Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

Abstract

The effi ciency of walnut, pistachio and hazelnut shells to remove three monochlorophenols (2-CP, 3-CP and 4-CP) from aqueous solutions has been investigated. To describe the kinetic data pseudo-fi rst and pseudo-second order models were used. The kinetics data were fi tted better into the pseudo-second order model with the coeffi cient of determination values greater than 0.99. The k 2 values increased in the order 4-CP < 3-CP < 2-CP. Sorption was also analyzed as a function of solution concentration at equilibrium. The experimental data received were found to be well described by the Freundlich isotherm equation. Effectiveness of chlorophenols removal from water on the walnut, pistachio and hazelnut shells was comparable. Individual differences in sorption of monochlorophenols were also negligible.

Nutshells as modifiers of carbon paste electrodes used in detecting chloroorganic water pollutants

“…The specific surface areas for hazelnut and walnut shells were 8.5 and 7.1 m 2 /g, respectively. These values are low but comparable with the results reported by other authors (Kuśmierek and Świątkowski 2015a;Şencan et al 2015;Tang et al 2017). For example the SBET of the hazelnut shells was 5.92 m 2 /g (Şencan et al 2015) and the surface area of the walnut shells ranged from 1.01 to 3.12 m 2 /g (Tang et al 2017).…”

“…For example the SBET of the hazelnut shells was 5.92 m 2 /g (Şencan et al 2015) and the surface area of the walnut shells ranged from 1.01 to 3.12 m 2 /g (Tang et al 2017). Information on the physicochemical properties of the materials used was presented by Kuśmierek and Świątkowski (2015a). In order to better examine the surface of the hazelnuts and walnuts shells, the water vapor adsorption isotherms were determined (Fig.…”

Removal Of 2,4,6-Trichlorophenol From Aqueous Solutions Using Agricultural Waste As Low-Cost Adsorbents

“…The C curves (linear curves) are given by solutes which penetrate into the solid more readily than does the solvent. A similar isotherm shape was observed for sorption of monochlorophenols on nut shells [11] as well as TCP on peat [15], fruit cuticles [16] and potato tuber peryderm [17]. Several isotherm models are often used to interpret the equilibrium data [17].…”

“…Peanut shells were already effectively used as an adsorbent for dye [9] and heavy metals [10]. Walnut shells were used as sorbents for the removal of monochlorophenols [11], sulfamethoxazole [12], malachite green [13] and heavy metal ions [2]. However, to the best of our knowledge, the removal of 2,4,6-TCP from aqueous solutions by these materials has not been reported in literature.…”

Use of the Walnut Shell (Juglans Regia) as a Sorption Material to Remove Pollutants From Natural and Waste Water

“…Многие отходы от переработки сельскохозяйственного сырья исследовались в качестве сорбционных материалов для удаления красителей из водных сред [14,[83][84][85]. Скорлупа грецкого ореха также исследовалась в качестве сорбционного материала различных красителей [51,[86][87][88][89][90][91][92][93]. Сведения о полученных результатах приведены в таблице 4.…”