id	keyword
ajec-180	cr(vi
ajec-180	removal
ajec-180	et.al
ajec-180	chromium
ajec-180	vol
ajec-180	adsorbent
ajec-180	adsorption
ajec-180	journal
ajec-180	acbbm
ajec-180	solution
ajec-180	water
ajec-180	metal
ajec-180	hexavalent
ajec-180	carbon