Silver is recovered as Ag.sup.0 nanoparticles from the spent solution obtained from the regeneration of an Ag-loaded ion exchange resin using electrolysis. The reclaimed regenerant solution is recycled and reused in a closed-loop scheme over multiple cycles. The recovered Ag.sup.0 nanoparticles are monodisperse, spherical in shape, and have a mean diameter of about 6 nm.

Silver is recovered as Ag.sup.0 nanoparticles from the spent solution obtained from the regeneration of an Ag-loaded ion exchange resin using electrolysis. The reclaimed regenerant solution is recycled and reused in a closed-loop scheme over multiple cycles. The recovered Ag.sup.0 nanoparticles are monodisperse, spherical in shape, and have a mean diameter of about 6 nm.

The present invention discloses a graphene oxide purification method and a graphene oxide. The purification method of graphene oxide includes the following steps: ion exchange purification: sequentially passing a graphene oxide solution through a cation exchange resin and an anion exchange resin. The cation exchange resin is a hydrogen cation exchange resin, and the anion exchange resin is a hydroxide anion exchange resin. The purification method provided by the present invention has the advantages of simple operation and high purification efficiency, and the content of each metal impurity after purification is less than 10 ppm. In addition, the used ion exchange resin can also be reused through regeneration, which is energy-saving and environment-friendly.

A process and apparatus for enhanced boron removal from water. The process includes the steps of reacting potassium carbonate or ammonium carbonate with calcium borate in a stream of feed water to form a stream having calcium carbonate and potassium borate salt or ammonium borate salt. The stream having calcium carbonate and potassium borate or ammonium borate is introduced to an ion exchange vessel containing resin having methylglucamine in salt form with potassium carbonate or sodium carbonate to form borate and potassium sulfate or sodium sulfate. The resin in the ion exchange vessel is periodically regenerated.

A process and apparatus for enhanced boron removal from water. The process includes the steps of reacting potassium carbonate or ammonium carbonate with calcium borate in a stream of feed water to form a stream having calcium carbonate and potassium borate salt or ammonium borate salt. The stream having calcium carbonate and potassium borate or ammonium borate is introduced to an ion exchange vessel containing resin having methylglucamine in salt form with potassium carbonate or sodium carbonate to form borate and potassium sulfate or sodium sulfate. The resin in the ion exchange vessel is periodically regenerated.

The present invention discloses a graphene oxide purification method and a graphene oxide. The purification method of graphene oxide includes the following steps: ion exchange purification: sequentially passing a graphene oxide solution through a cation exchange resin and an anion exchange resin. The cation exchange resin is a hydrogen cation exchange resin, and the anion exchange resin is a hydroxide anion exchange resin. The purification method provided by the present invention has the advantages of simple operation and high purification efficiency, and the content of each metal impurity after purification is less than 10 ppm. In addition, the used ion exchange resin can also be reused through regeneration, which is energy-saving and environment-friendly.

Provided is a method for purifying a nonaqueous liquid in a simple and cost-efficient manner, without requiring a large amount of the nonaqueous liquid, by using an ion exchange resin having a reduced water content. The method for purifying a nonaqueous liquid using an ion exchange resin includes bringing the ion exchange resin into contact with a nonaqueous liquid for pretreatment having a relative permittivity at 25? C. of 20 or higher and bringing the ion exchange resin after the pretreatment into contact with a nonaqueous liquid to be purified, wherein the relative permittivity at 25? C. of the nonaqueous liquid for pretreatment is greater than the relative permittivity at 25? C. of the nonaqueous liquid to be purified, and the concentration of metals to be reduced in the nonaqueous liquid for pretreatment is 5 ?g/L or less.

Provided is a method for purifying a nonaqueous liquid in a simple and cost-efficient manner, without requiring a large amount of the nonaqueous liquid, by using an ion exchange resin having a reduced water content. The method for purifying a nonaqueous liquid using an ion exchange resin includes bringing the ion exchange resin into contact with a nonaqueous liquid for pretreatment having a relative permittivity at 25? C. of 20 or higher and bringing the ion exchange resin after the pretreatment into contact with a nonaqueous liquid to be purified, wherein the relative permittivity at 25? C. of the nonaqueous liquid for pretreatment is greater than the relative permittivity at 25? C. of the nonaqueous liquid to be purified, and the concentration of metals to be reduced in the nonaqueous liquid for pretreatment is 5 ?g/L or less.

The present invention provides methods for cleaning or regenerating a chromatography materiel for reuse. The methods of the invention can be used for cleaning or regenerating chromatography columns for reuse in the large-scale manufacture of multiple polypeptide products.

The present invention provides methods for cleaning or regenerating a chromatography materiel for reuse. The methods of the invention can be used for cleaning or regenerating chromatography columns for reuse in the large-scale manufacture of multiple polypeptide products.