Synthesis, characterization and application of polyacrylamide grafted bioflocculant

ngema, siyanda; Basson, Albertus K.; Maliehe, Tsolanku Sidney

doi:10.1016/j.pce.2019.102821

Cited by 29 publications

(20 citation statements)

References 42 publications

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“…Each flocculant flocculates maximally at the optimum dosage. Below this dosage, significant bridging cannot occur between flocculants and colloids [5]. Contrary to this, beyond optimal dosage size, flocculation activity declines due to flocs being destabilize by excess flocculant.…”

Section: Discussionmentioning

confidence: 91%

“…Even though the chemical flocculants exhibit all these remarkable capabilities, in some developed countries these flocculants were banned due to the detrimental effect they possess to human, animals, and the environment [4]. The chemical flocculant shortcomings among others, include non-degradability and toxicity [5]. Recently, most emphasis is given to naturally occurring flocculants called "bioflocculants" as alternative agents to remove pollutants in wastewater, particularly biological oxygen demand, chemical oxygen demand, and sulfur.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Application of FeCu Bimetallic Nanoparticles in Coal Mine Wastewater Treatment

2021

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Wastewater treatment has become a global challenge with wastewater treatment cost fast increasing. Industrial processes such as downstream processes, wastewater treatment, and several fermentation processes depend largely on the use of flocculants. Synthetic flocculants, which are conventionally used in wastewater treatment, are hazardous to the environment and are carcinogenic to human health. Therefore, bioflocculants can be used as an alternative due to their biodegradable and environmentally friendly nature. However, low efficacy hinders their industrial application. This necessitates the need for a new technology to combat wastewater treatment challenges. Nanotechnology provides the platform to explore the possible solutions to these problems. The combination of two different metals results in the formation of bimetallic nanoparticles (BNPs). Due to better properties, bimetallic nanoparticles have attracted huge attention as compared to monometallic nanoparticles from both technological and scientific views. Iron copper bimetallic nanoparticles (FeCu BNPs) were successfully stabilized by bioflocculant and used in the coal mine wastewater treatment. Infrared spectrometric analysis showed the presence of carboxyl (COO−), hydroxyl (−OH), and amino (−NH2) functional groups. SEM images showed irregular and crystalline like morphology. Meanwhile, TEM analysis revealed chain like agglomerated nanoparticles. FeCu BNPs exhibited a wide pH stability range from 3, 7, and 11 with 99% flocculation activity at pH 7 and at lowest dosage of 0.2 mg/mL. After treating wastewater, the FeCu BNPs could remove pollutants such as phosphate, sulfate, calcium, chemical oxygen demand (COD), and biological oxygen demand (BOD) with phosphate having the highest removal efficacy of 99%.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Synthesis and Application of FeCu Bimetallic Nanoparticles in Coal Mine Wastewater Treatment

2021

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“…Fourier transform-infrared spectrophotometer (FT-IR) (PerkinElmer UATR TWO, 2000; Germany) was used to ascertain the different functional groups within the fungal extract. The extract was grinded with KBr at 25 • C and assessed at a wavenumber ranging from 4000 to 400 cm −1 [29].…”

Section: Assessment Of Functional Groupsmentioning

confidence: 99%

Antibacterial Effect and Mode of Action of Secondary Metabolites from Fungal Endophyte Associated with Aloe ferox Mill

Maliehe

Mbambo

Nqotheni

et al. 2022

Microbiology Research

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The constant increase in drug resistance, occurrence of incurable diseases and high medical costs, have necessitated bio-prospecting of fungi as alternative sources of therapeutic compounds. This study aimed at assessing the antibacterial effect and mode of action of secondary metabolites from fungal endophyte associated with Aloe ferox Mill. Endophytic fungus was isolated from the gel of A. ferox and identified by internal transcribed spacer (ITS) rRNA gene sequence analysis. The targets of antibacterial activity were assessed based on minimum inhibitory concentration (MIC) and the effect of the extract on respiratory chain dehydrogenase (RCD) and membrane integrity. Fourier transform-infrared spectrophotometer (FTIR) was employed to ascertain functional groups. The fungus with the most promising antibiotic-production was identified as Aspergillus welwitschiae MK450668.1. Its extract exhibited antibacterial activity with the MIC values of 0.5 and 1 mg/mL against Staphylococcus aureus (ATCC 25925) and Escherichia coli (ATCC 25922). It demonstrated the inhibitory effect on the RCD activity and destruction of membrane integrity on the test bacteria. FTIR spectrum revealed hydroxyl, amine and alkene groups. A. welwitschiae MK450668.1 serves as a potential source of effective compounds to combat the challenge of drug resistance.

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“…In fact, bioflocculants were actively researched in recent years for micro‐ or macro‐sized suspended solid removal 73, 75. On the other hand, an innovative approach using grafted copolymer flocculants such as combining starch and acrylamide proved to have better flocculation properties than the conventional flocculant 76, 77. Despite that, the available studies showing their ability to separate nano‐scaled particles remain limited and thus worth for further investigation.…”

Section: Challenges and Future Outlooksmentioning

confidence: 99%

Separation of Nano‐scaled Particles by Flocculation

2021

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Owing to the increased application of nanoparticles in engineering industries, the development of separation techniques to isolate nanoparticles grew as important as the one to isolate micro‐ or macro‐sized particles. Centrifugation, filtration, and precipitation are the common processes used to separate nanoparticles from a suspension. Interestingly, these processes work best if the nanoparticles are preflocculated into a larger cluster. Flocculation of nanoparticles may involve a complex mechanism affected by the physicochemical and molecular properties of the flocculant. A review of the effects induced by these factors on the flocculation of nanoparticles is given. The applications of advanced flocculation approaches as well as the research gaps in this research area are discussed.

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Synthesis, characterization and application of polyacrylamide grafted bioflocculant

Cited by 29 publications

References 42 publications

Synthesis and Application of FeCu Bimetallic Nanoparticles in Coal Mine Wastewater Treatment

Synthesis and Application of FeCu Bimetallic Nanoparticles in Coal Mine Wastewater Treatment

Antibacterial Effect and Mode of Action of Secondary Metabolites from Fungal Endophyte Associated with Aloe ferox Mill

Separation of Nano‐scaled Particles by Flocculation

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