Abstract To improve oil recovery from oilfield wells mineral scales derived by insoluble BaSO4 and SrSO4 salts during oil extraction should be diminished. In this work, adsorption selectivity of Barium (Ba2+) and Strontium (Sr2+) ions associated with saline formation waters was examined for the first time using nano-sized bi-functional polymer blend synthesized by Cobalt-60 (60Co) γ-rays, as green technology. A bifunctional polymer formed from poly(acrylonitrile)/(styrene-butadiene rubber) homogenous blend is functionalized by -SO3H and -COOH terminal groups (termed as SASB). Those functional groups were selected based on systematic calcium (Ca2+) ions adsorption studies of carboxylate containing molecules. Main and binary interactive effects of solution pH (3–9), adsorbents dose (1-3 g/L), total dissolved salts (TDS, up to 30 g/L), initial Ba2+ and Sr2+ concentrations (10-500 mg/L) and temperature (20–50 oC) on the adsorption selectivity were examined and optimized using Plackett-Burman factorial design (PBD) combined with multiple regression analysis. The regression statistics revealed the significance of quadratic polynomial model to optimize interactive sorption conditions from salty waters with high accuracy level ( R 2 ≈ 0.99) rather than linear and two-way interactive models at 95% confidence level. Interestingly finding, the regression and experimental data proved that the presence of up to 10 g/L TDS from alkali metal ions had a significant effect on the enhancement sorption capacity of Ba2+ and Sr2+ when using the prepared sorbent. The SASB adsorbent showed higher sorption selectivity with maximum equilibrium capacity ( q mg / g ) of 175.3 mg Ba+2 and 210.5 mg Sr+2 per each gram sorbent used in kinetic study. Adsorption kinetics of Ba2+ and Sr2+ sorption by both adsorbents obey pseudo-first and pseudo-second order kinetics, respectively. In sum, the adsorptive power of SASB sorbent is found to be in reverse order of the electronegativity and the hydration radii of the metal ions.

中文翻译：

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使用伽马辐射的定制功能化聚合物纳米颗粒选择性吸附油田废水中的钡和锶

摘要 为了提高油田井的采油率，应减少采油过程中由不溶性 BaSO4 和 SrSO4 盐产生的矿物垢。在这项工作中，首次使用由 Cobalt-60 (60Co) γ 射线合成的纳米级双功能聚合物共混物检测了与含盐地层水相关的钡 (Ba2+) 和锶 (Sr2+) 离子的吸附选择性，如绿色技术。由聚（丙烯腈）/（苯乙烯-丁二烯橡胶）均质共混物形成的双官能聚合物通过 -SO3H 和 -COOH 端基（称为 SASB）进行功能化。这些官能团是基于对含羧酸盐分子的系统钙 (Ca 2+ ) 离子吸附研究来选择的。溶液 pH (3-9)、吸附剂剂量 (1-3 g/L)、总溶解盐 (TDS，高达 30 g/L)、使用 Plackett-Burman 因子设计 (PBD) 结合多元回归分析检查和优化初始 Ba2+ 和 Sr2+ 浓度 (10-500 mg/L) 和温度 (20-50 oC) 对吸附选择性的影响。回归统计揭示了二次多项式模型以高精度水平（R 2 ≈ 0.99）优化咸水交互吸附条件的重要性，而不是在 95% 置信水平下的线性和双向交互模型。有趣的是，回归和实验数据证明，当使用制备的吸附剂时，碱金属离子中高达 10 g/L 的 TDS 对 Ba2+ 和 Sr2+ 的吸附能力增强有显着影响。SASB 吸附剂显示出更高的吸附选择性，最大平衡容量 (q mg/g) 为 175.3 mg Ba+2 和 210。5 mg Sr+2 每克用于动力学研究的吸附剂。两种吸附剂对 Ba2+ 和 Sr2+ 的吸附动力学分别服从伪一级和伪二级动力学。总之，SASB 吸附剂的吸附能力与金属离子的电负性和水合半径成反比。