Arsenic removal from groundwater by Anjili tree sawdust impregnated with ferric hydroxide and activated alumina

Abstract

Arsenic is a toxic element found naturally in groundwater. Due to its carcinogenicity, risk for heart diseases and diabetes, arsenic needs to be removed from groundwater for potable application. ‘Anjili’ tree sawdust was chemically modified with ferric hydroxide and activated alumina (SFAA) and used as an adsorbent for the removal of arsenic from groundwater. The adsorbent was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) to study the pore structure and surface functional groups. Effect of contact time, initial concentration, pH, particle size and temperature was studied. Arsenic adsorbed by SFAA followed Freundlich adsorption isotherm. Maximum sorption of arsenic by SFAA adsorbent occurred at pH 6.5. Arsenic sorption kinetics followed a pseudo-second-order model. The maximum sorption capacity at 303 K was found to be 54.32 mg/g for As(III) and 77.60 mg/g for As(V). Interference of other ions on the adsorption was in the order of PO43− > SO42− > HCO3− > NO3−.

Effect of Fe oxidation state (+2 versus +3) in precursor on the structure of Fe oxides/carbonates-based composites examined by XPS, FTIR and EXAFS

“…At the same time, anion removal of the former was stronger than of the latter. Sorption capability of Fe(II)-150 to arsenic species (arsenate and arsenite) was found to be on an approximately the same level as of the first commercial inorganic anion exchanger, developed in the beginning of 21 st century, activated alumina (Al 2 O 3 ) (<10 mg/g), [36]. Because composite Fe(III)-150 was grounded on Fe oxides, which were complemented by negligible quantities of Fe carbonate on the material surface, it was expected to be a stronger anion remover than Fe(II)-150, which was predominantly formed upon Fe carbonates, however the removal of the former of the several investigated anions was very weak.…”

Adsorption of chromium (Cr) from tannery wastewater using low-cost spent tea leaves adsorbent

“…Now tea waste generated from café, teashops or factories are discarded into environment without any treatment (Nandal et al 2014). Some researchers have worked on different low-cost available adsorbent (Nandal et al 2014; Dhanasekaran and Satya 2016;Ozdes et al 2009;Wang et al 2006;Aikpokpodion et al 2010) for the removal of heavy metals from wastewater such as saw dust, rice husk, bagasse, tea waste. Waste mud from copper mine can be used as adsorbent for the removal of Pb (II) ions from aqueous solutions (Ozdes et al 2009).…”

Removal of As(III) from Water by Cellulase Templated TiO2: A Photocatalytic Oxidation Conjugated Adsorption Process

“…Biological templates have been investigated for the synthesis of porous inorganic materials, as they can derive morphologically controllable materials with structural specificity and unique functions [23][24][25][26][27]. In another study, we showed that the specific surface area of TiO2/SiO2 prepared by using diatoms as the biotemplate was significantly higher than the specific surface area of conventional TiO2/SiO2, which might be due to the formation of many accessible pores and channels [28].…”