The effect of pH on removal of toxic metal ions from aqueous solutions using composite sorbent based on Ti-Ca-Mg phosphates

Маслова, М. В.; Mudruk, Natalia; Иванец, А. И.; Шашкова, И. Л.; Китикова, Н. В.

doi:10.1016/j.jwpe.2020.101830

Cited by 20 publications

(10 citation statements)

References 52 publications

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“…One of the most important factors affecting adsorption behavior of adsorbent is surface charge and existing functional groups of the material which depend on solution pH (Maslova et al 2021). Therefore, the point of zero charge (pH PZC ) value was investigated to determine the surface charge of adsorbent.…”

Section: The Effect Of Phmentioning

confidence: 99%

Removal of multiple metal ions from wastewater by a multifunctional metal-organic-framework based trap

Nie

Yang

Zhang

et al. 2021

Water Science and Technology

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The design and preparation of multifunctional adsorbent for practical wastewater treatment is still an enormous challenge. To remove multiple metal ions from wastewater, we developed a broad-spectrum metal ions trap named UIO-67-EDTA by incorporation of ethylenediaminetetraacetic acid into robust UIO-67. The adsorption experiments for 15 kinds of heavy metal ions including hard acid (Mn2+, Ba2+, Al3+, Cr3+, Fe3+), borderline acid (Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Sn2+, Bi2+), soft acid (Ag+, Cd2+, Hg2+), and two kinds of dissolved minerals (Mg2+, Ca2+) show that the trap is very effective both in batch adsorption processes and breakthrough processes. At a pH value of 4.0, the removal efficiency for all metal ions was over 98% within 10 min, and the maximum static adsorption capacity for the representative metal ions Cr3+, Hg2+and Pb2+ was up to 416.67, 256.41, and 312.15 mg g−1, respectively. The adsorption kinetics fitted well with the pseudo-second-order model, indicating that the chemical adsorption was the rate-determining step in the adsorption process. Meanwhile, the material showed high stability and recyclability, the removal efficiency for the three representative metals was still maintained over 93% after five consecutive adsorption cycles.

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Section: The Effect Of Phmentioning

confidence: 99%

Removal of multiple metal ions from wastewater by a multifunctional metal-organic-framework based trap

Nie

Yang

Zhang

et al. 2021

Water Science and Technology

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“…The Zn 2+ adsorption was found to be highly pH-dependent; moreover, in the pH range of 2–8, the modified material far exceeded that of biomass ash in terms of adsorption capacity ( Figure 1 ). When the pH in the system was less than 4, the H + concentration in the solution was very high, and the adsorption capacity of biomass ash to Zn 2+ was very low, which might be due to the competitive adsorption of Zn 2+ and H + at low pH [ 45 , 46 , 47 ]. When the solution pH was considerably low, the value of H 3 O + exceeded that of the Zn 2+ , and most adsorption sites on the material surface were occupied by H 3 O + , thereby reducing the adsorption capacity for the metal ion [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Removal of Zn2+ from Aqueous Solution Using Biomass Ash and Its Modified Product as Biosorbent

Xing

Peng

2022

IJERPH

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To study the removal effect of bottom ash of biomass power plants and its modified products on zinc (Zn2+) in aqueous solution, a series of indoor experiments is carried out. The aim of this work is to explore a method to improve the ability of biomass ash to remove Zn2+ from aqueous solution and obtain its adsorption characteristics of Zn2+ in aqueous solution; on this basis, the feasibility of its application in the treatment of Zn2+-contaminated wastewater is analyzed. The mesoporous siliceous material is used to modify the biomass, and the modified material is functionalized with 3-aminopropyltriethoxysilane. The results show that the specific surface area of modified biomass ash is nine times that of the material before modification. The adsorption capacity of Zn2+ on the material increases with the increase of pH, and pH 6 is the optimum pH to remove Zn2+ from the aqueous solution. The Langmuir model and Freundlich model can show better fits for biomass ash and the modified material, respectively. Thermodynamic analysis results show that the adsorption of Zn2+ is spontaneous and endothermic in nature. The adsorption of Zn2+ onto biomass and modified biomass ash follow pseudo-first-order and pseudo-second-order kinetics, respectively.

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“…Subsequently, the materials were dried, weighed, and used for the next round of adsorption experiments. [ 24–26 ]…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, the materials were dried, weighed, and used for the next round of adsorption experiments. [24][25][26] The adsorption experiment was cycled five times to investigate the recyclability of the materials. This involved repeating the adsorption and desorption steps for a total of five cycles.…”

Section: Desorption and Regenerationmentioning

confidence: 99%

Derivatives Based on Cyclodextrin Structure for Adsorption of Heavy Metal Ions and Organic Pollutants in Wastewater

Shang,

Wang,

Zhang

et al. 2023

Advanced Sustainable Systems

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This study provides a solution for the treatment of heavy metal ions as well as common organic pollutants in water by adsorption, which contributes to the achievement of sustainable development goals. In this work, a new adsorption material, β‐cyclodextrin‐acrylic acid‐acrylamide (CD‐AA‐AM‐MBA), is synthesized. The structure of the materials is characterized and analyzed using fourier transform infrared spectroscopy (FT‐IR), Xray diffraction spectroscopy(XRD), scanning electron microscopy(SEM) and thermogravimetric analysis(TGA). The effects of initial ion concentration, contact time, and different pH values on the adsorption performance are studied. Under the optimized conditions, the adsorption capacity in CD‐AA‐AM‐MBA of Cu2+, Pb2+, Cd2+, Methylene Blue(MB), Methyl Orange(MO), phenol, m‐cresol and p‐cresol are 58.66, 326, 48.5, 58.27, 51.34, 6.63, 3.7 and 5.91 mg g−1.

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The effect of pH on removal of toxic metal ions from aqueous solutions using composite sorbent based on Ti-Ca-Mg phosphates

Cited by 20 publications

References 52 publications

Removal of multiple metal ions from wastewater by a multifunctional metal-organic-framework based trap

Removal of multiple metal ions from wastewater by a multifunctional metal-organic-framework based trap

Removal of Zn2+ from Aqueous Solution Using Biomass Ash and Its Modified Product as Biosorbent

Derivatives Based on Cyclodextrin Structure for Adsorption of Heavy Metal Ions and Organic Pollutants in Wastewater

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