2 solution concentration 50 %,activation temperature 600 ℃,activation time 90 min.Under the above optimum conditions,the yield,iodine value and methylene blue value were 44.76 %,883.78 mg/g and 165 mg/g respectively.N2 adsorption isotherms at 77 K belong to typed-II adsorption isotherms.The specific surface area,the accumulated pore volume and the averaged pore size were 1633.8 m2/g,2.53 mL/g and 9.68 nm respectively.There were six elements in the activated carbon whose content was ZnNaMgKCaP,and that the harmful elements-Mn,Cd,As,Pb were not discovered.The decolorizing rate of the products for self-mading dyeing wastewater was up to 99.57 %.Conclusion The products were regarded as ideal absorbents.