Statistical optimization and batch studies on adsorption of phosphate using Al-eggshell

Yan, Zhang; Li, Hui; Zhang, Yuyan; Song, Fengjuan; Cao, Xiaoqiang; Lyu, Xianjun; Crittenden, John C.

doi:10.1177/0263617417740790

Cited by 30 publications

(19 citation statements)

References 48 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it can be deduced that adsorption of metal ions on unmodified bentonite and modified bentonite follows different mechanisms. The values of n for the Freundlich model is <1, indicating that the two metal ions are favorably adsorbed by bentonite at all temperatures and that a nonlinear adsorption occurred on the bentonite surfaces . From the Table and Figure , we can see that the q m of Cu(II) and Ni(II) obtained from the SA system are higher than those obtained from the BA system.…”

Section: Resultsmentioning

confidence: 86%

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Xiao

Cao

Lyu

et al. 2019

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

In this study, the competitive adsorption of Cu(II) and Ni(II) adsorption onto bentonite were investigated. The effects of initial adsorbate concentration, pH, contact time, temperature on adsorption and the kinetics, thermodynamic, quantification of adsorption competition and competitive mechanisms have been studied. The results indicated that Cu(II) has a higher affinity than Ni(II) for adsorption on bentonite. But the inhibition effect was not noticeable under alkaline conditions. The Langmuir and pseudo-second-order kinetics models can be applied to simulate the isothermal adsorption and adsorption dynamic, respectively. Under a single system/binary system, the maximum adsorption capacity of bentonite for Cu(II) and Ni(II) is 12.76/10.57 and 11.12/9.11 mg/g, respectively. The equilibrium adsorption capacity reduction rate is suitable for quantitative characterization of adsorption competition under any concentration conditions; adsorption competition coefficient is more suitable for low concentration adsorption; although the distribution coefficient is not suitable for quantitative adsorption competition at high concentrations, it can be used to characterize the variation of adsorption competitiveness of Cu(II) at different concentrations. The higher electronegativity, lower first hydrolysis constant and Misono softness, and a better "guest-host" consistency between Cu(II)O 6 and the vacancies in the montmorillonite octahedral sheet make the higher affinity of Cu(II) to bentonite and result in the possible ion exchange between Cu(II) in solution and adsorbed Ni(II). In addition, at high concentrations, Cu(II) and Ni(II) precipitates formed on the surface of montmorillonite may cause remained Cu(II) ions in the solution unable to enter the internal space of the montmorillonite octahedron. K E Y W O R D S nickel, copper, bentonite, quantification of adsorption competition, mechanisms

show abstract

Section: Resultsmentioning

confidence: 86%

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Xiao

Cao

Lyu

et al. 2019

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is mainly because that well-dispersed CeO 2 nanoparticles in the L-NH 2 that provides more CeO 2 active sites exposed for phosphate adsorption. Furthermore, certain materials have been used for removing phosphate, 1,18,23,[33][34][35][45][46][47][48][49] as summarized in Table S1. † As-fabricated L-NH 2 @Ce exhibited a high adsorption capacity of phosphate than some of the previously reported biosorbents, such as Ce/ Fe 3 O 4 -BC (18.75 mg g À1 ), Fe-CL (0.942 mg g À1 ), LBR-Zr (8.75 mg g À1 ), ILO (4.785 mg g À1 ), iron hydroxide eggshell (14.49 mg g À1 ).…”

Section: Adsorption Isothermmentioning

confidence: 99%

Cerium oxide nanoparticle functionalized lignin as a nano-biosorbent for efficient phosphate removal

Liu

Zhang

et al. 2020

RSC Adv.

