A novel cross-linked pH-responsive tetrapolymer: Synthesis, characterization and sorption evaluation towards Cr(III)

Saleh, Tawfik A.; Haladu, Shamsuddeen A.; Ali, Shaikh A.

doi:10.1016/j.cej.2015.01.083

Cited by 34 publications

(20 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The details of the three types of mechanisms are in Supporting Information (see S1 Mechanisms of intra-particle diffusion model in Supplementary Material available online at http://dx.doi.org/10.1155/ 2016/3069754). Figure 2(a) shows that the adsorption of Cr(III) onto kaolin in both single and binary solutions involved all three diffusion steps, which is consistent with the result of Saleh et al [31]. However, in both single and binary solutions, kaolin adsorption of Cr(VI) involved only film diffusion and pore diffusion mechanisms (Figure 2(b)), which agrees with the results of Gan et al [22].…”

Section: Adsorption Kinetics Modelssupporting

confidence: 89%

“…Removal. The solution's pH is considered to be an important parameter in heavy metal adsorption, as the pH values can affect the speciation of metal ions and the surface properties of adsorbents [12,31]. The adsorption capacities ( ) of Cr(III) in the absence and presence of Cu(II) increased with pH (pH 2.0-7.0), as shown in Figure 4(a).…”

Section: Effects Of Ph On Cr(iii)mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Liu

et al. 2016

Journal of Chemistry

View full text Add to dashboard Cite

The adsorption of Cr(III) or Cr(VI) in the absence and presence of Cu(II) onto kaolin was investigated under pH 2.0–7.0. Results indicated that the adsorption rate was not necessarily proportional to the adsorption capacity. The solutions’ pH values played a key role in kaolin zeta potential(ζ), especially the hydrolysis behavior and saturation index of heavy metal ions. In the presence of Cu(II),qmixCr(III)reached the maximum adsorption capacity of 0.73 mg·g−1at pH 6.0, while the maximum adsorption capacity for the mixed Cr(VI) and Cu(II) system (qmixCr(VI)) was observed at pH 2.0 (0.38 mg·g−1). Comparing the adsorption behaviors and mechanisms, we found that kaolin prefers to adsorb hydrolyzed products of Cr(III) instead of Cr3+ion, while adsorption sites of kaolin surface were occupied primarily by Cu(II) through surface complexation, leading to Cu(II) inhibited Cr(VI) adsorption. Moreover, Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKd. Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKdand that of adsorption affinities of Cr(III) or Cr(VI) on kaolin was found to beKdCr(III) <KdCr(III)-Cu(II) andKdCr(VI) >KdCr(VI)-Cu(II).

show abstract

Section: Adsorption Kinetics Modelssupporting

confidence: 89%

Section: Effects Of Ph On Cr(iii)mentioning

confidence: 99%

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Liu

et al. 2016

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…The adsorption isotherms provide fundamental physico-chemical data for evaluate the adsorptive capacity of an adsorbent [ 36 ]. The isotherms obtained for the three temperatures studied (298 K, 308 K and 318 K) and theoretical models of isotherms can be seen in Figure 9 .…”

Section: Resultsmentioning

confidence: 99%

Direct Modification of Microcrystalline Cellulose with Ethylenediamine for Use as Adsorbent for Removal Amitriptyline Drug from Environment

Bezerra

Leal

Silva³

et al. 2017

Molecules

View full text Add to dashboard Cite

Cellulose derivatives have been widely used as adsorbents for the removal of micropollutants such as drugs, dyes, and metals, due to their abundance, low cost and non-contaminating nature. In this context, several studies have been performed searching for new adsorbents (cellulose derivatives) efficient at contaminant removal from aqueous solutions. Thus, a new adsorbent was synthesized by chemical modification of cellulose with ethylenediamine in the absence of solvent and applied to the adsorption of amitriptyline (AMI) in aqueous solution. The modification reaction was confirmed by X-ray Diffraction (XRD), elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry/Differential Scanning Calorimeter (TG/DSC), solid state Nuclear Magnetic Resonance of 1H and 13C (1H-NMR and 13C-NMR). Moreover, the effectiveness of reaction was confirmed by computational calculations using Density Functional Theory (DFT) at level B3LYP/6-31G(d). This adsorption process was influenced by pH, time, concentration, temperature and did not show significant changes due to the ionic strength variation. Through these experiments, it was observed that the maximum adsorption capacity of AMI by CN polymer at 298 K, 300 min, and pH 7 was 87.66 ± 0.60 mg·g−1.

show abstract

“…Thermogravimetric analysis (Figure b) shows three major losses in weight. The first slow weight loss of 15% is due to the loss of water embedded inside the polyurea nearly at 120°C, whereas the second and third losses approximately at 300°C and 550°C refer to the combustion of nitrogenous organic fractions present in the polymer with the release of CO 2 , NO x , and H 2 O species . Elemental analysis confirmed the composition of PUCorr‐1 to be C, N, and O, whereas XRD revealed a broad peak characteristic of amorphous materials (Figure S1).…”

Section: Resultsmentioning

confidence: 98%

Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material

Abdulazeez

Hamouz

Khaled

et al. 2019

Materials & Corrosion

View full text Add to dashboard Cite

Oil well acidizing is a common practice used to boost oil well productivity in the industry. This practice, however, exposes the mild steel components of the wells to extremely harsh corrosive environments. Under such conditions, highly efficient inhibitors are used to minimize corrosion attack. In the present study, corrosion inhibition of mild steel in simulated acidic medium saturated with CO2 and H2S gases by a newly synthesized polyurea‐based material (PUCorr‐1) was investigated. Electrochemical studies supported with quantum chemical density‐functional theory calculations and surface characterization revealed that PUCorr‐1 adsorbs onto mild steel through a chemisorption mechanism yielding a stable protective film. The polyurea exhibited an excellent efficiency of 99.9% at a temperature of 50°C and a low concentration of 100 ppm, yielding a corrosion current density of 0.3 µA/cm2. In the presence of CO2 and H2S gases, PuCorr‐1 exhibited a remarkable performance (>93% efficiency) making it a potential corrosion inhibitor in industrial processes that involve the use of acid solutions in the presence of CO2 and H2S gases.

show abstract

A novel cross-linked pH-responsive tetrapolymer: Synthesis, characterization and sorption evaluation towards Cr(III)

Cited by 34 publications

References 46 publications

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Direct Modification of Microcrystalline Cellulose with Ethylenediamine for Use as Adsorbent for Removal Amitriptyline Drug from Environment

Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material

Contact Info

Product

Resources

About

A novel cross-linked pH-responsive tetrapolymer: Synthesis, characterization and sorption evaluation towards Cr(III)

Cited by 34 publications

References 46 publications

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Direct Modification of Microcrystalline Cellulose with Ethylenediamine for Use as Adsorbent for Removal Amitriptyline Drug from Environment

Inhibition of mild steel corrosion in CO2 and H2S‐saturated acidic media by a new polyurea‐based material

Contact Info

Product

Resources

About

Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material