摘要
虽然锰掺杂生物炭对水中污染物具有优良的吸附性能,但是锰掺杂生物炭吸附剂物理化学特性与其对污染物的吸附性能之间的相关性仍不清楚。基于此,本研究以MnCl_(2)、玉米秸秆为原料,通过化学浸渍的方法,在300、500和800℃下制备锰掺杂生物炭(分别记为BC_(Mn)-300、BC_(Mn)-500、BC_(Mn)-800),探究不同吸附材料结构和性质差异及其对环丙沙星(CIP)的吸附作用机制。通过电镜扫描、比表面积分析仪、傅里叶变换红外光谱分析仪、拉曼光谱仪和X射线光电子能谱仪等对锰掺杂生物炭进行结构表征分析,发现当煅烧温度从300℃升至800℃时,O/C值从0.66降至0.17,(O+N)/C值从0.7降至0.19,而拉曼光谱中D峰和G峰比值从0.527升至1.010。吸附实验结果发现,锰掺杂生物炭对CIP的吸附性能均高于未掺杂锰生物炭,且随着煅烧温度的升高,CIP的吸附性能逐渐增强。锰掺杂生物炭对CIP的吸附机制主要包括氢键作用、孔填充、疏水作用以及π-π相互作用。构效分析发现,比表面积、总孔体积、ID/IG、C-C、C=O和MnO_(2)的含量均与吸附性能呈正相关,-OH与吸附性能无明显相关性,平均孔径、O/C、(O+N)/C、C-O和MnO的含量均与吸附性能呈负相关。研究显示,锰掺杂生物炭煅烧温度的提高,使其比表面积和孔体积增大,疏水性增强,极性减弱,具有更多的缺陷结构,锰掺杂生物炭的吸附性能取决于不同理化性质的协同作用。该研究结果可为强化CIP去除的定向结构调控、定制化生物炭材料制备提供理论基础。
Although Mn-doped biochar has excellent adsorption properties for water pollutants,the relationship between the physicochemical properties of Mn-doped biochar adsorbents and their adsorption properties for pollutants remains unclear.To address this,this study used MnCl_(2) and corn straw as raw materials to prepare Mn-doped biochar(BC_(Mn)-300,BC_(Mn)-500 and BC_(Mn)-800,respectively)at 300,500 and 800℃using a chemical impregnation method.The difference of structure and properties of different adsorbent materials and the adsorption mechanism of ciprofloxacin(CIP)were investigated.The structure of Mn-doped biochar was characterized using electron microscope scanning,specific surface area analyzer,Fourier transform infrared spectroscopy,Raman spectrometer and X-ray photoelectron spectrometer.Results indicated that when calcination temperature increased from 300℃to 800℃,the O/C value decreased from 0.66 to 0.17,and(O+N)/C value decreased from 0.7 to 0.19.The ratio of D-peak to G-peak in Raman spectrum increased from 0.527 to 1.010.The adsorption results showed that the CIP adsorption performance of Mn-doped biochar was better than undoped Mn-biochar,and CIP adsorption performance gradually improved with the increase of calcination temperature.The adsorption mechanism of CIP on Mn-doped biochar mainly includes hydrogen bonding,pore filling,hydrophobic effect andπ-πinteractions.Structure activity analysis showed that specific surface area,total pore volume,ID/IG,C-C,C=O and MnO_(2) contents were positively correlated with adsorption properties,while-OH contents were not significantly correlated with adsorption properties.Average pore size,O/C,(O+N)/C,C-O and MnO contents were negatively correlated with adsorption properties.These results show that the specific surface area and pore volume of Mn-doped biochar increase with the increase of calcination temperature,enhancing hydrophobicity and reducing polarity.The adsorption properties of Mn-doped biochar are dependent on the synergistic effect of various physica
作者
康佳玉
邓圣
韩旭
吴叔璇
白宇洋
姜永海
杨昱
KANG Jiayu;DENG Sheng;HAN Xu;WU Shuxuan;BAI Yuyang;JIANG Yonghai;YANG Yu(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《环境科学研究》
CAS
CSCD
北大核心
2024年第11期2526-2536,共11页
Research of Environmental Sciences
基金
长江生态环境保护修复联合研究(第二期)(No.2022-LHYJ-02-0404-006)。
