Proceedings of the IConSSE FSM SWCU 2015, pp. BC.56–60 ISBN: 978-602-1047-21-7
SWUP
BC.56
Immobilization cocodust biomass with silica gel as adsorbent for CdII and PbII ions in solution
Tri Endah
1
, Buhani
2
, Suharso
3
1
SMAN 5 Metro, Jl. Wolter Monginsidi 22A Hadimulyo Metro 34111, Lampung, Indonesia
2,3
FMIPA Universitas Lampung, Jl. Brojonegoro No 1, Bandar Lampung 35145, Indonesia
Abstract
It has been studied cocodust immobilization with silika gel as adsorbent of heavy metal CdII and PbII ions in solution using batch metode. Adsorbent material
characterizations obtained were performed with using Scanning Electron Microscope SEM- Energy Dispersive X-ray Spectrophotometer EDS to observe surface morphology
of adsorbent and element composition existed in material resulted from immobilization. Analisys of adsorbent material functional group was carried out with using IR and
determination of CdII and PbII ions concentration was applied with using atomic adsorption spectrofotometer AAS. Adsorbent characterization result by infrared
spectrophotometer IR shows that functional group of OH, C=O, Si-O-Si, and C-H are exist on adsorbent. In addition, adsorbent characterizations by SEM-EDS proves the
existency of Si, O, and C element on adsorbent. Adsorption process of CdII and PbII ions is optimum at pH 6 with contact time of 60 minutes. Adsorption process of CdII
and PbII ions on cocodust biomass tends to follow second orde pseudo kinetic and Freundlich adsorption isoterm model with concentration of CdII and PbII ions
adsorbed each 17.91 and 23.64 mg g
-1
.
Keywords adsorption, cocodust, heavy metal, immobilization
1. Introduction
Heavy metals produced from the residue waste industry is one of the hazardous material is very disturbing life and the environment. Cadmium Cd and Lead Pb is a heavy
metal that is produced from industrial waste. Cd and Pb metals in the body cause neurological disorders. Cd and Pb metals in the body can not be removed but will accumulate
as chemically bonded. Threfore, be required to eliminate or decrease the concentration of heavy metals and reduce in the environment Buhani et al., 2010.
Currently there are several techniques that can be used to separate heavy metals from industrial waste, among other ion exchange, addition of alkoxy RO, chemical precipitation
and adsorption Riyahie et al., 2011; Selvaraj et al., 1997 . From some of these methods, the
method of adsorption is a technique that is widely used to reduce the concentration of metal so effective to minimize the entry of metals into the environment.
Cocodust have been used as adsorbent metal cocodust Ni
2+
and Zn
2+
Fatemeh et al., 2013, that is modified using acid solvent and neutralized with alkali. Cocodust have been
used adsorption CdII Essient et al., 2011.. Adorption of CdII from Aqueous Solution used carbon active from cocodust Kadirvelu Namasivayam, 2002.
Cocodust is lignocllulosic material, it has a combination of cellulose and hemicellulose such as lignin, and pectin which acts as a binder. Lignin is a compound that is easily degraded
by fungi such as Deuteromycetes, basidiomycetes and ascomycetes Hataka, 2001.
T. Endah, Buhani, Suharso
SWUP
BC.57
Therefore, in this research cocodust immobilization is done to improve stability of biomass cocodust with supporting matrix such as silica gel. The result is used as adsorbent to adsorb
CdII and PbII ions from solution.
2. Materials and methods
Manufacture adsorbent Cocodust obtained from the compound 22A Hadimulyo metro, Lampung. Cocodust
derived from coconut released from the husk taken, then the coconut coir dust cocodust collected obtained from coconut husk. Cocodust made into a homogeneous of the same size.
Cocodust cut using a cutter and sieved using Siever Fritsch with a size of 150-200 m, after thats washed using aquabidest 3 times. Then dried in an oven at 100ºC for 24 hours
Mehrasbi et al., 2009.
Immobilization of biomass cocodust Biomass cocodust in diameter 150-200 mfrom 22A Hadimulyo metro, Province
Lampung, Indonesia was chemically modified in two step. Firstly, cocodust was activated by silica gel from TEOS. Immobilized by silica gel used a procedure Buhani, 2010. The observe
surface morphology before and after immobilized using SEM analysis. Analysis of adsorbent material which interaction with metal ion, functional group was carried out using IR.
Adsorption process Adsorbat solution made of Cd NO
3
.4H
2
O and Pb NO
3 2
in a concentration of 1000 ppm as the mother liquor. Adsorption was performed using 20 mg of adsorbent and 50 mL
of ion CdII and PbII with a variation of pH between 2-10 stirred using a shaker at 100 rotasion min
-1
at a temperature of 25ºC. Kinetics adsorption was studied using first and pseudo second order on the variation of the contact time between 0-90 minutes. Variations
in the concentration of metal ions is used to determine the maximum absorption of between 0 -100 mg L
-1
. Isotherm adsorption Langmuir and Freundlich models can provide information absorption that occurs in the general adsorbent.
3. Results and discussion
