Removal of Copper and Lead From Aqueous Solution by Tartaric Acid Modified Rice Husk
The potential of rice husk (RH) modified with various carboxylic acids to remove Cu(n) from aqueous solution was investigated. It was found that the sorption capacity of rice husk was enhanced by this modification. Tartaric acid modified rice husk (TARH) has the highest sorption capacity for Cu(I...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2001
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9317/1/FSAS_2001_50.pdf |
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| Summary: | The potential of rice husk (RH) modified with various carboxylic acids to remove
Cu(n) from aqueous solution was investigated. It was found that the sorption
capacity of rice husk was enhanced by this modification. Tartaric acid modified rice
husk (TARH) has the highest sorption capacity for Cu(II). TARH was produced by
treating RH with 1.2 M tartaric acid and heated at 180°C for 10 minutes.
In order to understand the sorption characteristics of Cu(II) and Pb(II) by TARH,
batch and column studies were performed under various experimental conditions.
The parameters studied were pH, temperature, contact time, initial concentration of
metal solutions, presence of competitive cations and chelators, sorbent dosage, rate of
agitation, particle size of sorbent, bed height, flow rate and sorption-desorption cycles
using synthetic solution and semiconductor electroplating wastewater. The results of batch studies indicated that the sorption process was pH dependent and
exothermic. Kinetic study showed that uptake of Cu(II) and Pb(II) reached
equilibrium after 60 minutes. The maximum binding capacities of the TARH at room
temperature determined from the Langmuir isotherms were 31.85 and 120.48 mg/g
for Cu(II) and Pb(II), respectively. In the presence of competitive cations and
chelators, metal uptake decreased. The affinity of TARH for Pb(II) was greater than
Cu(II) on a weight basis. The uptake increased with increasing sorbent dosage and
agitation rate.
The results of column studies showed that the utilised capacities of TARH at different
bed depths agreed closely with the maximum sorption capacities obtained from
Langmuir isotherm for both Cu(II) and Pb(II). The results also showed that
breakthrough depended on bed depth, initial influent concentration of metal ion and
flow rate. However, the effect of flow rate on sorption was minimal. The
relationship between service time and bed depth was linear. Predicted breakthrough
curves obtained from a two parameter mathematical model for Cu(II) and Pb(II) in
wastewater agreed well with experimental values.
In sorption-desorption study, Cu(II) and Pb(II) could be removed almost
quantitatively by eluting with a 0.1M HCI solution and the column could be used
repeatedly for at least 5 cycles in the treatment of wastewater. |
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