摘要
磷是动植物必不可少的营养物质.然而,地表水中过量的磷会导致水生植物和藻类的快速生长.本研究通过氯化镁对玉米芯残渣进行改性,在无氧条件下高温烧制并与碱改性凹凸棒混合,制备了一种碱改性生物炭-凹凸棒土复合物(MgO-CB-AMAP).该碱改性生物炭具有高比表面积,达396.2 m^(2)/g,明显高于直接煅烧制备的生物碳(132.7 m^(2)/g).进一步,评价了MgO-CB-AMAP复合物对水中磷的吸附性能.结果表明:当水中磷浓度5 mg/L、玉米芯及凹凸棒的比例为1∶3、用量为2 g/L时,6 h后磷去除率达91%,吸附量为9.7 mg/g,均高于生物炭(3.6 mg/g)和碱改性凹凸棒(6.1 mg/g).最后,对MgO-CB-AMAP在模拟含磷污染水体中磷的吸附过程进行了动力学研究,该吸附过程符合准二级动力学模型.研究结果表明这种碱改性生物炭-凹凸棒土复合物在磷污染控制中有很好的应用前景.
Phosphorus is an essential nutrient for plants and animals.However,excessive phosphorus in the surface water can cause the explosive growth of aquatic plants and algae.In this study,a composite of MgO-modified biochar(MgO-CB)and alkali-modified attapulgite composite(AMAP)was prepared by modification of corncob residues by magnesium chloride,calcination at high temperature under anaerobic conditions,and then mixing with alkalimodified attapulgite.The as-prepared composite(MgO-CB-AMAP)has a specific surface area of 396.2 m2/g,which is significantly higher than that of CB(132.7 m2/g).Meanwhile,the adsorption performance of MgO-CB-AMAP to the phosphorus in water was evaluated.The results showed that the removal efficiency reached 91%and the adsorption capacity was 9.7 mg/g after 6 h,when the concentration of phosphorus was 5 mg/L,the ratio of corncob to attapulgite residues was 1∶3,and the dosage was 2 g/L.The adsorption capacity of MgO-CB-AMAP was higher than that of CB(3.6 mg/g)and alkali-modified attapulgite(6.1 mg/g).Finally,the adsorption kinetics of MgO-CB-AMAP in the simulated wastewater containing phosphorus was studied.The adsorption process was in accordance with the pseudo-second-order kinetic model.The results showed that MgO-CB-AMAP has a good potential for the removal of phosphorus from water.
作者
黄仁亮
龙禹璇
肖瑶
崔美
苏荣欣
Huang Renliang;Long Yuxuan;Xiao Yao;Cui Mei;Su Rongxin(School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China;School of Marine Science and Technology,Tianjin University,Tianjin 300072,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2022年第9期919-926,共8页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(21976132).
关键词
磷
生物炭
玉米芯
凹凸棒
吸附
phosphorus
biochar
corncob
attapulgite
adsorption
作者简介
黄仁亮(1985—),男,博士,副教授;通信作者:黄仁亮,tjuhrl@tju.edu.cn.
