The potential of forward osmosis for water treatment can only be maximized with suitable draw solutes. Here a three-dimensional, multicharge draw solute of decasodium phytate (Na₁₀-phytate) is designed and synthesized for removing organic arsenicals from water using a hybrid forward osmosis (FO) – membrane distillation (MD) process. Efficient water recovery is achieved using Na₁₀-phytate as a draw solute with a water flux of 20.0 LMH and negligible reverse solute diffusion when 1000 ppm organic arsenicals as the feed and operated under ambient conditions with FO mode. At 50 °C, the novel draw solute increases water flux by more than 30% with water fluxes higher than 26.0 LMH on the FO side, drastically enhancing water recovery efficiency. By combining the FO and MD processes into a single hybrid process, a 100% recovery of Na₁₀-phytate draw solute was achieved. Crucially, organic arsenicals or Na₁₀-phytate draw solutes are both rejected 100% and not detected in the permeate of the hybrid process. The complete rejection of both organic arsenicals and draw solutes using hybrid membrane processes is unprecedented; creating a new application for membrane separations.

中文翻译：

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一种新型的多电荷汲取溶质，可通过混合膜工艺从水中去除有机砷。

只有使用合适的抽取溶质，才能最大限度地发挥正渗透作用在水处理中的潜力。在这里，设计并合成了三水合植酸_十钠植酸钠（Na _10-植酸）溶质，使用正向渗透混合（FO）–膜蒸馏（MD）工艺从水中去除有机砷。使用Na ₁₀可以实现有效的水回收植酸盐作为抽提溶质，水通量为20.0 LMH，当以1000 ppm有机砷作为进料并在环境条件下以FO模式运行时，溶质的反向扩散可忽略不计。在50°C时，新型吸取溶质将水通量增加了30％以上，而FO侧的水通量高于26.0 LMH，极大地提高了水的回收效率。通过将FO和MD工艺组合到单个混合工艺中，可以实现100％Na ₁₀植酸抽提溶质的回收。至关重要的是，有机砷或Na ₁₀-植酸盐汲取溶质均被100％拒绝，并且在混合过程的渗透液中未检测到。使用混合膜工艺完全排除有机砷和抽提溶质是史无前例的。创造了膜分离的新应用。