Removal of chromium (VI) from aqueous solution using treated oil palm fibre

Microwave incinerated sugarcane bagasse ash (MISCBA) as a low cost adsorbent for the removal of zinc in aqueous solution

“…Contact time of 180 mins is considered to be optimum in this study and maintained for subsequent studies. Similar result was obtained by (Isa et al [10]) in the adsorption of metal ions using low cost sorbent in aqueous solution. Effect of contact time on the adsorption of metal ion zinc (initial concentration= 100 mg/L, agitation speed = 150rpm, temperature = 27 ± 1°C, pH = 6.0 and adsorbent dosage = 5.0g/L).…”

Performance of durian shell waste as high capacity biosorbent for Cr(VI) removal from synthetic wastewater

“…Increasing pH will enhance the electrostatic repulsion forces between Cr(VI) anions and negatively charged biosorbent surface, thus the removal of Cr-metal ions will be limited. Similar tendency has also been noticed by other authors in the biosorption of Cr(VI) by various biosorbents (Ahalya et al, 2005;Park et al, 2005;Mohanty et al, 2006;Anjana et al, 2007;Das and Guha, 2007;Garg et al, 2007;Malkoc and Nuhoglu, 2007;Isa et al, 2008;Li et al, 2008).…”

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

“…The effect of contact time (t in min), adsorbent dose (sawdust in g), and initial concentrations of adsorbate (mg L -1 Cr(VI)) on the uptake of Cr(VI) were studied in triplicate batch experiments. The pH effect was also studied in the range of 1.2-3.4; the pH of the solutions was adjusted using H 2 SO 4 solution according to the guidelines of numerous researchers (Dean and Tobin 1999;Isa et al 2008); the H 2 SO 4 solution was 3.6 N with maximum volume 5 mL per 1 L of Cr(VI) solution. The predominant species at pH 2 is expected to be HCrO 4…”

“…Mostly untreated and pretreated lignocellulosic industrial byproducts and agricultural residues have been employed as adsorbents for hexavalent chromium removal from water. These materials include sawdust (Baral et al 2006;Aliabadi et al 2006;Vinodhini and Das 2010), coir pith (Sumathi et al 2005), oil palm fiber (Isa et al 2008), wheat straw carbon (Chand et al 2009), barley straw carbon (Chand et al 2009), leaf mould (Sharma and Forster, 1996), wheat bran (Nameni et al, 2008;Singh et al 2009), cotton stalk peel , maize tassel (Zvinowanda et al 2009), walnut shell (Pehlivan and Altun 2008), walnut hull ), hazelnut shell (Pehlivan and Altun 2008), almond shell (Pehlivan and Altun 2008), rice bran (Oliveira et al 2005), rice husk (Sumathi et al 2005), soybean hulls (Marshall and Wartelle 2004), eucalyptus bark (Sarin and Pant 2006), Tamarindus indica seeds (Agarwal et al 2006), tea factory waste (Vinodhini and Das 2010), spent mushroom modified by cationic surfactant (Jing et al 2011), and olive stone (Blázquez et al 2009). Furthermore, since lignocellulosic materials are used in the bioethanol industry as source of sugars (Mosier et al 2005), the process solid residue can be, also, implemented as adsorbent.…”