巯基改性煤矸石去除废水中镉离子的研究
Study on cadmium ions removal from wastewater by sulfydryl modified coal gangue
许洪飞 1陈明华 2周建民 3税永红2
作者信息
- 1. 成都纺织高等专科学校 固体废物生态低碳资源化重点实验室,成都 611756;四川轻化工大学材料科学与工程学院,四川自贡 643002
- 2. 成都纺织高等专科学校 固体废物生态低碳资源化重点实验室,成都 611756
- 3. 成都纺织高等专科学校 固体废物生态低碳资源化重点实验室,成都 611756;西南交通大学地球科学与环境工程学院,成都 611756
- 折叠
摘要
利用巯基改性热活化煤矸石制备巯基改性煤矸石,采用SEM、XRD、FT-IR、Zeta potential分析方法分析了巯基改性煤矸石的结构和表面官能团等特性,考察了废水pH值、共存离子、巯基改性煤矸石投加量对其吸附Cd2+的影响,探讨了其吸附动力学和吸附等温线.结果表明,巯基改性煤矸石具有丰富的孔道和片状结构,在废水pH值为9.0时对Cd2+的吸附效果最好;Na+、K+、Mg2+与Cd2+存在吸附竞争,抑制了对Cd2+的去除,F-、CO32-与Cd2+形成化合物,促进Cd2+的去除;巯基改性煤矸石对Cd2+的吸附更符合伪二级动力学和Freundlich吸附等温式,其对Cd2+的吸附以化学吸附为主,呈现多分子层吸附.在巯基改性煤矸石投加量为5 g/L,pH值为9.0,温度为50℃的条件下对Cd2+的吸附率为98.33％,吸附量为65.32 mg/g,巯基改性煤矸石对镉离子具有良好的吸附性能.
Abstract
Using sulfydryl modified thermal activation to prepare sulfydryl modified coal gangue,the struc-ture and surface functional groups of the sulfydryl modified coal gangue were analyzed by SEM,XRD,FT-IR,Zeta potential methods;besides,the effect of wastewater pH value,coexisting ions and sulfydryl modified coal gangue dosage on adsorption of Cd2+was investigated,and the adsorption kinetics and adsorption isotherms were discussed.The results showed that,sulfydryl modified coal gangue has rich pore channels and sheet-like struc-ture,the best adsorption effect on Cd2+was obtained when the wastewater pH value was 9.0.Na+,K+,Mg2+com-pete with Cd2+for adsorption,inhibiting the removal of Cd2+.A compound was formed with F-,CO32-and Cd2+,which promoting the removal of Cd2+.The adsorption of Cd2+by sulfydryl modified coal gangue fits pseudo second order kinetics and Freundlich adsorption isotherm,which is mainly chemical adsoption exhibiting multi-layered adsorption.Under the condition that the sulfydryl modified coal gangue dosage was 5 g/L,the pH value we 9.0,the temperature was 50 ℃,the adsorption rate of Cd2+was 98.33％,the adsorption capacity was 65.32 mg/L,it was indicated that sulfydryl modified coal gangue had good adsorption performance on cadmium ions.
关键词
巯基/改性/煤矸石/吸附/Cd2+/吸附动力学/等温线Key words
sulfydryl/modification/coal gangue/adsorption/Cd2+/adsorption kinetics/isotherm引用本文复制引用
基金项目
四川省科技计划(2021YFG0262)
成都纺织高等专科学校人才资助项目(RCXM22003)
成都纺织高等专科学校重点研发项目(2022fzlkb05)
出版年
2024
NETL
NSTL
万方数据