For all the good that is rooting, you may want to go back to the way things were. Whatever method you decide to attempt, make sure that you backup your data first.

Unroot with SuperSU

SuperSU allows you to unroot phones by simply going into the app’s settings and selecting the full unroot option. It is a really helpful option.
Open the SuperSU app. Go to Settings, and scroll all the way to the bottom until you see the Full unroot button. Tap it, hit continue, and the unrooting process will begin.

Unroot with Universal Unroot app

There is an app that will do some of the hard work for you. It is called Universal Unroot, and it gets rid of root privileges in most Android devices. But it is not perfect.
Most Samsung devices are not compatible, for starters. And LG devices will be unrooted, but still show as rooted afterwards.

Unroot by flashing stock firmware

One of the most thorough ways to remove root access is by flashing your device with factory firmware. It will wipe your phone or tablet clean of any root traces, but a word of warning: It is not for the faint of heart.

unroot by deleting the files 

that granted the root in the first place. We recommend using a file explorer app like ES File Explorer. Turn on Root explorer under Tools in the ES File Explorer menu and grant it root privileges, if asked.

1. Using Es explorer go to root folder '/'.
2. Go to system > bin, then tap and hold on busybox and su and delete them.
3. Now go to system > xbin, then tap and hold on busybox and su and delete them.
4. Finally, go to system > app and delete superuser.apk.
5. Restart the device and you should be unrooted.

Unroot with OTA update

Sometimes just installing an OTA update will break root. Look for a software update under Settings > About device. Just be careful, as with some root methods it might prove impossible to recover from. In that case, you may need to flash the original firmware first.
None of the root methods or unrooting methods are without risk, so always back up your data, make sure your device is fully charged, read the instructions carefully, and take your time.