Decolorisation of effluent with ozone and re-use of spent dyebath

Hassan, Mohammad Mahbubul; Hawkyard, Christopher J.

doi:10.1533/9781845693091.149

Cited by 12 publications

(3 citation statements)

References 79 publications

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“…The half-life of ozone gas is very limited (less than a few minutes) and therefore ozone is needed to be generated on-site [32]. Moreover, ozone gas has very poor solubility in water and therefore spargers are used to enhance the transfer of ozone to water [33]. The chlorine-Hercosett treatment machine can be used for the ozone/Hercosett treatment of wool with some modifications.…”

Section: Shrink-resist Treatments Used In the Wool Industrymentioning

confidence: 99%

A review of the sustainable methods in imparting shrink resistance to wool fabrics

Hassan

Carr

2019

Journal of Advanced Research

102

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Section: Shrink-resist Treatments Used In the Wool Industrymentioning

confidence: 99%

A review of the sustainable methods in imparting shrink resistance to wool fabrics

Hassan

Carr

2019

Journal of Advanced Research

102

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“…On the other hand, synthetic dyes are highly expensive, they can have harmful effects on human skin, and the effluent produced by them needs expensive treatments before discharging into the environment. Their degraded products sometimes could be more toxic than the parent dyes . If the effluent is discharged into the environment, it can affect our aquatic and soil environments, ultimately affecting our food webs as they are designed to be recalcitrant. , The toxic synthetic dyes present in textiles affect their biodegradability, which is unlikely for wool fabrics dyed with lignin sulfonate.…”

Section: Resultsmentioning

confidence: 99%

Valorization of Sulfonated Kraft Lignin as a Natural Dye for the Sustainable Dyeing of Wool Fabrics: Effect of Peroxide Oxidation

Hassan

2023

ACS Sustainable Chem. Eng.

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Lignin is an abundant and complex biopolymer with inherent color but has only a few applications. It has the potential to replace synthetic acid dyes for the coloration of wool fibers in brown shades, as traditional dyeing with acid dyes produces toxic effluent needing costly treatment. In this work, the valorization of sulfonated lignin was explored by using it as a natural dye for the coloration of wool fabrics alone and with hydrogen peroxide (H 2 O 2 ). The dyed fabrics were characterized by reflectance and diffuse reflectance spectroscopies to assess the color yield and ultraviolet (UV) protection performance, respectively. The dyed fabrics exhibited reasonably good color yield and satisfactory colorfastness to washing (Grade 3/4), which improved to Grade 4 by the oxidation treatment with H 2 O 2 . The scanning electron microscopy (SEM) images show that when fabrics are dyed alone with lignin, deposition of lignin particles is visible on the fiber surface, but with hydrogen peroxide, no deposition of lignin is visible on the fiber surface, and the color strength of the fabric became almost double. The UV light transmission through the fabric decreased from 6.73 and 13.23% at 311 and 365 nm to 2.19 and 5.23%, respectively. The attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectra of the dyed fabrics showed increased absorption of lignin sulfonate by the fabric, suggesting depolymerization of lignin by H 2 O 2 to smaller macromolecules easing absorption into the wool fiber. Lignin sulfonate could be a cheap and sustainable alternative to harmful synthetic dyes for producing brown shades on wool fabric.

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“…For instance, the presence of various ions and elements compete with the uranium for adsorption sites on the AC and prevent them from entering the micropores by clogging which leads to reduction in the efficiency of the AC. Similarly, the long-term reusability of AC without losing its adsorption capacity is another concern ( Hassan et al, 2007 ). The production of AC from non-renewable sources (including coal or petroleum-based substrates) is a matter of great concern regarding environmental impact and sustainability.…”

Section: Introductionmentioning

confidence: 99%

Efficient and sustainable extraction of uranium from aquatic solution using biowaste-derived active carbon

Ahmad,

Khan,

Khan

et al. 2023

Front. Chem.

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Efficient and cost-effective biosorbents derived from biowaste are highly demanding to handle various environmental challenges, and demonstrate the remarkable synergy between sustainability and innovation. In this study, the extraction of uranium U(VI) was investigated on biowaste activated carbon (BAC) obtained by chemical activation (phosphoric acid) using Albizia Lebbeck pods as biowaste. The biowaste powder (BP), biowaste charcoal (BC) and BAC were evaluated by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) with nitrogen adsorption for thermal properties, chemical structures, porosity and surface area, respectively. The pHPZC for acidic or basic nature of the surface and X-ray diffraction (XRD) analysis were performed for BAC. The morphological and elemental analysis were performed by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The extraction of uranium U(VI) ions from aqueous solutions using BAC as sorbent was investigated by using different variables such as pH, contact time, initial uranium U(VI) concentration and BAC dose. The highest adsorption (90.60% was achieved at 0.5 g BAC dose, 2 h contact time, pH 6, 10 ppm initial U(VI) concentration and with 200 rpm shaking speeds. The production of this efficient adsorbent from biowaste could be a potential step forward in adsorption of uranium to meet the high demand of uranium for nuclear energy applications.

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Decolorisation of effluent with ozone and re-use of spent dyebath

Cited by 12 publications

References 79 publications

A review of the sustainable methods in imparting shrink resistance to wool fabrics

A review of the sustainable methods in imparting shrink resistance to wool fabrics

Valorization of Sulfonated Kraft Lignin as a Natural Dye for the Sustainable Dyeing of Wool Fabrics: Effect of Peroxide Oxidation

Efficient and sustainable extraction of uranium from aquatic solution using biowaste-derived active carbon

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