Advances in preparation of modified activated carbon and its applications in the removal of chromium (VI) from aqueous solutions

Deng, Zhenliang; Liang, Mingkun; Li, H H; Zhu, Zongqiang

doi:10.1088/1755-1315/39/1/012065

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…Organic biomass has attracted excessive attention as biosorbents because of their wide availability and combine exceptional adsorption performance. To enhance the capacity and morphological structure of a biosorbent, a number of modification methods have been tested (Chao, Wang, & Tran, ; Pinskii et al, ; Xiong et al, ), of which modification using alkali (Deng, Liang, Li, & Zhu, ), modifying by loading zirconium oxide and iron oxide onto activated carbon nanofiber (Xiong et al, ), and modifying using nitric acid (Kang et al, ) are the latest developments in the sorption studies. Being cost‐effective, good efficiency, and ease of use, modification of biochar using alkali treatment is an appealing technique.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Asadullah

Kaewsichan

Tohdee

2019

Water Environment Research

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Hydrochar obtained after hydrothermal carbonization (HTC) of Lepironia articulata (LA) was modified into biochar by reacting with a specific amount of KOH in a tubular reactor under slow pyrolysis. The physical and chemical properties of the hydrochar and modified biochar were characterized. The performance of modified biochar (LABC) was investigated through batch sorption experiments. Removal (%) and the maximum adsorption capacity (q max ) of Cr(VI) onto LABC increased up to 98.9% and 28.75 mg/g relative to 63.44% and 21.90 mg/g in unmodified hydrochar (LAHC) at pH 2.0, 313 K, and 200 mg/L, respectively. The sorption kinetics uptake data were best interpreted with pseudo-second-order model, and sorption isotherm was simulated with the Langmuir adsorption model. The thermodynamic parameters confirm the adsorption process to be an endothermic, spontaneous, and increased disorder. The overall results revealed that LABC can be utilized as an environmentally friendly, inexpensive, and effective adsorbent in Cr(VI) removal. • Practitioner points• Hydrochar and modified biochar prepared from a tropical biomass (Lepironia articulata) were successfully used for the removal of Cr(VI) from aqueous solution. • Increased specific surface was obtained by applying chemical modification with alkali treatment, contributing to effectiveness as adsorbent. • Dimensionless K c was estimated from the Langmuir fits and then used to estimate thermodynamics of adsorption. • The signs of ∆H°, ∆G°, and ∆S° indicate that the adsorption of Cr(VI) onto LABC was an endothermic, spontaneous, and increased disorder.

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Section: Introductionmentioning

confidence: 99%

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Asadullah

Kaewsichan

Tohdee

2019

Water Environment Research

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“…Despite the unique properties of AC, modifications can be done to its carbon surface to improve the AC performance. The modification process occurs on the AC's surface to modify its physical and chemical properties, such as functional groups and porous structures [46][47][48][49][50]. The modification of the physical structure helps in altering the pore size, whether becoming smaller or bigger, other than increasing the surface area.…”

Section: Modificationmentioning

confidence: 99%

“…The modification of the physical structure helps in altering the pore size, whether becoming smaller or bigger, other than increasing the surface area. This method usually involves carbonization or oxidative gas to enhance the structures [47,48]. In contrast, chemical modification focuses on changing the chemical properties of AC's surface, such as the functional groups, ionic compounds, hydrophilic and hydrophobic properties.…”

Section: Modificationmentioning

confidence: 99%

An Overview of Activated Carbon Preparation from Various Precursors

Ahmad

2023

SRJ

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Activated carbon plays an important role in the industry due to its uniqueness and special characteristics. Originally known as a good adsorbent, activated carbon has a very large surface area and high micro-porosity. Activated carbon has been widely used in petroleum, pharmaceutical, textiles and many other industries. Activated carbon can be derived directly from charcoal through chemical or physical activation. Nonetheless, activated carbon can also be obtained from other carbon precursors, such as biowaste (agricultural, municipal and industries) and natural resources (seed, leaves, fruits and barks). Generally, activated carbon can derive from wastes through four steps; pre-processing of raw materials, thermal-conversion steps (pyrolysis or carbonization), activation, and modification. Both activation and modification were employed in the production of activated carbon to boost its adsorption performance. These steps can be divided into chemical and physical steps that help alter the physical structure of activated carbon and modify the surface chemical properties of activated carbon. Due to its reliability as an adsorbent, activated carbon has been widely used to remove pollutants in wastewater treatment and the demand for activated carbon has been increasing every year. This article reviews methods for preparing activated carbon from various precursors and discussed their performances. This review article aimed to provide recent information on efforts made by various researchers in activated carbon preparation.

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“…The magnitude of adsorption increases abruptly at a specific pH which is the characteristic acid-base behavior of activated carbons. However, in order to minimize processing costs for these effluents, recent investigations have focused on the use of low cost adsorbents [4].…”

Section: Introductionmentioning

confidence: 99%

Dual Functions of Nonwoven Activated Carbon Fiber for Adsorption of Cobalt(II) and Microorganisms from Waste Water

et al. 2019

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A CTIVATED carbon fiber (ACF) is considered a superior absorbent material due to its numerous advantages such as, high surface area, several pore volumes and distinct surface chemistry. ACF has the ability to remove organic and inorganic compounds from waste materials. The present work aims to prepare activated carbon fiber from polyacrylonitrile waste fibers and evaluate its ability to remove Co(II) from waste water as well as microbes. The results revealed that, the maximum adsorption of Co(II) onto ACF was 92.9 % at pH 10 and 30 •C. The sorption capacity of ACF increased with increasing the pH of the solution from 1.27 mg/g to 44.4 mg/g. Increasing the adsorption time from 10-60 minutes increased the sorption capacity from 38.77 mg/g to 44.41 mg/g. The statistical analysis of the data revealed that there is a significant effect for both pH of the soution and adsorption time.The pathogenic microorganisms such as E. coli, P. aeroginos, B. subtilis, St. aureus, and C. albicans were efficiently removed by ACF. The characterization of surface chemistry of ACF before and after Co(II) adsorption was determined by FTIR and the surface topography was evaluated by SEM.

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Advances in preparation of modified activated carbon and its applications in the removal of chromium (VI) from aqueous solutions

Cited by 6 publications

References 24 publications

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

An Overview of Activated Carbon Preparation from Various Precursors

Dual Functions of Nonwoven Activated Carbon Fiber for Adsorption of Cobalt(II) and Microorganisms from Waste Water

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