Novel micro-structured carbon-based adsorbents for notorious arsenic removal from wastewater

Abstract

The contamination of groundwater by arsenic (As) in Bangladesh is the biggest impairing of a population, with a large number of peoples affected. Specifically, groundwater of Gangetic Delta is alarmingly contaminated with arsenic. Similar, perilous circumstances exist in many other countries and consequently, there is a dire need to develop cost-effective decentralized filtration unit utilizing low-cost adsorbents for eliminating arsenic from water.Morphological synthesis of carbon with unique spherical, nanorod, and massive nanostructures were achieved by solvothermal method. Owing to their intrinsic adsorption properties and different nanostructures, these nanostructures were employed as adsorption

A Short Review on Catalyst, Feedstock, Modernised Process, Current State and Challenges on Biodiesel Production

“…Carbon-based acid catalysts have several distinct advantages, including lower cost, due to the fact that they may be made from low-value biomass waste and have a large surface area and porosity [213]. This was in agreement with Table 3 findings, whereby the majority of the biomass-based catalysts exhibited high surface area (~13.30 to 1411 m 2 /g) and large pore size [167,168,172,[213][214][215]. Indeed, most of these studies still used the method of chemical activation method using H 2 SO 4 , H 3 PO 4 , and KOH for improving the acidity and textural properties of the activated carbon catalyst, hence promoting the catalytic esterification and transesterification reaction (FAME yield: 44-97%).…”

“…Albuquerque et al (2008) reported similar results of conversion using KOH/Na-X, CaO/SBA-15 catalysts, with 85% conversion at the reaction temperature of 60 • C and 95% conversion at reaction temperature of 65 • C, respectively. However, similar to the CaO discussed earlier, a reduction in activity was observed over time due to leaching of the active species and/or blockage of the active site arising from adsorption of organic molecules [171,172].…”

The removal of toxic metals from liquid effluents by ion exchange resins. Part XVII: Arsenic(V)/H+/Dowex 1x8

“…The removal of arsenic(V) from waters, wastewaters, or generally speaking, aqueous solutions, is a topic of the utmost importance for the scientific community though there are few technologies proposed for this task (Alka et al, 2021;Weerasundara and Bundschuh, 2021). Some recent investigations describe the use of micro-structured carbon-based (Islam et al, 2021) and modified incinerated sewage sludge ash (Gao et al, 2021) adsorbents; ion exchange using various resins (Dadakhanov et al, 2021), resin-supported nano-hydrated zirconium oxide (Deng et al, 2021), and an electrochemical-ion exchange hybrid method (Rathi et al, 2021); various membrane processes (Moreira et al, 2021;Sherugar et al, 2021;Rojas-Challa et al, 2021;Jarma et al, 2021;Lopez et al, 2021); and solvent extraction using a Triton X nonionic surfactant-choline chloride ionic liquid-water mixture (Silva et al, 2021).…”

A novel CO2 activation at room temperature to prepare an engineered lanthanum-based adsorbent for a sustainable arsenic removal from water

“…The preparation of tailored adsorbents for the effective removal of water pollutants is a challenge of particular interest especially for geogenic elements highly toxic like arsenic (Zhang et al, 2007;Davidescu et al, 2011;Ciopec et al, 2013;Negrea et al, 2014;Islam et al, 2021;Lv et al, 2021). This metalloid is cataloged as a priority groundwater pollutant and is hazardous for human beings even at very low concentrations (Kumar et al, 2020).…”