糯米灰浆粘结型富钙成型活性炭的制备及其性能

利用造纸白泥原位物理活化杉木屑制备富钙活性炭粉,考察了制备工艺条件对活性炭粉得率和吸附性能的影响。在富钙活性炭粉中加入糯米浆进行捏合并压制成型,制得糯米灰浆粘结型柱状成型活性炭。在白泥与杉木屑质量比3∶2,950℃活化1.5 h的优化条件下,可制备出比表面积为975 m~2/g、得率约24%的活性炭样品。经300℃热处理1 h后制得的糯米灰浆粘结型富钙成型活性炭,其抗压强度高达18 MPa,碘吸附值为410 mg/g,耐水浸泡性长达60 d以上。SEM和XRD分析结果显示:糯米灰浆粘结成型活性炭中各组分间胶结紧密,且糯米浆对成型活性炭试样中石灰组分的炭化结晶进程具有调控作用。

Preparation and Performance of Calcium-rich Activated Carbon Monolith Cemented by Sticky Rice-lime Mortar

Chinese fir sawdust was physically activated by papermaking white mud to prepare calcium-rich powdery activated carbons. The effects of preparation conditions on the yield and adsorption capacity of activated carbons were investigated. Compression molding of a mixture of calcium-rich activated carbons blended with cooked sticky rice soup was performed to fabricate sticky rice-lime mortar cemented column-shaped activated carbon monolith. Under the optimized conditions, the specific surface area of the prepared activated carbon was 975 m2/g and the yield was about 24%. After heat treatment at 300℃ for 1 h, the iodine adsorption value of the prepared activated carbon monolith was 410 mg/g, the compressive strength was 18 MPa, and its resistance to water immersion was excellent. SEM and XRD analysis results indicated that the components of the sticky rice-lime mortar bonding activated carbon monolith were cemented closely, and the carbonation crystallization process of the lime component which was integrated in activated carbon monolith could be regulated by the glutinous rice paste to form a compact microstructure.