Removal of Chromium(vi) From Wastewater  Using Citric Acid Modified Sugarcane Bagasse

Dean, Adel M. Kamal El; Hashem, Elham Y.; Ahmed, Mostafa; Mohamed, Mohamed A.; Hussain, Sawsan M.

doi:10.17628/ecb.2019.8.141-149

Cited by 2 publications

(3 citation statements)

References 30 publications

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“…The applicability of the Pseudo-first-order kinetic model to the experimental data are tested by plotting the linear form as a graph of log (qe-qt) versus time Fig (8). The estimated values of the Pseudo-first-order kinetic parameters, K and qe along with the regression coefficient (R 2 ) are in Table (2). The values of (R 2 ) are estimated as 0.9712, 0.9975, 0.7865, 0.9911 and 0.6318 for the removal of Cr (VI) using AC, BW, SD, PA and SCB respectively.…”

Section: Pseudo-first-order Kinetic Modelmentioning

confidence: 99%

“…Water pollution caused by toxic heavy metal ions has become a serious environmental problem. A serious health hazard results from dissolved heavy metals escaping into the environment, which accumulate throughout the food chain in living tissues, multiplying their effects (2). Chromium is an important heavy metal that is released into natural water from various sources, including electronics, electroplating, metallurgical, and leather tanning industries (3) (4).…”

Section: Introductionmentioning

confidence: 99%

“…A number of methods are available for the removal of heavy metals from aqueous solution. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Pseudo-first-order Kinetic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%