Recycling of rice straw through pyrolysis and its adsorption behaviors for Cu and Zn ions in aqueous solution

Park, Jong‐Hwan; Wang, Jim J.; Kim, Seong‐Heon; Cho, Ju-Sik; Kang, Sewon; DeLaune, Ronald D.; Han, Kun‐Jun; Seo, Dong‐Cheol

doi:10.1016/j.colsurfa.2017.08.041

Cited by 90 publications

(35 citation statements)

References 49 publications

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“…Similar to the precipitation, ionexchange produced the largest contribution to total adsorption for CMB (47.61%), though its importance was decreased slightly in M-CMB (23.89%). This situation seemed fairly comparable to the finding, in which the heavy metal adsorption by dairy-manure biochar was mainly attributed to the precipitation with PO4 3− and CO3 2− [51], and the adsorption by rice-straw biochar was closely related to the exchangeable cations [50], respectively. Thus, the precipitation and ion-exchange dominated the adsorption for both biochars, jointly contributing 92.79% in CMB and 94.95% in M-CMB to total adsorption.…”

Section: Relative Distribution Of Adsorption Mechanismssupporting

confidence: 88%

“…The unfamiliar reduction state of P was detected as CdP 2 after adsorption, which might be resulted from the release of CH 4 , H 2 and CO during pyrolysis [48]. Among these precipitates, such as CdCO 3 , Cd 3 (PO 4 ) 2 , CdSiO 3 , Cd(OH) 2 and CdS, were probably due to high concentrations of CO 3 2− , PO 4 3− , S and Si content in the original biochars ( Figure 1 and Table 1), which were also observed in the previous studies on the heavy metal adsorption by the biochars [1,49,50]. In particular, the precipitates of CdFe 2 O 4 were detected on the surface of M-CMB after adsorption, which could be attributed to the presence of Fe 3 O 4 particles, generating adsorption sites for metal ions [6,10].…”

Section: Metal Precipitationsupporting

confidence: 75%

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Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Huang

Zhang

et al. 2020

IJERPH

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The present study investigated the adsorption of Cd2+ by nonmagnetic and magnetic biochars (CMB and M-CMB) derived from chicken manure, respectively. The adsorption characteristics were investigated as a function of initial pH, contact time, initial Cd2+ concentration and magnetic separation. Adsorption process of both biochars were better described by Pseudo-second-order kinetic equation and Freundlich isotherm model, which were spontaneous and endothermic in nature. It was found that maximum capacities were 60.69 and 41.07 mg/g obtained at the initial Cd2+ concentration of 180 mg/L for CMB and M-CMB, and the turbidity of adsorption-treated solution was reduced from 244.3 to 11.3 NTU after magnetic separation of 0.5 min. These indicated that M-CMB had lower adsorption capacity of Cd2+ than CMB, though it was successfully separated from the treated solutions. Furthermore, both biochars before and after adsorption were analyzed by SEM-EDS, XRD and FTIR. Adsorption mechanisms mainly included precipitation, ion-exchange, complexation and Cπ-coordination, in which precipitation and ion-exchange dominated the adsorption process by CMB, while in M-CMB, precipitation was always predominant mechanism, followed by ion-exchange. The two other mechanisms of complexation and Cπ-coordination were trivial in both biochars, jointly contributing 7.21% for CMB and 5.05% for M-CMB to total adsorption. The findings deepen our understanding of the mechanisms governing the adsorption process, which are also important for future practical applications in the removal of heavy metals from wastewater by the biochars.

