摘要
为进一步利用广西大量的农业有机废弃物资源,实现资源和环境效益的最大化,采用恒温振荡吸附方法,研究蔗渣炭和玉米秸秆炭对NH4Cl溶液中铵氮的等温吸附特征、吸附动力学过程,分析吸附时间、初始液浓度、添加量对生物质炭吸附铵氮效果的影响。结果表明,蔗渣炭和玉米秸秆炭对铵氮的吸附平衡时间均为3 h,平衡吸附率分别为39.0%和41.3%。生物质炭对铵氮的吸附率随添加量的增加而增加,但单位吸附量随添加量的增加而减少。对铵氮的吸附符合Langmuir方程和Freundlich方程,蔗渣炭和玉米秸秆炭对铵氮最大吸附量分别为2.50mg/g和2.88 mg/g。总体上,玉米秸秆炭对溶液中铵氮的吸附性能优于蔗渣炭。
In order to maximally utilize the abundant agriculture organic wastes（bagassein） and to maximize the efficiency of resources and environment in Guangxi Province, an oscillation adsorption experiment under constant temperature was conducted to study the characteristics of the ammonium nitrogen adsorbed by biochars： bagasse and maize straw. The effects of adsorption time, initial concentration of ammonium nitrogen, the amount of biochar added on the adsorption of ammonium nitrogen were analyzed. Results showed that the times of equilibrium adsorption for both biochar derived from bagasse and maize straw were 3 hours, and their equilibrium adsorption rates were 39.0% and 41.3% respectively. The adsorption rate was increased with the increasing rate of bagasse biochar added, but the adsorption amount per gram biochar was decreased. The adsorption processes conformed to Langmuir and Freundlich equations. The maximum adsorption capacities were 2.50 mg/g and 2.88 mg/g for biochars of bagasse and maize straw, respectively. Overall, the maize straw biochar had better capacity to adsorb ammonium nitrogen than bagasse biochar.
出处
《农业现代化研究》
CSCD
北大核心
2016年第2期381-386,共6页
Research of Agricultural Modernization
基金
国家科技支撑计划项目(2012BAD05B03-6)
中国科学院西部之光人才培养计划"西部博士资助项目"~~
关键词
蔗渣
玉米秸秆
生物质炭
铵氮
吸附
bagasse
maize straw
biochar
ammonium nitrogen
adsorption
