Study on adsorption of Cu2+, Pb2+, Cd2+, and Zn2+ by the KMnO4 modified biochar derived from walnut shell

Chen, S.; Zhong, Ming; Wang, H.; Zhou, Shuai; Li, W.; Wang, T.; Li, J.

doi:10.1007/s13762-022-04002-4

Cited by 23 publications

(3 citation statements)

References 57 publications

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“…The size of sorbents was not discussed so it may be assumed that the cause of these differences was only the different chemical modification. In KMnO 4 modified biochar derived from walnut shell Cu was adsorbed mainly by replacing the Mn 2+ in O-Mn and formed complexes with the surface functional groups (-OH, -COOH) according to FTIR and XPS analysis [49].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Cu(II) and Zn(II) Sorption onto Zeolite

et al. 2022

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In this study, a batch sorption study approach was combined with an instrumental analytical approach of atomic absorption spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) for the sorption of copper and zinc ions from aqueous solution on zeolites. Both copper and zinc are biogenic elements; nevertheless, many industrial processes produce an excessive amount, which is why their efficient removal from water must be studied. Two types of zeolites, Zeolite Micro 20 (Z-M20) and Zeolite Micro 50 (Z-M50), were used. The results showed that the maximum sorption capacities for removal of Cu and Zn were 1.06 for CuSO4, 42.35 for Cu(NO3)2, 1.15 for ZnSO4 and 2.29 for Zn(NO3)2 adsorption onto Z-M20 and 0.45 for CuSO4,1.67 for Cu(NO3)2, 0.39 for ZnSO4 and 1.51 for Zn(NO3)2 adsorption onto Z-M50. The maximum sorption capacities are higher for sulfates and the sorbent with smaller particle size. The sorption capacities of Cu and Zn for corresponding anion and particle size differ only up to 5–15%. Using XRD and XPS analyses before and after the sorption process, it was found that the content of both Cu and Zn in the surface layer and the bulk are the same for sorption onto sorbent with smaller particle size, but are higher in the surface layer than in the bulk for sorption onto sorbent with larger particle size. One of the main findings of this study is that a zeolite with smaller particles takes Cu and Zn by the whole particle, while with bigger particles, Cu and Zn concentrate in the surface of the particle. The results of the study may be used as an indicator for sorption efficiency of the studied zeolites for their application in the treatment of copper and zinc contaminated effluents.

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Section: Discussionmentioning

confidence: 99%

Characterization of Cu(II) and Zn(II) Sorption onto Zeolite

et al. 2022

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“…27 Adsorption is the easiest and least expensive method to employ, and it can increase effectiveness and be useful for metal concentrations at lower levels. 28 Activated carbon was previously used alone or with certain changes, 29 but now many researchers have focused on biochar adsorbents such as Argemone Mexicana for Zn(II), 30 peanut shell biochar, 31 and sagwan sawdust-derived biochar, 32 and others [33][34][35] with excellent results.…”

Section: Introductionmentioning

confidence: 99%

Excellent Cr(vi) adsorbent made from pyrolyzed green coconut trash with parametric modelling and optimization using RSM and experimental data

et al. 2023

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“…The results show that the speci c surface area and total pore volume of ZMFBC are 49 and 10.54 times larger than those of BC, respectively, and the pore size of ZMFBC is 0.214 times smaller than that of BC. Chen et al showed that the above results are conducive to improving the adsorption capacity(Chen et al 2023a). …”

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Adsorption of anionic and cationic heavy metals by Zn-Mn-Fe oxide-loaded biochar: Performance and mechanism

Fu,

Zhang,

et al. 2023

Preprint

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Biochar has a good heavy metal adsorption capacity, but it is difficult to separate the heavy metals from the biochar for reuse after application in wastewater treatment processes. To solve this problem, Zn-Mn-Fe oxide-loaded biochar (ZMFBC) was prepared in this study to fabricate magnetic biochar, and cationic heavy metals (Pb2+, Cd2+) and anionic heavy metals (Cr6+) were selected as target pollutants for removal. The ZMFBC adsorption performance and physicochemical properties were evaluated by combining batch experiments and characterization techniques. The results showed that the Pb2+, Cd2+ and Cr6+ maximum adsorption amounts obtained by ZMFBC were 136.99, 74.63 and 39.06 mg/g, respectively, and the adsorption processes were in accordance with pseudo-second order and the Langmuir model. Functional group could be the main reason for the high adsorption capacity of ZMFBC. With good heavy metal removal performance and easy separation, ZMFBC can be used in a variety of applications where adsorbents are needed to remove contaminants.

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Study on adsorption of Cu2+, Pb2+, Cd2+, and Zn2+ by the KMnO4 modified biochar derived from walnut shell

Cited by 23 publications

References 57 publications

Characterization of Cu(II) and Zn(II) Sorption onto Zeolite

Characterization of Cu(II) and Zn(II) Sorption onto Zeolite

Excellent Cr(vi) adsorbent made from pyrolyzed green coconut trash with parametric modelling and optimization using RSM and experimental data

Adsorption of anionic and cationic heavy metals by Zn-Mn-Fe oxide-loaded biochar: Performance and mechanism

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