BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...

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Sorption (%) 100.0 80.0 60.0 40.0 20.0 0.0 10.0 20.0 50.0 100.0 biosorbent amount (mg) 200.0 Pb Cd Ni Figure 3.15. Effect of biosorbent amount on biosorption of Pb 2+ , Cd 2+ , and Ni 2+ by Oocystis sp. (10.0 mL solution of 250.0 mg/L, solution pH of 6.0, sorption time of 60 min, and different amounts of biomass) Sorption (%) 100.0 80.0 60.0 40.0 20.0 0.0 10.0 20.0 50.0 100.0 biosorbent amount (mg) 200.0 Pb Cd Ni Figure 3.16. Effect of biosorbent amount on biosorption of Pb 2+ , Cd 2+ , and Ni 2+ by Porphyridium cruentum (10.0 mL solution of 250.0 mg/L, solution pH of 6.0,sorption time of 60 min, and different amounts of biomass) Ni Cd Pb Ni Ni Ni Cd Cd Cd Pb 47
Sorption (%) 100.0 80.0 60.0 40.0 20.0 0.0 10.0 20.0 50.0 100.0 biosorbent amount (mg) 200.0 Pb Cd Ni Figure 3.17. Effect of biosorbent amount on biosorption of Pb 2+ , Cd 2+ , and Ni 2+ by Scenedesmus protuberans (10.0 mL solution of 250.0 mg/L, solution pH of 6.0, sorption time of 60 min, and different amounts of biomass) 3.3. Desorption Studies for Oocystis sp. and Scenedesmus protuberans For the evaluation of the efficiency and feasibility of a metal removal procees, the regeneration and reusability of the biosorbent should be considered. In addition to this, the recovery of the metals which has either an economical importance or a vital role in the environment should be emphasized. Hence, the desorption of metal ions bound on the biosorbent is applied to re-solubilise biosorbent-bound metals by suitable eluant or desorbing solution. Therefore, biosorbent can be utilized in multiple sorption – desorption cycles. A common example method for the desorption of heavy metal from the biomass is the treatment of biomass after sorption cycle in acidic pH. Increasing the acidity of the metal-loaded biosorbent suspension leads to separation of metal cations from biosorbent by protons from the binding sites (Mehta and Gaur 2005). Notwithstanding, at extremely low pH values, the biomass can be damaged. On the other hand, organic and mineral acids, bases, salts, and metal chelators have been studied for their ability on the desorption of metals (Kuyucak and Volesky 1989, Hu and Reeves 1997, Esteves and Valdman 2000). Hence, as the different eluents should be screened for their ability for both maximum recovery of metal ions and the protection of biomass after sorption-desorption cycle (Mehta and Gaur 2005). Ni Cd Pb 48
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BIOSORPTION OF AQUEOUS Pb 2+ , Cd 2
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ABSTRACT BIOSORPTION OF AQUEOUS Pb
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Anyone who has never made a mistake
Page 7 and 8: 2.3. Instrumentation and Apparatus.
Page 9 and 10: Figure 3.16. Effect of biosorbent a
Page 11 and 12: LIST OF TABLES Table Page Table 1.1
Page 13 and 14: · or the change of active conforma
Page 15 and 16: possible kidney disease is as a res
Page 17 and 18: 1.3.1. Heavy Metal Determination Te
Page 19 and 20: leads to develop an economical and
Page 21 and 22: cell metabolism. From the other poi
Page 23 and 24: 3. The metal removal is influenced
Page 25 and 26: 1.5. Algae Living or dead algal cel
Page 27 and 28: 1.5.1. Dunaliella salina Dunaliella
Page 29 and 30: Scenedesmus exists comonly in the p
Page 31 and 32: 1.6.1.2. Entrapment in Polymeric Ma
Page 33 and 34: 2.1. Preparation of Biosorbents CHA
Page 35 and 36: 24 Table 2.1. The properties of che
Page 37 and 38: temperature, and successive loading
Page 39 and 40: 2.6.2. Immobilization of Biosorbent
Page 41 and 42: where ce is the equilibirium concen
Page 43 and 44: CHAPTER 3 RESULTS AND DISCUSSION 3.
Page 45 and 46: Table 3.1. IR stretching frequencie
Page 47 and 48: Table 3.2. Elemental composition of
Page 49 and 50: Figure 3.6. TGA decomposition curve
Page 51 and 52: the underlying mechanism of sorptio
Page 53 and 54: Concentration (x10 -5 Concentration
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Page 63 and 64: Table 3.6. Competitive biosorption
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Page 67 and 68: 3.6.1. Immobilization of Oocystis s
Page 69 and 70: 3.7. Sorption Isotherm Results The
Page 71 and 72: 1/q e 1/q e 1/q e 0.12 0.10 0.08 0.
Page 73 and 74: 1/q e 1/q e 1/q e 0.12 0.10 0.08 0.
Page 75 and 76: logq e logq e logq e -7.00 -6.00 -5
Page 77 and 78: logq e logq e logq e -7.00 -6.00 -5
Page 79 and 80: lnq e lnq e lnq e 0.00 0.00E+00 -2.
Page 81 and 82: lnq e lnq e lnq e 0.00 0.00E+00 -2.
Page 83 and 84: qe (x10-3 qe (x10 mol/g) -3mol/g) q
Page 85 and 86: qe (x10-3 qe (x10 mol/L) -3mol/L) q
Page 87 and 88: CHAPTER 4 CONCLUSION It has been sh
Page 89 and 90: REFERENCES Agency for Toxic Substan
Page 91 and 92: López A., N. Lázaro, A.M. Marqué
Page 93 and 94: Volesky B. 2007. Biosorption and me
Page 95: BBM KOH Solution Contents Concentra
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BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...

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