Adsorption of Hexavalent Chromium from Aqueous Solution on Raw and Modified Activated Carbon

Tang, Chunfang; Zhang, Riqing; Shen, Weixiang; Li, Kelin; Zheng, Xin; Zhu, Ming

doi:10.2175/106143009x407456

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…(7), it is observed that the percentage removal of Chromium increases by increasing the temperature from 30 to 70 o C for all materials. This increase is due to the increase of the rate of adsorption at higher temperature which indicates that the adsorption process is endothermic (50). The optimum removal was for sawdust at 70 o C by 82% followed 80.7% for banana waste at 60 o C. Similar results were reported by (20), (6) and (27).…”

Section: Effect Of Temperature On Cr Adsorptionsupporting

confidence: 82%

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: Effect Of Temperature On Cr Adsorptionsupporting

confidence: 82%

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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“…Adsorption Isotherms for the Mulberry Branch Biomass Char with Adsorption of Copper(II) Acetate [Cu(II)]. Adsorption isotherms are important for describing how an adsorbate will interact with an adsorbent, and are critical in optimizing the use of adsorbents (Tang et al, 2009). As the results described in section 3.3 show, copper(II) acetate [Cu(II)] was selected to investigate the adsorption isotherms.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, epidemiological evidence-such as a high incidence of cancer among coppersmiths-suggests a primary carcinogenic role for copper (Ho et al, 2002;Larous et al, 2005;Rao et al, 2006). Another important toxic heavy metal, chromium, has been recognized as one of the most serious pollutants among heavy metals for its toxic effects, nonbiochemical degradation characteristics, and accumulation throughout the food chain (Tang et al, 2009). Copper, in a natural state, exists in two most common and stable oxidation states-trivalent chromium [Cr(III)] and hexavalent chromium [Cr(VI)].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mulberry Branch Biomass Char and Its Usage in Wastewater Treatment

Wu¹,

Wang²,

Zhang³

et al. 2012

Water Environment Research

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Biomass char was prepared from mulberry branches by physical activation. An examination by Fourier transform infrared spectroscopy (FTIR) indicated that the functional groups of Si-O were mostly burnt out, significantly decreasing the ash content. Analysis of data from a scanning electron microscope (SEM) and a Brunauer-Emmett-Teller (BET) test also revealed increased surface roughness and pore structure, which improved the adsorption capacity of biomass char after preparation. The optimum conditions for preparation were found to be pyrolysis at 700 °C for 30 minutes, and then activation at 750 °C for one hour, with 3.4% steam content for the activating agent. The prepared biomass char was then employed to adsorb ammonium, copper(II) actetate [Cu(II)] and hexavalent chromium [Cr(VI)] in a solution. The results indicated that the prepared biomass char had a better adsorptive performance than the raw material. Moreover, the removal of determinands increased along with the dosage, and the highest adsorption efficiency of ammonium, copper(II) acetate [Cu(II)] and hexavalent chromium [Cr(VI)] were found to be 20%, 100% and 50%, respectively. The adsorptions of ammonium and hexavalent chromium [Cr(VI)] can be simulated by a pseudo-second order model, while the adsorption of copper(II) acetate [Cu(II)] is better simulated by a pseudofirst order model. The adsorption isotherms of copper(II) acetate [Cu(II)] by biomass char were also investigated, and the Langmuir isotherm was found to best describe the adsorption process. Water Environ. Res., 84, 2060Res., 84, (2012.

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“…Their findings revealed that the adsorption of Cr(VI) decreased as pH increased, with the maximum adsorption occurring at pH 2. 149 In another study, when the pH was increased from 2 to 6, the adsorption capacities of Cu(II) increased from 0.7 mg/g to 1.76 mg/g. Another crucial element in the adsorption process is the particle size.…”

Section: Heavy Metal Removalmentioning

confidence: 95%

Recent Advances in Advanced Micro and Nanomanufacturing for Wastewater Purification

Verma,

Mondal,

Islam

et al. 2024

ACS Appl. Eng. Mater.

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Amid global concerns over water scarcity and escalating environmental pollution, there has been a surge in research and innovation for pioneering wastewater purification technologies. Advanced micro and nanomanufacturing methods emerge as promising avenues to enhance conventional treatment efficiency. This review guides readers through recent advancements, merging precision engineering at micro/nanoscales with water treatment intricacies, yielding transformative solutions. Exploring lithography-based techniques, additive manufacturing, self-assembly, and microfluidics, it uncovers diverse approaches crafting materials to interact with and neutralize pollutants. The manuscript navigates the fusion of micro/nanomanufacturing with the urgent global need for clean water. By showcasing empowered materials surpassing traditional treatment, it tackles expanding pollutant challenges. Beyond compiling breakthroughs, this review seeks to inspire future research by illuminating how precision manufacturing can address water treatment, holding the potential to combat scarcity and pollution, and safeguard ecosystems for generations.

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Adsorption of Hexavalent Chromium from Aqueous Solution on Raw and Modified Activated Carbon

Cited by 10 publications

References 25 publications

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

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

Preparation of Mulberry Branch Biomass Char and Its Usage in Wastewater Treatment

Recent Advances in Advanced Micro and Nanomanufacturing for Wastewater Purification

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