Ultraviolet-assisted synthesis of polyacrylamide-grafted chitosan nanoparticles and flocculation performance

Ma, Jie; Fu, Kun; Shi, Jun; Sun, Yongjun; Zhang, Xinxi; Ding, Lei

doi:10.1016/j.carbpol.2016.06.002

Cited by 79 publications

(24 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, all three lentil extracts exhibited same rough surface with pores and obvious surface abrasions. Zheng et al [12] and J. Ma et al [13] claimed the presence of pores at the surface of biopolymer reveal the good flocculating properties of the material as it aided in the particle adsorption and bringing processes. Comparing at magnification of 1000 times, red lentil extract granules have the largest particle size, followed by green lentil, while brown lentil extract granules have the smallest average particle size.…”

Section: Surface Morphology Of the Lentilsmentioning

confidence: 99%

Red Lentil (Lens culinaris) Extract as a Novel Natural Coagulant for Turbidity Reduction: An Evaluation, Characterization and Performance Optimization Study

Chua

Malek

Kait

et al. 2019

Water

View full text Add to dashboard Cite

Increasing awareness on the detrimental effects of inorganic chemical coagulants and sustainable treatment have paved the way to develop environmentally-benign natural coagulants for water and wastewater treatment. In this research, brown, green, and red lentil (Lens culinaris) extracts have been evaluated as a natural coagulant for the turbidity reduction. The physicochemical characteristics properties of lentil extract were evaluated through field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), zeta potential analysis, and energy-dispersive X-ray (EDX) analysis. Red lentil extract was found to be an anionic polymer with hydroxyl and carboxyl functional groups. The effects of three major operating parameters, pH, the concentration of coagulant, and settling time, were studied and optimized through response surface methodology (RSM) using the Box–Behnken Design (BBD). The red lentil extract as coagulant was outperformed alum in acidic wastewater treatment, which achieved up to 98.87% turbidity removal with an optimum concentration of 26.3 mg/L in 3 min. Besides, the red lentil extract as coagulant reduced 29.42% of material cost, generated 15.6% lower amount of sludge and produced flocs with better settling characteristic (SVI: 7.39) as compared to alum. Based on the experimental observation and characterization study, absorption and bridging mechanisms were proposed for red lentil extract as the coagulant in turbidity reduction.

show abstract

Section: Surface Morphology Of the Lentilsmentioning

confidence: 99%

Red Lentil (Lens culinaris) Extract as a Novel Natural Coagulant for Turbidity Reduction: An Evaluation, Characterization and Performance Optimization Study

Chua

Malek

Kait

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…The first weight loss of 19.7% in the range of 25°C-192°C could be due to the evaporation of trapped and physisorbed water molecules from samples [9]. The weight loss of 21.6% was observed by heating from 192°C-317°C, which might be attributed to the thermal decomposition of functional groups such as -OH on the backbone of the hydrogels [35]. The hydrogel weight decreased gradually when the temperature exceeded 317°C, which was mainly assigned to the further the thermal degradation of the backbone chain [34].…”

Section: Data Modelingmentioning

confidence: 97%

Temperature-induced adsorption and desorption of phosphate on poly(acrylic acid-co-N-[3-(dimethylamino)propyl]acrylamide) hydrogels in aqueous solutions

BaiYou¹,

Luo²,

Rong³

et al. 2019

DWT

View full text Add to dashboard Cite

We explore the feasibility of using thermosensitive hydrogels based on copolymers of acrylic acid (AAC) and N-[3-(dimethylamino)propyl] acrylamide (DMAPAA) [P(AAC-co-DMAPAA)] for adsorption and desorption of phosphate in aqueous solutions by a temperature swing. The hydrogels were protonated when they swelled in acidic solution at room temperature, exhibiting good adsorption capacity of phosphate. The phosphate ions were desorbed at high temperature due to the ionic repulsion of carboxyl groups caused by the dissociation of hydrogen bonding. The hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The effects of solution pH and temperature on phosphate removal were investigated. Kinetic data revealed that the adsorption of phosphate fitted the pseudo-first-order model. Isotherm data showed that the Freundlich model was more suitable than the Langmuir model. Effective desorption of phosphate was observed by raising the solution temperature to 55°C, and repeated adsorption and desorption behaviors were achieved within three consecutive cycles by a temperature swing between 25°C and 55°C. These findings suggest the possible phosphate removal and recovery from aqueous solutions by changing the environmental temperature.

