Source reduction, waste minimization, and cleaner technologies

Hussain, Chaudhery Mustansar; Paulraj, Mosae Selvakumar; Nuzhat, Samiha

doi:10.1016/b978-0-12-824320-6.00002-2

Cited by 20 publications

(5 citation statements)

References 101 publications

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“…Based on the molecular size and form of the solutes, ultrafiltration is a separation technology used to concentrate and separate the solutes . It is a type of membrane filtration that divides components in a liquid mixture using a semipermeable membrane with particular pore sizes .…”

Section: Methodsmentioning

confidence: 99%

“…Based on the molecular size and form of the solutes, ultrafiltration is a separation technology used to concentrate and separate the solutes. 26 It is a type of membrane filtration that divides components in a liquid mixture using a semipermeable membrane with particular pore sizes. 27 For ultrafiltration, two types of samples were subjected, lipase crude extract and the product solution obtained after ammonium sulfate precipitation.Then, a 10 kDa hollow fiber cellulose membrane equipped with a peristaltic pump was selected.…”

Section: Orange Peel Waste Preparationmentioning

confidence: 99%

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Simple and Efficient Process for Valorization of Orange Peel Waste for Isolation and Purification of Industrially Important Lipase

Sawarkar,

Pawar

2024

ACS Sustainable Resour. Manage.

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Lipase is an industrially important enzyme having a wide range of applications. The present study is focused on the development of a simple and efficient process for isolation and purification of lipase from orange peel waste. The proximate analysis of orange peel waste showed the presence of protein (8.83%) with lipolytic activity (6.11 U/mL). Thus, various commercially available extraction media were tested for the extraction of lipase. Of the tested extraction media, the use of ammonium chloride buffer showed the maximum lipase activity of 16.31 U/mL and specific activity of 231.40 U/mg. The process optimization study was conducted to obtain optimum parameters of extraction from maximum enzyme activity and enzyme specific activity. Under optimized conditions, maximum lipase activity of 49.32 U/mL and specific activity of 594.21 U/mg were obtained. The validation of the process optimization study by using ANNOVA showed the strong correlation between the experimental and predicted values with a significant P-value (< 0.005). Integration of ultrafiltration and adsorption significantly increases the purity by 1.4 fold with enzyme activity of 282.85 U/mL and enzyme specific activity of 890.85 U/mg. The characterization of obtained crude and purified lipase was conducted by using ATR-FTIR and SDS-PAGE. Thus, the present process provides a simple, economical, and industrially scalable approach for valorization of orange peel waste for isolation of the industrially important enzyme lipase.

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Section: Methodsmentioning

confidence: 99%

Section: Orange Peel Waste Preparationmentioning

confidence: 99%

Simple and Efficient Process for Valorization of Orange Peel Waste for Isolation and Purification of Industrially Important Lipase

Sawarkar,

Pawar

2024

ACS Sustainable Resour. Manage.

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“…6 In wastewater treatment, chemical processing, and food processing, UF membranes are frequently utilized. 7 While suspended particles and dissolved substances with high molecular weight are confined, water as well as other solutes with a small molecular weight pass past the barrier. The kind and size of pollutants removed are mostly determined by the pore size of an UF membrane, which varies between 0.002 and 0.1 μm in size.…”

Section: Introductionmentioning

confidence: 99%

“…Due to its pressure-driven nature and ability to retain organic, inorganic, and microbiological contaminants, ultrafiltration (UF) is recognized as a flexible technique . In wastewater treatment, chemical processing, and food processing, UF membranes are frequently utilized . While suspended particles and dissolved substances with high molecular weight are confined, water as well as other solutes with a small molecular weight pass past the barrier.…”

Section: Introductionmentioning

confidence: 99%

Poly(methyl vinyl ether-alt-maleic acid)-Coated Poly(ether ether) Sulfone Ultrafiltration Membranes Augmented with Silver Nanoparticles for the Removal of Proteins and Pesticides from Aqueous Solutions

Vaidyanathan,

Senthil Kumar,

George

et al. 2023

Ind. Eng. Chem. Res.

