Z. Zhao, M. Wu, Q. Jiang, Y. Zhang, X. Chang et al., Adsorption and desorption 439 studies of anthocyanins from black peanut skins on macroporous resins, Int. J. Food Eng, vol.11, pp.841-849, 2015.

Z. Zhou, Y. Liu, S. Liu, H. Liu, G. Zeng et al., , 2017.

, Sorption performance and mechanisms of arsenic(V) removal by magnetic gelatin-modified 443 biochar, Chem. Eng. J, vol.314, pp.223-231

A. Zieli?ska and P. Oleszczuk, The conversion of sewage sludge into biochar reduces 445 polycyclic aromatic hydrocarbon content and ecotoxicity but increases trace metal content, 2015.

, Biomass Bioenergy, vol.75, pp.235-244

W. Q. Zuo, C. Chen, H. J. Cui, and M. L. Fu, Enhanced removal of Cd(II) from aqueous 448 solution using CaCO 3 nanoparticle modified sewage sludge biochar, RSC Adv, vol.7, pp.16238-449, 2017.

D. Aran, A. Maul, and J. F. Masfaraud, A spectrophotometric measurement of soil cation 603 exchange capacity based on cobaltihexamine chloride absorbance, Comptes. Rendus. 604 Geosci, vol.340, pp.865-871, 2008.

W. Cheng, C. Ding, X. Wang, Z. Wu, Y. Sun et al., Competitive 606 sorption of As(V) and Cr(VI) on carbonaceous nanofibers, Chem. Eng. J, vol.293, pp.311-318, 2016.

A. Jouraiphy, S. Amir, M. El-gharous, J. C. Revel, and M. Hafidi, Chemical and 608 spectroscopic analysis of organic matter transformation during composting of sewage sludge 609 and green plant waste, Int. Biodeterior. Biodegrad, vol.56, pp.101-108, 2005.

Z. Liu and F. S. Zhang, Removal of lead from water using biochars prepared from 611 hydrothermal liquefaction of biomass, J. Hazard. Mater, vol.167, pp.933-939, 2009.

T. Mahmood, M. T. Saddique, A. Naeem, P. Westerho, and S. Mustafa, Comparison of 613 different methods for the point of zero charge determination of NiO, Ind. Eng. Chem. Res, vol.614, pp.10017-10023, 2011.

A. O. Tuna, E. Ozdemir, E. B. Simsek, and U. Beker, Removal of As(V) from aqueous 616 solution by activated carbon-based hybrid adsorbents, 2013.

, Chem. Eng. J, vol.223, pp.116-128

Y. Wang and R. Liu, H 2 O 2 treatment enhanced the heavy metals removal by manure biochar 619 in aqueous solutions, Sci. Total Environ, pp.1139-1148, 2018.

T. Wen, J. Wang, S. Yu, and Z. S. Chen, Magnetic porous carbonaceous material produced 621 from tea waste for efficient removal of As(V), Cr(VI), humic acid and dyes, 2017.

, Chem. Eng, vol.5, pp.4371-4380

K. Yoon, D. W. Cho, D. C. Tsang, N. Bolan, J. Rinklebe et al., Fabrication of 624 engineered biochar from paper mill sludge and its application into removal of arsenic and 625 cadmium in acidic water, Bioresour. Technol, vol.246, pp.69-75, 2017.

G. Zhao, J. Li, X. Ren, C. Chen, and X. Wang, Few-layered graphene oxide nanosheets as 627 superior sorbents for heavy metal ion pollution management, Environ. Sci. Technol, vol.45, pp.10454-10462, 2011.

Z. Zhao, M. Wu, Q. Jiang, Y. Zhang, X. Chang et al., Adsorption and desorption 630 studies of anthocyanins from black peanut skins on macroporous resins, Int. J. Food Eng, vol.11, pp.841-849, 2015.