Thi Tuong Van Tran, Mai Lien Tran, Chi Hieu Nguyen
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Abstract
Background
In this work, we conducted a carboxylation process on a pristine nanomaterial – graphene oxide (GO), to improve the number of its carboxyl functional groups and thereby its adsorption performance towards heavy metal ions in wastewater.
Methods
The carboxylated GO, denoted as GO-COOH, was prepared via a carboxylation procedure with chloroacetic acid as a precusor. Characterization analyses including FESEM, BET, XRD, FTIR and zeta potential, and batch adsorption experiments towards Pb2+ and Cu2+ ions in aqueous solution were carried out to evaluate characterization and adsorption ability of the prepared materials.
Significant findings
The adsorption capacity for Pb2+ increased from qmax = 279.70 mg/g (GO) to qmax = 364.37 mg/g (GO-COOH0.5), meanwhile the qmax values for Cu2+ of GO and GO-COOH0.5 were 124.04 mg/g and 137.69 mg/g, respectively. The materials were also examined through a resuablity test and further used for a real wastewater from an industrial park in Ho Chi Minh City, Vietnam. It was found that the GO-COOH0.5 preserved relatively high adsorption capacity (67–69 %) after 5 cycles. Additionally, the GO-COOH0.5 exhibited higher removal efficiency for all metal ions present in the real wastewater as compared to GO, indicating potential applications of carboxylated GO adsorbent in practical wastewater treatment.
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The journal includes papers in the following areas:
– Simple organic liquids and mixtures
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