Bimetallic oxides composites have received an increasing attention as promising adsorbents for aqueous phosphate(P)removal in recent years.In this study,a novel magnetic compos-ite MZLCO was prepared by hybridizing amorphous Zr-La(carbonate)oxides(ZLCO)with nano-Fe3O4 through a one-pot solvothermal method for efficient phosphate adsorption.Our optimum sample of MZLCO-45 exhibited a high Langmuir maximum adsorption capacity of 96.16 mg P/g and performed well even at low phosphate concentration.The phosphate ad-sorption kinetics by MZLCO-45 fitted well with the pseudo-second-order model,and the adsorption capacity could reach 79％of the ultimate value within the first 60 min.The phosphate adsorption process was highly pH-dependent,and MZLCO-45 performed well over a wide pH range of 2.0-8.0.Moreover,MZLCO-45 showed a strong selectivity to phos-phate in the presence of competing ions(Cl-,NO3-,SO42-,HCO3-,Ca2+,and Mg2+)and a good reusability using the eluent of NaOH/NaCl mixture,then 64％adsorption capacity re-mained after ten recycles.The initial 2.0 mg P/L in municipal wastewater and surface water could be efficiently reduced to below 0.1mg P/L by 0.07 g/L MZLCO-45,and the phosphate re-moval efficiencies were 95.7％and 96.21％,respectively.Phosphate adsorption mechanisms by MZLCO-45 could be attributed to electrostatic attraction and the inner-sphere complex-ation via ligand exchange forming Zr/La-O-P,-OH and CO32-groups on MZLCO-45 surface played important roles in the ligand exchange process.The existence of oxygen vacancies could accelerate the phosphate absorption rate of the MZLCO-45 composites.

Chenyang Liu;Yili Wang;Xiaolin Li;Junyi Li;Shuoxun Dong;Haotian Hao;Yao Tong;Yanqing Zhou

College of Environmental Science and Engineering,Beijing Key Lab for Source Control Technology of Water Pollution,Beijing Forestry University,Beijing 100083,China;Center for Water and Ecology,State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

环境科学学报（英文版）

[1]Chenyang Liu;Yili Wang;Xiaolin Li;Junyi Li;Shuoxun Dong;Haotian Hao;Yao Tong;Yanqing Zhou-.Highly efficient P uptake by Fe3O4 loaded amorphous Zr-La(carbonate)oxides:Electrostatic attraction,inner-sphere complexation and oxygen vacancies acceleration effect)[J].环境科学学报（英文版）,2022(10):18-29

MZLCO,ZLCO,eluent

Highly,uptake,by,Fe3O4,loaded,amorphous,Zr,carbonate,oxides,Electrostatic,attraction,inner,sphere,complexation,oxygen,vacancies,acceleration,effect,Bimetallic,composites,have,received,increasing,attention,promising,adsorbents,aqueous,phosphate,removal,recent,years,In,this,study,novel,magnetic,prepared,hybridizing,nano,through,one,pot,solvothermal,method,adsorption,Our,optimum,sample,exhibited,Langmuir,maximum,capacity,performed,well,even,concentration,kinetics,fitted,pseudo,second,order,model,could,reach,ultimate,value,within,first,process,highly,dependent,wide,range,Moreover,showed,strong,selectivity,presence,competing,ions,NO3,SO42,HCO3,Ca2+,Mg2+,good,reusability,using,NaOH,NaCl,mixture,then,mained,after,recycles,initial,municipal,wastewater,surface,efficiently,reduced,below,1mg,efficiencies,were,respectively,Phosphate,mechanisms,attributed,electrostatic,via,ligand,exchange,forming,CO32,groups,played,important,roles,existence,accelerate,absorption

0.518638