Removal of methylene blue from aqueous solution by modified bamboo hydrochar

Qian, Wei-Cong; Luo, Xubiao; Wang, Xing; Guo, Ming; Li, Bing

doi:10.1016/j.ecoenv.2018.03.088

Cited by 172 publications

(61 citation statements)

References 60 publications

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“…Additionally, the maximum adsorption capacities of MB and heavy metals on the ACs compared with carbonaceous materials reported in the literature are listed in Table 7 [38][39][40][41][42][43]. It can be seen that the adsorption capacities of the ACs prepared in this work are equally good or even superior to those reported in other studies.…”

Section: Comparison Of Adsorption Mechanismsmentioning

confidence: 55%

Activated Carbons Derived from Teak Sawdust-Hydrochars for Efficient Removal of Methylene Blue, Copper, and Cadmium from Aqueous Solution

Nguyen

Tran

Chao

et al. 2019

Water

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Recycling materials from waste has been considered one of the essential principles in the context of sustainable development. In this study, we used teak sawdust as the feedstock material to synthesize activated carbon (AC) samples and evaluated the application of these ACs in the adsorption of methylene blue (MB), Cd(II), and Cu(II). The sawdust was carbonized by a hydrothermal process, followed by chemical activation using K2CO3 or ZnCl2 in various weight ratios. The AC samples produced were characterized by scanning electron microscopy, Brunauer–Emmett–Teller surface area analysis, Fourier-transform infrared spectroscopy, X-ray photon spectroscopy, and mass titration of acidic groups. The characterization results showed that the ACs did possess a high surface area and rich oxygen-containing functional groups. The adsorptive amounts of MB, Cd(II), and Cu(II) on ACs approximately increased with the concentration of the activating agent: when the weight ratio of the carbonaceous material to ZnCl2 reached 1.75, the maximum adsorption capacities for MB, Cd(II), and Cu(II) were achieved, and the values were 614, 208, and 182 mg/g, respectively. The level of oxygen-containing functional groups was identified as an important factor in determining the adsorptive amounts. While the electrostatic force was the primary pathway that led to the adsorption of the tested contaminants onto the AC, the complexation reaction was a vital mechanism responsible for the adsorptive interaction between ACs and Cu(II). The high adsorption capacity of the synthetic ACs for MB, Cd(II), and Cu(II) demonstrated in this study points out the potential application of biomass-residue-based adsorbents prepared via a coupled hydrothermal carbonization/chemical activation process in wastewater treatment.

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Section: Comparison Of Adsorption Mechanismsmentioning

confidence: 55%

Activated Carbons Derived from Teak Sawdust-Hydrochars for Efficient Removal of Methylene Blue, Copper, and Cadmium from Aqueous Solution

Nguyen

Tran

Chao

et al. 2019

Water

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“…The hydrochar produced by HTC of orange peels is proved to adsorb three pharmaceuticals (diclofenac sodium, salicylic acid, and flurbiprofen) contaminants from water very effectively after treatment with phosphoric acid under the flows of CO 2 , which primarily depended on the porosity of the adsorbent material [35]. [121] demonstrated the removal of methylene blue from modified bamboo hydrochar.…”

Section: Removal Of Organic Wastes Including Dyes and Drugsmentioning

confidence: 99%

A Comprehensive Review on Hydrothermal Carbonization of Biomass and its Applications

et al. 2019

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Hydrothermal carbonization (HTC) has gained a lot of interest in the last few years for the process production of hydrochar from the different kinds of biological materials such as agricultural waste. Therefore, a thorough review of the literature on HTC has been conducted, which is more energy-efficient and involves hydrochar preparation at a lower temperature without any specific requirements for pressure. This review article primarily differentiates between the hydrochar and biochar developed from various sources. Also, a comparative analysis has been done to evaluate the maximum efficiency of hydrochar production. The various parameters, which influence the hydrochar yield to include pH, temperature, the concentration of the modifying agent, duration of exposure, salt, and phenolic compounds, have also been highlighted in this review. The scale-up processes for industrial level hydrochar production, along with bioreactor designs, have also been discussed. We have also focused on various applications of hydrochar, such as adsorbent in wastewater treatment, carbon sequestration, gas adsorption and in the field of agriculture for soil amendment. The adsorption effects of hydrochar towards the partial and proportionate adsorption of heavy metals and hazardous chemicals have been depicted. This review of the literature clearly illustrates the role of HTC in environmental remediation of soil, air and water and its usage in various industries.

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“…In this manner, the issues of carbon synthesis under sustainable conditions was as of late returned to and actualized by a few terms, where catalytic treatment of biomass relatively in the mild condition provided bulk, mesoporous or nanostructured chars. Moreover, the suitability of both biochar and hydrochars can be improved through chemical activation via HCl [14], ZnCl 2 [1], H 3 PO 4 [2], KOH [15], etc., since they provide high surface area and high porosity [16]. In this regard, several literature works have reported the performance of various agricultural wastes such as rice husk [17], Perennial grass [18], wheat straw [19], etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and cost analysis of activated biochar and hydrochar derived from agricultural waste: a comparative study

et al. 2019

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Utilization of low-cost, abundant and biomaterials is highly recommended for sustainable environment protection. This study presents a comparative analysis on the preparation, characterization and cost analysis of the novel activated biochar (BTS) and activated hydrochar (HTS). Teff (Eragrostis tef) straw was used as a precursor for producing BTS and HTS through pyrolysis and hydrothermal carbonization process, respectively. Both chars were further activated using 30 wt% H 3 PO 4 for 3 h activation time. The physicochemical properties of both chars were compared by different characterization techniques including BET, FTIR, XRD, SEM, and TGA. Briefly, BTS exhibited heterogeneous surface structures and comparatively larger specific surface area (627.7 m 2 /g) than that of HTS (43.8 m 2 /g) with the smooth coalesced carbon layer and dull surface edges. The XRD analysis revealed the amorphous character of HTS which is dominantly composed of AlPO 4 , whilst indicating BTS to be the crystalline structure with the very trivial amount of impurities. The oxygen-containing functional groups increased for HTS in comparison to BTS. Thermogravimetric analysis showed that HTS exhibited better thermal behaviors. Estimated costs incurred in the production of the HTS were found to be cheaper than compared to BTS. Overall, the experiment result suggested that Teff straw could have the potential for producing a low cost activated chars.

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Removal of methylene blue from aqueous solution by modified bamboo hydrochar

Cited by 172 publications

References 60 publications

Activated Carbons Derived from Teak Sawdust-Hydrochars for Efficient Removal of Methylene Blue, Copper, and Cadmium from Aqueous Solution

Activated Carbons Derived from Teak Sawdust-Hydrochars for Efficient Removal of Methylene Blue, Copper, and Cadmium from Aqueous Solution

A Comprehensive Review on Hydrothermal Carbonization of Biomass and its Applications

Preparation, characterization and cost analysis of activated biochar and hydrochar derived from agricultural waste: a comparative study

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