Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-adjusted Meranti Sawdust

Abstract

In recent years, the need for safe and modern composite barrier for the prevention of groundwater contamination and the provision of Geo-environmental protection has been studied together with the need of designing low cost and effective liner for isolating landfill contents from the environment. In this study, various mix designs involving two natural adsorbents, the Na-Bentonite and the pH-adjusted sawdust were prepared for a series of Geo-environmental experiments to be carried out to determine the adsorption capacity, buffering capacity, pH changes, and COD changes among others, in the presence of Pb(NO3)2 contaminant concentrations. Generally, the results showed an increase in adsorption capacity in the acidic segment of the treatment. An increase of 58% of the adsorption efficiency of the Na-Bentonite in adsorbing the contaminant at the highest concentration was the most important achievement of the system while in the acidic segment.

Adsorptive removal of Pb(II) and Cd(II) ions from aqueous solution onto modified Hiswa iron-kaolin clay: Equilibrium and thermodynamic aspects

“…Nowadays, nanomaterials have provided a promising technique for removal of toxic heavy metal ions from water, aqueous solutions and industrial wastewater, due to its low cost-effective, high efficiency, and simple to operate. Different natural minerals and the composites are studied such as montmorillonite (Barbier et al, 2000), zeollitic tuff (Budianta et al, 2020), bentonite (Mohajeri et al, 2018), expanded perlite (Torab-Mostaedi et al, 2010), natural zeolite (Panayotova, M., Velikov, B., 2002), natural diatomite (ElSayed, 2018), natural clay (Bedelean et al, 2009), activated alumina (Naiya et al, 2009), activated phosphate rock (Elouaer et al, 2008 ), ball clay (Rao and Kashifuddin, 2016), hydroxyapatite porous materials (Ramdani et al, 2020), manganoxide minerals (Sónmezay et al, 2012), natural phosphate (Yaacoubia et al, 2014), natural calcite (Yavuz et al, 2007), Sepiolite (Padilla et al, 2011), polyvinyl www.bosaljournals/chemint/ editorci@bosaljournals.com alcohol-modified kaolinite clay (Unuabonah et al, 2008), hydroxyapatite/chitosan composites (Park et al, 2015), polyphosphate-modified kaolinite clay (Amer et al, 2010), alkaline modification of kaolin (David et al, 2020), Nano kaolinite (Alasadi et al, 2019) unmodified and modified kaolinite clay (Al-Essa and Khalili, 2018;Abukhadra et al, 2019), magnetic core-zeolitic shell nanocomposites (Padervand and Gholami, 2013), natural mixture of kaolinite-albite-montmorillonite-illite clay (Eba et al, 2011), kaolinite and montmorillonite surfaces (Gupta and Bhattacharyya, 2008), Al( 13)-pillared acid-activated montmorillonite (Yan et al, 2008). hydroxyapatite/alginate/gelatin nanocomposites (Sangeetha et al, 2018), Iron nanocomposite and modified by Fe-S nanoparticles (Shahryari et al, 2019), thiol-lignocellulos...…”