Removal of Hexavalent Chromium (Cr6 ) Using Different Natural Adsorbents A Review

Yogeshwaran, V.; Priya, A.K.

doi:10.2139/ssrn.3090245

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…Many adsorbents (Coconut shell, Date pits, Seeds, Aloe vera etc.,) have been used to remove the toxic pollutants from the wastewater. The size and shape of the adsorbate were not in the unique and the characteristics of each adsorbent are relatively different from each other [10]. The efficiency of the adsorption is commonly affected by certain parameters such as pH, temperature, size of the particle, initial and final concentration of the adsorbent [09].…”

Section: Types Of Membrane Treatment Process and Resultsmentioning

confidence: 99%

“…In water treatment technology, there are two different ways (Photo-catalysis and Adsorption) to use the graphene effectively [4]. Compared to the Photo-catalysis process, Adsorption process gives the various options to remove the contaminated pollutants in the wastewater and produce the adsorbents due to the surface area and useful groups of chemicals in carbon materials with greater efficiency [14,15].…”

Section: Fig 21 Graphene Oxide Layermentioning

confidence: 99%

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Membrane process and Graphene nano-particles in Water treatment

Yogeshwaran¹,

R.P²,

V.M³

et al. 2019

IJITEE

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The suspended and dissolved particles presented in the water and wastewater in the size of 1-1000 nm which is more toxic and it causes severe effects to the aquatic life and living organisms. Nanotechnology is the method, which is newly developed in this world, to remove the very tiny particles presents in the water as well as wastewater with the help of nano-particles. Many nano-particles were used to remove the toxic contents presented in water and wastewater such as heavy metal concentration, dyes and some of the virus and bacteria etc. Compared to various nano-materials, Graphene is the type of smart material which is derived from the graphite, most widely used in all industrial sectors for various purposes. This review paper discussed about the importance of graphene usage in water and wastewater treatment technologies in recent days.

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Section: Types Of Membrane Treatment Process and Resultsmentioning

confidence: 99%

Section: Fig 21 Graphene Oxide Layermentioning

confidence: 99%

Membrane process and Graphene nano-particles in Water treatment

Yogeshwaran¹,

R.P²,

V.M³

et al. 2019

IJITEE

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“…These methods include chemical precipitation, ion exchange, membrane separation process, electrocoagulation and adsorption (2) (13) (7). Although the chemical precipitation has traditionally been the most used method (14), it suffers from many draw backs like incomplete removal, requirement of sizable quantities of treatment chemicals and production of large amount of toxic sludge. A variety of other treatment technologies were considered and evaluated.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of High Chromium Concentrations from Industrial Wastewater Using Different Agricultural Residuals

A¹,

Hendy²,

M³

et al. 2020

J. Environ. Treat. Tech.

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Hexavalent chromium Cr (VI) is a toxic material used in many industries such as tanneries and electroplating industries. Most of the previous researches studied the removal of chromium at lower concentrations up to 600 mg/L but did not tackle the behavior at higher concentrations, which resemble the real concentration of studied tanneries effluents. The present research is a comparative study of different agricultural low cost adsorbents in the removal of high Chromium concentration from industrial wastewater up to 1000 mg/L, compared to a commercial activated carbon. The tested adsorbents are (Banana Waste (BW), Sawdust (SD), Phragmites Australis (PA), Sugarcane Bagasse (SCB), Pea pod peels (PPP) and Rice straw (RS)). The materials were chemically pretreated with acid-alkali except BW was treated with acid only, to improve adsorbent metal binding capacity. Batch experiments were conducted to study the effect of pH, adsorbent dosage, contact time, initial Chromium concentration and temperature on the removal efficiency of Chromium from wastewater. The experiments were conducted in two sets, one for lower concentration (25-50-100-200-400) mg/L and the other for higher concentration (600-800-1000) to simulate the concentration of Chromium in tannery industry effluents. At 1000 mg/L initial concentration, BW achieved the optimum removal efficiency of 73.28% at pH = 3, adsorbent dosage = 25 g/L and contact time of 3 hours with the adsorption capacity was 39 mg/g. For SD at pH=2, 3 hours contact time, 10 g/L dosage, and 30oC the removal ratio was 64.83% and the adsorption capacity was 86.30 mg/g. The equilibrium data for various agricultural adsorbents was being tested with various adsorption isotherm models such as Langmuir, Freundlich and Tempkin. At low concentrations, AC, BW, PA and SCB follows Freundlich isotherm model while SD follows Langmuir isotherm model. At higher concentrations, BW, SD, PA follows Langmuir isotherm while SCB follows Tempkin isotherm model. To evaluate the mechanism of Cr adsorption on different adsorbents, Pseudo-first-order and Pseudo-second-order equations were used. The adsorption process follows Pseudo-second-order for all adsorbents, which confirms the chemisorption of Cr (VI) on different adsorbents.

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“…One of the most important issues of Cr(VI) besides its high toxicity is related to the bioaccumulation property of the liver, it causes kidney syndromes, and it can be deadly at concentrations above 0.1 mg L -1 [6,7]. Previous works reported that the quantity of Cr(VI) in industrial effluents range from 0.5 to 270 000 mg L -1 [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Forward Osmosis Process Using Aquaporin Membranes in Chromium Removal

et al. 2019

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Due to the lack of affordable and feasible wastewater treatment technologies, various industries in developing countries are discharging chromium (Cr) without meeting the environmental standards. Here, the aim was to employ forward osmosis (FO) using aquaporins (AQP)-based biomimetic membranes and optimize the Cr rejection through response surface methodology (RSM). The initial concentration of draw solution, feed solution, and time was selected as independent variables in order to optimize Cr rejection and water flux. A high Cr rejection efficiency and water flux were achieved under the optimal conditions. These results revealed that the FO process applying an AQP membrane beside the RSM could be considered to treat wastewaters containing heavy metals.

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Removal of Hexavalent Chromium (Cr6 ) Using Different Natural Adsorbents A Review

Cited by 9 publications

References 9 publications

Membrane process and Graphene nano-particles in Water treatment

Membrane process and Graphene nano-particles in Water treatment

Adsorption of High Chromium Concentrations from Industrial Wastewater Using Different Agricultural Residuals

Optimization of the Forward Osmosis Process Using Aquaporin Membranes in Chromium Removal

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