Which type of green solvent ?

Green chemistry based on twelve principles and do not have any adverse effects on the environmental and health issues. If your method ensure high atom efficiency (more than 95%) of the product, used only green solvents and reagents, minimum or do not generate any hazardous byproducts, then we can say it is a green synthesis of nanoparticles. You may see the following:

https://en.wikipedia.org/wiki/Green_Chemistry_(journal)

https://en.wikipedia.org/wiki/Green_chemistry

Thanks

Green chemistry based on twelve principles. But how it will possible that we goes up to 90% green method ?

Green chemistry, also called sustainable chemistry, is an area of chemistry and chemical engineering focused on the designing of products and processes that minimize the use and generation of hazardous substances.

Sami you not answer my question properly

Synthesis using plant extract is the best method

Synthesis using plant is the best but

Is that method is 100% green ?

Not every method is 100% green. The one is best which show high atom efficiency

The biosynthesis of nanoparticles has been proposed as a cost-effective and environmentally friendly alternative to chemical and physical methods. Plant-mediated synthesis of nanoparticles is a green chemistry approach that connects nanotechnology with plants.

Apart from biosynthesis, is there any other method.?

Biosynthesis is a rough method...where no pure and size control products can be obtained

Use green solvent and capping agent

Which type of green solvent ?

Simple you can use water

See

Article Green synthesis of silver nanoparticles using Azadirachta in...

The product via plant based method is very less

Biosynthesis using plant is also best

Best but purification problem

Biosynthesis using plant extract both as reducing and capping agent

The product via plant based method is very less and also purification problem

Sir the yield is very low using this method

Only the biosynthesis at room temperature is pure green method

Tahir Saeed Khan

Welcome Dr

Which method you select ?

At a time plant mediated biosynthesis

Used small mount of Hydrazine

Yes hydrazine is a greener reagent

Of-course

If plant do the job, then why needed hydrazine ?

Zahir Ullah

In order to increase the yield

Medicinal plant do good job

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100% green synthesis when you, for example, isolated beta carotene from a plant, and then from it hydrolysis received vitamin A.

Article Supercritical CO2 drying of alginate/zinc hydrogels: A green...

Thanks Dear Hicham Abou Oualid

Thanks Yuri Mirgorod

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Excellent contribution to the discussion. They are absolutely meaningful. Thank you all

Green nanoparticles can easily be prepared without using chemical reducing agents such as hydrazine, sodium boraohydride etc. by using plant extract or use of biopolymers.

Thanks for your answer Dr Sadanand Pandey

Microwave assisted synthesis is also considered green as long as you use environmentally benign reductants and stabilizers such as glucose and starch. In addition, this synthesis process is rapid and the conversion is high.

https://www.nature.com/articles/s41598-018-23480-6

Thanks Ashiqur Rahman for the useful info

Plant mediated green synthesis

The salt precursor used in the synthesis is likely to be the most toxic chemical involved. For example silver salts can cause argyria. Platinum salts can cause platinosis. Nickel salts are highly toxic....

by using microbial species, or plant species. Sir but you must use certain chemicals like if you gonna synthesis Silver nano particles, you will must use silver nitrate solution. Sir Alan F Rawle

Mian Adnan Kakakhel Yes, I agree with you. However, my point is simply that the essential inorganic precursors are considerably more dangerous than the microbial or plant species. Thus, there will be no process that will be 100% green if we consider these chemicals. Look at the criteria in @Sami Khan's answer above ('using non-toxic reagents').

Recommend your answer sir Alan F Rawle

Thanks Mian Adnan Kakakhel

Plants are actually known to be the green nano factories.

Alan F Rawle Sir. I am agree with you, but without chemical how can you prepare? and 2nd: for silver nano synthesis, when we use silver nitrate, due to oxidation and reduction, it change into silver nano. i think in this case it will be non toxic.

Mian Adnan Kakakhel

In air, all the surfaces of the Ag species will be in the +1 oxidation state - and this silver oxide has some solubility in water. It’s also the active bactericide. The surface state can be shown by XPS.

Dear Muhammad Ismail ,

Nanoparticles are different classes majorly organic and inorganic. Inorganic nanoparticles are mostly metallic nanoparticles.

1. To prepare metallic nanoparticles, you must use chemical precursors such as metallic salts.

2. To prepare organic nanoparticles, you can use proteins (albumin) as precursors by simple crystallization procedure. This also involves chemical solvents.

3. Even in the preparation of plant extracts for green synthesis, you need to use high polar solvents for the extraction of effective polar compounds that can reduce the nanoparticles.

Hence, you can not possibly synthesize a 100% green nanoparticle. Even if you synthesize using aqueous extracts of plants, the effectiveness of reduction will be low.

All the Best

Thanks Abdul Azeez

I would suggest that most inorganic nanoparticles are oxides and aluminosilicates (silica, titania, alumina, clays). Most organic nanoparticles are polymeric and derived from petrochemicals.

Biosynthesis plant based method

Biosynthesis

Thanks Tahir Saeed Khan & Zahid Ali Khan

Dear,

Kindly, follow these articles to synthesize green nanoparticles.

Article Biofabrication, characterization and evaluation of photocata...

Article Green synthesis of silver nanoparticles from Tectona grandis...

Thanks Javed Iqbal

My pleasure Ismail bhaii, Thanks for being there on research-gate.

From plant extracts.

Thanks dear Doufnoune RACHIDA Rachida

Biosynthesis (using plant extract) but the product of this method comes in very low quantity.

That depends. What is your definition of "100% green" and what type of nanoparticles are you aiming for?

Here is a nice example for DIY green NP, also look at references at the bottom:

https://www.instructables.com/id/DIY-Quantum-DotsNanotech-in-Your-Kitchen/

And you go to google scholar and search for "green nanoparticles" you will find a lot of publications...

Thanks Dear Yoram Gerchman & Mohammed laid Tedjani

alternative methods, such as biochemistry and green chemistry