Sulfur Copolymerization with Hydrophilic Comonomers as Polysulfides in Microbeads for Highly Efficient Hg2+ Removal from Wastewater,ACS Applied Polymer Materials

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Sulfur Copolymerization with Hydrophilic Comonomers as Polysulfides in Microbeads for Highly Efficient Hg2+ Removal from Wastewater
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-09-02 , DOI: 10.1021/acsapm.0c00725
Lawrence A. Limjuco ₁ , Hiluf T. Fissaha ₁ , Hern Kim ₁ , Grace M. Nisola ₁ , Wook-Jin Chung ₁

Affiliation

Repurposing of sulfur, a petroleum industry byproduct, will not only address safety issues of its storage but also advance its valorization. Herein, sulfur was directly copolymerized with 2-carboxyethyl acrylate (CEA) to synthesize a S-rich hydrophilic polysulfide (pS-CEA) for Hg²⁺ sequestration. Physicochemical properties such as the hydration number and S-content were correlated with the ability of pS-CEAs to capture Hg²⁺ in terms of the binding capacity (q) and site utilization. Results reveal that the S content in pS-CEA must be balanced carefully with its wettability to ensure an efficient Hg²⁺ sequestration. At an optimized S/CEA molar ratio, pS-CEA (6:1) exhibited an extremely high affinity towards Hg²⁺ with a distribution coefficient (K_d ∼ 26 095 mL g^–1). It attained a superior adsorption capacity q_m ∼ 989 mg Hg²⁺ g^–1 derived from the Langmuir isotherm model and followed a pseudo-second-order kinetics. pS-CEA was conveniently configured into microbeads via agar gelation and the drop-in-oil method. At its highest acceptable pS-CEA loading (150 wt %), pS-CEA/agar microbeads attained a q_m = 527 mg g^–1. The microbeads were configured into a packed bed column and successfully filtered out 99.89% Hg²⁺ from atypically high-concentration feeds (C_o = 50 mg L^–1). The filtration column can be easily regenerated by passing a stripping solution (0.5 M HCl/1 M thiourea) with nearly 100% Hg²⁺ elution efficiency. This work demonstrates the effective design and benefits of the developed polysulfide, which can be synthesized from sulfur waste as a functional material for Hg²⁺ pollution remediation.

中文翻译：

与亲水共聚单体作为多硫化物的微珠中的硫共聚，用于高效去除废水中的Hg ²⁺

石油行业副产品硫的再利用，不仅将解决其储存的安全问题，还将促进其增值。在此，将硫与丙烯酸2-羧乙基酯（CEA）直接共聚，以合成用于Hg ²⁺螯合的富含S的亲水性多硫化物（pS-CEA）。就结合能力（q）和位点利用而言，诸如水合数和S含量等理化性质与pS-CEA捕获Hg ²⁺的能力相关。结果表明，必须仔细平衡pS-CEA中的S含量及其润湿性，以确保有效的Hg ²⁺螯合。在优化的S / CEA摩尔比下，pS-CEA（6：1）对Hg ²⁺具有极高的亲和力用分配系数（ķ _d〜26 095毫升克^-1）。它实现一个优良的吸附容量q_米〜989毫克汞²⁺克^-1从Langmuir等温模型导出和随后的伪二阶动力学。pS-CEA通过琼脂凝胶法和油滴法方便地配置为微珠。在其最高可接受的pS-CEA含量（150 wt％）下，pS-CEA /琼脂微珠的q _m = 527 mg g ^–1。将微珠配置为填充床色谱柱，并成功地从非典型高浓度进料（C _o = 50 mg L）中滤出99.89％Hg ²⁺^–1）。通过以近100％Hg ²⁺洗脱效率通过汽提溶液（0.5 M HCl / 1 M硫脲），可以轻松地再生过滤柱。这项工作证明了开发的多硫化物的有效设计和益处，该多硫化物可以由硫废物作为Hg ²⁺污染修复的功能材料合成。

更新日期：2020-09-02

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