Modified walnut wooden shell (MWWS) and almond wooden shell (MAWS) as novel anion exchangers were used to remove phosphorus (P) from aqueous solution. The raw and modified agricultural wastes were characterized using total N, total P, FT-IR spectra, SEM, BET, and EXD analysis. The effect of different parameters such as pH (4 to 8), contact time (5 to 600 min), and adsorbent dosage (1 to 8 g L⁻¹) on P adsorption was investigated. Adsorption of P onto MWWS and MAWS was studied using the batch technique with different concentration of P (5 to 200 mg L⁻¹) at 25 ± 2 °C. The P adsorption isotherms were fitted with the Freundlich and Langmuir equations. The k and n values were 1.57 mg g⁻¹ and 1.88 for MWWS and 1.91 mg g⁻¹ and 2.24 for MAWS, respectively. The maximum P adsorption capacities for MWWS and MAWS were 22.73 and 14.71 mg g⁻¹, respectively. The desorption-regeneration experimental results indicated about 4% and 3% reductions in MWWS and MAWS P adsorption efficiency after four consecutive regeneration cycles, respectively. The data well fitted with Pseudo-second-order kinetic model (R² ≥ 0.99), indicating that chemical interactions dominate the P adsorption process. Incubation studies showed the rate of P release in treated soil with P-loaded modified biosorbents was higher than control. Therefore, the MWWS and MAWS can potentially be used as an excellent adsorbent in remediation of contaminated waters by P and then recycled to soil.

中文翻译：

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使用改良的核桃木和杏仁木壳从水溶液中去除磷，并作为土壤改良剂进行回收。

改性核桃木壳（MWWS）和杏仁木壳（MAWS）作为新型阴离子交换剂用于去除水溶液中的磷（P）。使用总氮，总磷，傅立叶变换红外光谱，SEM，BET和EXD分析对生废和改性农业废物进行表征。研究了pH（4至8），接触时间（5至600 min）和吸附剂用量（1至8 g L ^-1）等不同参数对P吸附的影响。使用分批技术研究了在25±2°C下不同浓度的P（5至200 mg L ^-1）下P在MWWS和MAWS上的吸附。P吸附等温线符合Freundlich和Langmuir方程。的ķ和Ñ值分别为1.57毫克克^-1对于MWWS分别为1.88和1.91mg g ^-1和对于MAWS为2.24。MWWS和MAWS的最大P吸附容量分别为22.73和14.71 mg g ^-1。解吸再生实验结果表明，在连续四个再生周期后，MWWS和MAWS P的吸附效率分别降低了约4％和3％。数据完全符合伪二阶动力学模型（R ² ≥0.99），表明化学相互作用主导着P吸附过程。孵化研究表明，含磷改性生物吸附剂处理过的土壤中磷的释放速率高于对照。因此，MWWS和MAWS可以潜在地用作P污染水的优良吸附剂，然后再循环到土壤中。