Dithiocarbamate modification of activated carbon for the efficient removal of Pb(ii), Cd(ii), and Cu(ii) from wastewater
- 11 February 2022
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in New Journal of Chemistry
- Vol. 46 (11), 5234-5245
- https://doi.org/10.1039/d1nj05293d
Abstract
In this study, dithiocarbamate functionalized activated carbon (DTC-AC) was synthesized with nitric acid, tetraethylenepentamine (TEPA), and carbon disulfide (CS2). N2 adsorption-desorption technology, SEM, FTIR, and elemental analysis demonstrated the successful preparation of adsorption materials. Batch adsorption experiments were conducted to evaluate the influence of variable conditions on the adsorption behavior of Pb(II), Cu(II), and Cd(II) onto DTC-AC. Experimental data were fitted with adsorption kinetics models and isothermal models. The findings confirmed that DTC-AC exhibited a good heavy metal adsorption capacity superior to oxidized AC (O-AC) and AC, and that pH played an important role in heavy metal removal efficiency by altering surface charge. The adsorption kinetics study showed that the adsorption equilibrium was attained within 20 min, and the adsorption rate was dependent on both physisorption and chemosorption. The Langmuir model best described adsorption performance, and the maximal single metal uptake for Pb(II), Cu(II), and Cd(II) were 203.36, 53.13, and 102.89 mg/g, respectively. Moreover, DTC-AC showed selective adsorption for Pb(II) in the ternary metal species system. Additionally, thermodynamic parameters showed that the adsorption process of heavy metals onto DTC-AC was spontaneous and endothermic. The heavy metal removal efficiency of DTC-AC remained above 85% after five consecutive adsorption-desorption cycles. This study showed that DTC-AC is an effective and reusable adsorbent with great application potential in remediating heavy metal pollution.Keywords
Funding Information
- National Natural Science Foundation of China (21775035)
- Key Research and Development Program of Hunan Province of China (2018SK2048)
This publication has 69 references indexed in Scilit:
- Synthesis and characterization of dithiocarbamate chelating resin and its adsorption performance toward Hg(II), Cd(II) and Pb(II) by batch and fixed-bed column methodsJournal of Environmental Chemical Engineering, 2013
- Characteristics of heavy metals capturing agent dithiocarbamate (DTC) for treatment of ethylene diamine tetraacetic acid–Cu (EDTA–Cu) contaminated wastewaterChemical Engineering Journal, 2012
- Competitive adsorption of Pb(II), Cu(II) and Zn(II) onto xanthate-modified magnetic chitosanJournal of Hazardous Materials, 2012
- Synthesis of a novel silica-supported dithiocarbamate adsorbent and its properties for the removal of heavy metal ionsJournal of Hazardous Materials, 2011
- Preparation and chelation adsorption property of composite chelating material poly(amidoxime)/SiO2 towards heavy metal ionsChemical Engineering Journal, 2010
- Chemically modified activated carbon with 1-acylthiosemicarbazide for selective solid-phase extraction and preconcentration of trace Cu(II), Hg(II) and Pb(II) from water samplesJournal of Hazardous Materials, 2009
- Application of orange peel xanthate for the adsorption of Pb2+ from aqueous solutionsJournal of Hazardous Materials, 2009
- Modifying activated carbon with hybrid ligands for enhancing aqueous mercury removalCarbon, 2009
- Selective removal of copper and lead ions by diethylenetriamine-functionalized adsorbent: Behaviors and mechanismsWater Research, 2008
- Binding of hard and soft metal ions to Rhizopus arrhizus biomassEnzyme and Microbial Technology, 1995