Did can I get refund for Shanghai public transport card? And where can I buy and get refund?

Of course you can get refund if you don't use the card anymore. There are many places that sell this card, including some large railway stations, the subway stations, Kede and Haode convenience stores... these places also provide the refund service. Or you can provide your living place. Then I can find the nearest service counter for you.

My flight lands at Pudong airport.

You can buy the card at the Service Counter of Metro Station inside the PVG. You can easily find the place based on the English signs.

Thanks