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Ladder network is actualy voltage multiplier rectifier. You can use mains voltage to supply such ionizator. Use 1N4007 diodes and 50nF/400V capacitors and apropriate number of cells to reach 8kV. At the highest voltage solder needle. Behind the needle it's good to place wire connected on lowest potential. Such ionizator must be placed ih plastic housing. In front of needle drill 4cm^2 of 2mm holes.
Look to this construction it has comments on Russian, but I will translate:
1. Metallic or glass pipe.
2. Rubber tap.
3. Glass pipe.
4. Foil around pipe, you need to make isolation above it.
5. Wire #1
6. Wire #2
7. To output sprayer.
8. Alluminum foil, you need to make holes on it by needle, as many as
possible, then turn it to pipe with spikes to outer side. You need to
close this pipe by taps in 2 ends.
9. Tap on the end of alluminum pipe.