Unraveling sorption of nickel from aqueous solution by KMnO4 and KOH-modified peanut shell biochar: Implicit mechanism

Hazardous wastes treatment technologies

“…The percentage removal of and maximum adsorption capacity for Ni(II) was >92.64% and 287.11 mg/g in 50 min of contact time at pH 6.07-7.71 and room temperature. An, Jiang, Nan, Yu, and Jiang (2019) treated peanut shell biochars with KMnO 4 and KOH for the adsorption of nickel(II) from wastewater. Surface modification of biochar increased the adsorption sites for nickel (II) and induced the formation of -NH 2 -Ni complexes, which led to nickel(II) adsorption capability of 87.15 mg/g.…”

Advances in Metal Recovery from Wastewaters Using Selected Biosorbent Materials and Constructed Wetland Systems

“…Thus far much of the work on the use of modified and unmodified biochars has been aimed at the recovery of many of the transition and heavy metals such as arsenic (As) [45], Cr [46,47,52], Cu [37,41,51], Pb [49,53,56], Cd [40,48], Zn [36], Ni [50], Hg [54] and U [57] from selected waste streams. Examples of the relative uptake of these metals by selected biochars can be seen in Table 5.…”

“…For example, adsorption of hexavalent chromium from aqueous solution was shown to rise significantly, with the presence of an increased number of amino groups being suggested to significantly enhance metal uptake onto a polyethyleneimine modified rice biochar [52]. Other scientific explanations for increased uptake of selected metals following modification of specific biochars, as outlined in Tables 4 and 5, include how a modification of peanut shell led to an increased specific surface area [53]; how treatment of corn straw biochar with sodium sulphide yielded more oxygen-containing functional groups on the surface [54]; how larger pore sizes, pore volumes, and more functional groups could be achieved with the treatment of wheat straw biochar with graphene oxide [55]; and how higher contents of surface carboxylate groups and ultimately negative surface charge on the modified biochar could be achieved with nitric acid treatment of cow manure biochar [57].…”

Facile preparation of porous biomass charcoal from peanut shell as adsorbent

“…Because of high density of oxygenated functional groups and low degree of condensation, the biomass waste can be tailored to produce carbon-based materials with desired characteristics for different functional applications. Especially activated carbons produced from biomass waste have been widely used in many fields, such as adsorbent 8 , 9 , supercapacitor 10 – 12 , oil–water separation 13 , resource recovery 14 and so on.…”

“…In the past years, numerous methods have been reported for the synthesis of activated carbon derived from peanut shells for different applications 8 , 10 , 13 , 16 . For example, Dey et al reported a process for the production of few-layer graphene from peanut shell for high-performance supercapacitor 17 .…”