不同铁基生物炭的制备及其对Sb(Ⅲ)吸附特性研究  

Study on preparation of different iron-based biochar and its adsorption property for Sb(Ⅲ)

作　　者：王琴 黄兆琴[2] 吉栋梁 张宇峰 WANG Qin;HUANG Zhaoqin;JI Dongliang;ZHANG Yufeng(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China;College of Environmental and Ecology,Jiangsu Open University,Nanjing 210017,Jiangsu,China)

机构地区：[1]南京工业大学环境科学与工程学院,江苏南京211816 [2]江苏开放大学环境生态学院,江苏南京210017

出　　处：《低碳化学与化工》2025年第4期80-89,共10页Low-Carbon Chemistry and Chemical Engineering

基　　金：江苏省科技厅产学研合作项目(BY20230861,BY20230942,BY20230850)。

摘　　要：锑(Sb)污染问题日益严重,探寻一种高效可行的含Sb废水治理方法至关重要。以互花米草和梧桐树皮为原材料,筛选得到优选生物炭(FSC300和FMC400),运用EA、N2吸/脱附、SEM、FT-IR和XRD等技术对不同生物炭的理化性质进行了表征,并对优选生物炭及相应热解温度制备所得初始生物炭的Sb(Ⅲ)吸附动力学和等温吸附特征进行了研究。结果表明,FSC300表面含氧量高且极性强,FMC400含碳量高且芳香性强。相较于初始生物炭,FSC300、FMC400比表面积分别增大了1.35倍、1.10倍,且FSC300和FMC400均成功负载了Fe3O4及FeOOH。当含锑废水pH值为5、生物炭投加量为2.5 g/L时,FSC300和FMC400的Sb(Ⅲ)吸附容量分别提高至20.81 mg/g和22.06 mg/g,相较初始生物炭分别提高了1.63倍和1.78倍。生物炭Sb(Ⅲ)吸附过程与Langmuir模型和准二级动力学模型相符,主要为单层化学吸附,其吸附机理包括物理吸附、表面络合和离子交换。The increasingly serious issue of antimony(Sb)pollution makes it crucial to search for an efficient and feasible method to treat Sb-containing wastewater.The Spartina alterniflora and Sycamore bark were used as raw materials to screen for the preferred biochar(FSC300 and FMC400),and EA,N2 adsorption/desorption,SEM,FT-IR and XRD techniques were used to characterize the surface physical and chemical properties of different biochar.The Sb(Ⅲ)adsorption kinetics and isothermal adsorption characteristics of preferred biochar and pristine biochar prepared at corresponding pyrolysis temperature were also studied.The results show that FSC300 has a high surface oxygen content and strong polarity,while FMC400 has a high carbon content and strong aromaticity.Compared to the pristine biochar,the specific surface areas of FSC300 and FMC400 increase by 1.35 and 1.10 times,respectively.FSC300 and FMC400 successfully load Fe3O4 and FeOOH.When the pH value of Sb-containing wastewater is 5 and the biochar dosage is 2.5 g/L,the Sb(III)adsorption capacities of FSC300 and FMC400 increase to 20.81 mg/g and 22.06 mg/g,which are 1.63 and 1.78 times higher than the initial biochar respectively.The adsorption process of Sb(Ⅲ)fits the Langmuir model and quasi-second-order kinetic model,mainly as monolayer chemical adsorption.The adsorption mechanisms include physical adsorption,surface complexation and ion exchange.

关 键 词：锑污染 铁基生物炭 Sb吸附 吸附机理 

分 类 号：TQ424.1[化学工程] X703[环境科学与工程—环境工程]