Identification of Stability, Kinetics, and Thermodynamic Parameters in Biosorption of NickelII Ions

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Identification of Stability, Kinetics, and
Thermodynamic Parameters in Biosorption of
Nickel(II) Ions to Enteromorpha prolifera

• M. Görkem GÜRBÜZ
• REPUBLIC OF TURKEY MINISTRY OF INDUSTRY AND TRADE
• SMALL AND MEDIUM INDUSTRY DEVELOPMENT
  ORGANISATION (KOSGEB) / TURKEY

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1. Purpose of the study

• Based on the literature research on
  biosorption, as an alternative to the biosorbents
  in those studies conducted, this study aims the
  release of the nickel(II), which is found in
  industrial wastes in quite considerable amounts,
  into Enteromorpha prolifera on the Mediterranean
  coast.
• Identification of the most appropriate ambient
  conditions
• Identification of the most appropriate stability
  model
• Identification of the most appropriate kinetics
  model
• Identification of thermodynamic parameters
• 2. Biosorption
• Biosorption is the process of adsorption, in
  which thermally or chemically inactivated
  biomasses are used.
• Fast and efficient removal of metal,
  Recyclable waste
• Simple operating conditions,
  High capacity of operation
• Removal in a short period of time,
  Mathematically identifiable system
• Desorbable and recyclable metal,
  Economic

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3. MATERIAL AND METHOD

• A) Material
• Micro organism
• Enteromorpha prolifera of green algae,
  which was used in the studies, was collected on
  the Mediterranean coast in Davultepe Municipality
  in Mersin.
• Chemical substances
• The chemical substances used in the studies
  were the products of the companies Merck and
  Sigma. Chemicals used were
• - HCl - Sodium diethyl
  ditiocarbomate - NiCl2
• - NH3 - NaOH
• B) Method
• Preparation of micro organisms for
  biosorption studies
• Algae collected from the wild were cleaned by
  supply water, and then by pure water one or more
  times, and dried at 100 C for 8 hours.
• Preparation of heavy metal (Nickel(II)) stock
  solutions
• Ni2 stock solution of 1 g/L used in the
  study was prepared by NiCl2 and pure water.
• Nickel solutions were used in the studies after
  having had the required dilutions from stock

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3. Material and Method (Continued)
C) Test System
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4. Findings and Discussion
4.1 Identification of the most appropriate
ambient conditions for nickel(II) ion
pH 5

• Figure 4.1. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, the impact of initial pH
  on the nickel(II) ion amount biosorbed per
  stabilised unit biosorbent of nickel (II) ions
  (Conditions Co 100 mg/L pH 2,3,4,5 Xo 1
  g/L T30 oC KH100 rpm)

• Figure 4.2. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, the impact on the
  nickel(II) ion amount biosorbed per unit
  biosorbent at different initial temperatures
  (Conditions Co 100 mg/L pH 4 Xo 1 g/L
  KH100 rpm)

pH qd
T 30 oC qdmax Tgt 30 oC qd
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4. Findings and Discussion
4.2 Identification of the most appropriate
ambient conditions for nickel(II) ion (continued)

• Figure 4.4. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, nickel(II) ion amount
  biosorbed at different mixing speeds (Conditions
  Co 100 mg/L pH 5 T30 C Xo 1 g/L)

• Figure 4.3. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, exchange of nickel(II)
  ion amount biosorbed per unit biosorbent with
  biosorbent concentration at different initial
  biosorbent concentrations (Conditions Co 100
  mg/L pH 5 T30 C KH100 rpm)

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4. Findings and Discussion
4.3 Stabilisation modelling for nickel(II) ion
Freundlich Isotherm Model

• Figure 4.5. Experimental and theoretical
  isotherms for biosorption of nickel(II) ions to
  Enteromorpha prolifera (Conditions pH 5 T30
  oC KH100 rpm)

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4. Findings and Discussion
4.4 Kinetics studies of nickel(II) ion
dq ?
k2.ad (qden q)2
dt

• Figure 4.6. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, pseudo second degree
  kinetics model graphic obtained at different
  nickel(II) ion concentrations (Conditions pH 5
  Xo1 g/L T 30 C KH100 rpm)

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7. Findings and Discussion
4.5. Calculation of activation energy for
nickel(II) ion
EA 5,83 kJ/mol
Inclination EA Breakpoint ko

• Figure 7.7. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, the activation energy
  graphic for the temperature range of 20 C - 30 C
  (Conditions pH 5 Co100 mg/L, Xo 1 g/L
  KH100 rpm)

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7. Findings and Discussion
4.6. Calculation of thermodynamic parameters for
nickel(II) ion
?So ? ?Ho 1 (ln Kc)
????? ?? R
T
Inclination ?Ho Breakpoint ?So
?Go ?Ho (T?So)

• Figure 4.8. For biosorption of nickel(II) ions to
  Enteromorpha prolifera, Vant Hoff graphic for
  the temperature range of 20 C - 30 C

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5. CONCLUSIONS