Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal

Yang, Fan; Zhang, Shuaishuai; Sun, Yuqing; Cheng, Kui; Li, Jiangshan; Tsang, Daniel C.W.

doi:10.1016/j.biortech.2018.06.029

Cited by 276 publications

(60 citation statements)

References 42 publications

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“…Heavy metals are considered unique in their behavior in the sense that their complete removal from the environment is very difficult once they have entered it (Mahurpawar, ). Once released, heavy metals in the wastewater each have their own adverse effects on human health and aquatic life (Yang et al, ). Their presence in the environment for a long term may cause serious health effects to humans due to carcinogenic and mutagenic properties (Pearlin Kiruba et al, ).…”

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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“…The crystal structure of nZVI-ASBC was analyzed by XRD. Figure 3 shows a strong peak of 44.83 • (reference code: 00-003-1050) corresponding to the planes of iron [21]. The carbon peak was found at 2θ = 26.3 (reference code: 00-001-0640).…”

Section: Xrd and Xps Of Cr(vi)-fe (0) Reactionsmentioning

confidence: 99%

Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

Shu

Cui

et al. 2020

Nanomaterials

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Nano-zero-valent iron biochar derived from almond shell (nZVI-ASBC) was used for hexavalent chromium (CR) removal. Experiments showed that pH was the main factor (p < 0.01) that affected the experimental results. At a dosage of 10 mg·L−1 and pH of 2–6, in the first 60 min, nZVI-ASBC exhibited a removal efficiency of 99.8%, which was approximately 20% higher than the removal yield at pH 7–11. Fourier transform infrared spectroscopy results indicated N-H was the main functional group that influenced the chemisorption process. The pseudo second-order dynamics and Langmuir isotherm models proved to be the most suitable. Thermodynamic studies showed that the reaction was exothermic and spontaneous at low temperatures (T < 317 K). Various interaction mechanisms, including adsorption and reduction, were adopted for the removal of Cr(VI) using the nZVI-ASBC composite. The findings showed that the BC-modified nZVI prepared with almond shell exerts a good effect and could be used for the removal of Cr(VI).

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“…The peak around 21.38 could be attributed to well crystalline aliphatic carbon. 38 The broad peaks represented (110) and (200) planes of cellulose I. 39,40 The diffraction peak intensity of MBC200 was much weaker than that of PBC200 due to the oxidation of K 2 FeO 4 .…”

Section: Biochar Characterizationmentioning

confidence: 99%

Enhancing the adsorption capability of areca leaf biochar for methylene blue by K₂FeO₄-catalyzed oxidative pyrolysis at low temperature

et al. 2019

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Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal

Cited by 276 publications

References 42 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

Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

Enhancing the adsorption capability of areca leaf biochar for methylene blue by K₂FeO₄-catalyzed oxidative pyrolysis at low temperature

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Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal

Cited by 276 publications

References 42 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

Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

Enhancing the adsorption capability of areca leaf biochar for methylene blue by K2FeO4-catalyzed oxidative pyrolysis at low temperature

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Enhancing the adsorption capability of areca leaf biochar for methylene blue by K₂FeO₄-catalyzed oxidative pyrolysis at low temperature