Modification of zeolite 4A for use as an adsorbent for glyphosate and as an antibacterial agent for water

Zavareh, Siamak; Farrokhzad, Zahra; Darvishi, Farshad

doi:10.1016/j.ecoenv.2018.02.043

Cited by 114 publications

(63 citation statements)

References 42 publications

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“…50 mL of a BTB/NaOH solution with 1000 mg/L and a certain quality (100, 200, 300, 400, 500, or 600 mg) of QCF were stirred in a magnetic stirring water bath at 200 rpm for 4 h at different temperatures (303.15, 313.15, or 323.15 K) to study the adsorption isotherm. Langmuir [32], Freundlich [33] and Temkin [34] isotherms were applied to analyze the experiment data and to help understand the adsorption process. The adsorption isotherm models can be represented as:C e /q e = 1/(K L q m ) + C e /q m q e = K f × C e 1/n q e = A + B × lnC e where q m (mg/g) is the maximum adsorption capacity, q e (mg/g) is the equilibrium adsorption capacity, C e (mg/L) represents the concentration of the BTB/NaOH solution at equilibrium, and K L (L/mg) denotes the Langmuir adsorption constant.…”

Section: Methodsmentioning

confidence: 99%

In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption

et al. 2018

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In-situ pH-sensitive cellulose fibers (IS-pH-SCF) were prepared by anchoring bromothymol blue (BTB) onto cellulose fibers (CF) modified with hydroxypropyltriethylamine (HPTTL) groups. Fourier transform infrared and X-ray photoelectron spectrum analyses demonstrated that the HPTTL groups were grafted onto the CF. X-ray diffraction proved that cellulose I in the CF transformed into cellulose II after quaternization. Scanning electron microscopy suggested that the quaternized CF (QCF) surface was clean and uniformly ridged. The adsorption of BTB onto QCF was carried out via batch adsorption experiments. A kinetic study illustrated that the adsorption was a spontaneous process and described well by pseudo-second-order, Freundlich and Temkin isotherms. The activation energy for the BTB adsorption onto QCF was 52.89 kJ/mol, which proved that the BTB adsorption onto QCFs was chemically controlled. The pH response demonstrated that the IS-pH-SCF was highly sensitive to pH, with an obvious color change for pH 4 to 8. The release tests showed that BTB was anchored on QCFs and that no BTB was released. IS-pH-SCF has a potential use for indicating pH changes in food.

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Section: Methodsmentioning

confidence: 99%

In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption

et al. 2018

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“…For synthesized Zeolite 4A nanocrystals, a broad peak at 3450 cm −1 corresponds to the ─OH group of absorbed moisture or water content and another peak at 1650 cm −1 belongs to bending vibration of ─OH group. The main characteristic peaks at 1004 cm −1 (stretching vibration mode of Si─O and Al─O), 466 cm −1 (bending vibration of Si─O─Al), and 551 cm −1 (vibration modes of zeolite framework) were assigned for the Zeolite 4A . In neat PDMS membranes, strong FTIR‐ATR bands at 800 cm −1 (Si─O─Si symmetric stretching), 1020–1090 cm −1 (Si─O─Si asymmetric stretching), and 1252 cm −1 (Si─CH 3 units) were observed …”

Section: Resultsmentioning

confidence: 99%

High oxygen permeable Zeolite‐4A poly(dimethylsiloxane) membrane for air separation

Prajapati

Kansara

Aswal

et al. 2019

J of Applied Polymer Sci

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High oxygen permeability with optimal selectivity of the membrane is required for advancement in air separation membrane technology. Zeolite 4A-PDMS composite membranes were prepared by incorporation of Zeolite 4A nanoscale crystals during the polymerization process of PDMS membrane using toluene and n-heptane solvents, and their oxygen gas permeability and selectivity were explored. Small angle neutron scattering (SANS) technique was further used to study the polymer chain conformation and structure of membranes influenced by Zeolite 4A loading. The intersegmental distance between polymer chains and polymer chain aggregation or clustering were found to be increased on increasing the Zeolite 4A content in the membranes. Increment in the O 2 permeability and O 2 /N 2 selectivity were observed for both type of membranes (toluene and n-heptane) with 1 wt% Zeolite 4A loading. The best performance result with O 2 /N 2 selectivity of 2.6, and O 2 permeability of 1052 Barrer was exhibited by PDMS/toluene membrane loaded with 1 wt% Zeolite 4A. The PDMS/toluene membranes with 10 wt% Zeolite 4A loading exhibited increased O 2 permeability of 1245 Barrer with a fair O 2 /N 2 selectivity of~1.7, while the PDMS/n-heptane membrane with the same loading exhibited excellent O 2 permeability of 6773 Barrer but lesser O 2 /N 2 selectivity of~1.2.

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“…The XRD of 4A zeolite and 60%TEPA-4A shown in Figure 2A, [32] while the characteristic peak of 60%TEPA-4A was not significantly different, but the intensity of each peak changed so that TEPA did not alter the structure of the 4A zeolite but was supported on the surface of the 4A zeolite by electrostatic attraction. This result was consistent with the SEM results.…”

Section: Physicochemical Properties Of Adsorbentsmentioning

confidence: 96%

Preparation of Tetraethylenepentamine‐Functionalized 4A Zeolite for effective removal of phosphate in water

Guan

Deng

Zhang

et al. 2020

Applied Organom Chemis

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Recently, the high‐concentration phosphorus‐containing wastewater has been caused lots of negative influences on aquatic environment and thus driven people to develop some effective methods to remove excess of phosphate in water. In order to solve these environmental problem, in this work, a tetraethylenepentamine (TEPA) modified 4A zeolite has been prepared and used for removing phosphate. Removal of phosphate by precipitation of 4A zeolite and electrostatic action of TEPA with phosphate were determined by scanning electron microscopy, X‐ray powder diffraction and Fourier infrared spectrum, and morphology and characteristic peak of TEPA‐4A zeolite before and after adsorption changed significantly. In addition, the results of batch adsorption studies showed that the pH of the solution have a significant influence on the adsorption of TEPA‐4A and the biggest adsorption capacity was 23 mg/g at pH = 2.3 ± 0.2. Adsorption isotherms results showed that the process was consistent with Langmuir model and the maximum adsorption capacity could reach to 28 mg/g at 25 °C. TEPA‐4A adsorption processes were spontaneous endothermic reaction, and elevated temperatures were conducive to the adsorption process through kinetics and thermodynamics results. The research of TEPA modified 4A zeolite and raw 4A zeolite provides technical support for the development of 4A zeolite instead of sodium tripolyphosphate as a new type of detergent ingredient.

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Modification of zeolite 4A for use as an adsorbent for glyphosate and as an antibacterial agent for water

Cited by 114 publications

References 42 publications

In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption

In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption

High oxygen permeable Zeolite‐4A poly(dimethylsiloxane) membrane for air separation

Preparation of Tetraethylenepentamine‐Functionalized 4A Zeolite for effective removal of phosphate in water

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