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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 8, 2015, pp. 2723-2730
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Bioline Code: st15255
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 8, 2015, pp. 2723-2730
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Evaluation of N-terminated siloxanes grafted onto lignocellulose as adsorbent for the removal of phenol red from water
Vala, R. M. K.; Tichagwa, L. & Dikio, E. D.
Abstract
This study reports the chemical modification of
lignocellulose (from Kikuyu grass) with N-terminated
siloxanes and its utilisation as adsorbent for the removal of
phenol red from aqueous media. The stability of the bond
between lignocellulose and siloxane was assessed after
Soxhlet extraction of unreacted siloxanes in tetrahydrofuran
for 5 h, as well as soaking the materials in water for
24 h. Adsorption tests showed the prepared materials to be
good candidate for the removal of phenol red (dye) from
water, with adsorption capacity from 1.454 to 3.312 mg of
phenol red adsorbed per gram of adsorbent. The kinetics of
adsorption was found to follow a pseudo-second-order
equation indicating chemisorption rather than simple forces
of association. The linearised form of adsorption isotherms
matched with the Langmuir model.
Keywords
Lignocellulose; N-terminated siloxane; Chemical modification; Phenol red; Adsorption; Kinetics; Isotherms
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