Fabrication of a copolymer flocculant and application for Cr(VI) removal

You, Lijun; Song, Lidao; Lu, Fu-Hsing; Zhang, Qiqing

doi:10.1002/pen.24354

Cited by 15 publications

(8 citation statements)

References 51 publications

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“…Langmuir and Freundlich isotherm was used to study the correlation of the equilibrium data and the system. The Langmuir isotherm is used to study the monolayer adsorption and it was calculated using the equation given below :

\frac{C_{normale}}{q_{normale}} = ((), \frac{1}{K_{normalL q_{m}}}) + ((), \frac{1}{q_{m}}) C_{e},

where K L and q m are the Langmuir isotherm constant (L/mg) and adsorption capacity (mg/g), respectively. This can also be expressed as dimensionless constant separation factor ( R L ).…”

Section: Resultsmentioning

confidence: 95%

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Screening and optimization through response surface methodology for synthesis of pH, temperature and salt‐sensitive Aloe vera–acrylic acid‐based biodegradable hydrogel: Its evaluation as dye adsorbent

Kumar

Rehani

Saruchi

et al. 2019

Polymer Engineering & Sci

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A pH‐, temperature‐, and salt‐sensitive hydrogel was synthesized using acrylic acid (AA) as monomer, natural polysaccharide Aloe vera as backbone, ammonium persulfate–N,N‐methylene‐bis‐acrylamide as an initiator–crosslinker system via free‐radical grafting method. Different parameters such as treatment time, temperature, amount of solvent, pH, concentration of initiator, crosslinker and monomer were screened using Plackett–Burman design (PBD). The PBD showed that pH, monomer, and crosslinker were taken as the most important variables, which highly impact the swelling behavior of the synthesized hydrogel as compared to the rest of the variables. The half normality plot was used to find the significant parameters regarding the swelling capacity of the hydrogel. The center composite design was used for further optimizing the important variables like pH, monomer, and crosslinker. The pH and monomer interaction on percentage swelling (Ps) was studied through the analysis of variance model. Synthesized hydrogel Av‐cl‐poly(AA) was characterized by different techniques such as Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction, and scanning electron microscopy (SEM). The effect of different chloride salt solutions like KCl, NaCl, BaCl2, FeCl3, and CoCl3·6H2O on Ps of synthesized Av‐cl‐poly(AA)‐based hydrogel was also studied. Biodegradation studies of the synthesized polymer were also carried out using soil burial and vermicompositing methods. Biodegradation of semi interpenetrating polymer network (SIPN) was confirmed by SEM and FTIR techniques. Synthesized SIPN was also used as a device for the removal of dye and was found very effective as an adsorbent. POLYM. ENG. SCI., 59:2323–2334, 2019. © 2019 Society of Plastics Engineers

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\frac{C_{normale}}{q_{normale}} = ((), \frac{1}{K_{normalL q_{m}}}) + ((), \frac{1}{q_{m}}) C_{e},

where K L and q m are the Langmuir isotherm constant (L/mg) and adsorption capacity (mg/g), respectively. This can also be expressed as dimensionless constant separation factor ( R L ).…”

Section: Resultsmentioning

confidence: 95%

Section: Adsorption Isothermmentioning

confidence: 99%

Screening and optimization through response surface methodology for synthesis of pH, temperature and salt‐sensitive Aloe vera–acrylic acid‐based biodegradable hydrogel: Its evaluation as dye adsorbent

Kumar

Rehani

Saruchi

et al. 2019

Polymer Engineering & Sci

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“…According to Lagergren, the rate of metal ion adsorption to the polymer adsorbent depends on the adsorption capacity. For the rate studies, the nonlinear expression of the pseudo first‐order equation as given below was used:

\frac{{italicdq}_{t}}{dt} = k_{1} ((), q_{e} - q_{t})

Linearised form is:

\ln ((), q_{e} - q_{t}) = \ln q_{e} - k_{1} t

where q t is the amount of metal ion adsorbed in millimol per gram at time t in minutes and k 1 in min −1 is the rate constant of first‐order adsorption. The value of k 1 for each metal ion complexation was calculated from the respective plot of ln (q e ‐ q t ) versus t .…”

Section: Resultsmentioning

confidence: 99%

Studies on the Complexation of 3d Transition Metal Ions with NR/PEO Block Copolymer in Aqueous Medium

Mrudula

Nair

2020

Polymer Engineering & Sci

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Polyethylene oxide (PEO) was chemically linked to natural rubber (NR) segments to form a block copolymer (BC), which proved to be a suitable material for complexing with selected first row transition metal ions in aqueous solution through batch adsorption method under noncompetitive mode. Optimum conditions for sorption were found to be 20 mmol/L initial concentration, pH at 6, ambient temperature, and 24 h. The order of decreasing adsorption capacity obtained is Mn(II) > Co(II) > Zn(II) > Ni(II) > Cu(II) > Fe(III). Freundlich isotherm shows the best fit indicating that the adsorption is of heterogeneous in nature. The complexation follows pseudo second‐order kinetics. Exothermic character of the complexation was confirmed by thermodynamic study. For all metal ions, the standard free energy change values are negative for the different temperatures studied, which confirms the spontaneous character of the process. At ambient temperature, the free energy change lies between −2.35 and − 7.83 kJ/mol for all complexes. Values of activation energy for all the metal ion complexation is within the range 11–25 kJ/mol, which indicates chemical interaction via activated physico–chemical adsorption. Variation in stability constant of the complexes also follows the same order as given above. POLYM. ENG. SCI., 60:661–672, 2020. © 2020 Society of Plastics Engineers

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“…Modification of such polymer materials through derivatization reactions such as methylolation, acylation, and carboxylation can significantly improve their removal effect on heavy metals [25]. You et al [26] prepared a copolymer flocculant derived from starch and chitosan, and also used it as an environmentally friendly adsorbent, with a removal rate of Cr 6+ in aqueous solutions up to 90%. Lin Meiying et al [27] prepared amino modified starch AMS by emulsion polymerization.…”

Section: Treatment Of Heavy Metal Wastewatermentioning

confidence: 99%

Progress in Research and Application of Natural Polymer Coagulants

2020

E3S Web Conf.

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In recent years, natural polymer coagulant has become a hot spot in the field of coagulants due to its safety, harmlessness and biodegradability. This paper introduced the status quo of research of natural polymer coagulants such as starch, chitosan, cellulose and lignin coagulants. And some hot applications in water treatment were discussed, such as heavy metal wastewater, dye wastewater, microalgae collection and sludge dewatering. Finally, the development trend of natural polymer coagulants was prospected.

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Fabrication of a copolymer flocculant and application for Cr(VI) removal

Cited by 15 publications

References 51 publications

Screening and optimization through response surface methodology for synthesis of pH, temperature and salt‐sensitive Aloe vera–acrylic acid‐based biodegradable hydrogel: Its evaluation as dye adsorbent

Screening and optimization through response surface methodology for synthesis of pH, temperature and salt‐sensitive Aloe vera–acrylic acid‐based biodegradable hydrogel: Its evaluation as dye adsorbent

Studies on the Complexation of 3d Transition Metal Ions with NR/PEO Block Copolymer in Aqueous Medium

Progress in Research and Application of Natural Polymer Coagulants

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