Synthesis of Modified Starch/Polyvinyl Alcohol Composite for Treating Textile Wastewater

Abstract

In this work, we demonstrated a strategy to design a modified starch/polyvinyl alcohol composite (CCSP), which was employed as a highly efficient and economical fixed-bed adsorbent for treating textile wastewater. Characterization revealed that most of the CCSP was shaped with the morphology of sphericity, and had some water swelling properties. The crystallinity of the CCSP was lower than that of native starch and polyvinyl alcohol, and its average particle size gradually increased with the dosage increase of cationic starch in the preparation. Adsorption experiments showed that the adsorption capacities of CCSP were more than 605 and 539 mg/g for Reactive Black 5 and Reactive Orange 131, respectively, which were over 10 times larger than that of commercial activated carbon (AC). The mixture adsorbent composed of CCSP and AC could remove starch, polyvinyl alcohol, and dyes from textile wastewater completely and simultaneously combined with the fixed-bed technique, and its adsorption capacity was conducted as a function of the bed height and flow rate. Most importantly, the disabled mixture adsorbent could be converted into regenerated AC through a chemical activation process, thereby avoiding the production of solid waste. This study will provide a new efficient green sustainable method for treating textile wastewater.

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

“…The higher q b can be explained by the larger number of active adsorbent sites available to interact with the solute before the solution leaves the column [ 51 ]. This is in accordance with literature reports that larger q b is obtained by increasing the bed height [ 52 , 53 , 54 ].…”

Surface Modification of Attapulgite by Grafting Cationic Polymers for Treating Dye Wastewaters

“…The dye aqueous solutions were set at 500 mg/L, and the adsorbent dosage was 2 g/L. The effects of solution pH (3)(4)(5)(6)(7)(8)(9)(10)(11), salt (NaCl, 1-4 g/L), surfactant (dodecyltrimethylammonium chloride (DTAC), 1 g/L) and temperature (293-333 K) on adsorption were studied. Each sample was shaken for 2 h. The final solutions were determined by a UV-VIS spectrophotometer (Shimadzu, Kyoto, Japan), and their dye concentrations were calculated according to the standard curves.…”

“…Dye wastewater is of increasing concern, due to the negative effects on public health and the environment [ 1 , 2 ]. The adsorption method is the most commonly used decolorization technology in wastewater treatment, and it has the advantages of simple operation, low cost, and excellent removal effects on almost any dye [ 3 , 4 , 5 ]. To date, different types of micro- and mesoporous adsorbents have been reported for removing dyes from aqueous solutions, including activated carbon [ 6 ], minerals [ 7 ], agricultural wastes [ 8 ], ion exchange resins [ 9 , 10 ], and organic/inorganic composites [ 11 ].…”

Polymeric Materials for Water and Wastewater Management

“…This Special Issue on “Polymeric Materials for Water and Wastewater Management”, we believe, succeeded to present such high-quality works and topics focusing on the latest novel wastewater processes using polymeric materials. This Special Issue consists of 11 works (9 research articles, 1 review paper, and 1 teaching note) from distinguished authors worldwide [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ].…”

“…A specific focus of that article was placed on introducing and comparing the water purification performances of different classes of polymeric and ceramic membranes in related water-treatment industries. A technical report by Xia et al demonstrated a strategy to design a modified starch/polyvinyl alcohol composite (CCSP) which was employed as a highly efficient and economical fixed-bed adsorbent for treating textile wastewater [ 9 ].…”