Optimization of an adsorption process for tetrafluoroborate removal by zirconium (IV)-loaded orange waste gel from aqueous solution.
This investigation provides new insights into the effective removal of tetrafluoroborate (BF4-) by means of bio-sorption on waste generated in the orange juice industry. It was undertaken to evaluate the feasibility of zirconium (IV)-loaded saponified orange waste gel for BF4- removal from an aqueous solution. Batch adsorption experiments were carried out to study the influence of various factors such as pH, presence of competing anions, contact time, initial BF4- concentration and temperature on the adsorption of BF4-. The optimum BF4- removal was observed in the equilibrium pH region 2-3. The presence of coexisting anions showed no adverse effect on BF4- removal except SO4(2-). The equilibrium data at different temperatures were reasonably interpreted by the Langmuir adsorption isotherm and the maximum adsorption capacities were evaluated as 2.65, 3.28, 3.87 and 4.77 mmol g(-1) at 293, 298, 303 and 313 K, respectively. Thermodynamic parameters such as deltaGo, deltaHo and deltaSo indicated that the nature of BF4- adsorption is spontaneous and endothermic. The results obtained from this study demonstrate the potential usability of orange waste after juicing as a good BF4- selective adsorbent.
Department of Applied Chemistry, Saga University, Saga, Japan.
Bimala
B
Pangeni
Hari
H
Paudyal
Katsutoshi
K
Inoue
Hidetaka
H
Kawakita
Keisuke
K
Ohto
Hiroyuki
H
Harada
Biplob Kumar
BK
Biswas
Shafiq
S
Alam
D000327:Adsorption; D000838:Anions / Q000737:chemistry; D018533:Biomass; D001881:Borates; D001888:Boric Acids / Q000302:isolation & purification*; D032084:Citrus sinensis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D015040:Zirconium / Q000737:chemistry*
D000838:Anions; D001881:Borates; D001888:Boric Acids; D014874:Water Pollutants, Chemical; D015040:Zirconium; C098759:fluoroboric acid