Teff straw characterization and utilization for chromium removal from wastewater: Kinetics, isotherm and thermodynamic modelling

Wassie, Abrham Bayeh; Srivastava, Vimal Chandra

doi:10.1016/j.jece.2016.01.019

Cited by 46 publications

(24 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Ethiopia, currently there are more than 30 tanneries under operation. From these tanneries, 2-40 mg/L concentration of chromium discharge has been reported (Wassie and Srivastava 2016). This is above the maximum concentration limit set by World Health Organization (WHO).…”

Section: Introductionmentioning

confidence: 80%

“…Tanning industry is one of major polluting industries in developing countries such as India and Ethiopia (Wassie and Srivastava 2016). Environmental studies have shown that chromium is one of the most toxic dangerous heavy metal Aboul-Enein 2002, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Teff (Eragrostis tef) is one of the major food crops used in Ethiopia, and its annual yield is estimated to be about 15.5 million tones/year (Wassie and Srivastava 2016). Teff has very high amount of calcium content and is an excellent source of vitamin C. In the literature, a number of agricultural residues have been tested as adsorbent for chromium removal (Ali and Gupta 2006;Ali 2010Ali , 2012Ebrahimi et al 2015;Kunquan et al 2015;Shiow-Tien et al 2014;Venkatesan et al 2014;Doan et al 2008;Martinez et al 2015;Huang et al 2015;Santos et al 2016;Ali 2012;Elwakeel 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in these studies, only minor characterization like Fourier transform infrared (FTIR) of the teff straw was reported and detailed isotherm and thermodynamics were not reported. Wassie and Srivastava (2016) used raw teff straw without any chemical modification for Cr(VI) removal. Since, chemical modifications are known to improve the characteristics of the adsorbents; therefore, this paper focuses on analyzing effect of chemical treatment on surface functional groups and anatomical structure of teff straw.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Wassie

Srivastava

2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

In this study, teff (Eragrostis tef) straw has been chemically treated and tested as an adsorbent for Cr(VI) removal. Chemically treatment of teff straw was done by NaOH, H 3 PO 4 and ZnCl 2 solutions. Scanning electron micrograph and X-ray diffraction were used for anatomical characterization, whereas Fourier transform infrared spectroscopy was used for surface change characterization of adsorbents. Effects of different experimental parameters like pH (2-12), initial Cr(VI) concentration (100-900 mg/L), adsorbent dose (2.5-20 g/L), contact time (15-360 min) and temperature (288-318 K) were studied. Temperature increment was found to stimulate the adsorption process. Langmuir isotherm was found to give better representation over wide range of temperature for untreated, H 3 PO 4 -as well as ZnCl 2 -treated teff straw, and Freundlich isotherm best represented the isotherm data for NaOH-treated teff straw. Maximum Cr(VI) adsorption capacity of untreated, NaOH-, H 3 PO 4 -and ZnCl 2 -treated teff straw was found to be 86.1, 73.8, 89.3 and 88.9 mg/g, respectively. Respective values of average effective diffusion coefficient (D e ) were found to be 2.8 9 10 -13 , 2.59 9 10 -14 , 1.32 9 10 -13 and 1.14 9 10 -13 m 2 /s, respectively. The negative value of DG o for all the adsorbents indicates Cr(VI) spontaneous adsorption. Isosteric heat of adsorption (DH st,a ) was found to vary with surface coverage (h). DH st,a increased for untreated, H 3 PO 4 -and ZnCl 2 -treated teff straw, and decreased steadily with h for NaOH-treated teff straw.

show abstract

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Wassie

Srivastava

2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…where q t and [s] are the amount of ammonium removed at one time t (mg of adsorbed per g of adsorbent) was calculated with the following equation (Wassie and Srivastava, 2016) …”

Section: Experimental Adsorption Proceduresmentioning

confidence: 99%

Removal of ammonium from fish farms by biochar obtained from rice straw: Isotherm and kinetic studies for ammonium adsorption

Khalil

Sergeevich

Borisova

2018

Adsorption Science & Technology

View full text Add to dashboard Cite

Ammonium is a water pollutant that harms the environment, particularly fisheries. Rice straw is also an economic waste of rice, with millions of tons produced per year around the world. In this paper, physical and chemical procedures for the modification of rice straw were studied. The kinetic and isothermal adsorption trends were investigated, including the ammonium removal efficiency, the contact time of the adsorbent, the amount of adsorbent, and the initial concentration of NH 4 þ . The effect of temperature and pH on the adsorption process was discussed. The removal efficiency of NH 4 þ recorded 43, 53.7, and 69.5%, with maximum adsorption values of 2.9, 3.5, and 4.5 mg/g at temperatures of 25 AE 5, 35 AE 5, and 45 AE 5 C, respectively, at pH 7.5. The biochar obtained from rice follows the pseudo-second-order equation for ammonium adsorption kinetics (R 2 ¼ 0.98). The adsorption isotherm follows Freundlich's model (R 2 ¼ 0.99) and Langmuir's model (R 2 ¼ 0.98).

show abstract

Phytoremediation Potential of Free Floating Plant Species for Chromium Wastewater: The Case of Duckweed, Water Hyacinth, and Water Lilies

Gemeda

Gabbiye

Alemu

2019

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

View full text Add to dashboard Cite

Teff straw characterization and utilization for chromium removal from wastewater: Kinetics, isotherm and thermodynamic modelling

Cited by 46 publications

References 21 publications

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Removal of ammonium from fish farms by biochar obtained from rice straw: Isotherm and kinetic studies for ammonium adsorption

Phytoremediation Potential of Free Floating Plant Species for Chromium Wastewater: The Case of Duckweed, Water Hyacinth, and Water Lilies

Contact Info

Product

Resources

About