View full text Add to dashboard Cite

Removing excess phosphorus is a highly effective method to prevent eutrophication in contaminated water.However, the design and preparation of an efficient biosorbent for phosphate capture is still a great challenge. We fabricated a novel, and inexpensive nano-biosorbent, L-NH 2 @Ce, by loading cerium oxide nanoparticles (nano-CeO 2 ) within the aminated lignin using a facile in situ precipitation approach for efficient phosphate removal. The as-designed nano-biosorbent L-NH 2 @Ce exhibited a BET surface area (S BET ) of 89.8 m 2 g À1 , 3 times that of lignin, and a pore volume (V p ) of 0.23 cm 3 g À1 . Owing to these results, the adsorption capacity of L-NH 2 @Ce increased by 14-fold to 27.86 mg g À1 compared with lignin (1.92 mg g À1 ). Moreover, the L-NH 2 @Ce can quickly reduce a high phosphate concentration of 10 ppm to well below the discharge standard of 0.5 ppm recommended by the World Health Organization (WHO) for drinking water. Importantly, a study of leaching tests indicated the negligible risk of Ce ion leakage during phosphate adsorption over the wide pH range of 4-9. Moreover, L-NH 2 @Ce exhibits good reusability and retains 90% of removal efficiency after two adsorption-desorption cycles.The environmentally benignity of the raw material, the simple preparation process, and the high stability and reusability makes L-NH 2 @Ce a promising nano-biosorbent for phosphate removal. † Electronic supplementary information (ESI) available: The phosphate adsorption capacity of L-NH 2 @Ce in comparison with some biosorbents. See Fig. 3 (a) Adsorption kinetics of phosphate on L-NH 2 @Ce, and fitting results for (b) pseudo-second-order model and (c) pseudo-first-order model on L-NH 2 @Ce. 1254 | RSC Adv., 2020, 10, 1249-1260 This journal is

show abstract

“…After 14 and 24 days of incubation, the mineral precipitates were analyzed by XRD (D/Max-RC, Rigaku Co., Tokyo, Japan), with a scanning angle from 10 • -80 • , a step size of 0.02, and a count time of 8 • •min −1 [59][60][61][62][63][64][65][66][67][68]. The XRD data were analyzed by the Jade 6.5 software (Version 6.5, Materials Data Ltd., Livermore, CA, USA).…”

Section: Characterization Of the Extracellular Mineral Precipitatesmentioning

confidence: 99%

Mechanism of Biomineralization Induced by Bacillus subtilis J2 and Characteristics of the Biominerals

et al. 2019

View full text Add to dashboard Cite

Biomineralization induced by microorganisms has become a hot spot in the field of carbonate sedimentology; however, the mechanisms involved still need to be explored. In this study, the bacterium Bacillus subtilis J2 (GenBank MG575432) was used to induce the precipitation of calcium carbonate minerals at Mg/Ca molar ratios of 0, 3, 6, 9, and 12. Bacillus subtilis J2 bacteria released ammonia to increase pH, but the ammonia released only made the pH increase to 8.25. Carbonic anhydrase was also produced to catalyze the hydration of carbon dioxide, and this process released carbonate and bicarbonate ions that not only increased pH but also elevated carbonate supersaturation. The biominerals formed at a Mg/Ca molar ratio of 0 were spherulitic, elongated, dumbbell-shaped, and irregularly rhombohedral calcite; at a Mg/Ca molar ratio of 3, the biominerals were calcite and aragonite, the weight ratio of calcite decreased from 26.7% to 15.6%, and that of aragonite increased from 73.3% to 84.4% with increasing incubation time. At higher Mg/Ca molar ratios, the biominerals were aragonite, and the crystallinity and thermal stability of aragonite decreased with increasing Mg/Ca molar ratios. FTIR results showed that many organic functional groups were present on/within the biominerals, such as C–O–C, N–H, C=O, O–H, and C–H. HRTEM-SAED examination of the ultra-thin slices of B. subtilis J2 bacteria showed that nano-sized minerals with poor crystal structure had grown or been adsorbed on the EPS coating. The EPS of the B. subtilis J2 strain contained abundant glutamic acid and aspartic acid, which could be deprotonated in an alkaline condition to adsorb Ca2+ and Mg2+ ions; this made EPS act as the nucleation sites. This study may provide some references for further understanding of the mechanism of biomineralization induced by microorganisms.

show abstract

Statistical optimization and batch studies on adsorption of phosphate using Al-eggshell

Cited by 30 publications

References 48 publications

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Cerium oxide nanoparticle functionalized lignin as a nano-biosorbent for efficient phosphate removal

Mechanism of Biomineralization Induced by Bacillus subtilis J2 and Characteristics of the Biominerals

Contact Info

Product

Resources

About