Sorptive Removal of Dyes from Aqueous solution: A Review (original) (raw)

Removal of Dyes from Wastewater using Adsorption -A Review

The adsorption process is being extensively used for the removal of dyes from synthetic dyehouse effluents by various researchers. The most widely used adsorbent is commercially available activated carbon. Despite the frequent use of adsorption in wastewater treatment systems, commercially available activated carbon remains an expensive material. In recent years, the safe and economical methods are required for the treatment of dyehouse effluents, which involved researchers to focus towards the preparation of low cost adsorbents from cheapest sources. Therefore, in this review article, the different cheapest sources of preparing adsorbent are discussed and their feasibility in treating dyehouse effluents is studied. INTRODUCTION Dyeing industry is one of the largest water consuming industries. The effluent coming out of the dyeing industries contains various chemicals and colouring compounds and the effluent requires proper treatment before it is discharged into any water body. But,...

Removal of Dyes from the Environment by Adsorption Process

Chemical and Materials Engineering, 2018

Organic dyes are considered as serious water pollutants. There are several ways for removal of these compounds from environment, which are mainly based on biological, chemical, and physical methods. In this paper, we first classify the common organic dyes which are in use in today's industry; then, methods of their elimination from environmental water and wastewater will be discussed very briefly, with an emphasize on adsorption techniques. At the end, some modern advanced adsorbents are presented.

Removal of Direct Dyes from Aqueous Solution Using Various Adsorbents

Dyestuff production units and dyeing units have always had a pressing need for techniques that allow economical pre-treatment for colour in the effluent. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment options. Removal of direct dyes [direct yellow 50 (DY50), direct red 80 (DR80) and direct blue 71(DB71)] from an aqueous solution by different adsorbents such as activated carbon, raw kaolinite and montmorillonite was investigated. The adsorption isotherm data were fitted to the Langmuir isotherm. Parameters of the Langmuir isotherm have been determined using the adsorption data. Adsorption capacity of RAC (commercial activated carbon), HAC (activated carbon obtained from shell of hazelnut), KC ( raw kaolinite) and MC (montmorillonite) increased in the following order: DY50 > DR80 > DB71, DB71>DR80>DY50, DR80>DB71>DY50 and DB71>DR80 (DY50 showed no absorption) for the direct dyes, respectively.

REVIEW PAPER ON REMOVAL OF A DYE FROM AQUEOUS SOLUTION BY ADSORPTION

To investigate the adsorption capacities of locally available low cost bio-adsorbents like neem leaves, orange peels, peanut hulls and coconut coir pith powders to remove colour in a textile industry wastewater, experiments were performed. The experiments were conducted at pH of 7 with different process parameters like adsorbent dosage, temperature, contact time and agitator speed using batch adsorption method. From the experimental results, the maximum colour from the textile industry wastewater was obtained at an optimum adsorbent dosage of 350 mg, an optimum contact time of 73 min., an optimum temperature of 330 K and an optimum agitator speed of 650 rpm. Further, from the validation experiments, it was found that the maximum colour removal percentage in textile industry wastewater is about 75.2%, 78.3%, 86.6% and 81.7 % respectively for neem leaves, orange peels, peanut hulls and coconut coir pith powders. This result was higher than the results obtained by different process parameters for various bio-adsorbents. Finally, from the results of adsorption study, it was concluded that bio-adsorbents used as a coagulant for removing the colour from textile industry wastewater especially peanut hulls powder because of its higher adsorptive capacity than other bio-adsorbents used in this study.

Removal of Dyes From Wastewater by Adsorption Onto Low-Cost Adsorbents

Impact of Textile Dyes on Public Health and the Environment, 2020

This chapter describes an up-to-date critique of the use of adsorption as a wastewater treatment technique for the removal of dyes. The topics range from the classification of dyes, their occurrence in water and toxicity, various treatment methods, and dye adsorption dynamics onto agricultural wastes and inorganic adsorbents such as clay and metal oxides and adsorption onto microbial biomass under varying operational conditions. It is demonstrated that the discussed materials form alternative adsorbents for dye adsorption from aqueous solutions with comparable or better removal efficiencies relative to the non-renewable coal-based granular activated carbons; they are cheap and abundant. The relative performance of the adsorbents under different environmental parameters for dye removal has also presented. The deductions made and alluded to from various kinetic and adsorption isotherm models are also discussed. The chapter presents the past, present, and suggestions for future conside...

