Fast 4-nitrophenol Reduction Using Gelatin Hydrogel Containing Silver Nanoparticles

Mazhar Ul-Islam 1, Email

Jawad Ali 2

Waliullah Khan 3

Adnan Haider 4

Nasrullah Shah 3

Md. Wasi Ahmad 1

Muhammad Wajid Ullah 5, Email

Guang Yan 5, Email

1 Department of Chemical Engineering, College of Engineering, Dhofar University, Salalah, Sultanate of Oman

2 Department of Environmental Science, Faculty of Life Sciences and Informatics, Balochistan University of Information Technology Engineering and Management Sciences, Quetta, Pakistan

3 Department of Chemistry, Abdul Wali Khan University Mardan, Mardan, Pakistan

4 Department of Chemistry, Kohat University of Science and Technology, Kohat, Khyber Pakhtunkhwa, Pakistan

5 Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China


The current study reports the synthesis of gelatin hydrogel containing silver nanoparticles (AgNPs) and its role as a catalyst. A porous gelatin hydrogel, with pore size of 15-100 nm, was prepared by cooling its hot solution to room temperature with glutaraldehyde as crosslinker. The gelatin hydrogel was immersed in 1 mM silver nitrate solution for 24 h through ex-situ impregnation. The impregnation of AgNPs was confirmed through the field-emission scanning electron microscopy (FE-SEM) which showed the uniform dispersion of nanoparticles on the hydrogel surface and partial impregnation into the matrix. Thermogravimetric analysis (TGA) showed the impregnation of 9 wt% of AgNPs in the hydrogel composite which also contributed to its improved thermal properties. X-ray diffraction (XRD) analysis confirmed the amorphous nature of gelatin and addition of AgNPs. The AgNPs/gelatin hydrogel effectively reduced 4-nitrophenol by sodium tetrahydrorate at a reaction rate constant of 0.498 min-1. The prepared AgNPs/gelatin hydrogel could be used as a catalyst for other similar types of reactions.

Fast 4-nitrophenol Reduction Using Gelatin Hydrogel Containing Silver Nanoparticles