Effect of oxidation-induced aging on the adsorption and co-adsorption of tetracycline and Cu2+ onto biochar

Nie, Tiantian; Hao, Pulin; Zhao, Zhendong; Zhu, Lizhong

doi:10.1016/j.scitotenv.2019.04.089

Cited by 64 publications

(18 citation statements)

References 47 publications

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“…It is worth mentioning that the adsorption capacity of NOB was less affected by the oxidation, which changed from 13.14 to 12.53 mg g –1 for NOB and MOB, respectively. These results show that high‐temperature biochars exposed to H 2 O 2 treatment have a tendency to decrease adsorption capacity, and similar trends have been reported before 10,20 . The implications of these results are explained and discussed in more detail in the next section.…”

Section: Resultssupporting

confidence: 81%

“…The pyrolysis process at temperatures below 500 °C produces a biochar with high oxygen content, increasing the number of functional groups, such as ‐COOH and ‐OH, while pyrolysis above 500 °C results in a biochar with a higher content of aromatic compounds and carbon, reducing the amount of hydrogen and oxygen 9 . However, a more condensed aromatic structure, high hydrophobicity, and mineral components might contribute to the high stability of biochar 10 . Studies also reported that only the biochars produced at a higher pyrolysis temperature (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…9 However, a more condensed aromatic structure, high hydrophobicity, and mineral components might contribute to the high stability of biochar. 10 Studies also reported that only the biochars produced at a higher pyrolysis temperature (e.g. 550°C) may persist for more than 100 years, which is why they may be more effective for long-term soil C storage.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the mechanisms of lead adsorption and ageing process on high‐temperature biochar

Encinas‐Vázquez

Quezada-Renteria

Cervantes

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The synthesis gas or hydrogen‐rich gas, at longer residence times and higher temperatures, is frequently the target of pyrolysis biomass. Biochars obtained at such conditions contain less functional groups but they are more effective for longer‐term soil C storage. The aim of this study was to elucidate the adsorption mechanisms and the effect of the ageing process on high‐temperature biochar towards lead adsorption. The biochars under study were produced from the pyrolysis of almond wood and olive tree pruning. RESULTS The almond hardwood biochar was the most susceptible to the oxidation process. This biochar exhibited higher carbon loss than the olive biochar, 22.07% and 11.76%, respectively. The adsorption process was better described by the Langmuir model and pseudo‐second order kinetics. The maximum adsorption capacity decreased from 40.3 to 24.8 mg g–1 after the oxidation process for almond‐derived biochar and remained unchanged for the olive‐biochar. Analyses demonstrated that 67% of the adsorbed Pb2+ was removed through complexation by oxygen functionalities and phosphorous compounds. After the oxidation process, this fraction accounted for only 45% of the adsorbed Pb2+, ion exchange and cation‐π being the most prominent mechanisms for the adsorption. CONCLUSION Biochar oxidation could cause the mobilization of 30% of the adsorbed lead under acid conditions. Special attention should be given to biochar's intrinsic properties, such as O/C and H/C ratio, for the application of these materials in the treatment of contaminated soil. High‐temperature biochars would offer the additional advantage of managing the remediation of scenarios with low pH. © 2020 Society of Chemical Industry (SCI)

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unraveling the mechanisms of lead adsorption and ageing process on high‐temperature biochar

Encinas‐Vázquez

Quezada-Renteria

Cervantes

et al. 2020

J of Chemical Tech & Biotech

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“…An isotherm study can describe the interaction between adsorbent and adsorbate under constant conditions. The obtained results were analyzed using Langmuir (Equation (3)) and Freundlich (Equation (4)) isotherm models:qe=qmCe1b+Ce qe=KCetrue1n where qe (mg/g) is the maximum adsorption capacity, Ce(mg/L) is the equilibrium ACT concentration, qm (mg/g) is the maximum adsorption capacity of ACT on adsorbents, and K and n are the Freundlich constants indicating adsorption capacity (mg/g) and the intensity of the adsorption, respectively [34].…”

Section: Resultsmentioning

confidence: 99%

Ultrasound-Assisted Preparation of Chitosan/Nano-Activated Carbon Composite Beads Aminated with (3-Aminopropyl)Triethoxysilane for Adsorption of Acetaminophen from Aqueous Solutions

et al. 2019

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A composite chitosan/nano-activated carbon (CS-NAC) aminated by (3-aminopropyl)triethoxysilane (APTES) was prepared in the form of beads and applied for the removal of acetaminophen from aqueous solutions. NAC and APTES concentrations were optimized to obtain a suitable adsorbent structure for enhanced removal of the pharmaceutical. The aminated adsorbent (CS-NAC-APTES beads) prepared with 40% w/w NAC and 2% v/v APTES showed higher adsorption capacity (407.83 mg/g) than CS-NAC beads (278.4 mg/g). Brunauer–Emmett–Teller (BET) analysis demonstrated that the surface area of the CS-NAC-APTES beads was larger than that of CS-NAC beads (1.16 times). The adsorption process was well fitted by the Freundlich model (R2 > 0.95), suggesting a multilayer adsorption. The kinetic study also substantiated that the pseudo-second-order model (R2 > 0.98) was in better agreement with the experimental data. Finally, it was proved that the prepared beads can be recycled (by washing with NaOH solution) at least 5 times before detectable performance loss.

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“…Chaabane, Beyou, El Ghali, and Baouab (2019) investigated the adsorption of Cu(II), Ni(II), and Co(II) onto graphene oxide (GO) chemically modified by bis(2-pyridylmethyl)amino groups (BPED) from water and reported that the adsorption capacity followed the order: Cu(II) > Ni(II) > Co(II) at pH 7. Nie, Hao, Zhao, Zhou, and Zhu (2019) also modified the surface of bamboo biochars, pyrolyzed at 400 and 600°C, by H 2 O 2 for the adsorption of tetracycline and Cu 2+ . H 2 O 2 oxidation treatment increased O-containing functional groups on the biochar surface, which might facilitate electrostatic attraction and complexation between Cu 2+ and biochar thus enhanced the performance on soil remediation, that is, the oxidized biochar surface formed complexes with Cu 2+ , which increased the adsorption capacity of tetracycline.…”

Section: Physical Treatmentmentioning

confidence: 99%

Hazardous wastes treatment technologies

Shih

et al. 2020

Water Environment Research

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Effect of oxidation-induced aging on the adsorption and co-adsorption of tetracycline and Cu2+ onto biochar

Cited by 64 publications

References 47 publications

Unraveling the mechanisms of lead adsorption and ageing process on high‐temperature biochar

Unraveling the mechanisms of lead adsorption and ageing process on high‐temperature biochar

Ultrasound-Assisted Preparation of Chitosan/Nano-Activated Carbon Composite Beads Aminated with (3-Aminopropyl)Triethoxysilane for Adsorption of Acetaminophen from Aqueous Solutions

Hazardous wastes treatment technologies

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