Advances in Chelating Resins for Adsorption of Heavy Metal Ions

Heavy metal ion pollution in water and soil is a formidable environmental problem. Due to their desired heavy metal capture capacity and excellent chemical and physical stability, resin chelating ligands have been widely used in heavy metal adsorption. In this Review, we outline the latest progress in chelating resin adsorbents toward heavy metals. This paper reviews the methods of selectively separating the target ions in various solutions and screens the excellent performances of chelating resins; the types and synthesis methods of chelating resins are also summarized. Different adsorption mechanisms existing between chelating resins and heavy metal ions are summarized, and the influencing factors of the adsorption processes are analyzed. On this basis, we propose the opportunities, challenges, and prospects faced by researchers studying chelating resin materials in the adsorption of heavy metals, and the reasonable design of advanced chelated resin-based adsorption systems should achieve an eco-friendly and sustainable environment

Differences in Parental Relationship and Hyperactivity-Impulsivity between Addictive and Non-Addictive Internet Users, Middle School Students, 2009, Wuhan, China.

<p><b>Note:</b> The number of addictive users and non-addictive users in each subgroup did not add up to the total sample because of missing data.</p

Interaction of age with parental relationship on Internet Addiction.

<p>In <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061782#pone-0061782-g001" target="_blank">figure 1</a>, the continuous blue line is for 13 and younger, and the dashed red line is for 14 and older.</p

Interaction of hyperactivity-impulsivity with parental relationship on Internet Addiction.

<p>In <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061782#pone-0061782-g002" target="_blank">figure 2</a>, the continuous blue line is for low hyperactivity-impulsivity, and the dashed red line is for high hyperactivity-impulsivity.</p

Factors Associated with Addictive Internet Use among Adolescents in Wuhan, China.

<p><b>Note</b>: here age is a continuous variable. However, age variable in the interaction figure is segment into two.</p

Prevalence of Addictive Internet Use among Adolescents with Access to Internet, 2009, Wuhan, China (N = 1101).

<p><b>Note</b>: <b>^a</b><i>Z</i> = 1.64, <i>p</i><0.05 from Cochran-Armitage Trend Test.</p

Characteristics of the Study Sample.

<p><b>Note:</b> **: p<0.01 from t-test.</p