Synthesis, characterization and application of surface-modified biochar synthesized from rice husk, an agro-industrial waste for the removal of hexavalent chromium from drinking water at near-neutral pH

Sarkar, Arpan; Ranjan, Ashish; Paul, Biswajit

doi:10.1007/s10098-018-1649-5

Cited by 38 publications

(9 citation statements)

References 65 publications

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“…Moreover, as compared to modified biochar, pristine biochar may have limited adsorption capacities; for instance, 20% H 2 O 2 activated biochar showed a higher copper adsorption (54 mg/g) than its pristine counterpart (36 mg/g) [ 77 ]. However, as compared to pristine biochar, the production of modified biochar can be more expensive, time consuming, complex and involve the use of chemicals; studies have indicated that the production cost can be as high as 37% of that of pristine biochar [ 78 , 79 ]. LF500 biochar seems to be a promising adsorbent for the removal of Cu 2+ , Fe 2+ , Ni 2+ and Zn 2+ according to the results of the batch and column studies performed.…”

Section: Resultsmentioning

confidence: 99%

Pristine biochar performance investigation to remove metals in primary and secondary treated municipal wastewater for groundwater recharge application

et al. 2022

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In this study, pristine biochar derived from date palm at 500°C was used in batch reactors (simulating blending adsorbent in aeration tank) and fixed-bed columns (simulating holding adsorbent in fixed-bed reactors). The removal performance of the biochar was assessed toward single and mixed-metal solutions as well as synthetic primary and secondary treated wastewater for copper (Cu2+), iron (Fe2+), nickel (Ni2+) and zinc (Zn2+). The order of maximum adsorption capacities of the metal ions at pH 7 followed: Fe2+ (2.92/2.94 mg/g)>Cu2+(2.69/2.78 mg/g) >Zn2+(2.03/2.19 mg/g)>Ni2+(1.69/1.02 mg/g) in single/mixed-metal solutions and Zn2+(2.91/11.26 mg/g)>Fe2+(0.60/5.29 mg/g)>Cu2+(0.56/5.05 mg/g)>Ni2+(0.13/2.02 mg/g) in synthetic primary/secondary treated wastewater. Blending biochar in aeration tank reduced metal concentrations. The metal ion concentrations in the final effluent were below the World Health Organization drinking water limits (2, 0.3, 0.1 and 3 mg/L for Cu2+, Fe2+, Ni2+ and Zn2+, respectively) suggesting that treated secondary wastewater can be spread into potable aquifers following disinfection. The Freundlich and the Pseudo-second order models fit best the batch experimental data. Experimental data from column analysis fit well to the Thomas model. The adsorption of metal ions on the surface of biochar was confirmed by Scanning electron microscopy, Energy dispersive X-ray studies, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction. Desorption studies using different eluents demonstrated the reusability potential of the studied biochar.

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Section: Resultsmentioning

confidence: 99%

Pristine biochar performance investigation to remove metals in primary and secondary treated municipal wastewater for groundwater recharge application

et al. 2022

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“…This is probably happening due to the enhanced rate of adsorption of arsenic (mostly As(V)) on the electrode surface as a consequence of an increased temperature, which is believed to be a favouring condition for the adsorption of arsenic on the materials the working electrode is made of . The adsorption of arsenic on the electrode might not reach equilibrium at a lower temperature (20 °C), which is perhaps not sufficient to provide the required thermal energy to overcome the barrier of diffusion . Whereas, a higher temperature (above 40 °C, here) provides the required energy to the oxyanions of arsenic to overcome the diffusion barrier to get adsorbed on the electrode surface.…”

Section: Resultsmentioning

confidence: 99%

Designing of Functionalized MWCNTs/Anodized Stainless Steel Heterostructure Electrode for Anodic Oxidation of Low Concentration As(III) in Drinking Water

Sarkar

Paul

et al. 2019

ChemistrySelect

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Considering the severe threat of arsenic contamination in drinking water on the life of millions of people around the world‐different technologies and materials have been employed throughout the ages to provide arsenic‐free drinking water. This work, demonstrates a facile fabrication of a low‐cost, bio‐friendly p‐type functionalized multiwalled carbon nanotubes (f‐MWCNTs)/n‐type anodized stainless steel (SS) hybrid material, which is used as an effective electrode for the easy and fast oxidation of arsenic(III) to arsenic(V), by applying relatively low positive voltage, to subsequently increase the proficiency of the process. This new material based technology used in this work is found very effective in oxidizing comparatively lower concentrations of arsenic (III) (<100 ppb) present in drinking water at 30 °C at a pH suitable for drinking water (6.5‐8.5). Fabrication of such interfacial band engineered nano‐hybrid electrode is beneficial to enhance the anodic current, which in turn, increases the As(III) oxidation. Based on the design of the electrode, the hole mediated anodic current is found to boost the oxidization of As(III). This technology could reduce the use of ultraviolet radiation and other use of costly oxidants for the oxidation of As(III) and thus can appear as a cost‐effective, energy‐efficient technique for the oxidizing of As(III) from drinking water.

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“…Biochar has been shown to adsorb and retain a higher level of heavy metals than other materials (Zhang et al 2013). Furthermore, because it is the most prevalent speciation process, the solid phase of Cr accounts for most Cr in the soil (Sarkar et al 2019). Thus, biochar significantly reduced chromium fractions, which may be due to their high cations exchange capacity (CEC) and surface area, which facilitates Cr adsorption.…”

Section: Organic Fraction Of Chromiummentioning

confidence: 99%

Influence of Soil Moisture and Bioamendments on the Speciation and Bioavailability of Chromium in Contaminated Soils

2022

IJE

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Chromium (Cr) is a strategic and dangerous heavy metal with many applications in the leather tanning and chemical industries. Cr has gained importance due to the greater understanding of its persistence and toxicity in ecosystems. To protect our environment from severe contamination threats, it is essential to remove Cr. But, before developing a remediation strategy, it is necessary to understand various factors and soil parameters that influence the bioavailability and fractionation of heavy metals. The investigation was conducted in a laboratory closed incubation experiment with bioamendments in a completely randomized design with three replications for 60 days. The study examined the impact of amendments like farmyard manure, composted poultry manure, pressmud compost, and biochar on Cr speciation in contaminated soil under different moisture conditions. The findings revealed that organic amendments substantially impacted soil chemical parameters such as pH, Cr mobility, and bioavailability. The significant reduction of bioavailable fractions was observed in biochar (75 to 80%) amended soil, followed by farmyard manure and poultry manure (60 to 70%). As a result, bioamendments can effectively reduce the bioavailability of Cr in contaminated soil and play a significant role in designing a bioremediation technology for the chromium contaminated soil.

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Synthesis, characterization and application of surface-modified biochar synthesized from rice husk, an agro-industrial waste for the removal of hexavalent chromium from drinking water at near-neutral pH

Cited by 38 publications

References 65 publications

Pristine biochar performance investigation to remove metals in primary and secondary treated municipal wastewater for groundwater recharge application

Pristine biochar performance investigation to remove metals in primary and secondary treated municipal wastewater for groundwater recharge application

Designing of Functionalized MWCNTs/Anodized Stainless Steel Heterostructure Electrode for Anodic Oxidation of Low Concentration As(III) in Drinking Water

Influence of Soil Moisture and Bioamendments on the Speciation and Bioavailability of Chromium in Contaminated Soils

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