Abstract
Tin and its derivatives are extensively used in modern technology tools which lead requirement for development of green methods for its waste management and profitable recycling. Presence of tin in water bodies causes enormous environmental concern due to its acute toxicity to living beings. We demonstrate a simple and zero emission process for extraction of tin ions from aqueous solution using dithiocarbamate-based copolymer and its single step quantitative recovery and transformation into SnS nanoparticles. The polymer shows high metal extraction capacity, 1.06 g SnCl2 per gram of polymer. The polymer metal composite and SnS nanoparticles are analyzed using TEM, FTIR, XRD spectroscopy techniques. The FTIR shows formation of Sn-S bonding in the polymer metal composite. This study has implication for cost effective and green approach for purification of water and waste management.
Highlights
Tin is a high value metal and its compounds are used in many modern and conventional industrial processes such as lithography, alloys for electronic circuits, reaction catalysis, anti corrosion coating agent, dopant for electrode of modern solar cells [1,2,3,4,5,6,7]
There are peaks with respect to the Cu which are due to the copper grid used for the Transmission electron microscope (TEM) imaging
The Sn-PA1 composite was analyzed by atomic absorption spectroscopy (AAS) and CHNS elemental analysis (Table 1)
Summary
Tin is a high value metal and its compounds are used in many modern and conventional industrial processes such as lithography, alloys for electronic circuits, reaction catalysis, anti corrosion coating agent, dopant for electrode of modern solar cells [1,2,3,4,5,6,7]. The extensive industrial use leads to problems such as leaching of metal in waste water streams [8,9,10,11] This calls for the requirement for waste disposal and efficient recycling of expensive metal and its compounds. A new removal and extraction technique is required which can efficiently remove metal from the aqueous streams and recover the same in some high value final product [17]. The dithiocarbamate (DTC) based polymers are known for high metal extraction potential [14,18,19,20,21]. We present a simple and efficient green process for extraction of tin from aqueous medium using a DTC-based polymer PA1 and recovery of tin as tin sulfide nanoparticles via thermal decomposition of the Sn-PA1 extract.
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