Adsorption of Cd and Ni from water by graphene oxide and graphene oxide–almond shell composite

Abstract

The present study describes the preparation and capability of the graphene oxide/almond shell (GO@AS) composite by a freeze-drying method. The composite showed excellent ability to uptake nickel and cadmium ions, which were characterized by Fourier transform infrared spectrum and scanning electron microscopy techniques.The optimized values of pH, contact time, and adsorbent doses were found to be 7.5, 30-180 min, and 0.1 g, respectively. Also, adsorption isotherms of metal ions on adsorbents were determined and correlated with common isotherm equations such as Langmuir and Freundlich models. The maximum sorption capacities of GO@AS calculated from Langmuir isotherm model were 121.95 mg/g for Cd (II) and 69.93 mg/g for Ni (II). A higher adsorption capacity was for Cd (II) on GO@AS. © 2019 Water Environment Federation • Practitioner points • Synthesis of graphene oxide-almond shell composite. • Removal of Cd and Ni ions from water by graphene oxide-almond shell composite. • Study of isotherm adsorption models.

Carbon nanotubes/Al2O3 composite derived from catalytic reforming of the pyrolysis volatiles of the mixture of polyethylene and lignin for highly-efficient removal of Pb(ii)

“…15 Similarly, the adsorption ability of graphene oxide towards Cd(II) and Ni(II) was found to be greatly improved as it was incorporated with almond shell (graphene oxide/ almond shell composite) by a freeze-drying method. 16 However, it is worth noting that a complex assembly or synthesis process is generally needed for the preparation of desirable carbon nanomaterials-contained composites, which hence brought a large amount of wastage and cost as well as extra wastes. Interestingly, various carbon nanomaterialscontained composites being considered as by-products or industrial wastes are inevitably and largely being produced in daily industrial production, such as catalytic pyrolysis or reforming-involved industries.…”

“… 15 Similarly, the adsorption ability of graphene oxide towards Cd( ii ) and Ni( ii ) was found to be greatly improved as it was incorporated with almond shell (graphene oxide/almond shell composite) by a freeze-drying method. 16 …”

Modification of Fishbone-Based Hydroxyapatite with MnFe₂O₄ for Efficient Adsorption of Cd(II) and Ni(II) from Aqueous Solution

“…After Ni(II) adsorption, they shifted to 3412, 1584, 1433, 990, 920, 561, and 525 cm -1 , while after Cd(II) adsorption, they were observed at 3385, 1603, 1435, 1013, 930, 570, and 534 cm -1 . The peak shifts to the lower frequencies indicate that the formation of composite bonds with Ni(II) and Cd(II) requires less energy for vibration [33].…”

Coked Ni/Al2O3 from the catalytic reforming of volatiles from co-pyrolysis of lignin and polyethylene: preparation, identification and application as a potential adsorbent

“…17 In the study of Yari Moghaddam et al, graphene oxide/almond shell composite fabricated by a freeze-drying method showed more effectiveness than a pure graphene oxide in the removal of cadmium (II) and nickel(II). 18 Nevertheless, a complex synthesis process is often needed for the preparation of an ideal carbon composite, which produces many by-products and requires additional costs.…”