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Green method | Biological method (Microorganism) | Physical method | Chemical method |
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Safe, clean and one step | Simple and easy | Complex and time consuming | Complex and require vigorous processing |
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Do not require high pressure, energy and temperature | Do not require high pressure, energy and temperature | High energy, pressure and temperature required | Require high temperature, toxic and potentially hazardous chemicals |
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Eco-friendly, pollution free, biocompatible and highly stable | Eco-friendly and stable | Produced hazardous by-products and pollution | Produced hazardous by-products and pollution |
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Fast, cost effective and sustainable | Slow but Cost effective | Required expensive and highly complex equipment | Require costly chemicals and solvents |
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Natural phytochemicals present in plant extracts act as reducing and stabilizing agent | Chemical reducing and stabilizing agent does not required | Chemical reducing and stabilizing agent required | Toxic reducing chemicals and stabilizing agents required i.e., hydrazine, sodium borohydride |
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Require very low maintenance | Isolation, culturing of microorganism are time consuming and require more maintenance | Require high maintenance | Require high maintenance |
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