Studies on adsorption of nitrate from modified hydrophyte biochars
WANG Bo1, YE Chun2, LI Fa-yun1, QU Qian1, CHEN Xin1
1. Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun 113001, China;
2. Centre of Lake Engineering & Technology, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
To develop an efficient and economic technology to remove nitrate from constructed wetland in high-latitude areas under the conditions of autumn temperature, modified hydrophyte biochars were prepared with aquatic plant litters collected from constructed wetlands. Laboratory experiments were conducted to investigate the removal of nitrate from aqueous solution and wastewater by modified hydrophyte biochars. The experimental results showed that the modified biochars (MRB and MCB) carried positive charge and that Zeta potentials were respectively +5.46mV and +2.31mV. The second order model fit the nitrate sorption kinetics of modified hydrophyte biochars with a high coefficient of determination (R2>0.99). Freundlich isotherms performed well to fit the nitrate sorption data (R2>0.98) of modified hydrophyte biochars when compared to Langmuir isotherms. The maximum adsorption capacity of MRB and MCB to nitrate was 14.6661mg/g and 5.5559mg/g, respectively. Batch adsorption experiments also showed that both initial solution pH and coexisting anions could affect the adsorption of nitrate onto modified hydrophyte biochars. Modified hydrophyte biochars could efficiently remove nitrate from wastewater in constructed wetland.
王博, 叶春, 李法云, 曲乾, 陈鑫. 水生植物制生物炭对硝态氮的吸附规律研究[J]. 中国环境科学, 2017, 37(1): 116-122.
WANG Bo, YE Chun, LI Fa-yun, QU Qian, CHEN Xin. Studies on adsorption of nitrate from modified hydrophyte biochars. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(1): 116-122.
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