Synthesis of Indonesian Kaolin-nZVI (IK-nZVI), Evaluation for the Removal of Pb(II) from Waste Streams

Removal of toxic pollutants such as heavy metals from wastewater is of utmost importance in the current century. Heavy metals have severed a big problem in the world. Several tools have been established to mitigate this problem. In this research paper, Indonesian Kaolin-nano zerovalent iron (IK-nZVI) was synthesized as a model adsorbent for Pb(II) removal from wastewater. The efficiency of IK supported nZVI for Pb(II) removal efficiency was estimated by accompanying batch experiments. The examined parameters included the amount of IK-nZVI, the concentration of Pb(II) removal and the effect of pH. The results revealed that the IK-nZVI was efficient for the removal of Pb(II) from waste water. © 2020 Author(s).The author Lakkaboyana Sivarama Krishna is grateful to the Graduate School and The Thailand Research Fund (IRG578001), Chulalongkorn University for providing financial support, Senior Postdoctoral Fellowship under Rachadapisaek Sompote Fund

Self-diffusion of water-ethanol mixture in chitosan membranes obtained by pulsed-field gradient nuclear magnetic resonance technique

The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes. | The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes

Effect of cetyltrimethylammonium bromide on the biosorption of Acid Blue 25 onto Bengal gram fruit shell

This study explores an intensive investigation of the effect of cationic surfactant, cetyltrimethylammonium bromide (CTAB) on biosorption of Acid Blue 25 (AB25), an anionic dye, onto Bengal gram fruit shell (BGFS) from aqueous solution. The BGFS was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. Effect of AB25 and CTAB concentrations, time and temperature, were explored. The dye uptake by the BGFS was increased with increasing initial dye concentration up to 100 mg L-1. The inclusion of 0.9 mmol L-1 of CTAB in the biosorption medium was greatly improved for the removal of AB25. The AB25 uptake was better described by the Langmuir adsorption model than the Freundlich model. This study shows that the maximum uptake of AB25 dye by BGFS in the absence of surfactant was evaluated and found 29.4 mg g-1. Also, the results of this investigation revealed that the presence of 0.9 mmol L-1 CTAB in the biosorption medium increased the maximum uptake of AB25 to 166.6 mg g-1, which is 5.7 times higher than the uptake capacity in the absence of CTAB. The biosorption kinetics was correctly described by the pseudo-second-order kinetic model for all cases studied a confirmation that a chemisorption process controlled the biosorption rate. Thermodynamic parameters (ΔH°, ΔS°, and ΔG°) were determined for the biosorption of AB25 onto BGFS-CTAB. The biosorption process describes that the reaction was exothermic and spontaneous processes

Self-diffusion of water-ethanol mixture in chitosan membranes obtained by pulsed-field gradient nuclear magnetic resonance technique

The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes. | The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes

Self-diffusion of water-ethanol mixture in chitosan membranes obtained by pulsed-field gradient nuclear magnetic resonance technique

The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes. | The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes

Self-diffusion of water-ethanol mixture in chitosan membranes obtained by pulsed-field gradient nuclear magnetic resonance technique

The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes. | The self-diffusion of water and ethanol for crosslinked and uncrosslinked chitosan membranes have been investigated by pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy. It has been shown that during diffusion processes, water and ethanol are localized in different parts of the chitosan membrane. In the crosslinked membrane, the self-diffusion coefficient for water is higher, but that for ethanol is essentially lower, than those for the uncrosslinked membrane. For this reason, the mobility selectivity is essentially higher in crosslinked membrane as compared to the uncrosslinked. The sorption selectivity are the same for these two types of membranes

Kaolin-nano scale zero-valent iron composite(K-nzvi): Synthesis, characterization and application for heavy metal removal

The present study explored the synthesis of Kaolin-nano scale zero-valent iron composite (K-nZVI) by using chemical reduction method. Sorption characteristics of the K-nZVI for the removal of Cu(II) ions was studied in batch conditions. The physical and chemical structure of the K-nZVI composite was characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-XRF), X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller studies (BET). The effect of pH, the initial metal ion concentration, and contact time on adsorption of Cu(II) onto K-nZVI was investigated. The K-nZVI exhibited good sorption performances over the initial pH range from 2.5 to 6.5. The kinetics data was studied by applying two sorption kinetic models (Pseudo-first and Pseudo-second-order) equations. The pseudo-second-order model was relatively suitable for describing the adsorption process. The equilibrium adsorption data is well fitted to Langmuir adsorption models. The maximum adsorption capacities of K-nZVI sorbent as obtained from Langmuir adsorption isotherm is found to be 178–200 mg g−1 for Cu(II). Sorption isotherm models (Langmuir and Freundlich) were applied to the experimental data. The adsorption kinetics was well represented by the pseudo second order rate equation, and the adsorption isotherms were better fitted by the Langmuir equation. The thermodynamic studies showed that the adsorption reaction of Cu(II) is endothermic processes. TheK-nVZI having number of features including easy preparation, environmentally friendly nature, low-cost and good sorption performance enable K-nZVI application in industrial purpose specifically in the field of industrial water treatment

Adsorption of acid blue 25 from aqueous solution using zeolite and surfactant modified zeolite

In the present study, we have demonstrated the Indonesian natural zeolite and modified zeolite was used to remove the acid blue 25 (AB25) from wastewater. The adsorption capacity of AB25 on zeolite and modified zeolite (zeolite-CTAB) were investigated by various batch adsorption experiments. The modification effect on the surface of zeolite was analyzed using Fourier transforms infrared spectra, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence, and X-ray diffraction, respectively. The maximum removal of AB25 was obtained under acidic conditions at pH 2. The kinetic experimental results imply that the adsorption of AB25 onto these adsorbents well followed the second-order kinetic model. The maximum adsorption capacity of 64.2 mg/g was found in Zeolite at 30°C and 112.44 mg/g for zeolite-CTAB at 60°C. The results revealed that the adsorption of AB25 onto zeolite-CTAB fitted better to Langmuir model and Zeolite fitted better with Freundlich model. The AB25 adsorption on zeolite-CTAB increases with an increasing temperature indicates that the preferential adsorption may occur at a higher temperature. The positive value of ∆H° in zeolite-CTAB material thermodynamic parameters indicates that the process was an endothermic process. These results indicate that zeolite-CTAB has high adsorbent efficiency and it is promising adsorbents for removing the dye AB25