Removal of copper through adsorption by magnesium hydroxide nanorod

Abstract

a b s t r ac tIn this study, the magnesium hydroxide nanorod (MHN) was successfully prepared by precipitationrecrystallization method, which was chartered with X-ray diffraction, transmission electron microscope and scanning electron microscope. In view of superiority, MHN was used as adsorbent to adsorb copper ions from wastewater. A range of tests in regard to the effect of initial Cu 2+ ion concentration, initial solution pH value, contact time and MHN dosage on adsorption of Cu 2+ ion from wastewater were investigated. The results revealed the investigated factors which can have a profound effect on adsorption of Cu 2+ ion. The adsorption capacity reached about 250 mg/g within 50 min, showing that MHN had rapid adsorption effect to Cu 2+ ion. By fitting three kinetic equations, the pseudo-secondorder kinetic equation was found to fit the best adsorption behavior. The analysis of equilibrium isotherm proved that the adsorption behavior was in accordance with the Langmuir equation, and MHN had favorable adsorption capacity to copper ion (324 mg/g and 318 K). The obtained thermodynamic data exhibited that the adsorption behavior was viable, initiative and endothermic, and the degree of disorder was increasing. The testing on MHN regeneration was evaluated by desorbing the MHN copper-adsorbed in 0.1 M NaCl solution or 0.1 M sodium ethylenediaminetetraacetic acid (EDTA) solution. The removal efficiency after eight cycles still reached to 75% for regeneration with EDTA treatment. In conclusion, the presented results demonstrated the potential use of MHN in adsorbing copper ion from wastewater because of its speediness, high adsorption capacity and recyclability.

Polyamide nanocomposites containing hydrazide–hydrazone group reinforced with functionalized polyethyleneimine modified Mg(OH)2 nanoparticles: Study on thermal properties, combustion resistance, and lead ion adsorption

“…HRR, heat release rate; PA, polyamide; PANC, polyamide nanocomposites Furthermore, magnesium hydroxide was recognized as having a highly reactive surface for the removal and separation of the water pollutants such as heavy metals. [62][63][64] Thus, the surface modification of MDH with organic structures containing free amine groups, imine-derived phenolic structures, and hydroxyl groups can be appropriate for the adsorption of heavy metal ions. [65] PEI can act to adsorb heavy metal ions through amine groups in its structure, but due to its high water solubility cannot be used singly for this purpose.…”

Engineering Electronic Structure and Band Alignment of 2D Mg(OH)2 via Anion Doping for Photocatalytic Applications

“…Widely available and non-toxic Mg(OH) 2 represents a fine example of multifunctional compounds with extensive technological and industrial applications [ 1 ], such as removing pollutants using its adsorptive and coagulative properties [ 2 , 3 , 4 , 5 , 6 ], acting as an effective antibacterial agent [ 7 ], protecting paper by reducing the paper ageing [ 8 ], adding as a component in organic-inorganic composite membrane [ 9 , 10 ], utilizing as a new-generation flame retardant and smoke suppression [ 11 , 12 ]. In addition, Mg(OH) 2 has been considered as a photocatalyst for degradation of organic dyes in wastewaters, such as Rhodamine B [ 13 ], and methyl orange [ 14 ], and for CO 2 conversion to solar fuels such as CO, CH 4 , CH 3 OH, HCOOH, and HCOH [ 15 , 16 ].…”