摘要
采用一步水热法将片状Co W-LDH锚定在凹凸棒石(ATP)表面,制备了具有微纳米花簇片状结构的Co W-LDH/ATP复合材料,采用扫描电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等表征其微观形貌与物相组成,并对实验室条件下模拟含铅废水中Pb^(2+)的吸附性能与机理进行了系统研究。废水中Pb^(2+)吸附处理实验结果表明,Pb^(2+)初始浓度为5.0mg/L、pH=6条件下,经20min吸附处理,Pb^(2+)去除效率达约99%;Co W-LDH/ATP复合材料对Pb^(2+)表现出显著的吸附选择性,分配系数Kd为938.51L/g,且水体共存阴离子对Pb^(2+)吸附干扰小。Co W-LDH/ATP复合材料Pb^(2+)饱和吸附容量为872.07mg/g,显著高于文献报道的凹凸棒石基材料。除此之外,经8次吸附-解吸后,Pb^(2+)去除效率仍保持在94%以上,表明Co W-LDH/ATP复合材料具有较好的循环稳定性。Pb^(2+)吸附机理研究表明,Co W-LDH/ATP复合材料对Pb^(2+)的去除主要通过含氧基团与Pb^(2+)之间的金属-氧键络合作用和配位截留作用。本研究制备的Co W-LDH/ATP复合材料,具有吸附速率快、选择性好、吸附容量高的优势,研究结果可为废水Pb^(2+)污染规模化治理提供理论依据和技术支撑。
CoW-LDH/ATP composites with notable micro-and nanocluster sheet structures were created by employing a one-step hydrothermal process to fix the sheet CoW-LDH on the attapulgite(ATP)rod-shape structure.The microscopic morphology and the physical phases composition were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).A systematic study was conducted to explore the adsorption properties and the mechanism of Pb^(2+)adsorption in lead-containing wastewater under laboratory conditions.The experimental results of Pb^(2+)adsorption treatment in wastewater showed that at the initial Pb^(2+)concentration of 5.0mg/L and solution pH of 6,the Pb^(2+)removal efficiency reached approximately 99%after 20min adsorption.The Pb^(2+)adsorption selectivity of CoW-LDH/ATP composites was significant,with a partition coefficient Kd value of 938.51L/g,and nearly no interference from coexisting anions.CoW-LDH/ATP composite had a saturation adsorption capacity for Pb^(2+)of 872.07mg/g,which was significantly greater than the concave clay-based materials that had been described in the literature.Furthermore,following eight cycles of adsorption-desorption,the Pb^(2+)removal efficiency held steady at over 94%,suggesting the CoW-LDH/ATP composites had strong cyclic stability.The study on the adsorption mechanism of Pb^(2+)showed that the removal of Pb^(2+)by CoW-LDH/ATP composites was predominantly through the metal-oxygen bonding complexation and ligand retention between oxygen containing groups and Pb^(2+).The prepared CoW-LDH/ATP composites had the advantages of quick adsorption rate,high adsorption capacity and strong selectivity.The results of this work might offer a theoretical foundation and technical assistance for the extensive treatment of Pb^(2+)contamination wastewater.
作者
张炜
黄赳
朱晓芳
李鹏
ZHANG Wei;HUANG Jiu;ZHU Xiaofang;LI Peng(School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,Jiangsu,China)
出处
《化工进展》
北大核心
2025年第1期596-606,共11页
Chemical Industry and Engineering Progress
基金
国家重点研发计划(2022YFF1303305)
江苏省自然科学基金(BK20210519)
中央高校基本科研业务费专项(2023ZDPY02)。
关键词
钴钨水滑石
凹凸棒石
铅离子
吸附剂
吸附机理
cobalt-tungsten hydrotalcite
attapulgite
Pb2+
adsorbents
adsorption mechanism
