Preparation of Modified Watermelon Biochar and Its Adsorption Properties for Pb(Ⅱ)

被引：3

作者：

Bi J.-W. ^{[1
,2
,3
]}

Shan R. ^{[2
,3
]}

Han J. ^{[1
,2
,3
]}

Yuan H.-R. ^{[2
,3
]}

Shi Y.-Y. ^{[2
,3
]}

Zhang X.-Q. ^{[4
]}

机构：

[1] School of Engineering Science, University of Science and Technology of China, Hefei

[2] Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou

[3] Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou

[4] Chongqing Environment & Sanitation Group Co., Ltd., Chongqing

来源：

Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 04期

关键词：

Adsorption; Ammonium sulfide; Cycle; Modification; Pb(Ⅱ) ions; Watermelon biochar;

D O I：

10.13227/j.hjkx.201909165

中图分类号：

学科分类号：

摘要：

In this study, watermelon rind was used as a raw material to modify watermelon rind biochar (MBC) with ammonium sulphate [(NH4)2S] for adsorption of Pb(Ⅱ) ions. The effects of solution pH, adsorption time, adsorbent addition amount, initial mass concentration of Pb(Ⅱ) ions, and ionic strength on the adsorption of Pb(Ⅱ) ions were investigated. The results show that the saturated adsorption time was 5 h, the optimum pH of the adsorption reaction was 6, and when the initial mass concentration of Pb(Ⅱ) ions were 1 000 mg•L-1, and the amount of adsorbent was 2.0 g•L-1. The maximum adsorption amount of MBC to Pb(Ⅱ) ions can reach 97.63 mg•g-1, which is significantly higher than unmodified watermelon husk biochar (BC). The adsorption of Pb(Ⅱ) ions by modified watermelon biochar was in accordance with the Langmuir isotherm adsorption model and the pseudo second-order kinetic model, which proves that adsorption is dominated by monolayer chemical adsorption. The desorption of MBC after adsorption of Pb(Ⅱ) ions was carried out using a sodium hydroxide solution to study the reusability of MBC, and the adsorption amount was still 64.74 mg•g-1 in the sixth cycle. Characterization and analysis of adsorbents by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, nitrogen adsorption, scanning electron microscopy-energy spectroscopy, zeta potential analysis, and X-ray diffraction (XRD) were carried out, which showed that the adsorption mechanism is mainly that MBC oxygen- and MBC sulfur-containing groups adsorb Pb(Ⅱ) through complexation and precipitation. Therefore, ammonium sulfide modified watermelon rind biochar can be used as a highly efficient lead adsorbent. © 2020, Science Press. All right reserved.

引用

页码：1770 / 1778

页数：8

共 30 条

[1]

Chen H.M., Zhang J.W., Tang L.Y., Et al., Enhanced Pb immobilization via the combination of biochar and phosphate solubilizing bacteria, Environment International, 127, pp. 395-401, (2019)

[2]

Xia Y., Yang T.X., Zhu N.M., Et al., Enhanced adsorption of Pb(Ⅱ) onto modified hydrochar: modeling and mechanism analysis, Bioresource Technology, 288, (2019)

[3]

Mohsen-Nia M., Montazeri P., Modarress H., Removal of Cu<sup>2+</sup> and Ni<sup>2+</sup> from wastewater with a chelating agent and reverse osmosis processes, Desalination, 217, 1-3, pp. 276-281, (2007)

[4]

Silva J.E., Paiva A.P., Soares D., Et al., Solvent extraction applied to the recovery of heavy metals from galvanic sludge, Journal of Hazardous Materials, 120, 1-3, pp. 113-118, (2005)

[5]

Esalah J., Husein M.M., Removal of heavy metals from aqueous solutions by precipitation-filtration using novel organo-phosphorus ligands, Separation Science and Technology, 43, 13, pp. 3461-3475, (2008)

[6]

Lo S.F., Wang S.Y., Tsai M.J., Et al., Adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons, Chemical Engineering Research and Design, 90, 9, pp. 1397-1406, (2012)

[7]

Pang F.M., Kumar P., Teng T.T., Et al., Removal of lead, zinc and iron by coagulation-flocculation, Journal of the Taiwan Institute of Chemical Engineers, 42, 5, pp. 809-815, (2011)

[8]

Chen B.L., Chen Z.M., Sorption of naphthalene and 1-naphthol by biochars of orange peels with different pyrolytic temperatures, Chemosphere, 76, 1, pp. 127-133, (2009)

[9]

Liu Z.G., Zhang F.S., Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass, Journal of Hazardous Materials, 167, 1-3, pp. 933-939, (2009)

[10]

Shi Y.Y., Shan R., Yuan H.R., Effects and mechanisms of methyl orange removal from aqueous solutions by modified rice shell biochar, Environmental Science, 40, 6, pp. 2783-2792, (2019)

← 1 2 3 →