Tannery wastewater treatment:conventional and promising processes,an updated 20-year review

Mismanagement of various wastes especially waste water produced by tanning processes has caused serious environmental problems and ultimately impaired human health.Constant efforts have been making to alleviate the pollution of tannery wastewater(TWW),yet terminal treatment still takes dominance.In this review,research onTWW treatment from 2000 to 2021 was summarized,and main methods such as coagulation and flocculation,adsorption,biological treatment,membrane filtration,advanced oxidation process were briefly discussed.More detailed introduction was given to the method of electrochemical treatment since it has excellent performance such as environmental friendliness and high efficiency,hence attracting more and more research attention in recent years.In view of the harsh physi-chemical conditions of TWW,integrated or combined treatment methods are accordingly recommended with better performance and multi-function,however comprehensive studies on optimization of methods combination and cost-effectiveness are needed.The certain issues that the residue Cr in treatment sludge and high salinity in effluent still remain were put forward in this work and potential solutions were provided.Moreover,this review proposed the perspective that realizing multi-function,recycling,and intensification should be the developing direction for future TWW treatment.This review is expected to provide a general guide for researchers who aspire to ameliorate TWW pollution problems and understand various methods utilized in this field.

Solution-processed ultra-flexible C8-BTBT organic thin-film transistors with the corrected mobility over 18 cm^2/(V s)

Organic thin film transistors(OTFTs)show great potential for applications in low-cost,light-weight flexible electronics.OTFTs were first reported in 1986 with polythiophene as the active layer material with a mobility of^105 cm2/(V s)[1].Since then,OTFTs have shown impressive improvements in device performance parameters,e.g.,mobility improved by over 4 orders of magnitude.These advances followed discoveries of new materials and improvements in device engineering,as well as in morphology and interface engineering[2–4].Flexible OTFTs(f-OTFTs)as a very important electronic component in flexible electronics are attracting a great deal of attention from both academic and industrial communities.Presently,f-OTFTs are potentially used for electronic skin[5],flexible organic integrated circuits[6],flexible active matrix displays[7]and neuromorphic devices[8].

Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing

Dialdehyde sodium alginate(DSA)is an alternative chrome-free tanning material for fur production.To obtain satisfactory resultant fur and provide suggestions for the usage of DSA in fur making,the general properties of DSA tanned sheep fur were systematically investigated.The tanning mechanism of DSA was analyzed and it was verified that DSA was mainly combined with collagen fiber by forming Schiff base covalent bonds while supplemented by a small number of hydrogen bonds and ionic bonds.Due to the acid sensitivity of Schiff base structure,DSA tanned fur had poor resistance to acid rinsing but had excellent resistance to washing and good fatliquoring performance.Also,it had good resistances to yellowing and reductant.After being retanned by chrome tanning agent,the fur was capable of enduring a high-temperature dyeing process(68°C for 8 h).Overall,DSA tanned sheep fur had favorable properties under appropriate post-tanning processing conditions to manufacture light-colored or dark-colored fur products with desirable physical properties.

Tannery wastewater treatment:conventional and promising processes,an updated 20-year review

Mismanagement of various wastes especially waste water produced by tanning processes has caused serious environmental problems and ultimately impaired human health.Constant efforts have been making to alleviate the pollution of tannery wastewater(TWW),yet terminal treatment still takes dominance.In this review,research on TWW treatment from 2000 to 2021 was summarized,and main methods such as coagulation and flocculation,adsorption,biological treatment,membrane filtration,advanced oxidation process were briefly discussed.More detailed introduc-tion was given to the method of electrochemical treatment since it has excellent performance such as environmental friendliness and high efficiency,hence attracting more and more research attention in recent years.In view of the harsh physi-chemical conditions of TWW,integrated or combined treatment methods are accordingly recommended with better performance and multi-function,however comprehensive studies on optimization of methods combina-tion and cost-effectiveness are needed.The certain issues that the residue Cr in treatment sludge and high salinity in effluent still remain were put forward in this work and potential solutions were provided.Moreover,this review pro-posed the perspective that realizing multi-function,recycling,and intensification should be the developing direction for future TWW treatment.This review is expected to provide a general guide for researchers who aspire to ameliorate TWW pollution problems and understand various methods utilized in this field.