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 o...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.展开更多
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 po...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.展开更多
基金supported by the National Key Research and Development Program of China (2017YFA0206600)the National Natural Science Foundation of China (51673214)the support by State Key Laboratory of Powder Metallurgy at the Central South University
基金This work was financially supported by the National Key R&D Program(2017YFB0308500).
文摘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.
基金National Natural Science Foundation of China(51878422,42177060)Science&Technology Bureau of Chengdu(2017-GH02-00010-HZ)Innovation Spark Project in Sichuan University(2082604401254).
文摘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.