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Section: Relative Distribution Of Adsorption Mechanismssupporting

confidence: 88%

Section: Metal Precipitationsupporting

confidence: 75%

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Huang

Zhang

et al. 2020

IJERPH

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“…Peaks were observed at 794, 1050, 1150, 1240, 1440, 1514, 1600, 2870 and 2930 cm −1 in lignin before MG adsorption, which were attributable to aromatic C-H stretching, symmetric C-O stretching, asymmetric C-O stretching, O-H bending, aromatic C=C stretching, secondary aromatic amines, aromatic vibration, symmetric C-H stretching and asymmetric C-H stretching, respectively [52][53][54]. The peak assigned at 794 cm −1 in lignin before MG adsorption shifted to 813 cm −1 after adsorption, suggesting that the aromatic group on lignin surface was increased due to adsorption of MG.…”

Section: Functional Group Variation In Lignin Before and After Mg Adsmentioning

confidence: 99%

Sorption behavior of malachite green onto pristine lignin to evaluate the possibility as a dye adsorbent by lignin

et al. 2019

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The objective of this study was to evaluate the adsorption characteristics of malachite green (MG) on pristine lignin as a dye adsorbent. The adsorption capacity of MG on lignin (31.2 mg/g) was described by Langmuir isotherm and pseudo second order models, and were higher than humic acid (6.4 mg/g). The adsorption of MG by lignin was rapid occurring within 15 min of the reaction, and then equilibrium was reached. The adsorption of MG by lignin based on an intraparticle diffusion model indicated that it was dominated by external boundary. Removal of MG by lignin can be applied at a wide range of pH's (2-5), and optimal lignin dosage for MG removal was 3 g/L. In addition, the desorption efficiency of MG adsorbed on lignin was highest in methanol + acetic acid (95:5%, v/v) mixture of all solutions tested. The peaks attributed to the hydrogen-bonded stretching vibrations and sulphonyl groups in lignin before MG adsorption, were assigned at about 3400 and 620 cm −1 , while the peaks in lignin after MG adsorption were attenuated or reduced. This result indicates that the adsorption of MG by lignin is closely related to the O-H and SO bonds. Finally, this study suggests that pure lignin, which excludes active processes, can also be used as an adsorbent for dyes. However, in order to utilize the dye-adsorbed lignin repeatedly, further studies will be needed.

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“…Because of large surface area and abundant functional groups, biochar is a promising adsorbent for removing heavy metals. Various wastes, including sesame straw [15], marine macro-algal [16], rice straw [17], sugar cane bagasse and orange peel [18], were used to prepare biochar for adsorp tion of heavy metals. In general, biochar has limited adsorption capacity, and surface modifications can improve adsorption performance of biochar for removing heavy metals, such as chemical modification and nano-particle loading.…”

Section: Introductionmentioning

confidence: 99%

Pb(II) removal from aqueous solution by cold KOH activated biochar of camphor leaves: isotherms, kinetics and thermodynamics

Cui¹,

Wang²,

Zhang³

2019

Desalination and Water Treatment

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a b s t r a c tBiochar from camphor leaves was activated by low-cost cold KOH process (ABC) to improve Pb(II) removal from aqueous solution. Then ABC was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and N 2 adsorption-desorption to reveal the benefits of cold KOH activation. The high adsorption capacity of ABC mainly results from oxygen-containing groups, porous structure and large surface area. Effect of factors including dose of ABC, pH, ionic strength, adsorption time, and temperature on Pb(II) adsorption was investigated by monofactor experiments. Through comparison with biochar (BC), optimization of ABC adsorption was revealed by kinetics, isotherms and thermodynamics. Pb(II) adsorption onto ABC is well described by pseudo-second-order kinetics and Langmuir isotherm, implying that chemisorption and monolayer adsorption are the rate-limiting steps. The thermodynamics indicates that Pb(II) adsorption onto ABC is spontaneous and exothermic. After cold KOH activation, the maximum adsorption capacity of Pb(II) onto ABC is 90.09 mg g -1 , higher than 62.27 mg g -1 of BC. ABC has an excellent dynamic and thermodynamic performance comparing with BC.

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Recycling of rice straw through pyrolysis and its adsorption behaviors for Cu and Zn ions in aqueous solution

Cited by 90 publications

References 49 publications

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Sorption behavior of malachite green onto pristine lignin to evaluate the possibility as a dye adsorbent by lignin

Pb(II) removal from aqueous solution by cold KOH activated biochar of camphor leaves: isotherms, kinetics and thermodynamics

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