活性焦孔径分布对COD吸附及脱色能力的影响

Influence of pore size distribution of lignite activated coke on COD adsorption and decolorization capacity

利用美国康塔孔径分析仪对自制的6种褐煤活性焦进行孔径分析,同时测试活性焦处理煤化工废水时吸附COD和脱色的有效孔径,分析了褐煤活性焦孔径分布与COD吸附能力和脱色能力的关系.结果表明：活性焦脱色能力与孔容积密切相关,要得到较好的脱色活性焦,其孔容积应达到lcm3/g以上.活性焦吸附COD的有效孔径主要集中在-5 nm,10～ 15 nm孔径对活性焦脱色能力贡献最大.5～10 nm孔径的COD吸附能力和脱色能力无规律可循;10～15 nm与15～20 nm孔径的COD吸附能力和脱色能力相近,这部分孔径的比例越大,吸附COD能力越差,而脱色能力则越强;＋20 nm孔径对COD吸附能力影响不明显,但脱色能力明显上升.

To determine the influence of the pore size distribution of lignite activated coke on COD adsorption and color removal properties,analyse the pore size of six kind of American homemade lignite activated coke by Contador pore size analyzer.Determine the effective aperture of activated coke for coal chemical industry wastewater treatment.Compare the pore size distribution of activated coke with the activated coke properties.The results show that,the discoloration ability of activated coke is closely related to the pore volume of the coke.To get high discoloration ability,the pore volume of activated coke should reach 1 cm3/g or more.The mainly adsorption COD effective aperture of active coke ranges from 0 nm to 5 nm.The activated coke,whose pore size is between 10 nm and 20 nm,has the best discoloration ability.The effect of the activated coke,whose pore size ranges from 5 nm to 10 nm,is irregular.The activated coke,whose pore size is above 20 nm,has little effect on the COD adsorption capacity,and only work on the discoloration.