show abstract

“…The first endothermic peak observed at 30-200 • C was due to the evaporation of P(AM-DMD), and the second endothermic peak observed at 200-350 • C was due to the P(AM-DMDAAC) oxidation decomposition [49]. The TGA curves showed that with the increase in temperature, the mass changed at three points, namely, 30-200 • C with weight loss of approximately 7.28% due to the evaporation of P(AM-DMDAAC), 200-350 • C with weight loss of approximately 24.78% due to the amide-imide reaction and quaternary ammonium base on the methyl group and hydrogen chloride loss, and 350-600 • C with weight loss of approximately 47.09% due to the main chain rupture and full decomposition of the polymer [50,51]. Therefore, the DTA and TGA curves showed that the MV-assisted preparation of P(AM-DMDAAC) in normal temperature conditions was extremely stable, and decomposition would not occur under normal operating conditions.…”

Section: Infrared Spectrum Of P(am-dmdaac)mentioning

confidence: 99%

Characterization and Dimethyl Phthalate Flocculation Performance of the Cationic Polyacrylamide Flocculant P(AM-DMDAAC) Produced by Microwave-Assisted Synthesis

Zhang

Zhao

2020

Molecules

View full text Add to dashboard Cite

A composite flocculant P(AM–DMDAAC) was synthesized by the copolymerization of acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC). By using microwave (MV) assistance with ammonium persulfate as initiator, the synthesis had a short reaction time and yielded a product with good solubility. Fourier-transform infrared spectroscopy, scanning electron microscopy, and differential thermal analysis–thermogravimetric analysis were employed to determine the structure and morphology of P(AM–DMDAAC). The parameters affecting the intrinsic viscosity of P(AM–DMDAAC), such as MV time, mass ratio of DMDAAC to AM, bath time, reaction temperature, pH value, and the dosages of ammonium persulfate initiator, EDTA, sodium benzoate, and urea were examined. Results showed that the optimum synthesis conditions were MV time of 1.5 min, m(DMDAAC):m(AM) of 4:16, 0.5 wt‰ initiator, 0.4 wt‰ EDTA, 0.3 wt‰ sodium benzoate, 2 wt‰ urea, 4 h bath time, reaction temperature of 40 °C, and pH of 2. The optimal dimethyl phthalate (DMP) removal rate can reach 96.9% by using P(AM–DMDAAC), and the P(AM–DMDAAC) had better flocculation than PAM, PAC, and PFS.

show abstract

Ultraviolet-assisted synthesis of polyacrylamide-grafted chitosan nanoparticles and flocculation performance

Cited by 79 publications

References 53 publications

Red Lentil (Lens culinaris) Extract as a Novel Natural Coagulant for Turbidity Reduction: An Evaluation, Characterization and Performance Optimization Study

Red Lentil (Lens culinaris) Extract as a Novel Natural Coagulant for Turbidity Reduction: An Evaluation, Characterization and Performance Optimization Study

Temperature-induced adsorption and desorption of phosphate on poly(acrylic acid-co-N-[3-(dimethylamino)propyl]acrylamide) hydrogels in aqueous solutions

Characterization and Dimethyl Phthalate Flocculation Performance of the Cationic Polyacrylamide Flocculant P(AM-DMDAAC) Produced by Microwave-Assisted Synthesis

Contact Info

Product

Resources

About