Facile synthesis of reduced graphene oxide by Tecoma stans extracts for efficient removal of Ni (II) from water: batch experiments and response surface methodology

Table 5 Ni (II) adsorption capacity stated in literature studies compared to the present study

Adsorbent	pH (−)	Concentration (mg L^− 1)	Time (min)	Maximum adsorption capacity (mg g^− 1)	References
Reduced graphene oxide (rGO)	6	2	30	69	This study
Magnetic graphene oxide	7	60	25	51	[26]
Graphene oxide	8	350	270	102	[27]
Manganese ferrite-graphene oxide nanocomposite	8	350	270	152	[27]
Magnetite graphene oxide-chitosan nanocomposite	–	135	70	12	[42]
Graphene oxide-almond shell composite	7.5	200	180	69	[43]

ISSN: 2468-2039