Zhang Haibo, Su Long, Cheng Caiping, Cheng Hongyan, Chang Mingchang, Liu Fenwu, Liu Na, Oh Kokyo
College of Resources and Environment, Shanxi Agricultural University, Taigu, China.
State Key Laboratory of Sustainable Dryland Agriculture (in preparation), Shanxi Agricultural University, Shanxi, Taiyuan, China.
Front Bioeng Biotechnol. 2022 Sep 20;10:1007630. doi: 10.3389/fbioe.2022.1007630. eCollection 2022.
Adsorption is commonly accepted as a most promising strategy in dye wastewater treatment, and the widespread use of adsorption emphasizes the need to explore low-cost but excellent adsorbents. Herein, a low-cost adsorbent (calcium-rich biochar) was developed, which was directly pyrolyzed from spent mushroom substate without any modification. This study evaluated the potential application of two calcium-rich biochars (GSBC and LSBC) derived from spent substrates of and , respectively. The effects of pyrolysis temperature on the calcium-rich biochars characteristics and their adsorption mechanism for cationic dyes (Malachite Green oxalate (MG) and Safranine T (ST)) were studied systematically. The increase in pyrolysis temperature from 350 to 750 °C led to an increase in both biochar ash, Ca content, and specific surface area, which made high-temperature biochars (GS750 and LS750) the superior adsorbents for cationic dyes. Batch adsorption results showed LS750 was more efficient to adsorb dyes than GS750 attributed to its higher Ca content and larger specific surface area. According to the Langmuir model, LS750 had high adsorption capacities of 9,388.04 and 3,871.48 mg g for Malachite green and ST, respectively. The adsorption mechanism of dye MG could be attributed to pore filling, hydrogen bonding, electrostatic interaction, ion exchange, and π-π stacking, while ST adsorption mainly involved pore filling, electrostatic interaction, ion exchange, and π-π stacking. Attributed to their excellent adsorption performance, cheap source, and good reusability, biochars obtained from SMSs were very promising in dyeing wastewater treatment.
吸附被公认为是处理染料废水最具前景的策略，吸附法的广泛应用凸显了探索低成本但性能优异的吸附剂的必要性。在此，开发了一种低成本吸附剂（富钙生物炭），它是由废弃蘑菇渣直接热解而成，无需任何改性。本研究评估了分别由 和 的废弃底物衍生的两种富钙生物炭（GSBC和LSBC）的潜在应用。系统研究了热解温度对富钙生物炭特性及其对阳离子染料（草酸孔雀石绿（MG）和番红花红T（ST））吸附机制的影响。热解温度从350℃升高到750℃导致生物炭灰分、钙含量和比表面积均增加，这使得高温生物炭（GS750和LS750）成为阳离子染料的优质吸附剂。批量吸附结果表明，LS750比GS750对染料的吸附效率更高，这归因于其更高的钙含量和更大的比表面积。根据朗缪尔模型，LS750对孔雀石绿和ST的吸附容量分别高达9388.04和3871.48 mg/g。染料MG的吸附机制可归因于孔隙填充、氢键、静电相互作用、离子交换和π-π堆积，而ST的吸附主要涉及孔隙填充、静电相互作用、离子交换和π-π堆积。由于其优异的吸附性能、廉价的来源和良好的可重复使用性，从废弃蘑菇渣中获得的生物炭在印染废水处理中极具前景。
