Date seed derived biochar for Ni(II) removal from aqueous solutions

Abstract

Abstract. The purpose of this study was to investigate the adsorption characteristic of biochars derived from date seed for Ni 2+ ions removal from aqueous solutions. Two biochars were prepared by slow pyrolysis of date seed for 3 h at 450 °C (DSB450) and 550 °C (DSB550). The adsorption of Ni 2+ was carried out by batch experiments at room temperature. The effects of pyrolysis temperature, contact time, initial metal concentration, and solution pH were investigated. The results showed that biochar prepared at higher temperature (DSB550) had higher adsorption capacity of Ni 2+ from aqueous solution than biochar prepared at lower temperature (DBS450). Adsorption efficiency of Ni 2+ ions was pH dependent and the maximum adsorption was found to occur at pH around 6.0. To describe the equilibrium isotherms, the experimental results were analyzed by the Langmuir, and Freundlich isotherms. The adsorption isotherm for Ni 2+ by DSB550 was best fit to Langmuir isotherm with (R 2 = 0.94). The maximum adsorption capacity of Ni 2+ of DSB550 biochar was 0.609 mmol g í1 . Pseudo-first order, pseudo-second order, and intraparticle diffusion models were used to model the kinetic parameters and mechanism of adsorption process. The results showed that the adsorption kinetics of these biochars are well described by a pseudo-second order kinetic model with correlation coefficient (R 2 = 0.99). The results of the study indicated that biochar derived from date seed biomass is a suitable material for adsorption of Ni 2+ ion from aqueous solution.

Investigation of the kinetics and mechanisms of nickel and copper ions adsorption from aqueous solutions by date seed derived biochar

“…Similar observations were reported by other researchers [3,43]. Furthermore, DSB550-3 biochar exhibits a high ash content (12.67 %) with CEC of 1.897 meq L -1 [19] suggesting that the biochar may exhibit a high tendency to adsorb Cu 2+ and Ni 2+ by releasing other cations such as K + , Ca 2 + , and Mg 2 + .…”

“…In our previous studies, biochar derived from date seed biomass showed remarkable, adsorption capacities for MB removal from aqueous solution [18]; our preliminary study [19] also suggested a good potential for Ni adsorption. Therefore, date seed derived biochar may be an efficient low-cost adsorbent for heavy metals and dyes.…”

Potential of rice straw biochar, sulfur and ryegrass (Lolium perenne L.) in remediating soil contaminated with nickel through irrigation with untreated wastewater

“…These results join previous reports (Ali et al, 2020b;Mahdi, Qiming & Hanandeh, 2018;Pedrero et al, 2010;Rageh, 2014) in establishing the capacity of biochar to alleviate the content of heavy metals from contaminated soils. For examples, rice straw biochar has proven its efficiency in alleviating Ni 2+ toxicity and remediating Ni 2+ -contaminated soils by decreasing the Ni 2+ mobility and leachability in the soil (Ali et al, 2020a;Ali et al, 2020b), also date seed derived biochar has shown significant capacity to adsorb copper (Cu 2+ ) and Ni 2+ ions from aqueous solution, and the ions removal depended on the pyrolysis temperature and time used in biochar preparation and the biochar dose (Mahdi, El Hanandeh & Yu, 2017a;Mahdi, El Hanandeh & Yu, 2017b), moreover the biochar produced from wood waste revealed significant potential of Cu 2+ adsorption from the soil as well the Cu 2+ adsorption quantity increased with the increase of the biochar doses and pH value (Tomczyk, Boguta & Sokołowska, 2019). In other studies, it was previously reported that the adsorption capacity of biochar is related to its pH and cation exchange capacity (CEC) values.…”