羧基酯化改性花生壳对染料废水的吸附

通过甲醇酯化法制备改性花生壳,用于吸附刚果红、次甲基蓝染料废水.考察了吸附时间、溶液pH值、初始浓度对吸附的影响及改性花生壳的再生.结果表明,在室温、刚果红在pH值4.16、次甲基蓝在7.45时,吸附效果最佳,经搅拌吸附120 min达到平衡,两染料最大吸附率分别为82.30％和90.84％,饱和吸附量分别为10.88 mg/g和11.82 mg/g.吸附符合一级动力学过程和Langmuir等温吸附模型.改性花生壳吸附效果较未改性花生壳明显提高,且可经0.5 moL/L NaOH溶液再生重复使用.

Study on adsorption of dyeing wastewater by modified peanut shells

Adsorption of methylene blue and Congo dye in simulated dyeing wastewater by methyl alcohol modified peanut shells was studied respectively.The effects of adsorption time,pH value,dye concentration on the adsorption rate and peanut shells regeneration were investigated.Results indicated that the modified peanut shells are capable to adsorb both anion and cation dyes effectively.The adsorption rate reached to 82.30％ and 90.84％,while adsorption capacity 10.88 mg/g and 11.82 mg/g under room temperature,for a solution with pH 4.16 and 7.45,respectively.The adsorption behavior for dyes is fitted into the Langmuir isotherms and pseudo-first-order kinetics equation.The modified peanut shells adsorption effect significantly improved and it could be reused by 0.5 mol/L sodium hydrate solution.