Abstract
With the rise in environmental-conscious research, natural materials (NMs) have drawn attention as eco-sustainable solution for removing hazardous pollutants via adsorption. Although adsorption processes are renowned for their simple implementation, the mechanisms involved in the adsorption of toxins can be complex due to the number of variables involved and their nonlinear interaction. Literature unveils numerous modelling procedures to optimize process variables for the successful metal ions adsorption; however, artificial neural networks’ (ANN) algorithmic approach has accelerated the adsorption propensity of adsorbents for metals ions in water. This review evaluates the ANN approaches (i.e., feedforward neural networks (FFNNs) and neural networks coupled with global optimizers) to simulate the adsorption of different metal ions ranging from heavy metals to highly toxic contaminants (e.g., Ur, Th, As, Cd, Cr, Co, etc.) on NMs. Further, the relative influence of process parameters (such as contact time, pH, initial metal concentration, and dose of NMs) on adsorption has also been outlined. An outlook for future development in the field is provided.
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Abbreviations
- AI:
-
Artificial intelligence
- A.D:
-
Adsorbent dose
- ANN:
-
Artificial neural networks
- ANFIS:
-
Adaptive neuro-fuzzy inference system
- ANN-GA:
-
Genetic algorithm hybridized neural network
- ANN-COA:
-
Cuckoo-optimized hybridized neural network
- ANN-SA:
-
Simulated annealing hybridized neural network
- ANN-GWOA:
-
Wolf-optimized hybridized neural network
- ARPE:
-
Average relative percentage error
- BR:
-
Bayesian regularization
- BD:
-
Bed depth
- CT:
-
Contact time
- Ce:
-
Equilibrium concentration
- FR:
-
Flow rate
- FFNN:
-
Feed forward neural network
- GD:
-
Gradient descent
- GA:
-
Genetic algorithm
- LM:
-
Levenberg–Marquardt
- IC:
-
Initial metal ion concentration
- MAPE:
-
Mean absolute percentage error
- MAE:
-
Mean average error
- MSE:
-
Mean square error
- MRE:
-
Mean relative error
- MNLR:
-
Nonlinear multiple linear regression
- NLR:
-
Nonlinear regression
- PS:
-
Particle size
- R2 :
-
Coefficient of determination
- R:
-
Correlation coefficient
- Rprop:
-
Resilient backpropagation
- RMSE:
-
Root-mean-square error
- RSM:
-
Response surface methodology
- RSE%:
-
Residual error
- SSE:
-
Sum of square error
- SDR:
-
Standard deviation ratio
- SD:
-
Standard deviation
- SCG:
-
Scaled conjugate gradient
- SA:
-
Simplex algorithm
- T:
-
Temperature
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Acknowledgements
The authors would further like to acknowledge Dr. Balasubramanian Kandasubramanian, Professor at the Defence Institute of Advanced Technology Pune and Faculty of Computer Science, IIT Jodhpur, for reviewing the manuscript and providing valuable feedback.
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Nighojkar, A., Plappally, A. & Soboyejo, W. Neural network models for simulating adsorptive eviction of metal contaminants from effluent streams using natural materials (NMs). Neural Comput & Applic 35, 5751–5767 (2023). https://doi.org/10.1007/s00521-023-08315-4
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DOI: https://doi.org/10.1007/s00521-023-08315-4