Dynamic experiment on the treatment of acidic chromium-containing wastewater by lignite loaded nano FeS

Abstract

Based on the good adsorption and reducibility of Cr(vi) of lignite and nano-FeS, the lignite supported nano-FeS adsorption material (nFeS-lignite) was prepared by ultrasonic precipitation method to treat acidic chromium-containing wastewater.

Research on extraction of Cr(III) by D2EHPA/n‐octanol/sulphonated kerosene

“…There are many methods to treat chromium‐containing wastewater, including chemical (electrochemical) reduction precipitation, such as electrochemical removal of chromium from wastewater by using carbon aerogel electrodes [ 18 ] ; ion exchange, such as using magnetic ion exchange resin to remove Cr(VI) [ 19 ] ; membrane separation, such as ultrafiltration after polyethyleneimine (PEI) combined with Cr(III) [ 20 ] and using analcime‐C zeolite composite membrane to remove Cr(VI) [ 21 ] ; adsorption, such as using solid bisphosphonates (BPs) [ 22 ] , gallic acid‐conjugated magnetite nanoparticles, [ 23 ] and magnetically‐separable Fe 3 O 4 nanoparticle surface grafted with polyacrylic acid [ 24 ] to absorp Cr(III); using lignite loaded nano FeS to absorb Cr(VI) [ 25 ] ; solvent extraction; and so on. The precipitation method is widely used with low cost, but it is easy to cause hazardous waste pollution, while chromium resources are not easy to recycle; the ion exchange method needs to completely remove suspended solids and strictly monitor ion concentration, which is difficult to operate; membrane separation can remove high concentration Cr(VI), but the cost is high; the treatment efficiency of the adsorption method is low.…”