基于桉木预水解液的多形态碳微球的制备研究

Study on Preparation of Multiform Carbon Microspheres based on Eucalyptus Prehydrolysis Liquid

中文关键词:  预水解液  水热碳化  多形态碳微球  成形机理

Key Words:prehydrolysis liquid  hydrothermal carbonization  multiform carbon microsphere  forming mechanism

中文摘要:

      以桉木溶解浆生产过程中的副产物预水解液为原料，采用水热碳化工艺对预水解液进行处理，以制备碳微球。探讨了水热碳化过程中聚（4-苯乙烯磺酸-马来酸共聚物）钠盐（PSSMA）用量对碳微球形貌及得率的影响，并探究了不同结构碳微球的成形机理。结果表明，预水解液是制备碳微球的理想碳源，PSSMA可通过在碳微球表面提供静电斥力以调控碳微球形貌，使碳微球由交联的球簇结构转变为单分散微球结构和微球超结构。随着PSSMA用量增加和碳化时间的延长，碳微球及其超结构的粒径均呈先下降再趋于平缓的趋势；但PSSMA对碳微球得率的影响较小。

Abstract:

      Eucalyptus prehydrolysis liquor （PHL）， a by-product of the dissolved pulp production， was used as raw material to prepare hydrothermal carbon microspheres via hydrothermal carbonization. The influence of poly（4-styrenesulfonic acid-comaleic acid） sodium salt （PSSMA） dosage on the morphology and yield of carbon microspheres was discussed， and the formation mechanism of carbon microspheres with different structures was analyzed. The results showed that PHL was an ideal carbon source for the preparation of carbon microspheres. PSSMA can regulate the morphology of carbon microspheres by providing electrostatic repulsion on their surface， leading to the transformation of carbon microspheres from cross-linked sphere cluster structure to mono-dispersed spherical structure and microsphere superstructure. With increasing in PSSMA dosage and prolongation of carbonization time， the particle size of carbon microspheres and their superstructures decreased first and then leveled off. However， PSSMA has little effect on the yield of carbon microspheres.