生物炭
吸附
有孔小珠
化学
化学工程
朗缪尔吸附模型
体积热力学
色谱法
核化学
材料科学
有机化学
复合材料
热解
工程类
物理
量子力学
作者
Dhirar Ben Salem,Abdelkader Ouakouak,Fouzia Touahra,Noureddine Hamdi,Abdelazeem S. Eltaweil,Asad Syed,Raj Boopathy,Hai Nguyen Tran
标识
DOI:10.1016/j.biortech.2023.129225
摘要
This work aimed to develop innovative material by combining properties of magnetic-biochar (derived from peanut shells) and hydrogel bead (MBA-bead) and apply it for adsorbing Cu2+ in water. MBA-bead was synthesized by physical cross-linking methods. Results indicated that MBA-bead contained ∼90% water. The diameter of each spherical MBA-bead was approximately 3 mm (wet form) and 2 mm in (dried form). Its specific surface area (262.4 m2/g) and total pore volume (0.751 cm3/g) were obtained from nitrogen adsorption at 77 K. X-ray diffraction data confirmed Fe3O4 presented in magnetic-biochar and MBA-bead. Its Langmuir maximum adsorption capacity for Cu2+ was 234.1 mg/g (30 °C and pHeq 5.0). The change in standard enthalpy (ΔH°) of the adsorption was 44.30 kJ/mol (dominant physical adsorption). Primary adsorption mechanisms were complexation, ion exchange, and Van der Waals force. Laden MBA-bead can be reused several cycles after desorbing with NaOH or HCl. The cost was estimated for producing PS-biochar (0.091 US$/kg), magnetic-biochar (0.303–0.892 US$/kg), and MBA-bead (1.369–3.865 US$/kg). MBA-bead can serve as an excellent adsorbent for removing Cu2+ ions from water.
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