Reusable magnetically-modified Enteromorpha prolifera-based biochar hydrogels: competitive removal mechanism for metal-organic dye composite contaminants

作者：Zihan Song, Yonglin Liu, Lin Liu, Chuanxi Yang, Wei Tian, Baorong Duan, Fang Xu, Yunke Ren, Mingkun Zhang, Si Xiong, Yuzhuo Gong, Haofen Sun, Weiliang Wang · 发表于：Carbon Research · 年份：2024 · DOI：10.1007/s44246-023-00098-6 · 被引用次数：16 · 研究领域：Adsorption and biosorption for pollutant removal、Phosphorus and nutrient management、Nanomaterials for catalytic reactions

Abstract Dyes and heavy metals pollute the environment. Biochar-based hydrogel is an excellent adsorbent, but the competitive adsorption mechanism associated with the removal of pollutants using biochar is yet to be understood in detail. Biochar was prepared following the process of high-temperature lysis of marine green tide ( Enteromorpha prolifera ). The prepared biochar was cross-linked with water-soluble chitosan and compounded with nano-Fe 3 O 4 to synthesize magnetically-modified Enteromorpha prolifera -based biochar hydrogel (MM-EBC-HD). The competitive removal performance of the hydrogel was studied, and the pollutant removal mechanism was analyzed against a binary system consisting of common environmental pollutants (methyl orange [MO] and hexavalent chromium [Cr (VI)]. The physical and chemical properties of the composites were studied before and after contaminant removal, and the associated pollutant removal mechanisms were analyzed by SEM, EDS, FTIR, XRD, and XPS techniques. The effects of pH, temperature and initial pollutant concentration on the adsorption performance of the materials were examined. The maximum adsorption of MO on MM-EBC-HD was 71.18 mg g −1 , and adsorption equilibrium was attained at approximately 60 min. Electrostatic forces, hydrophobic bonds, and hydrogen bonds were exploited for MO adsorption. And the maximum adsorption amount of Cr (VI) was recorded to be 115.41 mg g −1 , and equilibrium was attained in approximately 10 min. Electrostati...