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Mg/Al-layered double hydroxide modified biochar for simultaneous removal phosphate and nitrate from aqueous solution
Environmental Technology & Innovation ( IF 6.7 ) Pub Date : 2021-07-05 , DOI: 10.1016/j.eti.2021.101771
Shuqi Li 1, 2 , Xiaolong Ma 1, 3 , Zichuan Ma 1, 2 , Xutong Dong 1, 2 , Ziye Wei 2 , Xinyu Liu 2 , Longpan zhu 2
Affiliation  

To enhance the removal of phosphate and nitrate nutrients in wastewater with hard biochar, a two-step wet impregnation method was used to prepare a series of modified almond shell biochar (ASB) having different atomic ratios (x) of Mg/Al hydroxides (ASB-x). Several techniques (XRD, SEM/EDS, FTIR and N2 adsorption/desorption) were used to characterize the structure and adsorption behavior of the adsorbents. The results showed that both Mg/Al hydroxides were successfully introduced onto the surface of ASB in the form of the low crystallinity Mg/Al-layered double hydroxide structure. Optimum adsorption rates for phosphate (47.5%) and nitrate (27.7%) were attained when x was equal to three (ASB-3). The specific surface area (4.51 m2 g−1) and total pore volume (0.023 cm 3 g−1) of ASB-3 were greater than those of ASB (2.18 m2 g−1, 0.012 cm 3 g−1). Adsorption kinetics and isotherm studies also showed that ASB-3 had an improved rate of adsorption, affinity and capacity for phosphate and nitrate. ASB-3 may provide a potential alternative to carbon-based adsorbents for the removal of phosphates and nitrates from aqueous solutions.



中文翻译:

镁/铝层状双氢氧化物改性生物炭同时去除水溶液中的磷酸盐和硝酸盐

为提高含硬生物炭对废水中磷酸盐和硝酸盐营养物质的去除,采用两步湿法浸渍法制备了一系列具有不同原子比 (x) Mg/Al 氢氧化物 (ASB) 的改性杏仁壳生物炭 (ASB)。 -X)。多种技术(XRD、SEM/EDS、FTIR 和N2吸附/解吸)用于表征吸附剂的结构和吸附行为。结果表明,两种 Mg/Al 氢氧化物均以低结晶度 Mg/Al 层状双氢氧化物结构的形式成功引入 ASB 表面。当 x 等于 3 (ASB-3) 时,磷酸盐 (47.5%) 和硝酸盐 (27.7%) 的最佳吸附率达到。比表面积 (4.51 m 2g -1 ) 和总孔体积 (0.023 cm 3g -1 ) ASB-3 大于 ASB (2.18 m 2g -1 , 0.012 cm 3g -1 )。吸附动力学和等温线研究还表明,ASB-3 对磷酸盐和硝酸盐的吸附速率、亲和力和容量均有所提高。ASB-3 可作为碳基吸附剂的潜在替代品,用于从水溶液中去除磷酸盐和硝酸盐。

更新日期:2021-07-05
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