Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Abstract

Biochar adsorbents used to treat different heavy metals in water are efficient and low-cost. Appropriate raw materials, excellent selectivity and detailed adsorption mechanism are of important for research on biochar adsorbents. In this work, konjac starch was dispersed in polyvinylpyrrolidone (PVP) solution to prepare different sizes hydrophilic carbon spheres (HCSs) by hydrothermal synthesis method. Adsorption kinetics of the HCSs towards Pb2+ is described perfectly by the pseudo-second-order equation. With the temperature increasing, adsorption thermodynamics are more consistent with the Freundlich model. The calculated ΔG, ΔH and ΔS shows the adsorption of the HCSs towards Pb2+ is a spontaneous, endothermic and entropy increase process. In addition, HCSs have excellent selectivity for the adsorption of Pb2+ and Cu2+. HCSs prepared from konjac starch make full use of natural biomass resources, they can be used as a potential adsorbent material in treatment on heavy metal ion from water field.

Effect of Milling on Forest Residue-Derived Biochar with High Energy Milling Ellipse 3 Dimension

“…The initial and post-treated biochar contained CC aromatic, CO carboxyl, hydroxyl, CH aliphatic, and CH carbonate groups. The broad absorption at wave number 3200-3600 cm -1 and concentrated at 3415 cm -1 is the confirmed stretching of the hydroxyl group on the entire spectrum [14][15][16]. At the same time, the wave numbers 2915 cm -1 and 2848 cm -1 were confirmed as symmetrical aliphatic CH stretching of CHx [19].…”

“…Equations ( 1) and ( 2) calculate adsorption capacity and efficiency values. qe is the amount of adsorbed heavy metals ion per unit mass of adsorbent in equilibrium (mg/g), co is the initial concentration of heavy metal ion (mg/L), ct is the concentration of a heavy metal ion in time t (mg/L), m is the mass of the adsorbent (g), and V is the volume of the solution (L) [4], [15]. qe,t = ((c0 -ce,t).…”

M2+(Ni, Cu, Zn)/Al-LDH Composites with Hydrochar from Rambutan Peel and Study the Adsorption Efficiency for Organic Dyes

“…Therefore, industrial waste treatment needs to be carried out to reduce the concentration of waste before being discharged into the environment. To overcome pollution in wastewater, various methods can be used such as adsorption, photocatalytic separation (Karagöz et al, 2008), membrane processes, coagulation, biodegradation (Li et al, 2020a), flocculation (Li et al, 2020b), aerobic and anaerobic treatment, ion exchange and electrochemistry (Ebadollahzadeh and Zabihi, 2020). Among them, the simplest, cheapest, and most effective wastewater treatment process is adsorption Citation: Mohadi R, Normah, Palapa NR, Lesbani A. M 2+ (Ni, Cu, Zn)/Al-LDH composites with hydrochar from rambutan peel and study the adsorption efficiency for organic dyes.…”

Pb(II) Ion Removal Potential in Chemically Modified Ziziphus joazeiro Barks

“…The Pb(II) ion is considered as one of the most dangerous toxic metals for the ecosystem and is frequently studied in adsorptive assays testing raw or chemically modified vegetal materials [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Its removal from effluents produced from activities in the manufacture of ceramics, paints, plastics, automotive parts and batteries is extremely important to avoid problems in the aquatic environment, due to its bio-accumulative, non-biodegradable characteristics and its toxicity to plants and animals occurring even at low concentrations [ 50 , 51 , 52 ].…”