Adsorption properties of cellulose/guar gum/biochar composite hydrogel for Cu, Co and methylene blue.

Herein, Typha angustifolia was used as a charcoal source and chemically modified with a strong oxidizing agent, potassium permanganate (KMnO), to obtain modified Typha angustifolia (MTC). Then, the green, stable and efficient CMC/GG/MTC composite hydrogel was successfully prepared by compounding MTC with carboxymethyl cellulose (CMC) and guar gum (GG) by free radical polymerization. Various variables that influence adsorption performance were explored, and optimal adsorption conditions were determined.

Preparation of modified reed carbon composite hydrogels for trapping Cu, Ni and methylene blue in aqueous solutions.

The pollution of heavy metal ions and organic dyes seriously endangers human health and causes acute environmental problems. The adsorption method is extensively adopted in the treatment of water pollution which is more harmful to human health. In this work, the original reed carbon (ORC) was functionalized by polyethyleneimine (PEI).

Chitosan-based composite microspheres for treatment of hexavalent chromium and EBBR from aqueous solution.

Hexavalent chromium is widely used in industrial fields, but its pollution has posed a great threat to the environment due to its high toxicity. We created a chitosan-based microsphere biosorbent (CP) by combining polyethyleneimine with chitosan adopting inverse emulsion polymerization method. Under the optimal conditions (pH = 3), the maximum adsorption capacity of composite microspheres can reach 299.

Functionalized cotton charcoal/chitosan biomass-based hydrogel for capturing Pb, Cu and MB.

In this work, a porous multi-functional biomass carbon was prepared by acid-base modification method, which realized the reuse of waste cotton material. Then, the modified biochar was combined with the acrylic-based hydrogel by radical polymerization, and the biochar acrylic-based hydrogel (CS/EDTA/CBC) composite with chitosan and ethylenediamine tetraacetic acid was successfully prepared. This not only increases the adsorption performance of the adsorbent but also improves the stability of hydrogel.