双金属氧化物负载对污泥生物炭吸附重金属Cd(Ⅱ)和Pb(Ⅱ)的影响
Influence of bimetallic oxide loading on Cd(Ⅱ)and Pb(Ⅱ)adsorption capacity of sludge biochar
林伟雄 1周佳丽 2孙水裕3
作者信息
- 1. 肇庆学院环境与化学工程学院广东省环境健康与资源利用重点实验室,肇庆,526061
- 2. 广东工业大学环境科学与工程学院,广州,510006
- 3. 广东工业大学环境科学与工程学院,广州,510006;广东环境保护工程职业学院,佛山,528216
- 折叠
摘要
纯污泥生物炭由于其比表面积较低等导致其去除水中污染物的能力有限,需要对污泥生物炭进行改性强化其对污染物的去除.本文采用污泥生物炭负载层状双金属氧化物强化污泥生物炭吸附水中重金属.考察了金属组合,金属离子比例,负载金属浓度和焙烧温度对双金属氧化物(LDO)强化污泥生物炭(ASB)吸附水中重金属的影响,进而确定双金属氧化物-污泥生物炭复合材料(LDO-ASB)的制备方法.同时对制备的LDO-ASB进行表征并与ASB相比,探讨了双金属氧化物的负载对污泥生物炭的重金属吸附性能的影响机制.结果表明,Mg2+和Fe3+组合制备的LDO-ASB较其他金属组合具有更好的Cd(Ⅱ)和Pb(Ⅱ)的吸附能力.在Mg2+∶Fe3+物质的量比为3∶1,Mg2+的负载浓度为0.4mol·L-1,焙烧温度为500℃的条件下制备的(Mg/Fe)LDO-ASB对Cd(Ⅱ)和Pb(Ⅱ)的吸附量分别为149.72 mg·g-1和183.69 mg·g-1,较ASB的吸附能力有显著的提高.材料的表征结果显示,Mg和Fe以氧化镁和三氧化二铁的形态负载在污泥生物炭表面,负载后污泥生物炭表面粗糙,加大了细纹隧道,同时也增加了—OH官能团的含量,进而强化了污泥生物炭的重金属吸附能力.
Abstract
Due to the low specific surface area of pure sludge biochar,its ability to remove pollutants in water is limited,so it is necessary to modify sludge biochar to enhance its ability to remove pollutants.In this paper,sludge biochar was loaded with layered bimetallic oxides to enhance its adsorption of heavy metals in water.The effects of metal combination,metal ion ratio,metal concentration and roasting temperature on the adsorption of heavy metals by LDO enhanced ASB were investigated,and the preparation method of bimetallic oxide sludge biochar composite(LDO-ASB)was determined.Also,the influence of bimetallic oxide loading on the heavy metal adsorption performance of sludge biochar was discussed by comparing the characteristics of LDO-ASB and ASB.The results show that the LDO-ASB prepared by combination of Mg2+and Fe3+has better adsorption capacity of Cd(Ⅱ)and Pb(Ⅱ)than other metal combinations.The adsorption capacity of(Mg/Fe)LDO-ASB prepared under the conditions of 3∶1 ratio of Mg2+∶Fe3+,0.4 mol·L-1 loading concentration of Mg2+and 500 ℃ calcination temperature for Cd(Ⅱ)and Pb(Ⅱ)is 149.72 mg·g-1 and 183.69 mg·g-1 respectively,which is significantly higher than that of ASB.The characterization results showed that Mg and Fe were loaded on the surface of sludge biochar in the form of magnesium oxide and ferric trioxide.After loading,the surface of sludge biochar was rough,which increased the fine grain tunnel and the content of—OH functional group,thereby enhanced the heavy metal adsorption capacity of sludge biochar.
关键词
污泥生物炭/双金属氧化物/重金属/吸附Key words
sludge biochar/double oxides/heavy metals/adsorption引用本文复制引用
基金项目
肇庆市科技创新指导类项目(2021040302002)
广东省环境健康与资源利用重点实验室项目(2020B121201014)
肇庆学院科研项目(201914)
出版年
2024
NETL
NSTL
万方数据