New insights into the carboxymethyl cellulose adsorption on scheelite and calcite: adsorption mechanism, AFM imaging and adsorption model

Abstract In this study, manganese dioxide was evenly distributed on the surface of activated carbon (AC), and the porous structure of AC and the surface functional groups of manganese dioxide were used to adsorb the heavy metal ion Pb(II). The advantages of microwave heating are fast heating and high selectivity. The mole ratio control of the AC and MnO2 in 1:0.1, microwave heating to 800 °C, heat preservation for 30 min. The maximum adsorption capacity of the MnO2-AC prepared by this method on Pb(II) can reach 664 mg/L at pH = 6. It can be observed by SEM that manganese dioxide particles are dispersed evenly on the surface and pore diameter of AC, and there is almost no agglomeration. The specific surface area was 752.8 m2/g, and the micropore area was 483.9 m2/g. The adsorption mechanism was explored through adsorption isotherm, adsorption kinetics, FTIR, XRD, XPS. It is speculated that the adsorption mechanism includes electrostatic interaction and specific adsorption, indicating that lead ions enter into the void of manganese dioxide and form spherical complexes. The results showed that the adsorption behavior of Pb(II) by MnO2-AC was consistent with the Langmuir adsorption model, the quasi-second-order kinetic model, and the particle internal diffusion model.

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Efficient Pb(II) removal using sodium alginate–carboxymethyl cellulose gel beads: Preparation, characterization, and adsorption mechanism

Carbohydrate Polymers ◽

10.1016/j.carbpol.2015.11.002 ◽

2016 ◽

Vol 137 ◽

pp. 402-409 ◽

Cited By ~ 133

Author(s):

Huixue Ren ◽

Zhimin Gao ◽

Daoji Wu ◽

Jiahui Jiang ◽

Youmin Sun ◽

...

Keyword(s):

Sodium Alginate ◽

Carboxymethyl Cellulose ◽

Adsorption Mechanism ◽

Gel Beads ◽

Cellulose Gel

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Preparation of sustainable non-combustion filler substrate from waterworks sludge/aluminum slag/gypsum/silica/maifan stone for phosphorus immobilization in constructed wetlands

Water Science & Technology ◽

10.2166/wst.2019.258 ◽

2019 ◽

Vol 80 (1) ◽

pp. 153-163 ◽

Cited By ~ 4

Author(s):

Guanghui Wang ◽

Jingqing Gao ◽

Rongxue Yang ◽

Jingshen Zhang ◽

Han Guo ◽

...

Keyword(s):

Constructed Wetlands ◽

Phosphorus Removal ◽

Adsorption Mechanism ◽

High Efficiency ◽

Removal Rate ◽

Combustion Process ◽

Speciation Analysis ◽

Adsorption Model ◽

Isothermal Adsorption ◽

Phosphorus Adsorption

Abstract In this study, an artificial wetland filler matrix capable of effectively fixing phosphorus was prepared using a non-combustion process to save energy. To evaluate the adsorption performance of this filler, adsorption experiments were performed and the phosphorus adsorption mechanism characterization was studied. An alkaline environment was found to be conducive to the increase of adsorption capacity, but excessive alkalinity was not conducive to adsorption. Static adsorption experiments showed that the phosphorus removal rate could reach 95% in the simulated phosphorus-containing wastewater after adsorption completion. The adsorption process is closely simulated by the pseudo-second-kinetic adsorption model. The isothermal adsorption experiment data were consistent with the Langmuir and the Freundlich adsorption isotherms. The characterization results showed a large number of micropores and adsorption binding sites inside and on the surface of the filler. Speciation analysis on the adsorbed phosphorus revealed that chemisorption by calcium in this filler was the dominant adsorption mechanism. The research results of this study provide the basis and reference for the development of high-efficiency phosphorus removal filler in constructed wetlands.

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Directionally-Grown Carboxymethyl Cellulose/Reduced Graphene Oxide Aerogel with Excellent Structure Stability and Adsorption Capacity

Polymers ◽

10.3390/polym12102219 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2219

Author(s):

Mengke Zhao ◽

Sufeng Zhang ◽

Guigan Fang ◽

Chen Huang ◽

Ting Wu

Keyword(s):

Graphene Oxide ◽

Adsorption Capacity ◽

Reduced Graphene Oxide ◽

Carboxymethyl Cellulose ◽

Organic Dyes ◽

Structure Stability ◽

Maximum Adsorption Capacity ◽

Adsorption Model ◽

Composite Aerogel ◽

Reduced Graphene

A novel three-dimensional carboxymethyl cellulose (CMC)/reduced graphene oxide (rGO) composite aerogel crosslinked by poly (methyl vinyl ether-co-maleic acid)/poly (ethylene glycol) system via a directional freezing technique exhibits high structure stability while simultaneously maintaining its excellent adsorption capacity to remove organic dyes from liquid. A series of crosslinked aerogels with different amounts of GO were investigated for their adsorption capacity of methylene blue (MB), which were found to be superb adsorbents, and the maximum adsorption capacity reached 520.67 mg/g with the incorporation of rGO. The adsorption kinetics and isotherm studies revealed that the adsorption process followed the pseudo-second-order model and the Langmuir adsorption model, and the adsorption was a spontaneous process. Furthermore, the crosslinked aerogel can be easily recycled after washing with dilute HCl solution, which could retain over 97% of the adsorption capacity after recycling five times. These excellent properties endow the crosslinked CMC/rGO aerogel’s potential in wastewater treatment and environment protection.

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The Mo-Co-Al2O3 System. II) Model of Adsorption of Molybdenum on Al2O3 and on Co-Al2O3

Adsorption Science & Technology ◽

10.1177/026361748800500106 ◽

1988 ◽

Vol 5 (1) ◽

pp. 57-64 ◽

Cited By ~ 4

Author(s):

M.I. Morales ◽

M.N. Blanco ◽

H.J. Thomas

Keyword(s):

Adsorption Isotherms ◽

Adsorption Mechanism ◽

Equilibrium Constants ◽

Spectroscopic Studies ◽

Experimental Results ◽

Equilibrium Adsorption ◽

Adsorption Model ◽

Adsorption Sites ◽

Polymeric Species ◽

Two Systems

A model which interprets the equilibrium adsorption of molybdenum on Al2O3 and on Co-Al2O3 is presented. This model assumes the adsorption of monomelic and polymeric species of molybdenum on two different adsorption sites of the support. It is proposed a) that the adsorption mechanism can be represented by two independent adsorption reactions; b) that each species is adsorbed only on one type of site, and c) that the adsorption isotherms can be represented by the sum of a Langmuir type expression for the monomer and a sigmoidal one for the polymer. By applying this model to the experimental isotherms obtained for the two systems under study (Mo/Al2O3 and Mo/Co-Al2O3), the equilibrium constants for adsorption on site 1 (K,) and on site 2 (K2) and the numbers of adsorption sites S1 and S2 have been estimated. This adsorption model was confirmed by experimental results data and by spectroscopic studies.

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