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Biosorption of lead (ii) ions by stem of manihot esculenta (cassava stem)

Biosorption of lead (ii) ions by stem of manihot esculenta (cassava stem) / Sathiswaran Selvam
Logam berat menjadi bahan pencemar kerana ciri-ciri ketidakbolehan biodegradasi, keracunan dan ketekunan dalam persekitaran di mana plumbum adalah salah satu daripadanya. Dalam kajian ini, biojisim batang Manihot esculenta telah digunakan dalam proses penjerapan plumbum (II) ion dalam kelompok. Kesan rawatan awal (mentah, asid dan alkali), kawalan pH (2-6), muatan biojisim (0.25 g - 1.25 g), masa sentuhan (20 minit – 100 minit) dan kepekatan logam awal (50 mg / L - 250mg / L). Pemerhatian menyatakan bahawa persekitaran yang sesuai untuk kapasiti penjerapan yang tinggi, iaitu penyingkiran sebanyak 99.60% oleh batang M. esculenta ialah seperti penjerap yang telah dirawatan awal menggunakan alkali, pada pH 6, muatan biojisim sebanyak 0.75 g, kepekatan logam sebanyak 100 mg/L, dalam 60 minit masa sentuhan. Ia juga mendapati bahawa model isoterma Langmuir (R2 = 0.9783) bersesuaian untuk proses biopenjerapan ini sebagai isoterma penjerapan, bukannya model isoterma Freundlich (R2 = 0.7581). Pemodelan data kinetik menunjukkan penyesuaian yang lebih baik bagi model baik dengan model kinetic ‘pseudo-second-order’ (R2 = 1.000) berbanding model ‘pseudo-first-order’ (R2 = 0.6244). Keputusan keseluruhan menunjukkan bahawa batang M. esculenta adalah biopenjerap yang baik, dan boleh digunakan sebagai biopenjerap kos rendah alternatif untuk penyingkiran ion plumbum (II). _______________________________________________________________________________________________________ Heavy metals becoming pollutants due to its non-biodegradable characteristics, toxicity and persistence in the environment where lead is one of it. In this study, Manihot esculenta stem biomass was used in the biosorption process of lead (II) ions in batch. The effects of pretreatment (raw, acid and alkali), pH control (2-6), biomass loading (0.25 g – 1.25 g), contact time (20 minutes – 100 minutes) and initial metal concentration (50 mg/L – 250mg/L) were studied on the removal of lead (II) ions from aqueous solution. Observations stated that the suitable conditions for high biosorption capacity, which is removal up to 99.60% by M. esculenta stem are alkali pretreated biosorbent, at pH 6, biomass loading of 0.75 g, metal concentration of 100 mg/L, in 60 minutes contact time. It is also found that Langmuir isotherm model (R2= 0.9783) fits well for this biosorption process as adsorption isotherm, rather than Freundlich isotherm model (R2= 0.7581). Kinetic data modelling resulted in good fit with the pseudo-second-order model (R2= 1.000) compared to pseudo-first-order model (R2= 0.6244). Overall result shows that M. esculenta stem is a good biosorbent, and can be used as an alternative low-cost biosorbent for removal of lead (II) ions.
Contributor(s):
Sathiswaran Selvam - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875007311
Barcode : 00003107191
Language:
English
Subject Keywords:
Heavy metals; non-biodegradable characteristics; alternative low-cost biosorbent
First presented to the public:
6/1/2017
Original Publication Date:
4/24/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 81
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-04-24 17:26:38.279
Date Last Updated
2020-04-26 11:18:59.884
Submitter:
Mohd Jasnizam Mohd Salleh

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Biosorption of lead (ii) ions by stem of manihot esculenta (cassava stem)1 2018-04-24 17:26:38.279