Abstract
Water pollution, from industry and agriculture, is a major threat to water security in the light of decreasing global potable water resources. Adsorption is one potential treatment technology for the removal of different contaminants from polluted water. Hard lignocellulose-containing materials with high carbon content, such as date stones, are excellent precursors for the production of activated carbons for adsorption activities. In this study, waste date stone biomass, from the seedless date products industry, was treated and activated chemically for the adsorption of malachite green dye, which is widely used in the plastics and textile industries. Phosphoric acid was used as an activating agent for the date stones, and its adsorption capability was measured and compared to the capacity of natural date stone powder. Experimental equilibrium data were analysed and correlated by four isotherm models: Langmuir, Freundlich, Temkin and Langmuir–Freundlich (also called SIPS). The best fit for the experimental data for both treated and natural date stone was the Langmuir–Freundlich isotherm. The surface areas and maximum malachite green adsorption capacities of the natural date stone and the phosphoric acid–treated date stone were 86 and 909 m2/g, respectively, and maximum malachite green adsorption capacities were 31.5 and 64.7 mg/g, respectively. A two-stage batch adsorber model was developed to optimize the two-step adsorption process to remove malachite green and minimize the amount of adsorbent used for both untreated and treated date stones. The benefits of the two-stage adsorber and chemically activated date stones are discussed in terms of designing for various percentages dye removal, various effluent discharge concentrations and various initial dye concentrations. The two-stage system resulted in a reduction of adsorbent compared with the one-stage system of 36 to 460% to remove the same amount of dye.
Highlights
Dyes are a common type of pollutant that are discharged into the aquatic ecosystems by industries such as paper, plastic, leather treatment and printing [1]
The results show a significant increase in the capacity of MG adsorption onto date stones after the phosphoric acid treatment
The results show a rough average of 36% reduction in the amount of date stones required to remove the same amount of MG in a two-stage system compared to a single-stage process
Summary
Dyes are a common type of pollutant that are discharged into the aquatic ecosystems by industries such as paper, plastic, leather treatment and printing [1]. Several studies report the use of biomass wastes to produce activated carbons in a number of applications, for example, apricot [21], bamboo [22], cherry stones [23], coconut shell [24] olive stones [25], peach stones [26], pine cone [27], plum stones [28], sugarcane bagasse [29, 30], rice husk and silk waste [31] This led to considering activated carbons as a universal adsorbent [32]. A two-batch adsorber optimisation model was adopted using the best fit isotherm to minimize the amount of adsorbent used for both natural and phosphoric acid– activated date stones
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