Adsorptive removal of phosphate from aqueous solutions using activated carbon loaded with Fe(III) oxide

344

CARBON 50 (2012) 342– 345

element method. The residual thermal stresses of the composite

value, iron content and anion concentration. The adsorption

from a low-graphitization temperature or with low interface stiff-

capacities of phosphate ions at pH 3.0 were 98.39 mg/g for iron

ness are lower than those from a high-graphitization temperature

oxide/activated carbon composite and 78.90 mg/g for activated

or with high interface stiffness. The higher the cooling rate, the

carbon. The adsorptive isotherms for phosphate ions with acti-

higher the residual thermal stress.

vated carbon and the composite adsorbent all match the Freund-

[New Carbon Materials 2011;26(4):287–92]

lich model better than the Langmuir model. The adsorption kinetic data could be well described by the Lagergren pseudo-sec-

doi:10.1016/j.carbon.2011.08.028

ond-order kinetic equation. The adsorption by the composite adsorbent is endothermic for phosphate ions. [New Carbon Materials 2011;26(4):299–306]

Synthesis of ordered mesoporous carbons by non-aqueous solvent evaporation method a

a

c

a

doi:10.1016/j.carbon.2011.08.030

b

Tie-hu Li , Xiao-xian Wang , Yong-bin Ji , Wei Jin , Qi-lang Lin a

School of Materials Science, Northwestern Polytechnical University,

Xi’an 710072, China b

School of Materials Science, Fuzhou University, Fuzhou 350002, China

c

Northwest Institute of Non-Ferrous Metal Research, Xian 710016, China Ordered mesoporous carbons (OMCs) with well-developed

mesopores were synthesized using evaporation-induced selfassembly (EISA). The triblock copolymer P123/phenol-resin/silica composites were prepared by EISA using tetraethyl orthosilicate

The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance Xin Geng a,b, Feng Li b, Da-wei Wang b, Hui-ming Cheng b a

University of Science and Technology Liaoning, School of Chemical

Engineering, Applied Chemistry Department, Anshan 114015, China b

Shenyang National Laboratory for Materials Science, Institute of Metal

Research, Chinese Academy of Sciences, Shenyang 110016, China

as the inorganic source, P123 as the structure directing agent and phenol-resin as the carbon source. OMCs were obtained by

Activated carbon was prepared from petroleum coke by chem-

the carbonization of the composites, followed by the removal of

ical activation. Multi-walled carbon nanotubes (MWCNTs) were

the silica template with a 10 wt% HF aqueous solution. For com-

mixed with the activated carbon to form the electrode material of

parison, another OMC was synthesized by using ordered silica

electric double layer capacitors. According to the relative values

as a hard template and impregnated sucrose as the carbon pre-

of impedance and capacitance in electrochemical impedance, the

cursor. The samples were characterized by scanning and trans-

available capacitance and energy dissipation from resistance were

mission electron microscopy and N2 sorption. Results indicated

evaluated. Results showed that the real part of the capacitance for

that the OMCs had an ordered hexagonal structure with a narrow

this mixture was higher than for activated carbon alone when acti-

distribution of mesopores. The optimized OMC was obtained

vated carbon was mixed with a mass fraction 3–15% MWCNTs.

using a P123/phenol-resin mass ratio of 1:0.25. Compared with

With the increase of MWCNT content, the imaginary part of the

the OMCs synthesized by the hard template method, the new

capacitance and its percentage decreases while the real part of

OMCs had fewer micro- and macropores.

capacitance and its percentage increases. It was revealed that the

[New Carbon Materials 2011;26(4):293–8]

efficiency of energy storage was improved, the relaxation time constant was decreased, the characteristic of capacitance response

doi:10.1016/j.carbon.2011.08.029

versus frequency was improved and the electrode resistance was decreased by the addition of MWCNTs to activated carbon. [New Carbon Materials 2011;26(4):307–12]

Adsorptive removal of phosphate from aqueous solutions using activated carbon loaded with Fe(III) oxide

doi:10.1016/j.carbon.2011.08.031

Zhong-liang Shi, Fu-mei Liu, Shu-hua Yao School of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China An composite adsorbent for the removal of phosphate from aqueous solutions was synthesized by loading iron oxide onto activated carbon. The adsorbent can be separated from the medium by a simple magnetic procedure owing to the magnetic properties of the iron oxides. The properties of the composite were investigated by nitrogen adsorption, scanning electron micros-

Effect of microwave-treatment time on the properties of activated carbons for electrochemical capacitors Xiao-jun He a, Ting Wang a, Jie-shan Qiu b, Xiao-yong Zhang a, Xiao-ting Wang a, Ming-dong Zheng a a

School of Chemistry and Chemical Engineering, Anhui Key Laboratory

of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China b

Carbon Research Laboratory, State Key Lab of Fine Chemicals, School of

copy and X-ray diffraction. The adsorption of phosphate ions by

Chemical Engineering, Dalian University of Technology, Dalian 116024,

the composite adsorbent and the activated carbon was compared

China

in batch experiments. The composite adsorbent showed fast adsorption rates and high adsorption capacities and its adsorp-

Activated carbons (ACs) made from petroleum coke by KOH

tive performance for phosphate ions was dependent on the pH

activation were further treated by microwaves to investigate the