Abstract:Valorization of waste materials and byproducts as adsorbents is a sustainable approach for water treatment systems. Pottery Granules (PG) without any chemical and thermal modification were used as a low-cost, abundant, and environmentally benign adsorbent against Pb(II), the toxic metal in drinking water. The porous structure and complex mineral composition of PG made it an efficient adsorbent material for Pb(II). The effect of key physicochemical factors was investigated to determine the significance of conta… Show more
“…The graph also reveals the adsorption decreased from ~ 99 to ~ 76% when MNZ concentration increased in the studied range. A higher competition for limited adsorption sites on the surface is the possible cause of removal drop as also described in earlier works 9 , 39 . Figure 4 MNZ removal by ZIF-67-SO 4 as a function of antibiotic concentration (ZIF-67-SO 4 : 1g/L, pH = 7).…”
Metronidazole (MNZ) is an extensively used antibiotic against bacterial infections for humans and farm animals. Prevention of antibiotics discharge is essential to prevent adverse environmental and health impacts. A member of metal–organic frameworks, zeolite imidazole framework-67 with cobalt sulfate precursor (ZIF-67-SO4) and exceptional physio-chemical properties was prepared via room temperature precipitation to adsorb MNZ. The study framework was designed by Box–Behnken Design to evaluate the effect of pH, ZIF-67-SO4 dose, and contact time on adsorption efficiency. The polynomial model fitted the adsorption system indicated the optimal condition for 97% MNZ removal occurs at pH = 7, adsorbent dosage = 1 g/L, and mixing time = 60 min. The model also revealed that the removal increased with contact time and decreased at strong pH. Equilibrium and kinetic study also indicated the adsorption of MNZ followed the intra-particle diffusion model and the Langmuir isotherm model with a qmax = 63.03 mg/g. The insignificant loss in removal efficacy in use-reuse adsorption cycles reflected the practical viability of ZIF-67-SO4.
“…The graph also reveals the adsorption decreased from ~ 99 to ~ 76% when MNZ concentration increased in the studied range. A higher competition for limited adsorption sites on the surface is the possible cause of removal drop as also described in earlier works 9 , 39 . Figure 4 MNZ removal by ZIF-67-SO 4 as a function of antibiotic concentration (ZIF-67-SO 4 : 1g/L, pH = 7).…”
Metronidazole (MNZ) is an extensively used antibiotic against bacterial infections for humans and farm animals. Prevention of antibiotics discharge is essential to prevent adverse environmental and health impacts. A member of metal–organic frameworks, zeolite imidazole framework-67 with cobalt sulfate precursor (ZIF-67-SO4) and exceptional physio-chemical properties was prepared via room temperature precipitation to adsorb MNZ. The study framework was designed by Box–Behnken Design to evaluate the effect of pH, ZIF-67-SO4 dose, and contact time on adsorption efficiency. The polynomial model fitted the adsorption system indicated the optimal condition for 97% MNZ removal occurs at pH = 7, adsorbent dosage = 1 g/L, and mixing time = 60 min. The model also revealed that the removal increased with contact time and decreased at strong pH. Equilibrium and kinetic study also indicated the adsorption of MNZ followed the intra-particle diffusion model and the Langmuir isotherm model with a qmax = 63.03 mg/g. The insignificant loss in removal efficacy in use-reuse adsorption cycles reflected the practical viability of ZIF-67-SO4.
“…It can be seen that the initial rate of MB adsorption rapidly increased and reached equilibrium after 90 min due to the saturation of the adsorbent. Higher initial concentrations of MB dye show an increment in adsorption capacity, which could be due to excessive driving force between the liquid and solid phase and reflect an efficient utilisation of adsorbent sites [28]. The calculated model parameters are presented in Table 3.…”
Section: Evaluation Of Adsorption Isotherm and Kinetic Modelmentioning
Dyes containing waste streams are the most common pollutants found in wastewater, posing a severe threat to both the ecosystem and the environment. Adsorption emerges as one of the most effective and widely applied treatments for removing dyes due to its simple operation, high efficiency, and low cost. Sodium alginate, as a biopolymer, is one of the alternative adsorbents used in the adsorption process. However, the lack of active sites and low rigidity limits the adsorption capacity performance of this biopolymer. This study aims to introduce biopolymer-based composite adsorbent beads for removing methylene blue (MB) dye from an aqueous solution. Herein, TA/PANI/SA composite adsorbent beads consisting of tannic acid (TA) and polyaniline (PANI) were prepared by the cross-linking method of sodium alginate (SA) with the presence of divalent cations in calcium chloride. Characterization was performed using FTIR analysis to determine the changes in surface-modified composite beads. The results indicated that the removal efficiency of MB dye exhibited a significant enhancement of up to 72% when compared to untreated alginate beads, which only achieved approximately 30% removal. It was also found that the interactions occurred during the cross-linking process as well as during the adsorption process of MB dye onto the composite adsorbent beads. The adsorption mechanisms of MB dye by composite adsorbent beads include electrostatic interaction, π-π interactions, and hydrogen bonding. The improvement in the removal efficiency and the possibility of interactions during the cross-linking process suggested that the biopolymer-based composite beads have great potential to be used as adsorbents for removing dye in an aqueous solution.
“…Adsorption has the advantage over the other simple design methodologies and low investment [32] . The search for low-cost adsorbents with high adsorption capacities has recently intensified [33][34][35][36] . There has been a constant demand for solid-phase adsorbents with improved adsorptive capacity, selectivity, stability, and analyte recoveries [37,38] .…”
Xylene isomers are notorious chemical hazards, and their efficient removal from water solutions is still challenging. The current study reports a polymer nanocomposite as a potential adsorbent for successfully removing dissolved xylene isomers from contaminated water. Polystyrene-1D multiwall carbon nanotube nanocomposite (PS-MWCNT) adsorbent was prepared using the one-step bulk polymerization method. Mesoporous PS-MWCNT was prepared using the nano-crystallization phase separation method. The sulfonation of the mesoporous PS-MWCNT nanocomposites was carried out by treating the samples with concentrated sulfuric acid at elevated temperatures. The sulfonated PS-MWCNT (HO3S-PS-MWCNT) was found to be a potential adsorbent for dissolved xylene isomers from water solution. In addition, the HO3S-PS-MWCNT can be efficiently recycled for up to 10 consecutive cycles with negligible decline in adsorption values. The exhibited equilibrium adsorption, rate of adsorption, and rapid regeneration of the HO3S-PS-MWCNT are clear indications for the possibility of practical utilization of these adsorbents in large-scale water treatment plants.
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