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Removal and Recovery of Chromium(III) from Aqueous Solutions by a Spheroidal Cellulose Adsorbent
Author(s) -
Liu Minghua,
Zhang Hong,
Zhang Xinshen,
Deng Yun,
Liu Weiguo,
Zhan Huaiyu
Publication year - 2001
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143001x139344
Subject(s) - adsorption , chemistry , aqueous solution , desorption , freundlich equation , ion exchange , hydrochloric acid , chromium , inorganic chemistry , cellulose , endothermic process , sodium hydroxide , langmuir , sorption , enthalpy , nuclear chemistry , ion , organic chemistry , physics , quantum mechanics
The removal and recovery of chromium(III) (Cr 3+ ) from aqueous solutions with a spheroidal cellulose adsorbent containing the carboxyl anionic group was investigated. The adsorption of Cr 3+ ion on the adsorbent has been found to be time, concentration, pH, and temperature dependent. The adsorption process follows both the Freundlich and Langmuir adsorption isotherms, and has been found to be endothermic (enthalpy change, Δ H = 31.35 kJ/mol). The Cr 3+ ion adsorbed on the adsorbent can be recovered by treating with a sodium hydroxide (NaOH) or hydrochloric acid (HCl) solution in one of two methods, static desorption or mobile desorption (column operation). A 1.2 mol/L HCl aqueous solution was finally chosen to recover the Cr 3+ ion using column operation. The recovery percentage is approximately 85.2%. The exhausted column can be chemically regenerated by treatment with 1 mol/L NaOH aqueous solution and no dismantling is required. The adsorption mechanism is explained on the basis of complexation and ion exchange, between which the complexation adsorption is predominant.