Surface functional groups of carbon-based adsorbents and their roles in the removal of heavy metals from aqueous solutions: A critical review

Yang, Xiaodong; Wan, Yongshan; Zheng, Yun; He, Feng; Yu, Zebin; Huang, Jun; Wang, Hailong; Ok, Yong Sik; Jiang, Yinshan; Gao, Bin

doi:10.1016/j.cej.2019.02.119

Cited by 920 publications

(256 citation statements)

References 213 publications

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“…Biochar mainly affects the bioavailability of heavy metals in the soil through adsorption; the adsorption includes both chemisorption and physisorption. Biochar is highly aromatized and highly porous (Yang et al 2019;Zhang et al 2019a, b). When heavy metal ions are close to the benzene ring, the electron cloud of benzene ring can be polarized and produce a weak electrostatic effect, which leads to physisorption (Gomez-Eyles and Ghosh 2018).…”

Section: Contamination Controlmentioning

confidence: 99%

Past, present, and future of biochar

Chen

Meng

Han

et al. 2019

Biochar

340

141

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After entering the twenty-first century, biochar has become a focal point of multidisciplinary research because of its special characteristics, broad application, and promising development prospects. Basic and applied research on the application of biochar in the areas of agriculture, environment, and energy have increased dramatically in the face of food security, environmental pollution, and energy shortage. Although there are some disputes about biochar research, many studies have demonstrated the importance of biochar research from the perspective of scientific advancement and practical application. This paper briefly recalls the history of biochar application; introduces research progress on the basic characteristics of biochar and its associated production technologies; summarizes the research status and existing problems of biochar application in the areas of agriculture, environment, and energy; and analyzes the potential problems and development trends of biochar research in the future.

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Section: Contamination Controlmentioning

confidence: 99%

Past, present, and future of biochar

Chen

Meng

Han

et al. 2019

Biochar

340

141

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“…Fast industrialization, developing urbanization, expanding populace, broad utilization of nonmaintainable assets, and uncontrolled mishandling of common resources are making destructive, unrecoverable, and grave harms to the earth [1]. These effluents are persistent in the ecosystem and difficult to decontaminate [2]. Among these pollutants, one of the most significant is the heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Based Bio-Composite Modified with Thiocarbamate Moiety for Decontamination of Cations from the Aqueous Media

et al. 2020

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Herein, we report the development of chitosan (CH)-based bio-composite modified with acrylonitrile (AN) in the presence of carbon disulfide. The current work aimed to increase the Lewis basic centers on the polymeric backbone using single-step three-components (chitosan, carbon disulfide, and acrylonitrile) reaction. For a said purpose, the thiocarbamate moiety was attached to the pendant functional amine (NH2) of chitosan. Both the pristine CH and modified CH-AN bio-composites were first characterized using numerous analytical and imaging techniques, including 13C-NMR (solid-form), Fourier-transform infrared spectroscopy (FTIR), elemental investigation, thermogravimetric analysis, and scanning electron microscopy (SEM). Finally, the modified bio-composite (CH-AN) was deployed for the decontamination of cations from the aqueous media. The sorption ability of the CH-AN bio-composite was evaluated by applying it to lead and copper-containing aqueous solution. The chitosan-based CH-AN bio-composite exhibited greater sorption capacity for lead (2.54 mmol g−1) and copper (2.02 mmol g−1) than precursor chitosan from aqueous solution based on Langmuir sorption isotherm. The experimental findings fitted better to Langmuir model than Temkin and Freundlich isotherms using linear regression method. Different linearization of Langmuir model showed different error functions and isothermal parameters. The nonlinear regression analysis showed lower values of error functions as compared with linear regression analysis. The chitosan with thiocarbamate group is an outstanding material for the decontamination of toxic elements from the aqueous environment.

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“…This valorization can produce CaO and Ca(OH) 2 , which has the capacity to effectively remove phosphate. The nanoscale size of produced product provides enormous surface area and activated surface for effective adsorption of phosphorus, fluoride, and many other heavy metals such as Pb, Cu, As, and Cd [16][17][18]. Numerous studies have been performed on bioceramics, lime sludge, and red mud (~46 wt.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

Khan

Ramakrishna

et al. 2019

Sustainability

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In this study, we utilized lime mud waste from paper mills to synthesize calcium hydroxide (Ca(OH)2) nanoparticles (NPs) and investigate their application for the removal of phosphorus from aqueous solution. The NPs, composed of green portlandite with hexagonal shape, were successfully produced using a precipitation method at moderately high temperature. The crystal structure and characterization of the prepared Ca(OH)2 nanoparticles were analyzed by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The effects of Ca(OH)2 NP dosage and contact time on removal of phosphorus were also investigated. The results show that the green portlandite NPs can effectively remove phosphorus from aqueous solution. The phosphorus removal efficiencies within 10 min are 53%, 72%, 78%, 98%, and 100% with the different mass ratios of Ca(OH)2 NPs/phosphorus (CNPs/P) of 2.2, 3.5, 4.4, 5.3, and 6.2, respectively. Due to the efficient phosphorus removal, the calcium hydroxide nanoparticles (CNPs) could be a potential candidate for this application in domestic or industrial wastewater treatment.

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Surface functional groups of carbon-based adsorbents and their roles in the removal of heavy metals from aqueous solutions: A critical review

Cited by 920 publications

References 213 publications

Past, present, and future of biochar

Past, present, and future of biochar

Chitosan-Based Bio-Composite Modified with Thiocarbamate Moiety for Decontamination of Cations from the Aqueous Media

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

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