Self Purification
Self Cleansing
noun, する verb
If you purify your self you are performing self purification.
じじょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この事件が業界の自浄を促すだろう。
This incident will promote the self-purification of the industry.