ZnCl_(2)络合法分离黑液木质素高效制备高吸附性能活性炭  

Efficient Preparation of Activated Carbon with High Adsorption Capacity Using Lignin-Zn Complex from Black Liquor

作　　者：王璐璐 王冠华[1] 隋文杰 司传领[1] WANG Lulu;WANG Guanhua;SUI Wenjie;SI Chuanling(College of Light Industry Science and Engineering,Tianjin University of Science&Technology,Tianjin,300457;College of Food Science and Engineering,Tianjin University of Science&Technology,Tianjin,300457)

机构地区：[1]天津科技大学轻工科学与工程学院,天津300457 [2]天津科技大学食品科学与工程学院,天津300457

出　　处：《中国造纸学报》2023年第2期1-11,共11页Transactions of China Pulp and Paper

基　　金：国家自然科学基金(32071721);天津市青年英才资助计划(TJSQNTJ-2020-05);国家重点研发计划子项目“农产品产区土壤环境质量评价与分类标准研究”(2018YFF0213402);山东省重大科技创新项目(2018CXGC0220);湖南省重点领域研发计划(2019NK2032)。

摘　　要：采用ZnCl_(2)络合的方式从黑液中分离出木质素并获得木质素-锌络合物,将其作为前驱体,经碳化高效制备高吸附性能活性炭(CAC)。结果表明,经ZnCl_(2)络合(0.5 mol/L ZnCl_(2),0.6 mL/mL黑液)后,黑液中分离出89.5%的木质素,络合处理后黑液的COD_(Cr)值降低72.4%,pH值呈中性。同时,金属络合作用使得锌离子均匀分布在木质素-锌络合物中,有助于碳化过程中多孔结构的均匀分布。与传统酸析木质素浸渍工艺相比,木质素-锌络合物碳化法制备的活性炭具有更高的比表面积和吸附量。所制备的CAC活性炭对阳离子亚甲基蓝和阴离子甲基橙的最大平衡吸附量分别为1046.8和263.6 mg/g,优于大多数研究报道制备的吸附剂的吸附量。Lignin-Zn complex isolated from black liquor by ZnCl_(2) complexation was used as the carbon precursor to prepare activated carbon with high adsorption performance.The results showed that after ZnCl_(2) complexation(0.5 mol/L ZnCl_(2),0.6 mL/mL black liquor),89.5%of lignin in black liquor was isolated accompanied with COD_(Cr) reduction of 72.4% and neutral pH value for the treated black liquor.Meanwhile,the metal complexation rendered Zn^(2+)distributing evenly in the lignin-Zn complex,facilitating the well-proportioned formation of porous structure during carbonization process.The activated carbon prepared from lignin-Zn complex had higher specific surface area and adsorption capacity,compared with the conventional process of acid-precipitated lignin by impregnation.Moreover,maximum equilibrium adsorption capacities of the as-prepared activated carbon were 1046.8 mg/g and 263.6 mg/g for cationic methylene blue and anionic methyl orange,respectively,which were higher than those absorbents prepared in previous reports.

关 键 词：黑液 木质素-锌络合物 活性炭 染料吸附 

分 类 号：TS79[轻工技术与工程—制浆造纸工程]