Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media  

作　　者：Yueru Fang Amjad Ali Yuxi Gao Peng Zhao Ronghua Li Xianxian Li Junxi Liu Yuan Luo Yaru Peng Hailong Wang Hongbin Liu Zengqiang Zhang Junting Pan 

机构地区：[1]College of Natural Resources and Environment,Northwest A&F University,Yangling,Xianyang 712100,Shaanxi,China [2]School of Environmental and Municipal Engineering,Shaanxi Key Laboratory of Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [3]Biochar Engineering Technology Research Center of Guangdong Province,School of Environmental and Chemical Engineering,Foshan University,Foshan 528000,Guangdong,China [4]Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China

出　　处：《Biochar》2022年第1期518-532,共15页生物炭（英文）

基　　金：The National Natural Science Foundation of China(31902122,32172679);the National College Students Innovation and Entrepreneurship Training Programs of China(2020).

摘　　要：Conversion of organic waste into engineered metal-biochar composite is an effective way of enhancing biochar’s efficiency for adsorptive capture of phosphorus(P)from aqueous media.Thus,various strategies have been created for the production of metal-biochar composites;however,the complex preparation steps,high-cost metal salt reagent application,or extreme process equipment requirements involved in those strategies limited the large-scale production of metal-biochar composites.In this study,a novel biochar composite rich in magnesium oxides(MFBC)was directly produced through co-pyrolysis of magnesite with food waste;the product,MFBC was used to adsorptively capture P from solution and bio-liquid wastewater.The results showed that compared to the pristine food waste biochar,MFBC was a uniformly hybrid MgO biochar composite with a P capture capacity of 523.91 mg/g.The capture of P by MFBC was fitted using the Langmuir and pseudo-first-order kinetic models.The P adsorptive capture was controlled by MgHPO4 formation and electrostatic attraction,which was affected by the coexisting F−and CO_(3)^(2−)ions.MFBC could recover more than 98%of P from the solution and bio-liquid wastewater.Although the P-adsorbed MFBC showed very limited reusability but it can be substituted for phosphate fertiliser in agricultural practices.This study provided an innovative technology for preparing MgO-biochar composite against P recovery from aqueous media,and also highlighted high-value-added approaches for resource utilization of bio-liquid wastewater and food waste.

关 键 词：BIOCHAR Bio-liquid wastewater FERTILISER MAGNESITE Phosphorus recovery 

分 类 号：TB34[一般工业技术—材料科学与工程]