Removal of Cu(II) using three low-cost adsorbents and prediction of adsorption using artificial neural networks

Abstract

Adsorption of copper using groundnut seed cake power, sesame seed cake powder and coconut cake powders as bioadsorbents was optimized at a pH of 5, temperature of 40 °C, initial metal concentration of 10 mg/L, contact time of 30 min and adsorbent dosage 0.75 g for groundnut seed cake powder and 1.0 g of sesame seed cake powder and coconut cake powder. From the results of kinetic studies, it was concluded that the adsorption process followed pseudo-second-order kinetics. Langmuir adsorption isotherm fit perfect for the adsorption of Cu(II) using the three adsorbents. Maximum adsorption capacity was found to be 4.24 mg/g. Artificial neural network modeling which was adopted for the predication of adsorption of Cu(II) using groundnut seed cake powder, sesame seed cake powder and coconut cake powder was carried out by using back-propagation algorithm. Correlation plot drawn for the experimental and ANN predicted values showed a strong correlation coefficient of 0.989, indicating that the network trained fit apt for the prediction of adsorption process.

Adsorption and desorption studies of <i>Delonix regia</i> pods and leaves: removal and recovery of Ni(II) and Cu(II) ions from aqueous solution

“…Thus, the Freundlich isotherm is a better isotherm to describe the adsorption of Ni(II) and Cu(II) ions onto Delonix regia leaves, whereas the Langmuir isotherm is better fitted to describe adsorption onto the pods. Kumar et al (2019) reported that the sorption of Cu(II) ions onto groundnut seed cake, sesame seed cake and coconut cake powders fit perfectly to the Langmuir isotherm with a Q 0 value ranging from 3.608 to 3.703 mg g −1 . Likewise, Saeed et al (2005a) reported that the biosorption of Cu(II) ions perfectly fit the Langmuir adsorption isotherm model.…”

“…Alatabe (2018) reported 120 min as the optimum sorption time for Cu(II) ions onto activated carbon from Cane papyrus. However, 30 min was the optimum contact time reported by Kumar et al (2019) for the removal of Cu(II) ions using groundnut seed cake powder, sesame seed cake powder and coconut cake powder. The kinetic modelling of data showed that the process was well fitted to the pseudo-second-order kinetic model.…”

“…However, a maximum uptake of 46.7 % was recorded at a pH of 5 for Cu(II) ion sorption onto leaves, and a maximum uptake of 82.9 % was noted at a pH of 4 for Cu(II) ion sorption onto pods; these values were further used for the adsorption of Cu(II) onto leaves and pods respectively. The increase recorded at pH values of 6 and 7 was not considered when choosing the optimum pH at which Cu(II) ion sorption onto leaves occurred due to the presence of visible precipitate which might infer the formation of Cu(OH) 2 or other soluble complexes in the experimental set-up at those pH levels (Larous and Meniai, 2012). Some authors have reported pH values of 5 and 5.8 as optimum for the uptake of Cu(II) ions by some modified natural wastes (Shukla and Pai, 2005;Witek-Krowiak et al, 2011;Anantha and Kota, 2016).…”

Synthesis, structural characterization and Cu(ii) adsorption behavior of manganite (γ-MnOOH) nanorods

“…A high number of approaches have been adapted and practiced to ensure the environmental safety against copper, the most widespread methods being used are: chemical precipitation, chelation/complexation, ion exchange, membrane ltration, ultraltration, reverse osmosis, electrodialysis, otation, among others; all these methods have disadvantages as expensive chemical requirements, energetic costs, sludge disposal issues, among others. [9][10][11] Due to this, the processes involving chemical adsorption have become very important alternatives, owing to their cheap cost effectiveness and the high-quality of the produced treated effluents. 12,13 Among available adsorbents, metal oxides, including ferric oxides, manganese oxides, aluminum oxides, magnesium oxides and cerium oxides, are classied as promising surfaces for heavy metal removal from aqueous systems.…”

Removal and Recovery of Hazardous Metal Ions from the Industrial Effluent using Waste Fish Scale Impregnated Polyurethane Foam: Voltametric Method

“…Besides these, there are a number of effluents and emissions in the atmosphere. Mining activities also add to this problem particularly dusting and particulate matter thus, pollution is a gift of industrial civilization [4][5][6][7] . Among the many other low cost absorbents identified, chitosan has the highest absorption capacity for several metals.…”