Adsorption of Cr (VI) Oxyanions onto Modified Wood Pulp

Abstract

A new adsorbent was prepared from wood pulp (WP) after reaction with epichlorohydrin and dimethylamine in the presence of pyridine and N,N-dimethylformamide (DMF). The adsorption of Cr (VI) from aqueous solutions by the so-prepared wood pulp adsorbent (WP-A) was investigated. Various factors affecting adsorption, such as pH, adsorbent concentration (1-5 g=L), agitation time (5-60 min), and Cr (VI) concentration (50-700), were taken into consideration. The adsorption of Cr (VI) onto (WP-A) was found to be pH-dependent and maximum adsorption was obtained at pH 3. The adsorption data obeyed Langmuir and Freundlich adsorption isotherms. The Langmuir adsorption capacity (Q max ) was found to be 588.24 mg/g. Freundlich constants, K F and n, were found to be 55.03 and 2.835, respectively.

Heavy metal adsorption onto agro-based waste materials: A review

“…More recently, great effort has been contributed to develop new adsorbents and improve existing adsorbents. Many investigators have studied the feasibility of using low-cost agro-based waste materials [21][22][23][24][25][26][27][28][29].…”

Biomass Adsorbent for Removal of Toxic Metal Ions From Electroplating Industry Wastewater

“…More recently, great effort has been contributed to develop new adsorbents and improve existing adsorbents. Many investigators have studied the feasibility of using lowcost agro-based waste materials (Hashem, 2006;, Abdel-Halim et al, 2006 Agricultural by-products usually are composed of lignin and cellulose as major constituents and may also include other polar functional groups of lignin, which includes alcohols, aldehydes, ketones, carboxylic, phenolic and ether groups. These groups have the ability to some extent to bind heavy metals by donation of an electron pair from these groups to form complexes with the metal ions in solution (Pagnanelli, 2003).…”

Removal of heavy metals from their aqueous solutions through adsorption onto natural polymers

“…Activated carbons (Amin, 2009;Kadirvelu, Thamaraiselvi, & Namasivayam, 2001), zeolites (Sohrabnezhad & Pourahmad, 2010;Wang, Li, Wang, Sun, & Huang, 2009), clays (Anirudhan, Bringle, & Rijith, 2010;Potgieter, Potgieter-Vermaak, & Kalibantonga, 2006), silica beads (de la Rosa, Gardea-Torresdey, PeraltaVidea, Herrera, & Contreras, 2003;Huang, Liao, & Shi, 2010), industrial by-products (Abdel-Halim, Abou-Okeil, & Hashem, 2006;Hashem, Abdel-Halim, El-Tahlawy, & Hebeish, 2005;Hashem, Abdel-Halim, Maauof, Ramadan, & Abo-Okeil, 2007), agricultural wastes (Demirbas, 2008;Hashem, Sokkar, AbdelHalim, & Gamal, 2005;Sud, Mahajan, & Kaur, 2008), biomass (Chu & Chen, 2002;Lesmana, Febriana, Soetaredjo, Sunarso, & Ismadji, 2009;Pengthamkeerati, Satapanajaru, Chatsatapattayakul, Chairattanamanokorn, & Sananwai, 2010), and polymeric materials (Liu, Ma, Xu, & Shao, 2010;Uguzdogan, Denkbaş , Öztürk, Tuncel, & Kabasakal, 2009) are examples for different adsorbents. Recently numerous approaches have been studied for the development of cheaper and more effective adsorbents containing natural polymers.…”