Modified coconut shell fibers: A green and economical sorbent for the removal of anions from aqueous solutions

Nitrate sorption by modified Lagenaria vulgaris biomass: Kinetic and equilibrium studies

“…Pritom se može pretpostaviti da je vezivanje nitrata uglavnom bazirano na fizičkoj sorpciji (međumolekulska privlačenja, vodonične veze). Dobijeni rezultati su u skladu sa rezultatima sličnih istraživanja vezanih za sorpciju nitrata pomoću različitih modifikovanih biomasa [35,36].…”

Agricultural By-Products for Phosphorous Removal and Recovery from Water and Wastewater: A Green Technology

“…Particularly, the complete loss of the adsorption capacity of modified coconut shell fibers was recorded after the second cycle of reuse. This could be ascribed to the physical ruin of the biosorbent (De Lima et al 2012). Xu et al (2011c) revealed a weight loss of 12−18% as a result of using HCl 1 M as a desorbent.…”

“…Based on the effect of pH, Anirudhan et al (2006) concluded that in the pH range of 5.0−7.0, the removal of P by quaternized banana stem could mainly be attributed to ion exchange between Cl -of quaternary mine group and HPO4 2-/ H2PO4 -in the solution as follows: Xu et al (2011a) proposed that the ion exchange could be an important pathway for the remediating P by modified giant reed. The replacement of chloride ions in the amine groups of quaternized giant reed by phosphate ions in the solution could occur as follows: De Lima et al (2012) suggested that the modification of coconut shell fibers with ammonium quaternary salt led to the integration of −NH2 groups into the material. Consequently, the removal of P by quaternized coconut shell fibers occurred mainly via electrostatic interactions between −NH2 groups and PO4 3-anions.…”

“…Various quaternizing reagents have been tested for this purpose, e.g. dimethylamine (Anirudhan et al 2006); urea (Benyoucef and Amrani 2011;Karachalios 2012); 2-hidroxypropyltrimethyl ammonium chloride (De Lima et al 2012); polyallylamine hydrochloride ); trimethylammoniumchloride (Marshall and Wartelle 2004;Wartelle and Marshall 2006); ethylenediamine & triethylamine Yue et al 2010;Xu et al 2011a), etc. In most cases, quaternized AWBs exhibited the enhanced adsorption capacities for PO4 3-as compared to raw AWBs.…”

Adsorption of 5.5’-Disulfonicindigotin (5.5’-DI) onto Green Coconut Fiber (<i>Cocos nucifera</i> L.): Kinetic and Isotherms

“…Approximately 60 million tons of coconut (Cocos nucifera L.) were produced worldwide in 2010: 85% in Asia, 8.5% in the Americas, 2.9% in Africa and 3.2% in Oceania [2] [3]. The whole coconut tree may be used, but the main products are obtained from the fruit such as copra and oil, coconut milk, lauric acid, fiber, flour and coconut water (from immature fruit).…”