Biomass waste-derived activated carbon for the removal of arsenic and manganese ions from aqueous solutions

Abstract

The goal of this study was to investigate the preparation of low-cost activated carbons from bean pods waste and to explore their potential application to the removal of heavy metals from aqueous solutions. Conventional physical (water vapor) activation was used for synthesizing the adsorbent. The obtained carbon was employed for the removal of As (III) and Mn (II) from aqueous solutions at different initial concentrations and pH values. Adsorption for both ions follows Langmuir-type isotherm, the maximum loading capacities for arsenic (III) and Mn (II) ions being 1.01 and 23.4 mg g-1 , respectively. According to the experimental data, it can be inferred that the basic character of the surface, i.e. the high content of basic groups favors adsorption of ions. Arsenic adsorption capacity on the carbon obtained from agricultural waste was found to be similar to more expensive commercial carbons showing high adsorption capability. As regards manganese adsorption, herein obtained carbon presented higher uptake than that of activated carbons reported in the literature.

Adsorption Characteristics of Bisphenol A onto Low-Cost Modified Phyto-Waste Material in Aqueous Solution

“…The pH values of the solution play the important role in the adsorption process (Budinova et al 2009). Fluctuations in pH can affect the states of the ionic species in solution.…”

Coagulation of methylated arsenic from drinking water: Influence of methyl substitution

“…Previous research demonstrated that PAC was effective at enhancing As(V) removal [45], and high content of basic groups of PAC might favor adsorption of As [46]. In the present study, commercial PAC was used to adsorb DMA, followed by coagulation.…”

Active carbons from waste biochars

“…During treatment at about 350-700°C, besides biochar, some highly energetic liquid and gas products (oil being a mixture of liquid hydrocarbons and synthetic gas being a mixture of gas hydrocarbons) are formed. Proportions of the pyrolysis products depend on the kind of initial material and process conditions: range and rate of changes of temperature, time, pressure, and atmosphere [14][15][16][17][18][19][20][21][22][23]. The choice of pyrolysis parameters affects productivity and quality of the obtained biochar.…”