Argan nutshells, available in Morocco as a low-cost by-product from Argan oil production, were used to produce a sawdust biosorbent for the extraction of U and other heavy metals (Cd, As, Zn, Cu, Ni and Cr) from merchant-grade phosphoric acid (PA). Packed column (D = 20 mm, L = 250 mm, flowrate 1 mL/min) lab-scale experiments were carried out with three different solutions: (1) a synthetic heavy metals solution, (2) pure PA at different concentrations (0.85%, 8.5% and 85%) in water, and (3) merchant-grade PA from an industrial fertilizer plant in Morocco that was diluted with water to analyze different P₂O₅ contents (5%, 30% and 54%) and a U concentration of up to 157 ppm. The sawdust successfully adsorbed 99% of the U from (1) the synthetic solution and (2) the pure PA independent of the acid concentration. It further managed to adsorb more than half (54%) of U, 75% of Cd, 74% of As, 84% of Zn, 86% of Cu, 83% of Cr of the merchant-grade PA at 54% P₂O₅ content and a flow-rate of 1 mL/min. The sawdust was characterized by SEM and FTIR to understand the adsorption of metal ions. Column studies were carried out to know the breakthrough point. At breakthrough, the effluent volume was found to be 50 mL and the maximum adsorption capacity for U was found to be 0.93 mg/g. Heavy metal recovery using ANS does not seem to be promising as a result of the low (>10%) desorption rates if citric- or oxalic acid is used as was done in this study. Heavy metal extraction without direct recovery using ANS is promising and should further be investigated though.

摩洛哥坚果壳是摩洛哥坚果油生产的低成本副产品，可用于生产锯末生物吸附剂，用于从商人处提取 U 和其他重金属（Cd、As、Zn、Cu、Ni 和 Cr）级磷酸 (PA)。填充柱（D = 20 mm，L = 250 mm，流速 1 mL/min）实验室规模实验使用三种不同的溶液进行：(1) 合成重金属溶液，(2) 不同浓度 (0.85 %、8.5% 和 85%）在水中，以及 (3) 来自摩洛哥工业化肥厂的商业级 PA，用水稀释以分析不同的 P ₂ O ₅含量（5%、30% 和 54%）和高达 157 ppm 的 U 浓度。锯屑成功地从 (1) 合成溶液和 (2) 纯 PA 中吸附了 99% 的 U，与酸浓度无关。它进一步成功地吸附了商业级 PA 中超过一半 (54%) 的 U、75% 的 Cd、74% 的 As、84% 的 Zn、86% 的 Cu、83% 的 Cr，54% P ₂氧₅含量和流速为 1 mL/min。锯末通过SEM和FTIR表征以了解金属离子的吸附。进行柱研究以了解突破点。突破时，流出物体积为 50 mL，U 的最大吸附容量为 0.93 mg/g。如果像本研究中那样使用柠檬酸或草酸，则使用 ANS 回收重金属似乎没有希望，因为解吸率低 (>10%)。不使用 ANS 直接回收的重金属提取是有前途的，但应进一步研究。