Kesetimbangan sorpsi ion seng(ii) pada partikel gambut
DOI:
https://doi.org/10.5614/jtki.2010.9.3.3Abstrak
Extensive exposure of zinc(II) ions may cause eminent health problems, such as stomach cramps, skin irritations, vomiting, anaemia, a damage of pancreas, the disturbance of protein metabolism, and also respiratory disorders. Due to these problems, zinc(II) concentration in drinking water should be controlled. Peat is one of the material that can be used to minimize zinc(II) ions from a solution. The study was done to determine the performance and sorption equilibrium of zinc ions onto oligothropic peat particles. The sorption experiments were conducted in a several batch reactor of erlenmeyer flask at a constant temperature of 26 ± 3 oC. The initial zinc ions concentration and pH were varied. Response variable was residual zinc concentration that was measured spectrophotometrically. Experimental data show that the optimum sorption efficiency was about 90% for the initial zinc(II) concentration of 50 mg/L. Sorption equilibrium can be represented by the Freundlich and Langmuir isotherm models. For the initial pH of 6, the optimum sorption capacity, qo was 3,736 mg/g, and the Freundlich’s characteristic  constant, Kf was about 0,342 L/g.  Â
Key words : peat, sorption equilibrium, sorption isotherm, zinc(II) ions
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Abstrak
Paparan ion seng(II) pada kadar tertentu dapat menyebabkan berbagai masalah kesehatan seperti kram perut, iritasi kulit, batuk, anemia, kerusakan pankreas, gangguan metabolisme protein, penyumbatan pembuluh darah, hingga kerusakan sistem pernafasan. Karena itu, seng(II) termasuk kategori unsur yang harus dibatasi konsentrasinya dalam air minum. Gambut adalah salah satu material yang dapat digunakan untuk mengurangi ion seng dari larutan. Penelitian ini bertujuan untuk mempelajari performansi dan kesetimbangan sorpsi ion seng(II) pada partikel gambut oligotropik Indonesia. Penelitian dilakukan secara batch di dalam sejumlah labu erlenmeyer pada temperatur konstan 26 ± 3 oC. Eksperimen dilakukan dalam beberapa variasi konsentrasi awal ion seng dan pH. Data primer adalah konsentrasi residual seng dalam larutan yang diukur secara spektrofotometrik. Hasil penelitian menunjukkan bahwa efisiensi optimum sorpsi mencapai lebih dari 90% untuk konsentrasi awal seng 50 mg/L. Kesetimbangan sorpsi logam seng(II) pada partikel gambut dapat direpresentasikan dengan baik oleh model isoterm Freundlich dan Langmuir. Untuk rentang pH awal 6, nilai kapasitas sorpsi optimum, qo adalah 3,736 mg/g, sedangkan nilai konstanta karakteristik Freundlich, Kf  adalah 0,342 L/g.Â
Kata kunci : efisiensi sorpsi, gambut, isoterm sorpsi, ion seng(II)
Referensi
Aho, M.; Tummavori, J., On The Ion Exchange Properties of Peat. Part IV: The Effect of Experimental Conditions on Ion Exchange of Sphagnum Peat, Suo, 1984, Vol. 35(2), 47-53.
Ajmal, M.; Rao, R.A.K.; Siddiqui, B.A., Studies on Removal and Recovery of Cr(IV) from Electroplating Waste, Water Research, 1996, Vol. 30(6), 1478-1482.
Akinbiyi, A., Removal of Lead from Aqueous Solutions by Adsorption Using Peat Moss, Master Thesis, University of Regina, Canada, 2000, 26-63.
APHA, Standard Methods for Examination of Water and Waste Water, 4th edition, American Public Health Association, Washington DC., 1998.
Bencheikh-Lehocine, M., Zinc removal using peat adsorption, Environmemtal Technology Letters, 1989, Vol. 10, 101-108.
Brown, P.A.; Gill, S.A; Allen, S.J., Metal removal from wastewater using peat, Water Research, 2000, Vol. 34(16), 3907-3916.
Brown, P.A., The Application of Peat and Lignite to The Removal of Heavy Metals from Industrial Wastewater, PhD. Dissertation, Queens University, Belfast, 1993.
Cimino, G.; Passerini, A.; Toscano, G., Removal of toxic cations and Cr(VI) from aqueous solution by hazelnut shell, Water Research, 2000, Vol. 34(11), 2955-2962.
Coupal, B.; Lalancette, J.M., The treatment of wastewater with peat moss, Water Research, 1976, Vol. 10, 1071-1076.
Gardea-Torresdey, J.L.; Tang, L.; Salvador, J.M., Copper Adsorption by Esterified and Unesterified Fraction of Sphagnum Peat Moss and Its Different Humic Substances, Journal of Hazardous Materials 1996, Vol. 48, 191-206.
Gosset, T.; Trancart, J.L.; Thevenot D.R., Batch metal removal by peat kinetics ad thermodynamics, Water Research, 1986, Vol. 20(1), 21-26.
Gharaibeh, S.H.; Abu-el-Sha’r, W.Y.; Al-Kofahi, M.M., Removal of selected heavy metal from aqueous solution using process solid residue of olive mill products, Water Research, 1998, Vol. 32(2), 498-502.
Hariyanto, S., Alternatif pemanfaatan gambut dalam penanganan limbah cair, Jurnal Kimia Lingkungan, 2001, Vol. 3(1), 53-59.
Ho, Y.S.; John Wase, D.A.; Forster, C.F., Batch nickel removal from aqueous solution by sphagnum moss peat, Water Research, 1995, Vol. 29(5), 1327-1332.
Ho, Y.S.; McKay, G., Sorption of copper(II) from aqueous solution by peat, Water, Air, and Soil Pollution, 2004, Vol. 158(1), 77-97.
Leslie, M.E., Peat: New medium for treating dye house effluent, American Dyestuff Reporter, 1974, Vol. 63(8), 15-18
