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Highly Efficient and Selective Removal of Pb(II) ions by Sulfur-Containing Calcium Phosphate Nanoparticles
Cheng-yun Gong1,2, Zhi-gang Geng1, An-le Dong1, Xin-xin Ye1, Guo-zhong Wang1, Yun-xia Zhang1
1.Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;2.Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
Abstract:
A facile one-step co-precipitation method was demonstrated to fabricate amorphous sulfurcontaining calcium phosphate (SCP) nanoparticles, in which the sulfur group was in-situ introduced into calcium phosphate. The resulting SCP exhibited a noticeable enhanced performance for Pb(II) removal in comparison with hydroxyapatite (HAP), being capable of easily reducing 20 ppm of Pb(II) to below the acceptable standard for drinking water within less than 10 min. Remarkably, the saturated removal capacities of Pb(II) on SCP were as high as 1720.57 mg/g calculated by the Langmuir isotherm model, exceeding largely that of the previously reported absorbents. Significantly, SCP displayed highly selective removal ability toward Pb(II) ions in the presence of the competing metal ions (Ni(II), Co(II), Zn(II), and Cd(II)). Further investigations indicated that such ultra-high removal efficiency and preferable affinity of Pb(II) ions on SCP may be reasonably ascribed to the formation of rodlike hydroxypyromorphite crystals on the surface of SCP via dissolution-precipitation and ion exchange reactions, accompanied by the presence of lead sulfide precipitates. High removal efficiency, fast removal kinetics and excellent selectivity toward Pb(II) made the obtained SCP material an ideal candidate for Pb(II) ions decontamination in practical application.
Key words:  Sulfur-containing calcium phosphate  Pb(II) ions  Selective removal
FundProject:
含硫磷酸钙纳米颗粒的制备及对铅离子的高效选择性去除
龚成云1,2, 耿志刚1, 董安乐1, 叶新新1, 汪国忠1, 张云霞1
1.中国科学院固体物理所, 中国科学院材料物理重点实验室, 环境与能源纳米材料中心, 安徽省纳米材料与纳米结构重点实验室, 合肥 230031;2.中国科学技术大学纳米科学技术学院, 苏州 215123
摘要:
用一种简易共沉淀法制备了非晶含硫磷酸钙(SCP)材料,实现硫原子原位引入磷酸钙纳米颗粒中,并研究了其对Pb(II)的吸附特性和机理。与羟基磷灰石相比,SCP对Pb(II)的去除性能显著增强,在10 min内能快速将20 ppm的Pb(II)溶液降低至饮用水标准下。由Langmuir吸附等温线模型计算可知,SCP对Pb(II)的最大饱和吸附量高达1720.57 mg/g,这个数值远远超过以往所报道的绝大部分吸附剂材料。在竞争离子Ni(II),Co(II),Zn(II)和Cd(II)共存的条件下,SCP还表现出对Pb(II)的选择性去除。研究表明,SCP对Pb(II)超高的去除效率和优异的亲和力归因于其可通过溶解沉淀和离子交换反应在其表面形成棒状的羟基磷酸铅晶体,以及形成沉淀物硫化铅。SCP以其对Pb(II)快速、高效和优异选择性成为在实际铅污染治理中的理想材料.
关键词:  含硫磷酸钙  铅离子  选择性去除
DOI:10.1063/1674-0068/29/cjcp1603045
分类号: