Journal
RSC ADVANCES
Volume 5, Issue 90, Pages 73333-73339Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra06493g
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Funding
- National Natural Science Foundations of China [20775067, 20977074, 21175115, 21475055]
- Science & Technology Committee of Fujian Province, China [2012Y0065]
- Program for New Century Excellent Talents in University [NCET-11 0904]
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Hollow and pellet-like reduced graphene oxide (P-RGO) was synthesized by electrostatic assembly and acid-treatment. The average size and shell thickness of P-RGO were 65.9 nm and 4 nm, respectively. The adsorption capacity of P-RGO for lead ions was as high as 184.5 mg g(-1) and the adsorption equilibrium of lead ions (50 mg L-1) was achieved within 5 min. Lead ion removal by adsorption onto P-RGO increased with decreasing pH. Because P-RGO exhibited stronger affinity for lead ions than for water, lead ions could be drawn and stored into the cavity in the P-RGO, i.e., ions storage effect was observed. This led to high adsorption capacity and abnormal adsorption behavior. The adsorption mechanism was proposed as ions exchange and competitive process for layer RGO and P-RGO, respectively. This study suggested that structure reconstruction of materials could enhance the efficiency and capacity for unique metal removal.
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