Insights into chemical regeneration of activated carbon for water treatment

Larasati, Amanda; Fowler, G.D.; Graham, Nigel

doi:10.1016/j.jece.2021.105555

Cited by 73 publications

(16 citation statements)

References 125 publications

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“…One of the most well‐known and common regeneration methods of AC in industrial plants is thermal regeneration 39 . As mentioned in Sections 2 and 3, the effect of thermal regeneration temperature (350–550°C) on the adsorption performance of the regenerated sorbent at the next adsorption cycle was investigated.…”

Section: Resultsmentioning

confidence: 99%

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

Najafi

Sharifian

Asasian‐Kolur

2022

Env Prog and Sustain Energy

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Due to the worldwide concern about emerging contaminants in aqueous systems, the main objective of the present study is the adsorption of gemifloxacin (GMF), a fluoroquinolone-type antibiotic, by rice straw-based activated carbon. The rice straw chemically activated with K 2 CO 3 (RSAC) had very high carbon content (>80%) and low silica content (due to the extraction step after activation), high specific surface area (1668 m 2 /g), and oxygenated functional groups. The GMF adsorption capacity of RSAC was relatively dependent on the initial pH of the solution and highly dependent on the adsorbent dose. The pseudo-second order model and the BET isotherm models were the best models for predicting adsorption's kinetic and equilibrium behaviors. The maximum monolayer adsorption capacities of RSAC at 25, 35, and 45 C were 565.6, 552.4, and 525.8 mg/g, respectively. The thermodynamic parameters indicated a spontaneous and exothermic character of the GMF adsorption process. n-π, π-π, electrostatic interactions, and hydrogen bonding were demonstrated as probable mechanisms involved. Thermal regeneration of GMF-saturated RSAC at 550 C resulted in perfect adsorbent regeneration in the second cycle and reasonable performance in the third cycle.

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Section: Resultsmentioning

confidence: 99%

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

Najafi

Sharifian

Asasian‐Kolur

2022

Env Prog and Sustain Energy

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“…In the course of the adsorption process, the performance efficiency of AC progressively diminishes, and requires replenishment or treatment after exhaustion [ 70 , 79 , 80 ]. Replenishment is expensive, and the economic viability of the adsorption process is determined by the reusability of spent AC [ 51 , 81 , 82 ].…”

Section: Application Of Aops For Dye-activated Saturated Carbon Regen...mentioning

confidence: 99%

“…When organic pollutants are subjected to heat, there is a possibility of forming toxic by-products that can be emitted into the environment [ 70 , 80 ]. Besides, thermal regeneration cycles are long, and causes a deterioration in the microporous structure of AC, consequently reducing the adsorption efficiency in subsequent adsorption runs [ 23 , 79 , 87 , 88 ].…”

Section: Application Of Aops For Dye-activated Saturated Carbon Regen...mentioning

confidence: 99%

Regeneration of dye-saturated activated carbon through advanced oxidative processes: A review

Santos

Xiao

Chaukura

et al. 2022

Heliyon

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“…With the escalating demand for environmental regulation worldwide, activated carbon (AC) has been extensively used as an adsorbent for wastewater treatment and flue gas purification. − In China, approximately 900,000 tons of AC were produced , and used at home and abroad in 2021 . After use, spent AC becomes a hazardous waste due to the absorption of organic compounds or heavy metals (HMs). − The increasing amount of spent AC generated has been an environmental issue and requires attention for its disposal and recycling …”

Section: Introductionmentioning

confidence: 99%

Environment–Energy–Economy Analysis and Related Technical Transition Strategies for Spent Activated Carbon Regeneration in China

Gong

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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Spent activated carbon (AC) regeneration attracts growing interests due to the increased waste amounts and limited AC resources. Herein, environment–energy–economy performances of four spent AC regeneration technologies demonstrated in China were compared with conventional incineration via life cycle assessment (LCA), energy-efficiency analysis (EEA), and environmental life-cycle costing. Their energy efficiencies are lower than 42%, which should be improved. Tradeoffs between environmental and economic performances found such as tunnel kiln regeneration technology were handled by integrating both performances with emission monetization model by internalizing environmental externalities as economic metric. Results indicated that microwave and rotary-kiln regeneration are preferred and break even in 2 years even with externalities. Potential pollution migration (in air–water–human medium) analysis illustrates that technical-sustainable transition from spent AC incineration to regeneration may relieve GHG emissions but add human risks due to dioxins and heavy metal emitted. Regeneration rate and energy use are sensitive to environmental and economic result.

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Insights into chemical regeneration of activated carbon for water treatment

Cited by 73 publications

References 125 publications

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

Regeneration of dye-saturated activated carbon through advanced oxidative processes: A review

Environment–Energy–Economy Analysis and Related Technical Transition Strategies for Spent Activated Carbon Regeneration in China

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