摘要
以竹粉废料为原料,利用尿素热解制得氮掺杂生物炭(NBC),再通过原位沉积法在生物炭表面生长纳米Fe_(3)O_(4),得到Fe_(3)O_(4)-氮掺杂生物炭复合材料(NBC-Fe_(3)O_(4))。以KH_(2)PO_(4)溶液模拟含磷废水测试了NBC-Fe_(3)O_(4)复合材料的吸附性能,结果表明复合材料在pH值7时达到最佳吸附效果,吸附效率接近100%,最大吸附量为20.3 mg/g;复合材料对磷的吸附符合朗格缪尔模型和二级动力学方程。另外,复合材料中含有大量的Fe(Ⅱ)和Fe(Ⅲ),可以通过外加H_(2)O_(2)溶液形成芬顿氧化体系,实现同步催化降解腐殖酸和吸附磷酸根污染物。
In order to improve the adsorption capacity of biochar,a N-doped biochar was designed.It was produced in the pyrolysis process by adding carbamide into bamboo powder.Then,the complex composed of NBC-Fe_(3)O_(4) was obtained by loading Fe_(3)O_(4) on the surface of biochar by in situ deposition.SEM and XPS were used to characterize the surface of NBC-Fe_(3)O_(4).The adsorption capacity of NBC-Fe_(3)O_(4) was tested by using an aqueous solution containing KH_(2)PO_(4) as a model pollute.The results showed that the highest removal efficiency could be nearly 100%when pH is at 7.The maximum adsorption capacity in theory is 20.3 mg/g.The adsorption isotherms fit Langmuir equation model and pseudo-second-order kinetic model perfectly.Moreover,the Fe(Ⅱ)and Fe(Ⅲ)in the complex can further form Fenton oxidation process in the existence of H_(2)O_(2).It makes NBC-Fe_(3)O_(4) oxidize humic acid and adsorb PO^(3-)_(4) at the same time.The obtained Fe_(3)O_(4)-N-doped biochar can be a novel adsorbent for removal of the phosphate in high organism concentration solution.
作者
于业帆
徐玲
倪忠斌
施冬健
陈明清
YU Yefan;XU Ling;NI Zhongbing;SHI Dongjian;CHEN Mingqing(Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemicaland Material Engineering,Jiangnan University,Wuxi 214122,China;Fuyang Branch,Hangzhou Municipal Ecology and Environment Bureau,Hangzhou 311400,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第6期6145-6150,共6页
Journal of Functional Materials
关键词
生物炭
纳米Fe_(3)O_(4)
磷吸附
芬顿氧化
N-doped biochar
Fe_(3)O_(4)nanoparticlesphosphate adsorption
Fenton oxidation process
