Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-Adjusted Meranti Sawdust
Abstract
:1. Introduction
2. Materials and Methods
2.1. Physical and Chemical Properties of the Adsorbents
2.1.1. Na-Bentonite
2.1.2. Sawdust
2.1.3. Alkali and Acidic Treatment of Sawdust
2.2. Sample Preparation and Experimental Methods
3. Results and Discussion
3.1. Component Analysis of the Sawdust
3.2. Charge Characteristic
3.3. Brunauer-Emmett-Teller (BET) Surface Area and Particle Size
3.4. Atomic Adsorption Spectrometry (AAS) “Adsorption Behavior” Results
3.5. Adsorption Mechanisms
3.5.1. Na-Bentonite Adsorption Mechanism
3.5.2. Sawdust Adsorption Mechanism
3.6. pH Variation of the System
3.7. Buffering Capacity
3.8. Scanning Electron Microscope (SEM)
3.9. XRD Analysis
3.10. Chemical Oxygen Demand (COD)
4. Conclusions
- The acid treatment (also called acidification) of the sawdust has led to the improvement in its adsorption capacity through the activation of particle surfaces and the creation of the honeycomb structures.
- The acid treatment has caused an increase in the specific surface area of the sawdust particles. Thus, due to the improved pore sizes in the process, beside the chemically adsorption mechanisms the physical adsorption mechanisms have also participated in retaining the Pb contaminant.
- The reduction in the particle size can lead to increased specific surface area (SSA) and the subsequent augmentation in the adsorption opportunity and adsorption capacity of the outer sawdust surface.
- The high specific surface area (SSA) and high cation exchange capacity (CEC) of the Na-bentonite clay with high plasticity characteristics has increased the capability for high Pb retention through different adsorption mechanisms out of a solution with 100 (cmol/kg-soil) of Pb concentration, without using any sawdust additive.
- The 10% SD4 and the 30% SD2 designs had substantial effects on the Pb adsorption capacity of the Na-Bentonite and therefore were the optimum mix designs. These are the 10% sawdust additive of pH4 and the 30% sawdust additive of pH2.
- The presence of 10% SD4 or 30% SD2 could improve the adsorption capacity of the system as it was capable of adsorbing 100% of the Pb for concentrations up to 150 (cmol/kg-soil).
- For higher Pb concentrations, i.e., between 150 (cmol/kg-soil) and 250 (cmol/kg-soil), the given optimum mix designs of 10% SD4 and the 30% SD2 were capable of 58% adsorption of the Pb.
- The ion exchange and the hydrogen bonding were the main mechanisms introduced by the chemical adsorption capability of the sawdust. Also, the surface complexes and the functional groups have affected the cation adsorption capacity of the sawdust.
- The buffering capacity of the system has been improved by the addition of 10% SD4. Thus the change in pH and the resulting improved buffering capacity of a clay linear system in contact with heavy metals were the most significant geo-environmental behaviors that have aided the adsorption.
- The maximum COD was found with specimens of the highest alkali degree, i.e., involving the SD10 samples, while the minimum COD was found with specimens of the most acidic degree, i.e., involving the SD2 samples. Therefore, the acidification of the sawdust could solve the problem associated with the COD creation, which also corresponds to the maximum adsorption capacity.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Physical Characteristics | Quantity Measured |
---|---|
Clay (%) | 76 |
Silt (%) | 23 |
Sand (%) | 1 |
Liquid limit (%) | 423 |
Plastic limit (%) | 32 |
Plasticity index (PI) (%) | 391 |
Activity (%) | 3.73 |
Soil classification (%) | CH |
Water content (air-dried) (%) | 5.9 |
Water content (oven-dried) (%) | 7.1 |
Specific gravity (Gs) (%) | 2.45 |
Chemical Characteristics | Quantity Measured |
---|---|
Mineral composition in decreasing abundance | Montmorilonite, Quartz, Calsit |
Carbonite content (%) | 8 |
Organic content (%) | 1.4 |
Cation Exchange Capacity (CEC) (Cmol/kg soil) | 80 |
Specific surface area (SSA) (10−3 m2/kg) | 425 |
pH (1:10, Soil/Water ratio) | 9.9 |
Constituent | SiO2 | Al2O3 | Fe2O3 | FeO | Na2O | K2O | CaO | MgO | MnO | TiO2 | Loss of Ignition |
---|---|---|---|---|---|---|---|---|---|---|---|
Percentage present | 69.17 | 14.43 | 3.12 | 0.02 | 1.95 | 0.83 | 1.29 | 3.31 | 0.04 | 0.13 | 5.40 |
Surface Area Data | Pore Volume Data | ||||
---|---|---|---|---|---|
Single Point Surface Area at P/Po (m2/g) | BET Surface Area (m2/g) | Langmuir Surface Area (m2/g) | t-Plot External Surface Area (m2/g) | t-Plot Micro-Pore Volume (cm3/g) | |
Sawdust pH2 | 0.0973 | 0.1237 | 0.2237 | 0.1907 | 0.000032 |
Sawdust pH4 | 0.3869 | 13.2607 | 1.1502 | 13.7163 | 0.000468 |
Sawdust pH6 | 1.8732 | 4.2070 | 1.29.21 | 4.5690 | 0.001185 |
Sawdust pH8 | 1.1082 | 1.3198 | 2.3011 | 1.5219 | 0.000152 |
Sawdust pH10 | 1.2048 | 1.7812 | 4.0343 | 1.8255 | 0.000183 |
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Mohajeri, P.; Smith, C.; Selamat, M.R.; Abdul Aziz, H. Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-Adjusted Meranti Sawdust. Water 2018, 10, 1875. https://doi.org/10.3390/w10121875
Mohajeri P, Smith C, Selamat MR, Abdul Aziz H. Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-Adjusted Meranti Sawdust. Water. 2018; 10(12):1875. https://doi.org/10.3390/w10121875
Chicago/Turabian StyleMohajeri, P., C. Smith, M. R. Selamat, and H. Abdul Aziz. 2018. "Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-Adjusted Meranti Sawdust" Water 10, no. 12: 1875. https://doi.org/10.3390/w10121875
APA StyleMohajeri, P., Smith, C., Selamat, M. R., & Abdul Aziz, H. (2018). Enhancing the Adsorption of Lead (II) by Bentonite Enriched with pH-Adjusted Meranti Sawdust. Water, 10(12), 1875. https://doi.org/10.3390/w10121875