Adsorption and Desorption of Heavy Metals onto Natural Clay Material: Influence of Initial pH

Lukman, Salihu; Essa, Mohammed H.; Mu’azu, Nuhu Dalhat; Bukhari, Alaadin A.; Basheer, C.

doi:10.3923/jest.2013.1.15

Cited by 80 publications

(51 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The adsorption selectivity sequences obtained using the coefficient of distribution for the single and multicomponent scenarios are Cr > Pb > Cu > Cd > Zn and Cr > Cu > Pb > Cd > Zn, respectively [24]. Srivastava et al [34] have reported similar selectivity sequence for the multicomponent scenario.…”

Section: Resultsmentioning

confidence: 99%

Coupled Electrokinetics‐Adsorption Technique for Simultaneous Removal of Heavy Metals and Organics from Saline‐Sodic Soil

Lukman

Essa

Mu’azu

et al. 2013

The Scientific World Journal

View full text Add to dashboard Cite

In situ remediation technologies for contaminated soils are faced with significant technical challenges when the contaminated soil has low permeability. Popular traditional technologies are rendered ineffective due to the difficulty encountered in accessing the contaminants as well as when employed in settings where the soil contains mixed contaminants such as petroleum hydrocarbons, heavy metals, and polar organics. In this study, an integrated in situ remediation technique that couples electrokinetics with adsorption, using locally produced granular activated carbon from date palm pits in the treatment zones that are installed directly to bracket the contaminated soils at bench-scale, is investigated. Natural saline-sodic soil, spiked with contaminant mixture (kerosene, phenol, Cr, Cd, Cu, Zn, Pb, and Hg), was used in this study to investigate the efficiency of contaminant removal. For the 21-day period of continuous electrokinetics-adsorption experimental run, efficiency for the removal of Zn, Pb, Cu, Cd, Cr, Hg, phenol, and kerosene was found to reach 26.8, 55.8, 41.0, 34.4, 75.9, 92.49, 100.0, and 49.8%, respectively. The results obtained suggest that integrating adsorption into electrokinetic technology is a promising solution for removal of contaminant mixture from saline-sodic soils.

show abstract

Section: Resultsmentioning

confidence: 99%

Coupled Electrokinetics‐Adsorption Technique for Simultaneous Removal of Heavy Metals and Organics from Saline‐Sodic Soil

Lukman

Essa

Mu’azu

et al. 2013

The Scientific World Journal

View full text Add to dashboard Cite

show abstract

“…Specific areas of interest for monitoring include advanced industrial processes, aquatic biological communities and waste-stream effluents [4]. Heavy metals can spread from waste-stream effluents in landfills, recycling areas and mine deposits, which contaminate the surrounding environment [5][6][7][8][9]. Connel et al [10] could show that there is a link between desorption of heavy metals and the pH level of the surrounding soil and water.…”

Section: Introductionmentioning

confidence: 99%

Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate

et al. 2018

View full text Add to dashboard Cite

Environmental monitoring of land, water and air, is an area receiving greater attention because of human health and safety concerns. Monitoring the type of pollution and concentration levels is vital, so that appropriate contingency plans can be determined. To effectively monitor the environment, there is a need for new sensors and sensor systems that suits these type of measurements. However, the diversity of sensors suitable for low, battery powered-and large area sensor systems are limited. We have manufactured and characterized a flexible pH sensor using laser processing and blade coating techniques that is able to measure pH between 2.94 and 11.80. The sensor consists of an interdigital capacitance with a pH sensitive hydrogel coating. Thin sensors can reach 95% of their final value value within 3 min, and are stable after 4 min. Good repeatability was achieved in regard to cycling of the sensor with different pH and multiple measurements from dry state. We have also studied the relation between an interdigital capacitance penetration depth and hydrogels expansion. We believe that our passive sensor is suitable to be used in low power and large area sensor networks.

show abstract

“…The release of heavy metal ions through wastewater effluent discharges from various industrial processes has been a global phenomenon (Lukman et al, 2013;Mu'azu et al, 2017a;Uddin, 2017). The presence of heavy metal ions in the environment is serious as they are toxic (even at low concentration) and nonbiodegradable, they easily bioaccumulate once they enter into the food chain (Mu'azu et al, 2017a;Uddin, 2017).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Influence of Clay Montmorillonite Content on the Aqueous Uptake of Lead and Zinc

Mu’azu

2018

Water Environment Research

View full text Add to dashboard Cite

This study investigated the influence of montmorillonite content in a natural clay on the aqueous uptake of lead and zinc, using factorial design analysis. The effects of initial pH, montmorillonite content, initial metal concentration, and adsorbent mass on the sorption capacity of lead and zinc were evaluated using variance analysis. Increasing montmorillonite content had an insignificant effect on lead adsorption capacity whilst significantly influencing that of zinc. Comparable equilibrium sorption capacities for lead and zinc were achieved when the retention time for zinc adsorption was significantly increased and montmorillonite content was high. Under experimentally verified operating conditions, pseudo-second-order and pseudo-first-order kinetics, respectively, described the ions adsorption process with intraparticle diffusion not the sole rate-controlling step. These results suggest that the montmorillonite content in natural clays exhibits distinct affinity behaviors towards the uptake of different heavy metals. This is expected to divergently influence processes such adsorption and electrokinetic remediation, for clays with differing montmorillonite content.

show abstract

Adsorption and Desorption of Heavy Metals onto Natural Clay Material: Influence of Initial pH

Cited by 80 publications

References 26 publications

Coupled Electrokinetics‐Adsorption Technique for Simultaneous Removal of Heavy Metals and Organics from Saline‐Sodic Soil

Coupled Electrokinetics‐Adsorption Technique for Simultaneous Removal of Heavy Metals and Organics from Saline‐Sodic Soil

Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate

Evaluation of the Influence of Clay Montmorillonite Content on the Aqueous Uptake of Lead and Zinc

Contact Info

Product

Resources

About