Abstract This study aims to investigate the removal of Cl- from acidic solution with antimony oxides. The effects of the adsorbent type, reaction time, reaction temperature, Sb/Cl mole ratio and acidity on adsorption performance and the regeneration of loaded adsorbent were systematically studied. The results shows that Sb2O3·xH2O has the highest adsorption rate (97.64%) among Sb2O3·xH2O, Sb2O5·xH2O, Sb2O4·xH2O and Sb2O3 in the solution containing 1.25 mol/L H2SO4 under the condition of Sb/Cl mole ratio 3:1 and stirring for 2 h at room temperature, and the concentration of Cl- in the acid solution can be reduced to 280 mg/L. Then the residual Sb in the adsorbed solution can be decreased from 48.21 mg/L to 16.09 mg/L by C-SbA which is made by Sb2O5·xH2O. The C-SbA which has been used can be reused after calcining at 400 ℃ for 2 h. The loaded adsorbent was completely regenerated by adding it into NaOH or Na2CO3 solution whose pH is equal or more than 9.5 according to S/L ratio 1:6 g/mL and was stirred for 0.5 h at room temperature. The Cl- in the regenerated solution was crystallized and precipitated in the form of NaCl without evaporation and concentration according to the common ion effect of Na+, and the purity of NaCl was more than 99%.

中文翻译：

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用氧化锑去除酸性溶液中的氯离子

摘要 本研究旨在研究用氧化锑从酸性溶液中去除Cl-。系统研究了吸附剂类型、反应时间、反应温度、Sb/Cl摩尔比和酸度对吸附性能和负载吸附剂再生的影响。结果表明，在Sb/Cl摩尔比为3的条件下，Sb2O3·xH2O在Sb2O3·xH2O、Sb2O5·xH2O、Sb2O4·xH2O和Sb2O3中，在含有1.25 mol/L H2SO4的溶液中吸附率最高（97.64%）： 1、室温搅拌2h，酸溶液中Cl-浓度可降至280mg/L。Sb2O5·xH2O制备的C-SbA可将吸附溶液中残留的Sb从48.21mg/L降低到16.09mg/L。用过的C-SbA在400℃煅烧2h后可重复使用。将负载的吸附剂按 S/L 比 1:6 g/mL 添加到 pH 等于或大于 9.5 的 NaOH 或 Na2CO3 溶液中，并在室温下搅拌 0.5 小时，从而完全再生。再生液中的Cl-根据Na+的共离子效应，以NaCl形式结晶沉淀，无需蒸发浓缩，NaCl纯度达99%以上。