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The huge prevalence of pesticides in freshwater sources has led to a current demand for a modified polymer membrane with greater hydrophilic and antifouling qualities. Filtration of those pesticides using membranes remains a challenge due to fouling effects. Here, a ultrafiltration poly(ether ether) sulfone (PEES) polymer membrane was customized by the addition of a biocompatible poly(methyl vinyl ether-alt-maleic acid) (PMVEAMA) copolymer and by the inclusion of silver nanoparticles (AgNPs). The PEES/PMVEAMA/AgNPs polymer membrane was designed by the phase inversion method to efficiently separate proteins and pesticides. The synthesized membranes were characterized by scanning electron microscopy, X-ray diffraction, and attenuated total reflectance-Fourier transform infrared spectroscopy, which revealed the membranes' pore formation, functional group, and crystalline nature. The incorporation of 1.5 wt % AgNPs elevates the performance of the polymer membrane. The modified membrane exhibited a significant increase in contact angle (67°), water content (77%), porosity (83.9%), and flux (329 Lm −2 h −1 ). The PEES/PMVEAMA with 1.5 wt % AgNPs exhibited a molecular cutoff of 8000 Da and accelerated the rejection of pentachlorophenol from 49 to 69%. Meanwhile, the PEES/PMVEAMA/AgNPs hybrid membrane showed a flux recovery ratio of 93% for bovine serum albumin and 95% for pentachlorophenol. Significantly, the AgNPs-functionalized polymer membrane displayed reduced irreversible fouling (4.2% for pentachlorophenol and 6.2% for albumin). Thus, the current study provides a novel perspective that the integration of biobased PMVEAMA and Ag-NPs has enhanced the membrane's antifouling performance and hydrophilicity and also increased its separation of proteins and pesticides from aqueous solutions.

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“…These pollutants have been highly toxic and non-degradable over many years. Many traditional methods, such as thermal destruction [9], precipitation techniques [10], membrane separations [11] and ultra-filtration [12], were used for purifying industrial pollutants. In addition, absorbents such as activated carbons [13] and zeolites [14,15] were also used to remove the organic chemical contaminants.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide–Metal Oxide Nanocomposites (ZrO2 and Y2O3): Fabrication and Characterization for the Photocatalytic Degradation of Picric Acid

et al. 2022

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Herein, reduced graphene-oxide-supported ZrO2 and Y2O3 (rGO-ZrO2 and rGO-Y2O3) nanocomposites were synthesized by hydrothermal method and used as the catalysts for photodegradation of picric acid. The structural and morphological properties of the synthesized samples were characterized by using an X-ray diffractometer (XRD), scanning electron microscope (SEM) with energy dispersive absorption X-ray spectroscopy (EDAX), UV-Vis spectrophotometer, Raman spectrophotometer and Fourier transformation infrared spectrophotometer (FT-IR) techniques. In this work, the wide band gap of the ZrO2 and Y2O3 was successfully reduced by addition of the reduced graphene oxide (rGO) to absorb visible light for photocatalytic application. The performance of as synthesized rGO-ZrO2 and rGO-Y2O3 nanocomposites in the photocatalytic degradation of picric acid were evaluated under UV light irradiation. The photodegradation study using picric acid was analyzed with different energy light sources UV (254, 365 and 395 nm), visible light and sunlight at different pH conditions (pH = 3, 7 and 10). The photocatalytic activity of rGO-ZrO2 and rGO-Y2O3 nanocomposites showed excellent photocatalytic activity under optimum identical conditions with mild variations in pH 3. Compared to rGO-Y2O3, the rGO-ZrO2 nanocomposite showed a better action, with a degradation percentage rate of 100, 99.3, 99.9, 100 and 100% for light conditions of UV-252, 365, 395, visible and sunlight, respectively. The excellent degradation efficiency is attributed to factors such as oxygen-deficient metal oxide phase, high surface area and creation of a greater number of hydroxyl groups.

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Source reduction, waste minimization, and cleaner technologies

Cited by 20 publications

References 101 publications

Simple and Efficient Process for Valorization of Orange Peel Waste for Isolation and Purification of Industrially Important Lipase

Simple and Efficient Process for Valorization of Orange Peel Waste for Isolation and Purification of Industrially Important Lipase

Poly(methyl vinyl ether-alt-maleic acid)-Coated Poly(ether ether) Sulfone Ultrafiltration Membranes Augmented with Silver Nanoparticles for the Removal of Proteins and Pesticides from Aqueous Solutions

Reduced Graphene Oxide–Metal Oxide Nanocomposites (ZrO2 and Y2O3): Fabrication and Characterization for the Photocatalytic Degradation of Picric Acid

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