木质素活性炭的制备及工艺优化
Preparation of activated carbons from lignin by NaOH activation and processing optimization
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摘要: 以造纸黑液木质素为原料，NaOH为活化剂，通过化学活化制备活性炭(AC)。考察了活化温度、活化时间和浸渍比对AC比表面积的影响。采用中心组合设计(Central composite design，CCD)，运用响应面法(Response surface methodology，RSM)进行工艺参数优化。得出最佳工艺参数：活化温度为751℃，活化时间为57min，浸渍比为2.06, 可制得AC比表面积为1 437.22m2/g。并对模型进行了检验，验证了数学模型的有效性。Abstract: Activated carbons（ACs）were prepared from lignin by NaOH activation. The influence of NaOH/lignin ratio, activation temperature and time on Brunauer-Emmett-Teller (BET) surface areas of ACs was investigated. Based on experimental optimization methods including the central composite design and response surface methodology, optimized parameters were found and the maximum BET surface area of ACs was 1437.20m2/g when lignin was activated at 751℃ for 57min with a NaOH/lignin ratio of 2.06.
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