Developing spherical activated carbons from polymeric resins for removal of contaminants from aqueous and organic streams

In recent years, there has been increased world-wide concern over residual (carry-over) activity of mostly high temperature (HT) and very high temperature (VHT) stable amylases in white, refined sugars from refineries to various food and end-user industries. HT and VHT stable amylases were developed for much larger markets than the sugar industry with harsher processing conditions. There is an urgent need in the sugar industry to be able to remove or inactivate residual, active amylases either in factory or refinery streams or both. A survey of refineries that used amylase and had activated carbon systems for decolorizing, revealed they did not have any customer complaints for residual amylase. The use of high performance activated carbons to remove residual amylase activity was investigated using a Phadebas® method created for the sugar industry to measure residual amylase in syrups. Ability to remove residual amylase protein was dependent on the surface area of the powdered activated carbons as well as mixing (retention) time. The activated carbon also had the additional benefit of removing color and insoluble starch.

Download Full-text

Adsorption/Desorption Performance of CO2 on Pitch-based Spherical Activated Carbons

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2011.00149 ◽

2011 ◽

Vol 26 (2) ◽

pp. 149-154 ◽

Cited By ~ 1

Author(s):

Fei XIE ◽

Yan Li WANG ◽

Liang ZHAN ◽

Ming GE ◽

Xiao-Yi LIANG ◽

...

Keyword(s):

Activated Carbons ◽

Adsorption Desorption

Download Full-text

Effect of Polyphosphate on Removal of Endocrine-Disrupting Chemicals of Nonylphenol and Bisphenol-A by Activated Carbons

Water Quality Research Journal ◽

10.2166/wqrj.2005.052 ◽

2005 ◽

Vol 40 (4) ◽

pp. 484-490 ◽

Cited By ~ 5

Author(s):

Keun J. Choi ◽

Sang G. Kim ◽

Chang W. Kim ◽

Seung H. Kim

Keyword(s):

Activated Carbon ◽

Bisphenol A ◽

Surface Charge ◽

Activated Carbons ◽

Endocrine Disrupting Chemicals ◽

Dipole Interaction ◽

High Affinity ◽

Calcium Polyphosphate ◽

Endocrine Disrupting ◽

Positively Charged

Abstract This study examined the effect of polyphosphate on removal of endocrine-disrupting chemicals (EDCs) such as nonylphenol and bisphenol-A by activated carbons. It was found that polyphosphate aided in the removal of nonylphenol and bisphenol- A. Polyphosphate reacted with nonylphenol, likely through dipole-dipole interaction, which then improved the nonylphenol removal. Calcium interfered with this reaction by causing competition. It was found that polyphosphate could accumulate on carbon while treating a river. The accumulated polyphosphate then aided nonylphenol removal. The extent of accumulation was dependent on the type of carbon. The accumulation occurred more extensively with the wood-based used carbon than with the coal-based used carbon due to the surface charge of the carbon. The negatively charged wood-based carbon attracted the positively charged calcium-polyphosphate complex more strongly than the uncharged coal-based carbon. The polyphosphate-coated activated carbon was also effective in nonylphenol removal. The effect was different depending on the type of carbon. Polyphosphate readily attached onto the wood-based carbon due to its high affinity for polyphosphate. The attached polyphosphate then improved the nonylphenol removal. However, the coating failed to attach polyphosphate onto the coal-based carbon. The nonylphenol removal performance of the coal-based carbon remained unchanged after the polyphosphate coating.

Download Full-text

Adsorption of CCl4 from Aqueous Solution on Activated Carbons

Adsorption Science & Technology ◽

10.1260/0263617001493846 ◽

2000 ◽

Vol 18 (9) ◽

pp. 823-837 ◽

Cited By ~ 12

Author(s):

Eugeniusz Milchert ◽

Waldemar Goc ◽

Robert Pelech

Keyword(s):

Aqueous Solution ◽

Activated Carbons

Download Full-text

Surface functionality and porosity of activated carbons obtained from chemical activation of wood

Carbon ◽

10.1016/s0008-6223(99)00134-7 ◽

2000 ◽

Vol 38 (5) ◽

pp. 669-674 ◽

Cited By ~ 152

Author(s):

H Benaddi ◽

T.J Bandosz ◽

J Jagiello ◽

J.A Schwarz ◽

J.N Rouzaud ◽

...

Keyword(s):

Activated Carbons ◽

Chemical Activation ◽

Surface Functionality

Download Full-text

1.8 V Aqueous Symmetric Carbon-Based Supercapacitors with Agarose-Bound Activated Carbons in an Acidic Electrolyte

Nanomaterials ◽

10.3390/nano11071731 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1731

Author(s):

Chih-Chung Lai ◽

Feng-Hao Hsu ◽

Su-Yang Hsu ◽

Ming-Jay Deng ◽

Kueih-Tzu Lu ◽

...

Keyword(s):

Activated Carbon ◽

Sulfuric Acid ◽

Energy Density ◽

Activated Carbons ◽

High Energy ◽

Aqueous Electrolytes ◽

Alternative Material ◽

Aqueous Cells ◽

Acidic Electrolyte ◽

Cycling Behavior

The specific energy of an aqueous carbon supercapacitor is generally small, resulting mainly from a narrow potential window of aqueous electrolytes. Here, we introduced agarose, an ecologically compatible polymer, as a novel binder to fabricate an activated carbon supercapacitor, enabling a wider potential window attributed to a high overpotential of the hydrogen-evolution reaction (HER) of agarose-bound activated carbons in sulfuric acid. Assembled symmetric aqueous cells can be galvanostatically cycled up to 1.8 V, attaining an enhanced energy density of 13.5 W h/kg (9.5 µW h/cm2) at 450 W/kg (315 µW/cm2). Furthermore, a great cycling behavior was obtained, with a 94.2% retention of capacitance after 10,000 cycles at 2 A/g. This work might guide the design of an alternative material for high-energy aqueous supercapacitors.

Download Full-text