MIL-53-Fe metal–organic framework (MOF) was grown using the terephthalic acid linker and FeCl₃ into an already prepared, high surface area, magnetic, Douglas fir biochar/Fe₃O₄ (MBC) adsorbent hybrid. This resulting triphase hybrid, multifunctional, magnetically recoverable, sorptive, photocatalytic and degradative, adsorbent (MOF–MBC) was used both to remove and catalyze the photodegradation of Rhodamine B (Rh B) with or without Cr⁶⁺ present. Rh B is a widely used colorant in textile, printing and tanning industries that is also associated with deleterious health effects. Batch aqueous sorption studies were performed at various pHs, Rh B concentrations and temperatures in-order to determine the optimum adsorption pH, kinetics, thermodynamics and sorption capacity. This adsorption followed pseudo-2nd-order kinetics and exhibited a Rh B Langmuir adsorption capacity of ~ 55 mg/g at pH 6, 200 rpm agitation and 25 °C. This MOF–MBC hybrid was characterized by SEM, TEM, EDS, XRD, FT-IR, TGA, BET, Elemental Analysis and XPS. Deethylated and carboxylic compounds were identified as photodegradation intermediates. Electrostatic and π–π stacking interactions are thought to play a significant role in Rh B sorption. Hexavalent chromium (Cr⁶⁺) and Rh B often co-exist in tannery and printing waste water. Cr⁶⁺ can trigger the photo-degradation of Rh B into CO₂ and H₂O in the presence of both MIL-53-Fe MOF and MOF–MBC. Hence, adsorbent stripping regeneration can be minimized in real world applications. The biochar phase, aids to disperse the MOF, to minimize particle aggregation, to provide extra stability to the MOF, and serves as secondary adsorption site for heavy metal, oxy anion and organic contaminants. Large biochar particles allow reasonable flow through column beds while supporting other nanophases, which would cause large pressure drops when used alone.

中文翻译：

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罗丹明B对MIL-53-Fe MOF /磁性磁铁矿/生物炭复合材料的吸附去除和光催化降解

使用对苯二甲酸接头和FeCl ₃将MIL-53-Fe金属-有机骨架（MOF）生长到已经制备的高表面积磁性道格拉斯冷杉生物炭/ Fe ₃ O ₄（MBC）吸附剂混合物中。由此产生的三相杂化，多功能，可磁回收，吸附，光催化降解性吸附剂（MOF–MBC）用于去除和催化有或没有Cr ⁶⁺的罗丹明B（Rh B）的光降解。当下。Rh B是在纺织，印刷和制革业中广泛使用的着色剂，还与有害健康影响相关。为了确定最佳的吸附pH，动力学，热力学和吸附容量，在各种pH，Rh B浓度和温度下进行了分批的水性吸附研究。该吸附遵循伪二级动力学，并且在pH 6、200 rpm搅拌和25°C下表现出〜55 mg / g的Rh B Langmuir吸附容量。该MOF-MBC杂化物的特征在于SEM，TEM，EDS，XRD，FT-IR，TGA，BET，元素分析和XPS。脱乙基和羧酸化合物被鉴定为光降解中间体。静电和π–π堆积相互作用被认为在Rh B吸附中起重要作用。六价铬（Cr ⁶⁺）和Rh B通常并存于制革厂和印刷废水中。的Cr ⁶⁺可以触发的Rh B的光降解成CO ₂和H ₂在两个MIL-53 -铁MOF和MOF-MBC的存在O操作。因此，在实际应用中可以最小化吸附剂汽提再生。生物炭相有助于分散MOF，使颗粒聚集最小化，为MOF提供额外的稳定性，并用作重金属，氧阴离子和有机污染物的次级吸附位点。大的生物炭颗粒允许合理的流量流过柱床，同时支撑其他纳米相，这在单独使用时会引起较大的压降。