DATA ANALYSIS OF ORGANIC DYE REMOVAL FROM SYNTHETIC WASTE WATER USING LOW-COST ADSORPTION

Wesleyan Journal of Research, 2021

Numerous studies use the adsorption process to remove dyes from organic dye house sewages. Adsorption is commonly used in wastewater treatment systems; activated carbon remains a costly commodity on the market. Safe and economical methods have been required in recent years for handling dye house effluents, forcing researchers to concentrate on producing low-cost adsorbents from the cheapest sources. The quality of our water resources is worsening and the use of colouring produces colour wastewaters that cause environmental concern. Textile wastewater includes a wide variety of dyes and chemical additions that not only as liquid waste but also in its chemical composition pose the environmental challenge for the textile industry. Key contamination of clothing runoff arises from dyeing and finishing operations, these processes involve the input of a wide range of chemicals and dyes, which are usually complex organic compounds. The various input parameters has taken which need to be extracted from clothing wastewater. In this research we propose analysis of dye removal from wastewater with the help of various adsorption, this research also focused on calculate the ph value before and after dye removal from wastewater. For experiment analysis we carried out different kind of dyes which is validated with various configuration of adsorption. The partial implementation and result illustrates when adsorption capacity has increased it will automatically provide maximum dye remove from wastewater.

Cationic dyes removal from wastewater by adsorptive method: A systematic in-depth review

2021

One of the most pressing environmental problems is the existence of synthetic dyes in industrial wastewaters. The presence of dyes in wastewater can cause severe problems to human beings and aquatic life, and that warrants removal from aqueous medium. Amongst the multiple strategies to treat dye-contaminated water, adsorption is considered superior because of low cost, flexibility, ease of operation and lower energy consumption. Many adsorbents, including carbon-based materials, biomaterials, nanomaterials, Schiff bases, metal-organic frameworks as well as natural and synthetic polymers, have been successfully applied in cationic dyes remediation. The current review article provides literature information about cationic dyes, various treatment strategies, principles of adsorption and recent trends in adsorbents application were discussed at length. The applicability of various isotherms and kinetic models for cationic dyes removal by diversified adsorbents is also highlighted here. ...

An overview of dye removal via activated carbon adsorption process

Desalination and Water Treatment, 2010

Water scarcity and pollution rank equal to climate change as the most intricate environmental turmoil for the 21st century. Today, the percolation of textile effluents into the waterways and ecosystems remain a fastidious conundrum towards the public health and food chain interference. In such circumstances, it becomes mandatory for each dye emitting industry or facility to opt for proper dye control measures. With the renaissance of activated carbon, there has been a steadily growing interest in this research field. This paper attempts to postulate a state of the art review of dye processing industry, its fundamental characteristics and environmental implications. Moreover, the key advance of proposed precursors, activated agents, together with the effects of adsorbent dosage, concentration, contact time, pH, particle size, temperature competition, and isotherms, kinetic and thermodynamic studies for adsorption of dyes onto activated carbons are summarized and discussed. Conclusively, the expanding of adsorption science in dye treatment represents a plausible tool for accruing the worldwide environmental benefit and shaping the national economy.

Study of Effect of Concentration on Adsorption of Methyl Red Dye using different Adsorbents

International Journal for Research in Applied Science and Engineering Technology, 2017

Textile processing industries are now widespread sectors in many developing countries. Among the various processes in the textile industry, dyeing process uses large volume of water for dyeing, fixing and washing processes. Thus, the wastewater generated from the textile processing industries contains suspended solids, high amount of dissolved solids, un-reacted dyestuffs (colour) and other auxiliary chemicals that are used in the various stages of dyeing and processing. The conventional method of textile wastewater treatment consists of chemical coagulation, biological treatment followed by activated carbon adsorption. However, wastewater containing dyes is very difficult and complex to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents due to their molecular structure and size. Adsorption techniques have gained popularity in recent years because of their proven efficiency in the removal of po...