Uniform surface modification of diatomaceous earth with amorphous manganese oxide and its adsorption characteristics for lead ions

Li, Song; Li, Duanyang; Su, Fei; Ren, Yanzhi; Qin, Gaowu

doi:10.1016/j.apsusc.2014.08.184

Cited by 45 publications

(18 citation statements)

References 23 publications

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“…Freundlich model suggested heterogeneous adsorption sites which resulted due to the modification [38] of CP1 and CP2 surfaces by uneven distribution of palygorskite or chitosan thus allowed multilayer adsorption. All composites exhibited 1/n values between 0 and (Table 4), which indicated a favourable adsorption.…”

Section: Adsorption Isothermmentioning

confidence: 98%

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Rusmin

Sarkar

Liu

et al. 2015

Applied Surface Science

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a b s t r a c tThis paper investigates the structural evolution of chitosan-palygorskite (CP) composites in relation to variable mass ratios of their individual components. The composite beads' performance in lead (Pb) adsorption from aqueous solution was also examined. The composite beads were prepared through direct dispersion of chitosan and palygorskite at 1:1, 1:2 and 2:1 mass ratios (CP1, CP2 and C2P, respectively). Analyses by Fourier transform Infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed the dependence of the composites' structural characteristics on their composition mass ratio. The chitosan-palygorskite composite beads exhibited a better Pb adsorption performance than the pristine materials (201.5, 154.5, 147.1, 27.7 and 9.3 mg g −1 for CP1, C2P, CP2, chitosan and palygorskite, respectively). Adsorption of Pb by CP1 and CP2 followed Freundlich isothermal model, while C2P fitted to Langmuir model. Kinetic studies showed that adsorption by all the composites fitted to the pseudo-second order model with pore diffusion also acting as a major rate governing step. The surface properties and specific interaction between chitosan and palygorskite in the composites were the most critical factors that influenced their capabilities in removing toxic metals from water.

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Section: Adsorption Isothermmentioning

confidence: 98%

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Rusmin

Sarkar

Liu

et al. 2015

Applied Surface Science

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show abstract

“…As known, the adsorption capacity and removal rate are closely related to the performance of the adsorbent, so a large number of materials such as activated carbon [ 17 ], carbon nanotubes [ 18 ], natural or modified diatomite [ 19 ], chitosan (CS) [ 20 , 21 ] and synthetic mesoporous silica [ 22 ] have been explored widely for the removal of various pollutants.…”

Section: Introductionmentioning

confidence: 99%

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Fu¹,

Ying²,

Hu³

2018

R. Soc. open sci.

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A novel functional hybrid mesoporous composite material (CMP) based on chitosan and MCM-41-PAA was reported and its application as an excellent adsorbent for Hg(II) ions was also investigated. Innovatively, MCM-41-PAA was prepared by using diatomite and polyacrylic acid (PAA) with integrated polymer–silica hybrid frameworks, and then CMP was fabricated by introducing MCM-41-PAA to chitosan using glutaraldehyde as a cross-linking agent. The structure and morphology of CMP were characterized by X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis, scanning electron microscopy and Brunauer–Emmett–Teller measurements. The results showed that the CMP possessed multifunctional groups such as –OH, –COOH and –NH2 with large specific surface area. Adsorption behaviour of Hg(II) ions onto CMP was fitted better by the pseudo-second-order kinetic model and the Langmuir model when the initial Hg(II) concentration, pH, adsorption temperature and time were 200 mg l−1, 4, 298 K and 120 min, respectively, as the optimum conditions. The corresponding maximum adsorption capacity could reach 164 mg g−1. According to the thermodynamic parameters determined such as free energy, enthalpy and entropy, the adsorption process of Hg(II) ions was spontaneous endothermic adsorption.

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“…In addition, the peak at 471 cm À1 is associated with the asymmetric stretching mode of siloxane bonds. The peak at 796 cm À1 is also attributed to the vibration of O-H. 35,36 Nitrogen adsorption/desorption isotherms of the pristine diatomite nanoplatelets are presented in Figure 2. The shape of isotherm is similar to the type-IV isotherms according to the International Union of Pure and Applied Chemistry classification and confirms that diatomite has mesoporous structure.…”

Section: Resultsmentioning

confidence: 99%

“…[12][13][14][15][16] Due to these attractive features, diatomite is employed in various applications such as filtering-utility material, filling material, insulation material, adsorbent, abrasive material and surface cleaning material, catalyst carrier, light construction material, and silica source. 17,18 Although free radical polymerization can be performed in a mild reaction condition, it also has some deficiencies (e.g. lack of control over molecular weight, polymer composition, and end functionality).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of mesoporous diatomaceous earth particles on RATRP of styrene and butyl acrylate

Khezri

Alijani

Fazli

et al. 2018

Journal of Thermoplastic Composite Materials

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Mesoporous diatomite nanoplatelets were employed to prepare various poly (styrene-co-butyl acrylate)/diatomite nanocomposites by in situ reverse atom transfer radical polymerization of styrene and butyl acrylate. Fourier-transform infrared spectroscopy, thermogravimetric analysis (TGA), and nitrogen adsorption/desorption isotherm were employed for evaluating some properties of the pristine diatomite nanoplatelets. Evaluation of pore size distribution and morphological studies were also performed by scanning and transmission electron microscopy. Conversion and molecular weight determinations were carried out using gas and size exclusion chromatography, respectively. Addition of 3 wt% pristine mesoporous diatomite nanoplatelets leads to an increase in conversion from 77% to 92%. Molecular weight of poly (styrene-co-butyl acrylate) chains increases from 17,348 g mol−1 to 21,346 g mol−1 with the addition of 3 wt% pristine mesoporous diatomite nanoplatelets; however, polydispersity index values increases from 1.38 to 1.65. Increasing thermal stability of the nanocomposites is demonstrated by TGA. Differential scanning calorimetry shows an increase in glass transition temperature from 35.5°C to 39.4°C with the addition of 3 wt% mesoporous diatomite nanoplatelets.

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Uniform surface modification of diatomaceous earth with amorphous manganese oxide and its adsorption characteristics for lead ions

Cited by 45 publications

References 23 publications

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Investigation of the effect of mesoporous diatomaceous earth particles on RATRP of styrene and butyl acrylate

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