Enhanced adsorption of anionic phenol red using cationic polyethylenimine-incorporated chitosan beads

Lau, Kam Sheng; Chin, Siew Xian; Khiew, Poi Sim; Zakaria, Sarani; Yin, Michelle Lee Jia; Key, Kelly Hong Mun; Chia, Chin Hua

doi:10.1007/s10934-022-01198-1

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…As an efficient and environmentally friendly method [ 15 ], the adsorption method requires an expensive adsorbent, which limits its use [ 16 ]. Research for environmentally friendly, economic, sustainable, and highly efficient adsorbent is of importance [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

A Stable Fe-Zn Modified Sludge-Derived Biochar for Diuron Removal: Kinetics, Isotherms, Mechanism, and Practical Research

Liu

Wang

et al. 2023

Molecules

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To remove typical herbicide diuron effectively, a novel sludge-derived modified biochar (SDMBC600) was prepared using sludge-derived biochar (SDBC600) as raw material and Fe-Zn as an activator and modifier in this study. The physico-chemical properties of SDMBC600 and the adsorption behavior of diuron on the SDMBC600 were studied systematically. The adsorption mechanisms as well as practical applications of SDMBC600 were also investigated and examined. The results showed that the SDMBC600 was chemically loaded with Fe-Zn and SDMBC600 had a larger specific surface area (204 m2/g) and pore volume (0.0985 cm3/g). The adsorption of diuron on SDMBC600 followed pseudo-second-order kinetics and the Langmuir isotherm model, with a maximum diuron adsorption capacity of 17.7 mg/g. The biochar could maintain a good adsorption performance (8.88–12.9 mg/g) under wide water quality conditions, in the pH of 2–10 and with the presence of humic acid and six typical metallic ions of 0–20 mg/L. The adsorption mechanisms of SDMBC600 for diuron were found to include surface complexation, π–π binding, hydrogen bonding, as well as pore filling. Additionally, the SDMBC600 was tested to be very stable with very low Fe and Zn leaching concentration ≤0.203 mg/L in the wide pH range. In addition, the SDMBC600 could maintain a high adsorption capacity (99.6%) after four times of regeneration and therefore, SDMBC600 could have a promising application for diuron removal in water treatment.

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Section: Introductionmentioning

confidence: 99%