摘要
本研究利用稻壳制备高介孔率生物炭,然后用共沉淀法负载金属La、Al,制得镧铝改性稻壳基生物炭吸附剂.通过控制反应时间、磷浓度、共存阴离子、初始pH等条件,研究共存钙离子时对吸附剂除磷性能的影响.结果表明,La、Al在稻壳基生物炭上负载后呈无定型态;吸附剂的除磷过程符合伪二阶动力学模型和Langmuir模型,且Ca2+的加入有利于提高磷的去除率,含Ca2+体系的最终除磷效果是无Ca2+时的2.6倍;含竞争阴离子时,Ca2+的加入会使F-对磷吸附的抑制作用减弱,使HCO3-对磷吸附的抑制作用略微增强;在pH值为2.0—8.0时,Ca2+能提高改性生物炭的吸附容量,而pH>8.0时主要是钙离子与磷酸盐的沉淀作用使体系中磷大量被去除.
In the present work,the modified adsorbents were obtained by co-precipitation La and Al to the high mesoporous biochar which was prepared from rice husks.The effects of reaction time,phosphate concentration,coexisting anions,initial pH and other conditions on the phosphate removal properties of the adsorbents were characterized with the existence of calcium ions.The results showed that La,Al was amorphous on rice husk biochar,the phosphate removal process was in accordance with the pseudo second-order kinetic model and Langmuir model,and the addition of calcium ions improved the phosphate removal rate,the phosphorus removal performance of Ca2+system was 2.6 times higher that of Ca2+free.In the presence of competitive anions,the addition of calcium ions would weaken the inhibition of F-on phosphate adsorption,and slightly enhance the inhibition of HCO-3.At pH 2.0—8.0,Ca2+could increase the adsorption capacity of the modified biochar,while the higher phosphate removal was achieved by the precipitation of calcium ions and phosphate when pH>8.0.
作者
阮华珍
高章龙
陈玉婷
魏小婷
熊瑞涵
石稳民
刘冬啟
康建雄
李道圣
任拥政
RUAN Huazhen;GAO Zhanglong;CHEN Yuting;WEI Xiaoting;XIONG Ruihan;SHI Wenmin;LIU Dongqi;KANG Jianxiong;LI Daosheng;REN Yongzheng(School of Environmental Science&Engineering,Huazhong University Science and Technology,Wuhan,430074,China;China Urban Construction Design&Research Institute Co.Ltd,Beijing,100120,China;Central and Southern China Municipal Engineering Design&Research Institute Co.,Ltd,Wuhan,430000,China;China Construction Third Bureau Green Industry Investment Co.,Ltd.,Wuhan,430056,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第5期1279-1289,共11页
Environmental Chemistry
基金
国家自然科学基金(51409108)
国家重点研发计划(2018YFD1100600)资助
关键词
稻壳基生物炭
改性
共存钙离子
除磷
rice husk biochar
modification
coexistence of calcium ions
phosphate removal
