Cr (VI) removal from aqueous solutions by fly ash and fly ash composite filter material: Factorial experimental design

Cerium oxide (CeO2) nanoparticles (NPs) were used for the removal of cadmium (II), lead (II) and chromium (VI) ions in single aqueous solutions and in solutions with mixtures of the three metals. The adsorption studies were carried out at pH 5 and 7 using a systematic factorial experimental design that considered the metal concentration from 1 mg l-1 to 10 mg l-1 and NP concentration from 0.064 g l-1 to 0.640 g l-1. The highest adsorption capacity was obtained in the removal of lead (II) (128.1 mg g-1), followed by cadmium (II) (93.4 <div> mg g-1) and finally chromium (VI) (34.4 mg g-1). Data were fitted to a polynomial function obtaining the best reduced models. The type of system (single, multi-component) did not affect sorption capacity, whilst pH affected the sorption of Cd and Cr, but not that of lead. CeO2 nanoparticles proved to be effective adsorbents in removing all three heavy metals in multi-component systems, which opens a new window for their use as sorbent materials in complex waters contaminated with mixtures of heavy metals.  </div>

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Removal of Pb(II) from Aqueous Solution Using Composite Filter Material Made of Fly Ash

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.33.700 ◽

2010 ◽

Vol 33 ◽

pp. 700-703

Author(s):

Hong Qin Xue ◽

Xiao Dong Liu ◽

Zhao Qian Jing ◽

Chen Zhao

Keyword(s):

Aqueous Solution ◽

Fly Ash ◽

Adsorption Process ◽

Filter Material ◽

Adsorption Sites ◽

Optimum Ph ◽

Initial Ph ◽

Composite Filter ◽

Ph Range ◽

Optimum Ph Range

Adsorption of Pb(II) on composite filter material mainly made of fly ash was investigated for the removal of Pb(II) from aqueous solution. Batch experiments have been carried out for adsorption of Pb(II) on to this composite filter material. The effects of various parameters influencing the Pb(II) adsorption such as contact time, initial pH, different dosage of adsorbent and temperature have been studied. Results showed that adsorption equilibrium attained within 60 minutes time. Increase in adsorbent dosage led to increase in Pb(II) adsorption due to increased number of adsorption sites. Adsorption process was found to be highly pH dependent, and the optimum pH range for adsorption of Pb(II) was found to be >8.5. The sorption of Pb(II) increased with rise of temperature.

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Adsorption of Nickel(II) with Composite Filter Material Made of Coal Fly Ash

2009 International Conference on Energy and Environment Technology ◽

10.1109/iceet.2009.467 ◽

2009 ◽

Author(s):

Zhaoqian Jing ◽

Zheng Wang ◽

Hongqin Xue ◽

Shaohua Lin

Keyword(s):

Fly Ash ◽

Coal Fly Ash ◽

Filter Material ◽

Composite Filter

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Phosphate removal from water by fly ash: Factorial experimental design

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2005.11.036 ◽

2006 ◽

Vol 135 (1-3) ◽

pp. 165-170 ◽

Cited By ~ 47

Author(s):

M CAN ◽

E YILDIZ

Keyword(s):

Fly Ash ◽

Experimental Design ◽

Phosphate Removal ◽

Factorial Experimental Design

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Identifying suboptimalities with factorial model comparison

Behavioral and Brain Sciences ◽

10.1017/s0140525x18001541 ◽

2018 ◽

Vol 41 ◽

Cited By ~ 2

Author(s):

Wei Ji Ma

Keyword(s):

Experimental Design ◽

Model Comparison ◽

Process Models ◽

Multiple Forms ◽

Factorial Experimental Design ◽

Factorial Model ◽

Multiple Components ◽

The Many

AbstractGiven the many types of suboptimality in perception, I ask how one should test for multiple forms of suboptimality at the same time – or, more generally, how one should compare process models that can differ in any or all of the multiple components. In analogy to factorial experimental design, I advocate for factorial model comparison.

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