The invention discloses a preparation method of modified nano
cellulose bentonite composite material for treatment of printing and
dyeing wastewater. The preparation method comprises the steps of: firstly extracting
cellulose of
sunflower seed
hull by using an acid-extraction alkali-extraction process, and modifying
bentonite by using
polyacrylamide, so as to enable a part of
polyacrylamide intercalated structure to be embedded into sheet
layers of
bentonite, and further to provide more sites and surface pores, improve the adsorption performance and later progress of a
grafting reaction. According to the invention,
cellulose is dispersed in
urea, then modification of
ammonium persulfate and
polyacrylamide-modified bentonite is carried out, thus reaction of cellulose chains is initiated bythe
ammonium persulfate, hydroxyl on the cellulose chains after reaction
initiation is grafted to polyacrylamide, and after
grafting polymerization for a certain period of time,
amide groups are successfully introduced, so that the
composite material with dual effects of adsorption and
flocculation is obtained. For treatment of printing and
dyeing wastewater, the
composite material still maintainsexcellent
flocculation performance while has improved decoloring performance, has excellent effect on actual comprehensive treatment of printing and
dyeing wastewater, and is worthy of promotion.