Study on removal of silver and polyethylene terephthalate from exposed radiography films using enzyme protease

被引：0
作者：
C. Arun
P. Maha Lakshmi
A. Sethupathy
S. Karthikeyan
P. Sivashanmugam
J. Rajesh Banu
机构：
[1] Koneru Lakshmaiah Education Foundation,Department of Biotechnology
[2] National Institute of Technology,Department of Chemical Engineering
[3] Central University of Tamilnadu,undefined
来源：
Journal of Material Cycles and Waste Management | 2021年 / 23卷
关键词：
Protease; X-ray film; Gelatine; Silver; Polyethylene terephthalate;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In the proposed method, crude enzymes extracted from waste dry leaves of 15 different plants showing protease activity were used for removal of silver from exposed medical X-ray film by hydrolysis of gelatin. Optimum operating pH and temperature for crude protease extract was found to be 7 and 50 °C, respectively. The X-ray film before and after protease treatment was analysed using FTIR (Fourier-transform infrared spectroscopy) and EDS (Energy-Dispersive X-Ray Spectroscopy). The slurry obtained after smelting process analysed using EDS shows 99.8% of silver recovery. The result confirms that the enzyme extraction process recovers silver and PET (polyethylene terephthalate) in eco-friendly treatment methodology when compared to conventional chemical treatment process.
引用
收藏
页码：1947 / 1954
页数：7
相关论文
共 60 条
[1]  
Khunprasert P(2008)Radiographic film waste management in Thailand and cleaner technology for silver leaching J Clean Prod 16 28-36
[2]  
Grisdanurak N(2001)Silver recovery from waste photographic films by an enzymatic method Turk J Chem 25 349-353
[3]  
Thaveesri J(2020)Ecologically derived waste management of conventional plastics J Mater Cycles Waste Manag 22 1-10
[4]  
Danutra V(2002)Clean technology for the recovery of silver from processed radiographic films Hydrometallurgy 63 277-280
[5]  
Puttitavorn W(2004)Orthogonal array design for the optimization of silver recovery from waste photographic paper Separ sci Technol 9 1953-1966
[6]  
Nakiboglu N(2013)Laboratory waste minimization by recovery of silver as nano-silver colloidal dispersion from waste silver chloride J Mater Cycles Waste Manag 15 342-347
[7]  
Toscali D(2018)Methods of silver recovery from radiographs—comparative study IOP Conf Ser Mater Sci Eng 16 415-434
[8]  
Yasa I(2014)Recycling of WEEE plastics: a review J Mater Cycles Waste Manag 76 300-305
[9]  
Lee A(1993)Kinetics and mechanism of enzymatic hydrolysis of gelatin layers of X-ray film and release of silver particles J Ferment Bioeng 59 15-32
[10]  
Liew MS(2002)Bacterial alkaline proteases: molecular approachesand industrial applications Appl Microbiol Biotechnol 20 1267-1269
123456