Dear Mohammad

This is not possible. In dried leaf powder it is impossible to remove the chlorophyll until/unless any treatment. But it may possible once you get extracted it with various solvent and you may remove the coloring matter of your extract by adding sufficient quantity of activated charcoal.  

One way is to clean up your samples with dispersive or cartridge SPE containing graphitized carbon black (GCB) and primary secondary amine (PSA). This is very common clean up step that is used in QuEChERS sample prep, typically used for fruit and vegetable samples but has recently been applied to other samples such as vegetation and animal tissue. It's worth reading up on. 

Extraction with acetone at RT under stiring will remove most of the lipophilc leaf dyestuffs such as neoxanthin, violaxanthin, xanthophylls, chlorophylls a and b, phaeophytin and carotenoids. If not complete at first extraction, filter and repeat until acetone is nearlycolorless.

Petroleum ether extraction is usually performed for plant materials especially leaves to get rid of chlorophylls and other pigments as well as fatty materials. The process is called as defatting...This will remove most of the lipophilic compounds..and the extraction can be done with the required solvent then...

for all hydrophobic compounds you should start with least polar solvents like Petroleum benzene, n-hexane, dichloromethane respectively....to remove all the chlorophylls

Have you ever think using make column with stable phase is Activated carbon? 

Dear Mohammad

This is not possible. In dried leaf powder it is impossible to remove the chlorophyll until/unless any treatment. But it may possible once you get extracted it with various solvent and you may remove the coloring matter of your extract by adding sufficient quantity of activated charcoal.  

Use MCI gel ， it is good to remove the chlorophyll.  

Thank you all for suggestions.

I used n-hexane to remove the green pigment from the leaf part during extraction while pet-ether is usually used to remove chlorophyll,

Your objective might not be only to remove chlorophyll. It might be to extract some active constituent. It is not at all possible to remove the chlorophyll from leaf in its solid form. One has to extract it with suitable solvent taking care of the active constituent (it should not loss). After preliminary extraction to remove chlorophyll (if active constituent does not come in this extract) you can go for another solvent to selectively extract your target compound in main extraction. But if your target compound comes in the preliminary extract, you have change the solvents depending on solubility of your target compound and you can use the conventional adsorbents like activated charcoal, diatomaceous earth to remove chlorophyll or colored pigments (provided the target compound is not lost).

It depends on the compounds that do you want to extract after to remove the chlorophyll, but normally chlorophyll is extracted with acetone. You can also use the adsorbents like activated charcoal or diatomaceous earth that remove colored pigments, and chlorophyll is also a colored pigment.

Chlorophyll and the other apolar compound can be extracted with n-hexana, because n-hexana is apolar solven.

after extraction with any solvent, dry it, dissolve it in the mehanol, if possible, then you can use polyamide adsorbent in a column, and eluted with methanol , i did it once and it works

Check these interesting links

https://www.researchgate.net/post/How_could_we_remove_chlorophyll_from_plant_extracts_during_purification_of_natural_compounds?tpr_view=cf963c49-6fdb-43d5-a01f-f1e47d31e8b6_1

https://www.researchgate.net/post/How_can_I_remove_chlorophyll_from_leaf_extract

https://www.researchgate.net/post/I_would_like_to_know_about_the_method_of_separating_chlorophyll_from_ethanolic_extracts_from_celtis_africana#557153915dbbbd835b8b4571

https://www.researchgate.net/post/How_can_I_remove_chlorophyll_from_plant_extract?tpr_view=12502d85-0415-4a8a-9419-c5db2a876cb3_2

https://www.researchgate.net/post/What_is_the_best_way_to_isolate_leaves_with_a_lot_of_chlorophyll

https://www.researchgate.net/post/How_can_I_remove_chlorophyll_from_leaf_extract_without_losing_other_secondary_metabolites