Citation: Saba Noor, Muhammad Waseem, Umer Rashid, Muhammad Anis-ur-Rehman, Wajid Rehman, Khalid Mahmood. Fabrication of NiO coated SiO₂ and SiO₂ coated NiO for the removal of Pb²⁺ ions[J]. Chinese Chemical Letters, ;2014, 25(05): 819-822. doi: 10.1016/j.cclet.2014.01.040 shu

Fabrication of NiO coated SiO₂ and SiO₂ coated NiO for the removal of Pb²⁺ ions

1.
a Department of Chemistry, Hazara University, Mansehra 21300, Pakistan;
2.
b Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000, Pakistan

Corresponding author: Muhammad Waseem,
Received Date: 29 July 2013
Available Online: 16 January 2014

We have prepared silica, SiO₂ coated NiO and NiO coated SiO₂ by sol-gel method. The physicochemical properties of the desired materials were investigated by surface charge properties, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, surface area measurements and X-ray diffraction (XRD) analyses. The point of zero charge (PZC) of the solid was determined by the salt addition method. In coated materials, two PZC values were noted representing the surface charge of their counterparts. The SEM image of SiO₂ coated NiO displays a uniform coating of silica on the surface of NiO, whereas in case of NiO coated SiO₂, a honeycomb like appearance was observed with highly porous structures. In the diffractograms of NiO, the characteristic peaks were suppressed in NiO coated silica, however, no diffraction peak could be seen in SiO₂ coated NiO. Batch adsorption technique was applied for the removal of Pb²⁺ ions from aqueous solution. The sorption trend for Pb²⁺ ions was observed in the order of NiO coated SiO₂ > SiO₂ coated NiO > NiO > SiO₂. This trend confirms that the coated materials have more sorption capacities than their parent counterparts.
- Characterization,
- Coated materials,
- Lead removal,
- Sol-gel
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沈阳化工大学材料科学与工程学院沈阳 110142

Fabrication of NiO coated SiO2 and SiO2 coated NiO for the removal of Pb2+ ions

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通讯作者: 陈斌, bchen63@163.com

Fabrication of NiO coated SiO₂ and SiO₂ coated NiO for the removal of Pb²⁺ ions