“…Thus, the phosphate adsorption onto algae–Mo depends on the initial phosphate concentration and contact time. This result is in agreement with previous literature (Liu et al 2016; Ogata et al 2016). Fig.…”
In this paper, a new and facile approach for molybdate loading in the brown algae of Sargassum angustifolium is introduced. The molybdate ions were entered into the algae body during a short cultivation to produce algae–Mo as a novel adsorbent for eliminating phosphate ions from synthetic and real wastewaters. Results of the surface analysis showed that molybdate loading onto the algae was successfully performed. Herein, basic variables, such as initial solution pH, adsorbent dosage, contact time, phosphate concentration, and temperature, were investigated in detail to assess the phosphate adsorption performance of algae–Mo. The pseudo-second-order kinetic model fitted our acquired experimental kinetic data most appropriately, in comparison to the use of a pseudo-first-order model. The Langmuir model appeared to fit the adsorption data more desirably than that of Freundlich and Dubnin–Radushkevich models, with a maximum phosphate adsorption capacity of 149.25 mg/g at 25 °C. The finding of the thermodynamic study revealed that the phosphate adsorption onto algae–Mo was spontaneous, feasible, and endothermic in nature. The study on Mo2+ ions leaching strongly suggested that the risk of Mo2+ leakage during phosphate adsorption was negligible at a wide pH range of 3–9. The adsorption efficiency attained was 53.4% at the sixth cycle of reusability. Two real wastewaters with different qualities were successfully treated by the algae–Mo, suggesting that the algae–Mo could be ordered for practical wastewater treatment.
“…Thus, the phosphate adsorption onto algae–Mo depends on the initial phosphate concentration and contact time. This result is in agreement with previous literature (Liu et al 2016; Ogata et al 2016). Fig.…”
In this paper, a new and facile approach for molybdate loading in the brown algae of Sargassum angustifolium is introduced. The molybdate ions were entered into the algae body during a short cultivation to produce algae–Mo as a novel adsorbent for eliminating phosphate ions from synthetic and real wastewaters. Results of the surface analysis showed that molybdate loading onto the algae was successfully performed. Herein, basic variables, such as initial solution pH, adsorbent dosage, contact time, phosphate concentration, and temperature, were investigated in detail to assess the phosphate adsorption performance of algae–Mo. The pseudo-second-order kinetic model fitted our acquired experimental kinetic data most appropriately, in comparison to the use of a pseudo-first-order model. The Langmuir model appeared to fit the adsorption data more desirably than that of Freundlich and Dubnin–Radushkevich models, with a maximum phosphate adsorption capacity of 149.25 mg/g at 25 °C. The finding of the thermodynamic study revealed that the phosphate adsorption onto algae–Mo was spontaneous, feasible, and endothermic in nature. The study on Mo2+ ions leaching strongly suggested that the risk of Mo2+ leakage during phosphate adsorption was negligible at a wide pH range of 3–9. The adsorption efficiency attained was 53.4% at the sixth cycle of reusability. Two real wastewaters with different qualities were successfully treated by the algae–Mo, suggesting that the algae–Mo could be ordered for practical wastewater treatment.
“…The highest phosphate ion adsorption capacities of 9.0, 12.0, and 15.0 mg/g for PET20L, PET20M, and PET20S, respectively, were observed at pH 6.0 − 7.0. Previous studies reported similar trends [3,20,22,39,55]. At pH lower than 2.16, phosphorus mainly existed in the form of H 3 PO 4 .…”
Section: Effect Of Solution Ph On the Adsorption Of Phosphate Ions Onsupporting
confidence: 73%
“…For instance, Al-Fe hydroxide, mesoporous Cr-Zr binary oxide nanoadsorbent, hydrous zirconium oxide-based nanocomposites, and Fe-Al-Mn trimetal oxide have been reported as phosphate-ion-removal agents [24][25][26][27]. In addition, we previously reported that nickel hydroxide, cobalt hydroxide, and cobalt-containing nickel hydroxide show sufficient capabilities for phosphate ion adsorption [20,22,28].…”
Section: Introductionmentioning
confidence: 97%
“…In recent years, the development of composite adsorbents for phosphate ion removal containing two (or more) metal oxides has gained increasing attention [20][21][22][23]. Composite metal oxides may show different physicochemical properties from those of their single-component counterparts [22].…”
In this study, nickel hydroxide containing cobalt as a co-precipitation hydroxide (NiCo91) was granulated with a binder (polyethylene terephthalate, PET) and characterized (scanning electron microscopy, specific surface area, amount of hydroxyl groups, and surface pH). In addition, the phosphate ion adsorption capability of the granulated adsorbent was evaluated by examining the effects of contact time and solution pH, analysis of adsorption isotherms, and a desorption study. It was confirmed that NiCo91 calcined at 270°C could be granulated using a PET binder. The specific surface area (32 m 2 /g) and hydroxyl group amount (0.19 mmol/g) of PET20S (20% binder content and < 500 μm particle diameter) were greater than those of other adsorbents. The amount of the adsorbed phosphate ions was greater for PET20S than that for other adsorbents, indicating that the adsorbent surface properties were related to the adsorption of phosphate ions. The phosphate ions adsorbed onto PET20S could be desorbed by different concentrations of sodium hydroxide, and at least three-fold increase in adsorption/desorption onto PET20S could be obtained. The results show that PET20S is highly promising as a renewable adsorbent of phosphate ions from aqueous solutions.
“…The success of the pseudo-second-order model in fitting the experimental data suggests that the dyes are chemisorbed on PGA. [40][41][42] Effect of Initial Dye Concentration on Adsorption of MB or CV by PGA Figure 5 shows the effect of the initial dye concentration on adsorption of MB or CV by PGA. The adsorption rate of MB and CV increases with decreasing initial concentration.…”
In this study, the adsorption capability of cationic dyes, which were methylene blue and crystal violet, by poly-γ-glutamic acid (PGA) in a single or binary solution system was investigated. The effect of the molecular weight of PGA, initial dye concentration, solution pH, and temperature on the adsorption of dyes was evaluated. The adsorption mechanism of dyes onto PGA was the interaction between -COOH group on the PGA surface and the polarity groups of dyes. These results indicated that PGA is useful for removal of dyes and cationic organic compounds from a single or binary solution system.
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